Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average sea temperature in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
With the onset of May, the average high-temperature subtly transitions from a frosty 46°F (7.8°C) in April to a fresh 53.4°F (11.9°C). Ketchikan observes an average nighttime temperature of 43.5°F (6.4°C) during May.Humidity
The least humid month is May, with an average relative humidity of 82%.Rainfall
May is the month with the least rainfall. Rain falls for 17.1 days and accumulates 3.46" (88mm) of precipitation.Snowfall
Months with snowfall are January through May, November and December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Ketchikan aggregates 0.08" (2mm) of snow. In Ketchikan, during the entire year, snow falls for 40.7 days and aggregates up to 48.35" (1228mm) of snow.Ocean temperature
In May, the average ocean temperature is 48°F (8.9°C).Note: If planning to swim in 48°F (8.9°C) under 50°F (10°C), wear a protective suit. Neglecting this advice might cause immediate cold shock and troubled breathing. A splash around 55.4°F (13°C) is not much warmer.
Daylight
The average length of the day in May is 16h and 15min.On the first day of May, sunrise is at 5:02 am and sunset at 8:24 pm. On the last day of the month, sunrise is at 4:12 am and sunset at 9:16 pm AKDT.
Sunshine
With an average of 7.2h of sunshine, May has the most sunshine of the year.UV index
In Ketchikan, Alaska, the average daily maximum UV index in May is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In May, a regular UV index of 3 translates into these guidelines:
Exercise prevention - Precautions against solar damage are endorsed. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Ketchikan in May?
What is the least humid month?
What is the average humidity in May?
What is the driest month?
How much does it rain in May?
What is the last month it snows?
What is the water temperature in May?
How many hours of daylight does Ketchikan have in May?
When are sunrise and sunset in May?
What month has the most sunshine?
How long on average sun shines in May?
How high is the UV index in May?
Average temperature in May
Ketchikan, AK
- Average high temperature in May: 53.4°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 May: 43.5°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 in May
Ketchikan, AK
- Average pressure in May: 30.01"Hg
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 in May
Ketchikan, AK
- Average wind speed in May: 5.5mph
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 in May
Ketchikan, AK
- Average humidity in May: 82%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is May (82%).
Average rainfall in May
Ketchikan, AK
- Average rainfall in May: 3.46"
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 in May
Ketchikan, AK
- Average rainfall days in May: 17.1 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 in May
Ketchikan, AK
- Average snowfall in May: 0.08"
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 in May
Ketchikan, AK
- Average snowfall days in May: 0.1 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 in May
Ketchikan, AK
- Average sea temperature in May: 48.1°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 in May /
Average sunshine in May
Ketchikan, AK
- Average daylight in May: 16h and 2min
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 May: 7h and 1min
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 in May
Ketchikan, AK
- Average sunshine days in May: 11.8 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 in May
Ketchikan, AK
- Average UV index in May: 3
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 in May
Ketchikan, AK
- Average cloud cover in May: 55
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 in May
Ketchikan, AK
- Average visibility in May: 6mi
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).
Ketchikan, Alaska, USA
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