Climate and monthly weather forecast
Saint John, WA

Share

Weather in January

January, the same as December, is an icy winter month in Saint John, Washington, with an average temperature ranging between max 34.5°F (1.4°C) and min 24.6°F (-4.1°C). The shift into January reveals an average high-temperature of a still cold 34.5°F (1.4°C), closely mirroring December's climate. Weather in January »

Weather in February

February, the last month of the winter in Saint John, is another cold month, with an average temperature fluctuating between 26.8°F (-2.9°C) and 37.9°F (3.3°C). The transition from January to February brings an average high-temperature of a still icy 37.9°F (3.3°C), barely different from January's 34.5°F (1.4°C). Weather in February »

Weather in March

The first month of the spring, March, is a chilly month in Saint John, Washington, with temperature in the range of an average low of 32.7°F (0.4°C) and an average high of 46.9°F (8.3°C). The beginning of March signals a rise in the average high-temperature, moving from a wintry 37.9°F (3.3°C) in February to a frosty 46.9°F (8.3°C). Weather in March »

Weather in April

April is a moderate spring month in Saint John, Washington, with an average temperature ranging between min 37.4°F (3°C) and max 55.9°F (13.3°C). With the onset of April, Saint John's average high-temperature experiences a rise, moving from March's frosty 46.9°F (8.3°C) to a moderate 55.9°F (13.3°C). Weather in April »

Weather in May

May, the last month of the spring in Saint John, is a refreshing month, with an average temperature varying between 44.2°F (6.8°C) and 65.7°F (18.7°C). Saint John sees an increase in the average high-temperature with the arrival of May, moving from April's refreshing 55.9°F (13.3°C) to an enjoyable 65.7°F (18.7°C). Weather in May »

Weather in June

June, the first month of the summer in Saint John, is a pleasant month, with an average temperature fluctuating between 72.1°F (22.3°C) and 49.8°F (9.9°C). Saint John's transition into June sees a mild rise in the average high-temperature, edging from a comfortable 65.7°F (18.7°C) in May to a pleasant 72.1°F (22.3°C). Weather in June »

Weather in July

July in Saint John, Washington, is a moderately hot summer month, with an average temperature ranging between max 84.4°F (29.1°C) and min 58.6°F (14.8°C). Saint John's warmest month, July, generally records average temperatures ranging from a high of 84.4°F (29.1°C) to a low of 58.6°F (14.8°C). The heat index in July is estimated at 84.2°F (29°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Saint John, Washington, with temperature in the range of an average high of 83.8°F (28.8°C) and an average low of 61.3°F (16.3°C). At the start of August, Saint John's average high-temperature reaches a still warm 83.8°F (28.8°C), subtly different from the preceding month. Weather in August »

Weather in September

September, the first month of the autumn in Saint John, is also an agreeable month, with an average temperature varying between 72.9°F (22.7°C) and 53.2°F (11.8°C). Saint John's transition into September involves a shift in temperature, receding from a warm 83.8°F (28.8°C) in August to a pleasant 72.9°F (22.7°C). Weather in September »

Weather in October

October, the same as September, in Saint John, Washington, is another refreshing autumn month, with temperature in the range of an average high of 56.8°F (13.8°C) and an average low of 41.9°F (5.5°C). October brings with it a considerable temperature decrease, with average high-temperatures dropping from September's agreeable 72.9°F (22.7°C) to a moderate 56.8°F (13.8°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Saint John, Washington, with an average temperature ranging between max 43°F (6.1°C) and min 31.8°F (-0.1°C). Saint John in November demonstrates a small temperature transition, adjusting from an average high of a mild 56.8°F (13.8°C) in October to a chilly 43°F (6.1°C). Weather in November »

Weather in December

December, the first month of the winter in Saint John, is still a cold month, with temperature in the range of an average low of 23.9°F (-4.5°C) and an average high of 33.1°F (0.6°C). With an average high-temperature of 33.1°F (0.6°C) and an average low-temperature of 23.9°F (-4.5°C), December is the coldest month. Weather in December »
Updated: Jul 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the most humid month?

The most humid month is January, with an average relative humidity of 87%.

What is the rainiest month?

The months with the most rainfall in Saint John are January and May, with an average 0.91" (23mm) of precipitation.

How many days does it rain?

Throughout the year, there are 84.3 rainfall days, and 7.24" (184mm) of precipitation is accumulated.

When does it snow?

January through May, September, November and December are months with snowfall in Saint John.

How many days does it snow?

Throughout the year, there are 32.5 snowfall days, and 14.09" (358mm) of snow is accumulated.

What is the month with the lowest UV index?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the snowiest month?

February is the month with the most snowfall. Snow falls for 7.6 days and accumulates 3.82" (97mm) of snow.

When is Daylight Saving Time (DST) in Saint John?

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

When it does not snow?

June through August and October are months without snowfall.

When are the longest days?

June has the longest days of the year, with an average of 15h and 48min of daylight.

What is the warmest month?

July, with average temperatures reaching a high of 84.4°F (29.1°C) and a low of 58.6°F (14.8°C), is the warmest month.

What is the driest month in Saint John?

The month with the least rainfall is July, when the rain falls for 3.5 days and typically collects 0.16" (4mm) of precipitation.

When is the highest UV index?

The month with the highest UV index is July, with an average maximum UV index of 7.

What is the least humid month?

With an average relative humidity of 36%, August is the least humid month.

What month has the most sunshine?

The month with the most sunshine is August, with an average of 12.1h of sunshine.

What is the coldest month?

In Saint John, December is the month with the lowest recorded average temperatures, measuring a high of 33.1°F (0.6°C) and a low of 23.9°F (-4.5°C).

What is the month with the shortest days?

The month with the shortest days is December, with an average of 8h and 36min of daylight.

What is the month with the least sunshine?

With an average of 4.3h of sunshine, December has the least sunshine of the year.

Average temperature
Saint John, WA

Average temperature - Saint John, WA

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is December (33.1°F).

The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).

Average pressure
Saint John, WA

Average pressure - Saint John, WA

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).

Average wind speed
Saint John, WA

Average wind speed - Saint John, WA

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

Average humidity
Saint John, WA

Average humidity - Saint John, WA

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (36%).

Average rainfall
Saint John, WA

Average rainfall - Saint John, WA

The wettest months (with the highest rainfall) are January and May (0.91").
The driest month (with the least rainfall) is July (0.16").

Average rainfall days
Saint John, WA

Average rainfall days - Saint John, WA

The month with the highest number of rainy days is March (10.1 days).
The month with the least rainy days is July (3.5 days).

Average snowfall
Saint John, WA

Average snowfall - Saint John, WA

The month with the highest snowfall is February (3.82").
The months with the least snowfall are June, July, August and October (0").

Average snowfall days
Saint John, WA

Average snowfall days - Saint John, WA

The month with the highest number of snowfall days is December (9.3 days).
The months with the least snowfall days are June, July, August and October (0 days).

Average daylight / Average sunshine
Saint John, WA

Average daylight / Average sunshine - Saint John, WA

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).

Average sunshine days
Saint John, WA

Average sunshine days - Saint John, WA

The month with the most sunshine days is July (26.6 days).
The month with the least sunshine days is February (15.9 days).

Average UV index
Saint John, WA

Average UV index - Saint John, WA

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average visibility
Saint John, WA

Average visibility - Saint John, WA

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

Saint John, Washington, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location