Monthly weather forecast and climate
Saint John, WA

The average high-temperature, in January, is 37.9°F (3.3°C), while the average low-temperature is 24.6°F (-4.1°C). In January, the rain falls for 13 days.
Weather in January »
In Saint John, the average high-temperature is 44.1°F (6.7°C), and the average low-temperature is 27.7°F (-2.4°C). In Saint John, during 10 rainfall days, 1.4" (36.3mm) of precipitation is typically accumulated.
Weather in February »
In March, the average high-temperature is 52°F (11.1°C), and the average low-temperature is 30.9°F (-0.6°C). In Saint John, in March, it is raining for 11 days, with typically 1.7" (42.9mm) of accumulated precipitation.
Weather in March »
In April, in Saint John, the average high-temperature is 60.1°F (15.6°C), and the average low-temperature is 34.7°F (1.5°C). In Saint John, Washington, in April, it is raining for 9 days, with typically 1.5" (37.1mm) of accumulated precipitation.
Weather in April »
In Saint John, the average high-temperature is 68.7°F (20.4°C), and the average low-temperature is 40.5°F (4.7°C). In Saint John, Washington, in May, it is raining for 9 days, with typically 1.5" (39.1mm) of accumulated precipitation.
Weather in May »
The average high-temperature, in June, is 76.1°F (24.5°C), while the average low-temperature is 46°F (7.8°C). In Saint John, during June, the rain falls for 7 days and regularly aggregates up to 1.2" (30.5mm) of precipitation.
Weather in June »
With an average high-temperature of 85.5°F (29.7°C) and an average low-temperature of 49.8°F (9.9°C), July is the warmest month. In July, the rain falls for 4 days.
Weather in July »
The average high-temperature, in Saint John, is 85.3°F (29.6°C), while the average low-temperature is 49.3°F (9.6°C). The month with the least rainfall is August when the rain falls for 3 days and typically collects 0.6" (15.5mm) of precipitation.
Weather in August »
The average high-temperature, is 76.3°F (24.6°C), while the average low-temperature is 42.4°F (5.8°C). In Saint John, in September, it is raining for 5 days, with typically 0.7" (18.5mm) of accumulated precipitation.
Weather in September »
In October, the average high-temperature is 62.8°F (17.1°C), and the average low-temperature is 34°F (1.1°C). In Saint John, Washington, it is raining for 8 days, with typically 1.2" (30.2mm) of accumulated precipitation.
Weather in October »
In Saint John, Washington, the average high-temperature is 46.2°F (7.9°C), and the average low-temperature is 30°F (-1.1°C). In Saint John, in November, it is raining for 13 days, with typically 2.2" (56.1mm) of accumulated precipitation.
Weather in November »
With an average high-temperature of 37.2°F (2.9°C) and an average low-temperature of 24.3°F (-4.3°C), December is the coldest month. The month with the most rainfall is December when the rain falls for 13 days and typically aggregates up to 2.4" (61.2mm) of precipitation.
Weather in December »

How many days does it rain in Saint John?

In Saint John, Washington, during the entire year, the rain falls for 105 days and collects up to 17.2" (437.8mm) of precipitation.

When does it snow in Saint John?

Months with snowfall in Saint John, Washington, are January through April, October through December.

How much does it snow in Saint John?

Throughout the year, in Saint John, 25.3" (642.5mm) of snow is accumulated.

What is the snowiest month in Saint John?

The month with the most snowfall in Saint John, Washington, is January when 9.6" (243.8mm) of snow is typically aggregated.

When are the longest days in Saint John?

The month with the longest days is June, with an average of 15.9h of daylight.

What is the warmest month in Saint John?

The warmest month in Saint John is July, with an average high-temperature of 85.5°F (29.7°C) and an average low-temperature of 49.8°F (9.9°C).

What is the driest month in Saint John?

The month with the least rainfall is August when the rain falls for 3 days and typically collects 0.6" (15.5mm) of precipitation.

What is the coldest month in Saint John?

December is the coldest month in Saint John, Washington, with an average high-temperature of 37.2°F (2.9°C) and an average low-temperature of 24.3°F (-4.3°C).

What is the wettest month in Saint John?

December is the month with the most rainfall in Saint John, Washington. Rain falls for 13 days and accumulates 2.4" (61.2mm) of precipitation.

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

December has the shortest days of the year, with an average of 8.6h of daylight.
Average temperature - Saint John, WA
Average rainfall - Saint John, WA
Average rainfall days - Saint John, WA

Months with the highest number of rainy days are January, November and December (13 days).
The month with the lowest number of rainy days is August (3 days).

Average snowfall - Saint John, WA
Average daylight - 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).

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