Climate and monthly weather forecast
Chehalis, WA

Weather in January

January in Chehalis, Washington, is a frosty winter month, with temperature in the range of an average high of 44.6°F (7°C) and an average low of 33.8°F (1°C). In Chehalis, the average high-temperature in January is almost the same as in December - a chilly 44.6°F (7°C). Weather in January »

Weather in February

February, the last month of the winter in Chehalis, is also a frosty month, with an average temperature fluctuating between 33.4°F (0.8°C) and 46.4°F (8°C). In Chehalis, the average high-temperature in February is practically the same as in January - a still frosty 46.4°F (8°C). Weather in February »

Weather in March

March, the first month of the spring in Chehalis, is a fresh month, with an average temperature ranging between min 35.1°F (1.7°C) and max 50.5°F (10.3°C). In Chehalis, Washington, the average high-temperature in March is essentially the same as in February - a cool 50.5°F (10.3°C). Weather in March »

Weather in April

April in Chehalis, Washington, is a mild spring month, with an average temperature ranging between min 36.9°F (2.7°C) and max 56.1°F (13.4°C). In Chehalis, the average high-temperature in April marginally rises from a cool 50.5°F (10.3°C) in March to a moderate 56.1°F (13.4°C). Weather in April »

Weather in May

The last month of the spring, May, is an enjoyable month in Chehalis, Washington, with an average temperature fluctuating between 64.8°F (18.2°C) and 40.8°F (4.9°C). In May, the average high-temperature slightly increases from a moderate 56.1°F (13.4°C) in April to an enjoyable 64.8°F (18.2°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Chehalis, Washington, with an average temperature fluctuating between 69.4°F (20.8°C) and 44.8°F (7.1°C). In Chehalis, the average high-temperature in June is essentially the same as in May - a pleasant 69.4°F (20.8°C). Weather in June »

Weather in July

July is a moderately hot summer month in Chehalis, Washington, with an average temperature fluctuating between 48.4°F (9.1°C) and 76.6°F (24.8°C). In Chehalis, the average high-temperature in July slightly increases from a pleasant 69.4°F (20.8°C) in June to a warm 76.6°F (24.8°C). Weather in July »

Weather in August

August, the last month of the summer in Chehalis, is another warm month, with temperature in the range of an average low of 50°F (10°C) and an average high of 77.5°F (25.3°C). The warmest month is August, with an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 50°F (10°C). Weather in August »

Weather in September

September, the first month of the autumn in Chehalis, is still a pleasant month, with an average temperature fluctuating between 46.9°F (8.3°C) and 70.3°F (21.3°C). In Chehalis, the average high-temperature in September marginally drops from a warm 77.5°F (25.3°C) in August to an agreeable 70.3°F (21.3°C). Weather in September »

Weather in October

October, the same as September, in Chehalis, Washington, is a moderate autumn month, with an average temperature varying between 58.8°F (14.9°C) and 42.1°F (5.6°C). In Chehalis, the average high-temperature in October decreases from an agreeable 70.3°F (21.3°C) in September to a mild 58.8°F (14.9°C). Weather in October »

Weather in November

November, the last month of the autumn in Chehalis, is another chilly month, with an average temperature ranging between max 48.4°F (9.1°C) and min 37.9°F (3.3°C). In Chehalis, the average high-temperature in November drops from a moderate 58.8°F (14.9°C) in October to a chilly 48.4°F (9.1°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Chehalis, Washington, with an average temperature varying between 42.6°F (5.9°C) and 33.1°F (0.6°C). With an average high-temperature of 42.6°F (5.9°C) and an average low-temperature of 33.1°F (0.6°C), December is the coldest month. Weather in December »
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FAQ

What is the most humid month in Chehalis?

January, February, November and December, with an average relative humidity of 89%, are most humid months in Chehalis, Washington.

What is the rainiest month in Chehalis?

The month with the most rainfall in Chehalis is January, when the rain falls for 18.6 days and typically aggregates up to 5.51" (140mm) of precipitation.

How many days does it rain in Chehalis?

In Chehalis, during the entire year, the rain falls for 185.5 days and collects up to 36.1" (917mm) of precipitation.

When does it snow in Chehalis?

January through March, November and December are months with snowfall in Chehalis, Washington.

How much does it snow in Chehalis?

Throughout the year, in Chehalis, there are 9 snowfall days, and 5.59" (142mm) of snow is accumulated.

What are the months with the lowest UV index in Chehalis?

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

When does it snow the most in Chehalis?

February is the month with the most snowfall. Snow falls for 3.5 days and accumulates 1.93" (49mm) of snow.

When is Daylight Saving Time (DST) in Chehalis?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from PDT to PST.

When it does not snow in Chehalis?

In Chehalis, Washington, snow does not fall in April through October.

When are the longest days in Chehalis?

June has the longest days of the year in Chehalis, with an average of 15h and 47min of daylight.

What is the least humid month in Chehalis?

July is the least humid month in Chehalis, Washington, with an average relative humidity of 73%.

What is the driest month in Chehalis?

July is the month with the least rainfall in Chehalis. Rain falls for 6.5 days and accumulates 0.47" (12mm) of precipitation.

When is the highest UV index in Chehalis?

With an average maximum UV index of 5, July is the month with the highest UV index.

What is the warmest month in Chehalis?

August is the warmest month, with an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 50°F (10°C).

What month has the most sunshine in Chehalis?

The month with the most sunshine in Chehalis is August, with an average of 10.2h of sunshine.

What is the coldest month in Chehalis?

With an average high-temperature of 42.6°F (5.9°C) and an average low-temperature of 33.1°F (0.6°C), December is the coldest month in Chehalis, Washington.

What is the month with the shortest days in Chehalis?

December has the shortest days of the year, with an average of 8h and 38min of daylight.

What is the month with the least sunshine in Chehalis?

With an average of 3.5h of sunshine, December has the least sunshine of the year in Chehalis.

Average temperature
Chehalis, WA

Average temperature - Chehalis, WA

The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is December (42.6°F).

The month with the highest average low temperature is August (50°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).

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Average pressure
Chehalis, WA

Average pressure - Chehalis, WA

The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.02"Hg).

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Average wind speed
Chehalis, WA

Average wind speed - Chehalis, WA

The windiest months (with the highest average wind speed) are January, March and November (4.5mph).
The calmest month (with the lowest average wind speed) is September (3.6mph).

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Average humidity
Chehalis, WA

Average humidity - Chehalis, WA

The months with the highest relative humidity are January, February, November and December (89%).
The month with the lowest relative humidity is July (73%).

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Average rainfall
Chehalis, WA

Average rainfall - Chehalis, WA

The wettest month (with the highest rainfall) is January (5.51").
The driest month (with the least rainfall) is July (0.47").

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Average rainfall days
Chehalis, WA

Average rainfall days - Chehalis, WA

The month with the highest number of rainy days is March (21.5 days).
The month with the least rainy days is August (6.4 days).

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Average snowfall
Chehalis, WA

Average snowfall - Chehalis, WA

The month with the highest snowfall is February (1.93").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days
Chehalis, WA

Average snowfall days - Chehalis, WA

The month with the highest number of snowfall days is February (3.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Chehalis, WA

Average daylight / Average sunshine - Chehalis, WA

The month with the longest days is June (Average daylight: 15h and 47min).
The month with the shortest days is December (Average daylight: 8h and 38min).

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 30min).

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Average sunshine days
Chehalis, WA

Average sunshine days - Chehalis, WA

The months with the most sunshine days are July and August (20.8 days).
The month with the least sunshine days is February (7.6 days).

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Average UV index
Chehalis, WA

Average UV index - Chehalis, WA

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Chehalis, WA

Average visibility - Chehalis, WA

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).

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