Saint John
Washington, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Saint John, WA

January, like December, in Saint John, Washington, is a wintry winter month, with average temperature fluctuating between 24.6°F (-4.1°C) and 34.5°F (1.4°C). In Saint John, the average high-temperature is relatively the same as in December - a still wintry 34.5°F (1.4°C). Weather in January »

February, the last month of the winter, in Saint John, is another cold month, with average temperature varying between 37.9°F (3.3°C) and 26.8°F (-2.9°C). In February, the average high-temperature is essentially the same as in January - a still wintry 37.9°F (3.3°C). Weather in February »

March, the first month of the spring, in Saint John, is a frosty month, with average temperature varying between 32.7°F (0.4°C) and 46.9°F (8.3°C). In Saint John, the average high-temperature in March rises, from a wintry 37.9°F (3.3°C) in February, to a frosty 46.9°F (8.3°C). Weather in March »

April in Saint John, Washington, is a moderate spring month, with average temperature varying between 55.9°F (13.3°C) and 37.4°F (3°C). In April, the average high-temperature increases, from a chilly 46.9°F (8.3°C) in March, to a mild 55.9°F (13.3°C). Weather in April »

The last month of the spring, May, is an enjoyable month in Saint John, Washington, with average temperature ranging between max 65.7°F (18.7°C) and min 44.2°F (6.8°C). In Saint John, the average high-temperature increases, from a moderate 55.9°F (13.3°C) in April, to an enjoyable 65.7°F (18.7°C). Weather in May »

June, the first month of the summer, in Saint John, is an agreeable month, with average temperature ranging between min 49.8°F (9.9°C) and max 72.1°F (22.3°C). In Saint John, the average high-temperature in June slightly increases, from an enjoyable 65.7°F (18.7°C) in May, to an agreeable 72.1°F (22.3°C). Weather in June »

July in Saint John, Washington, is a moderately hot summer month, with temperature in the range of an average low of 58.6°F (14.8°C) and an average high of 84.4°F (29.1°C). July is the warmest month, with an average high-temperature of 84.4°F (29.1°C) and an average low-temperature of 58.6°F (14.8°C). In July, the average heat index is estimated at 83.7°F (28.7°C). Weather in July »

The last month of the summer, August, is another warm month in Saint John, Washington, with temperature in the range of an average low of 61.3°F (16.3°C) and an average high of 83.8°F (28.8°C). In Saint John, Washington, the average high-temperature is practically the same as in July - a still moderately hot 83.8°F (28.8°C). Weather in August »

September, the first month of the autumn, in Saint John, is still a pleasant month, with temperature in the range of an average low of 53.2°F (11.8°C) and an average high of 72.9°F (22.7°C). In September, the average high-temperature drops, from a warm 83.8°F (28.8°C) in August, to a pleasant 72.9°F (22.7°C). Weather in September »

October, the same as September, in Saint John, Washington, is a moderate autumn month, with average temperature ranging between min 41.9°F (5.5°C) and max 56.8°F (13.8°C). In Saint John, the average high-temperature significantly decreases, from an agreeable 72.9°F (22.7°C) in September, to a moderate 56.8°F (13.8°C). Weather in October »

November, the last month of the autumn, in Saint John, is also a frosty month, with average temperature ranging between min 31.8°F (-0.1°C) and max 43°F (6.1°C). In Saint John, the average high-temperature in November decreases, from a moderate 56.8°F (13.8°C) in October, to a chilly 43°F (6.1°C). Weather in November »

December, the first month of the winter, in Saint John, is also a wintry month, with average temperature varying between 33.1°F (0.6°C) and 23.9°F (-4.5°C). December is the coldest month, with an average high-temperature of 33.1°F (0.6°C) and an average low-temperature of 23.9°F (-4.5°C). Weather in December »

What is the most humid month in Saint John?

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

How many days does it rain in Saint John?

In Saint John, during the entire year, the rain falls for 84.3 days and collects up to 7.24" (184mm) of precipitation.

What is the rainiest month in Saint John?

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

When does it snow in Saint John?

Months with snowfall are January through May, September, November and December.

How much does it snow in Saint John?

In Saint John, Washington, during the entire year, snow falls for 32.5 days, and aggregates up to 14.09" (358mm) of snow.

What are the months with the lowest UV index in Saint John?

Months with the lowest UV index in Saint John, Washington, are January, February, November and December, with an average maximum UV index of 2.

When does it snow the most in Saint John?

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

When it does not snow in Saint John?

June through August and October are months without snowfall.

When are the longest days in Saint John?

June has the longest days of the year in Saint John, with an average of 15.9h of daylight.

What is the warmest month in Saint John?

July is the warmest month, with an average high-temperature of 84.4°F (29.1°C) and an average low-temperature of 58.6°F (14.8°C).

What is the driest month in Saint John?

July is the month with the least rainfall. Rain falls for 3.5 days and accumulates 0.16" (4mm) of precipitation.

When is the highest UV index in Saint John?

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

What is the least humid month in Saint John?

August is the least humid month in Saint John, Washington, with an average relative humidity of 36%.

What month has the most sunshine in Saint John?

August has the most sunshine of the year in Saint John, Washington, with an average of 12.1h of sunshine.

What is the coldest month in Saint John?

December is the coldest month in Saint John, Washington, with an average high-temperature of 33.1°F (0.6°C) and an average low-temperature of 23.9°F (-4.5°C).

What is the month with the shortest days in Saint John?

December has the shortest days of the year in Saint John, with an average of 8.6h of daylight.

What is the month with the least sunshine in Saint John?

With an average of 4.3h of sunshine, December has the least sunshine of the year in Saint John, Washington.
Average temperature - Saint John, WA
Average rainfall - Saint John, WA

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

Average rainfall days - Saint John, WA

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

Average snowfall - Saint John, WA
Average snowfall days - Saint John, WA

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

Average daylight / Average sunshine - Saint John, WA

The month with the longest days is June (Average daylight: 15.9h).
The month with shortest days is December (Average daylight: 8.6h).

The month with most sunshine is August (Average sunshine: 12.1h).
The month with least sunshine is December (Average sunshine: 4.3h).