Yearly & Monthly weather

The climate of Ketchikan
The best time to visit Ketchikan
The worst time to visit Ketchikan
Spring weather in Ketchikan
Summer weather in Ketchikan
Autumn weather in Ketchikan
Winter weather in Ketchikan
Weather in January
Weather in February
Weather in March
Weather in April
Weather in May
Weather in June
Weather in July
Weather in August
Weather in September
Weather in October
Weather in November
Weather in December
Frequently asked questions
Average temperature
Average pressure
Average wind speed
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Beautiful and colorful houses along the waterfront boardwalk on Creek Street in Ketchikan, Alaska

The climate of Ketchikan

Situated in the southeastern "Panhandle" region of Alaska, USA, Ketchikan experiences a Marine West Coast climate, formally identified as Cfb under the Köppen climate classification system. This type of climate is typified by a lack of extreme temperatures and a significant amount of rainfall over the course of the year.

Throughout the year, Ketchikan's weather is influenced by a wide array of climatological parameters. Temperature fluctuates modestly, ranging from an average low of 30.6°F (-0.8°C) in February to an average high of 60.8°F (16°C) from July to August. The sea temperatures, likewise, stay relatively cool all year, varying from 42.5°F (5.8°C) in March to a high of 55.9°F (13.3°C) in August.

Rainfall is a predominant condition in Ketchikan's weather, with rainy days ranging from a minimum of 14.2 in February to a maximum of 21.4 in November. The city records the highest rainfall in December with 8.7" (221mm), while the driest period is usually in May, recording an average of 3.46" (88mm).

Further, with snowfall ranging from zero inches between May and October to a peak of 13.11" (333mm) in February, Ketchikan experiences a visible shift in its weather conditions. Additionally, the city highlights varying wind speeds that range from a minimum average of 5.3mph (8.5km/h) to a maximum average of 8.7mph (14km/h).

The best time to visit Ketchikan

The most pleasant time to visit Ketchikan typically aligns with the summer months, particularly from June through August. During this period, visitors can enjoy the warmest average temperatures, ranging from 53.4°F (11.9°C) to 60.8°F (16°C), along with the year's highest sea temperatures, which fall between 53°F (11.7°C) and 55.9°F (13.3°C). The summer also witnesses increased daylight hours, reaching up to 17.4 hours in June. Despite higher rainfall compared to spring, with averages between 4.33" (110mm) and 7.01" (178mm), the higher temperatures and extended daylight hours provide ideal conditions for outdoor activities.

The worst time to visit Ketchikan

It is least recommended to visit Ketchikan during the winter months, specifically from December through February, owing to lower average temperatures ranging from 31.6°F (-0.2°C) to 37°F (2.8°C). During these months, the city also experiences less daylight, with an average of just 7.2 to 9.7 hours per day. The substantial snowfall, especially in February with an average of 13.11" (333mm), and high rainfall averaging between 5.94" (151mm) to 9.69" (246mm), might limit outdoor activities and sightseeing experiences.

Spring weather in Ketchikan

Following the winter chill, Ketchikan embraces spring from March to May, with temperatures climbing steadily from an average low of 32.4°F (0.2°C) in March to an average high of 53.4°F (11.9°C) by May. Rainfall averages decrease from 6.22" (158mm) in March to 3.46" (88mm) in May, marking this as the driest month of the year for the city. Adding to the charm for visitors, the sunshine hours also see a significant uptick, from 4.7 hours in March to 7.2 hours in May.

Summer weather in Ketchikan

As mentioned before, Ketchikan's summer, spanning June through August, is characterized by peak average temperatures, increasing daylight hours, and higher sea temperatures. Despite the possibility of rainfall, the summer gives visitors ample opportunities to engage in outdoor explorations and experience the city’s natural splendor.

Autumn weather in Ketchikan

From September to November, Ketchikan experiences autumn with a gradual drop in temperatures, from an average high of 56.3°F (13.5°C) in September to an average of 35.8°F (2.1°C) by the end of November. The city’s rainfall follows an upward trajectory, peaking at 8.86" (225mm) in November. While daylight hours and sunshine hours decrease throughout the season, autumn's natural display nonetheless adds a special charm to this Alaskan town.

Winter weather in Ketchikan

Winter in Ketchikan, stretching from December through February, is largely characterized by the year's lowest temperatures and shortened daylight hours. Along with higher rainfall and substantial snowfall, these conditions collectively indicate a period which is less inviting for tourism, yet it brings a distinct tranquility and a striking winter beauty to the Alaskan landscape.

Weather in January

In Ketchikan, Alaska, January's weather is marked by a predominance of wet conditions and a chill in the air. Average temperatures range from 31.6°F (-0.2°C) to 36.5°F (2.5°C) this month, noticeably lower than the eminently impending spring months. Weather in January »

Weather in February

In Ketchikan, the weather plummets further in February, with averages spanning from 30.6°F (-0.8°C) minimum to 37°F (2.8°C) maximum. Despite the slight fall in temperature compared to January, the presence of snow increases, accumulating approximately of 13.11" (333mm). Weather in February »

Weather in March

As Ketchikan transitions towards spring in March, a perceptible alteration in weather conditions begins to unfold. The city records temperatures fluctuating from 32.4°F (0.2°C) to 40.3°F (4.6°C). There is substantial reduction in snowfall this month, with a total of 11.81" (300mm), indicating an imminent end to winter. Weather in March »

Weather in April

In April, Ketchikan begins to experience a taste of spring, with warmer temperatures and longer daylight hours. Average temperatures remain within 37.2°F (2.9°C) on the cooler side and ascend to 46°F (7.8°C). Interestingly, snowfall sharply decreases to approximately 1.1" (28mm), marking the conclusion of the prominent snow season. Weather in April »

Weather in May

May in Ketchikan is characterized by pleasanter temperatures and the manifestation of spring in its full glory. The range of temperatures expands, from 43.5°F (6.4°C) to 53.4°F (11.9°C), instilling warmth in the air. Traces of snowfall, recorded at 0.08" (2mm), indicate the vanishing remnants of winter. Weather in May »

Weather in June

Ketchikan in June experiences a noticeable transition from spring to summer. With temperatures spanning from 47.3°F (8.5°C) at the lower end of the spectrum to 56.7°F (13.7°C) at the high, the weather is moderately warm. The absence of snowfall signifies the final departure of the winter chill. Weather in June »

Weather in July

July is relatively the warmest month in Ketchikan, bringing with it a distinct summer vibe. This month witnesses the highest average temperatures in the year, hovering from 51.4°F (10.8°C) to 60.8°F (16°C). Although rainfall in July slightly increases to 4.33" (110mm), there is a distinct lack of snow. Weather in July »

Weather in August

August in Ketchikan maintains the summer spirit, with temperatures identical to July, fluctuating between 52°F (11.1°C) and 60.8°F (16°C). Despite rainfall becoming considerably heavier, 7.01" (178mm) compared to July, the warmth persists. Weather in August »

Weather in September

The weather in Ketchikan, during September, undergoes a slow transition towards fall. Average temperatures take a slight dip compared to August, ranging from 48.7°F (9.3°C) to 56.3°F (13.5°C). With the rainfall clocking 6.85" (174mm), the city starts to experience frequent showers. Weather in September »

Weather in October

October in Ketchikan ushers in the fall season with cooler temperatures, frequent rain, and shorter days. Reading from 42.1°F (5.6°C) at the lower edge to 48.2°F (9°C) upper end, temperatures signify incoming wintry chills. Weather in October »

Weather in November

Ketchikan in November presents a shift towards cold weather. Fluctuating within the lower bracket from 36.1°F (2.3°C) to the 40.8°F (4.9°C) mark, the temperatures suggest the imminent arrival of winter. The city begins to get a dusting of snow accounting for roughly 3.9" (99mm), heralding the upcoming snowy season. Weather in November »

Weather in December

The city of Ketchikan, in December, is entirely in the grip of winter. A sharp drop in temperatures from 35.8°F (2.1°C) to the cold 31.5°F (-0.3°C), coupled with snowfall of about 8.03" (204mm), confirms winter's dominion. Weather in December »

Updated: Aug 3, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the most humid month?

With an average relative humidity of 88%, January is the most humid month.

What is the rainiest month?

The month with the most rainfall in Ketchikan is January, when the rain falls for 19.2 days and typically aggregates up to 9.69" (246mm) of precipitation.

How much does it rain?

In Ketchikan, during the entire year, the rain falls for 221.8 days and collects up to 80" (2032mm) of precipitation.

When does it snow?

January through May, November and December are months with snowfall.

How much does it snow?

Throughout the year, there are 40.7 snowfall days, and 48.35" (1228mm) of snow is accumulated.

What is the month with the least sunshine?

The month with the least sunshine is January, with an average of 3h of sunshine.

What is the month with the lowest UV index?

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the snowiest month?

February is the month with the most snowfall. Snow falls for 8 days and accumulates 13.11" (333mm) of snow.

What month is the ocean coldest?

With an average ocean temperature of 42.4°F (5.8°C), March is the month with the coldest seawater.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from AKST to AKDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from AKDT to AKST.

What is the least humid month?

With an average relative humidity of 82%, May is the least humid month.

What is the driest month?

The month with the least rainfall is May, when the rain falls for 17.1 days and typically collects 3.46" (88mm) of precipitation.

What month has the most sunshine in Ketchikan?

The month with the most sunshine is May, with an average of 7.2h of sunshine.

When it does not snow?

June through October are months without snowfall.

When are the longest days?

June has the longest days of the year, with an average of 17h and 24min of daylight.

What part of the year is the hottest?

During July and August, Ketchikan experiences its average highest temperatures, peaking at 60.8°F (16°C).

What is the month with the highest UV index?

July and August, with an average maximum UV index of 4, are months with the highest UV index.

What is the month with the warmest ocean?

August is the month with the warmest seawater, with an average ocean temperature of 55.9°F (13.3°C).

What month is the coldest?

December is the coldest month of the year, registering average temperatures as high as 35.8°F (2.1°C) and as low as 31.5°F (-0.3°C).

What is the month with the shortest days?

With an average of 7h and 12min of daylight, December has the shortest days of the year.

Average temperature
Ketchikan, AK

Average high temperature in January:
36.5°F
Average high temperature in February:
37°F
Average high temperature in March:
40.3°F
Average high temperature in April:
46°F
Average high temperature in May:
53.4°F
Average high temperature in June:
56.7°F

Average high temperature in July:
60.8°F
Average high temperature in August:
60.8°F
Average high temperature in September:
56.3°F
Average high temperature in October:
48.2°F
Average high temperature in November:
40.8°F
Average high temperature in December:
35.8°F

The warmest months (with the highest average high temperature) are July and August (60.8°F).
The month with the lowest average high temperature is December (35.8°F).

Average low temperature in January:
31.6°F
Average low temperature in February:
30.6°F
Average low temperature in March:
32.4°F
Average low temperature in April:
37.2°F
Average low temperature in May:
43.5°F
Average low temperature in June:
47.3°F

Average low temperature in July:
51.4°F
Average low temperature in August:
52°F
Average low temperature in September:
48.7°F
Average low temperature in October:
42.1°F
Average low temperature in November:
36.1°F
Average low temperature in December:
31.5°F

The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is February (30.6°F).

Average pressure
Ketchikan, AK

The month with the highest atmospheric pressure is July (30.06"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).

Average wind speed
Ketchikan, AK

The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity
Ketchikan, AK

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is May (82%).

Average rainfall
Ketchikan, AK

The wettest month (with the highest rainfall) is January (9.69").
The driest month (with the least rainfall) is May (3.46").

Average rainfall days
Ketchikan, AK

Average rainfall days in January:
19.2 days
Average rainfall days in February:
14.2 days
Average rainfall days in March:
15.9 days
Average rainfall days in April:
20.7 days
Average rainfall days in May:
17.1 days
Average rainfall days in June:
18.8 days

Average rainfall days in July:
17.7 days
Average rainfall days in August:
18.6 days
Average rainfall days in September:
19.3 days
Average rainfall days in October:
20.3 days
Average rainfall days in November:
21.4 days
Average rainfall days in December:
18.6 days

The month with the highest number of rainy days is November (21.4 days).
The month with the least rainy days is February (14.2 days).

Average snowfall
Ketchikan, AK

The month with the highest snowfall is February (13.11").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days
Ketchikan, AK

Average snowfall days in January:
7.3 days
Average snowfall days in February:
8 days
Average snowfall days in March:
10.8 days
Average snowfall days in April:
2.5 days
Average snowfall days in May:
0.1 days
Average snowfall days in June:
0 days

Average snowfall days in July:
0 days
Average snowfall days in August:
0 days
Average snowfall days in September:
0 days
Average snowfall days in October:
0.1 days
Average snowfall days in November:
4.5 days
Average snowfall days in December:
7.4 days

The month with the highest number of snowfall days is March (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature
Ketchikan, AK

Average sea temperature in January:
43.3°F
Average sea temperature in February:
42.6°F
Average sea temperature in March:
42.5°F
Average sea temperature in April:
44.1°F
Average sea temperature in May:
48.1°F
Average sea temperature in June:
53°F

Average sea temperature in July:
55°F
Average sea temperature in August:
55.9°F
Average sea temperature in September:
53.3°F
Average sea temperature in October:
50.5°F
Average sea temperature in November:
47.8°F
Average sea temperature in December:
45.8°F

The best month for swimming (with the highest average sea temperature) is August (55.9°F).
The coldest month (with the lowest average sea temperature) is March (42.5°F).

Average daylight / Average sunshine
Ketchikan, AK

Average daylight in January:
7h and 5min
Average daylight in February:
9h and 4min
Average daylight in March:
11h and 5min
Average daylight in April:
14h and 1min
Average daylight in May:
16h and 2min
Average daylight in June:
17h and 2min

Average daylight in July:
16h and 5min
Average daylight in August:
14h and 5min
Average daylight in September:
12h and 4min
Average daylight in October:
10h and 2min
Average daylight in November:
8h and 2min
Average daylight in December:
7h and 1min

The month with the longest days is June (Average daylight: 17h and 24min).
The month with the shortest days is December (Average daylight: 7h and 12min).

Average sunshine in January:
3h and 0min
Average sunshine in February:
3h and 5min
Average sunshine in March:
4h and 4min
Average sunshine in April:
6h and 1min
Average sunshine in May:
7h and 1min
Average sunshine in June:
6h and 2min

Average sunshine in July:
6h and 5min
Average sunshine in August:
7h and 0min
Average sunshine in September:
6h and 2min
Average sunshine in October:
4h and 1min
Average sunshine in November:
3h and 1min
Average sunshine in December:
3h and 3min

The month with the most sunshine is May (Average sunshine: 7h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days
Ketchikan, AK

Average sunshine days in January:
7.8 days
Average sunshine days in February:
10.2 days
Average sunshine days in March:
8.6 days
Average sunshine days in April:
7.4 days
Average sunshine days in May:
11.8 days
Average sunshine days in June:
9.2 days

Average sunshine days in July:
11.9 days
Average sunshine days in August:
11.4 days
Average sunshine days in September:
9.9 days
Average sunshine days in October:
9.3 days
Average sunshine days in November:
5.6 days
Average sunshine days in December:
8.9 days

The month with the most sunshine days is July (11.9 days).
The month with the least sunshine days is November (5.6 days).

Average UV index
Ketchikan, AK

The months with the highest UV index are July and August (UV index 4).
The months with the lowest UV index are January, November and December (UV index 1).

Average cloud cover
Ketchikan, AK

The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is May (Cloud cover 55).

Average visibility
Ketchikan, AK

The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).

Climate and monthly weather forecastKetchikan, AK

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