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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January is a frosty winter month in Chehalis, Washington, with temperature in the range of an average low of 33.8°F (1°C) and an average high of 44.6°F (7°C). The arrival of January marks a slight shift to an average high-temperature of a frosty 44.6°F (7°C) from December's 42.6°F (5.9°C). Weather in January »
Weather in February
The last month of the winter, February, is another chilly month in Chehalis, Washington, with temperature in the range of an average low of 33.4°F (0.8°C) and an average high of 46.4°F (8°C). The transition into February notes an average high-temperature of a still chilly 46.4°F (8°C), revealing a mild distinction from the 44.6°F (7°C) in January. Weather in February »
Weather in March
The first month of the spring, March, is a cool month in Chehalis, Washington, with an average temperature fluctuating between 50.5°F (10.3°C) and 35.1°F (1.7°C). The average high-temperature during March registers at a cool 50.5°F (10.3°C), maintaining a close resemblance to the previous month. Weather in March »
Weather in April
April in Chehalis, Washington, is a moderate spring month, with an average temperature ranging between max 56.1°F (13.4°C) and min 36.9°F (2.7°C). Chehalis's April weather indicates a minor increase in high-temperatures, edging from March's cool 50.5°F (10.3°C) to a mild 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 ranging between min 40.8°F (4.9°C) and max 64.8°F (18.2°C). With the onset of May, Chehalis's average high-temperature sees a modest rise, moving from April's refreshing 56.1°F (13.4°C) to a comfortable 64.8°F (18.2°C). Weather in May »
Weather in June
June, the first month of the summer in Chehalis, is an agreeable month, with an average temperature fluctuating between 69.4°F (20.8°C) and 44.8°F (7.1°C). Chehalis commences June with an average high-temperature of a pleasant 69.4°F (20.8°C), maintaining a close resemblance to the previous month. Weather in June »
Weather in July
July in Chehalis, Washington, is a warm summer month, with temperature in the range of an average high of 76.6°F (24.8°C) and an average low of 48.4°F (9.1°C). With the onset of July, the average high-temperature subtly transitions from an agreeable 69.4°F (20.8°C) in June to a moderately hot 76.6°F (24.8°C). Weather in July »
Weather in August
August, the last month of the summer in Chehalis, is also a moderately hot month, with an average temperature ranging between min 50°F (10°C) and max 77.5°F (25.3°C). August, having an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 50°F (10°C), is the warmest month. Weather in August »
Weather in September
September, the first month of the autumn in Chehalis, is still a pleasant month, with temperature in the range of an average high of 70.3°F (21.3°C) and an average low of 46.9°F (8.3°C). In Chehalis, entering September brings a subtle temperature decrement, reducing from August's moderately hot 77.5°F (25.3°C) to a pleasant 70.3°F (21.3°C). Weather in September »
Weather in October
October, the same as September, in Chehalis, Washington, is another refreshing autumn month, with an average temperature ranging between min 42.1°F (5.6°C) and max 58.8°F (14.9°C). The onset of October coincides with a reduction in the average high-temperature, falling from a pleasant 70.3°F (21.3°C) in September to a moderate 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). With the beginning of November, the average high-temperature shows a decrease, transitioning from a refreshing 58.8°F (14.9°C) in October to a frosty 48.4°F (9.1°C). Weather in November »
Weather in December
December, the first month of the winter in Chehalis, is also a wintry month, with an average temperature varying between 42.6°F (5.9°C) and 33.1°F (0.6°C). With average temperatures fluctuating between a high of 42.6°F (5.9°C) and a low of 33.1°F (0.6°C), December stands out as the coldest month. Weather in December »
Updated: Jun 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the most humid months?
January, February, November and December, with an average relative humidity of 89%, are most humid months.
What is the rainiest month?
January is the month with the most rainfall. Rain falls for 18.6 days and accumulates 5.51" (140mm) of precipitation.
How much does it rain?
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?
January through March, November and December are months with snowfall.
How much does it snow?
In Chehalis, during the entire year, snow falls for 9 days and aggregates up to 5.59" (142mm) of snow.
What are the months 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.
When does it snow the most?
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)?
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?
April through 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 least humid month?
July is the least humid month, with an average relative humidity of 73%.
What is the driest month in Chehalis?
The month with the least rainfall is July, when the rain falls for 6.5 days and typically collects 0.47" (12mm) of precipitation.
When is the highest UV index in Chehalis?
July is the month with the highest UV index, with an average maximum UV index of 5.
What is the hottest time of year?
August, characterized by an average high temperature of 77.5°F (25.3°C) and a low temperature of 50°F (10°C), is generally the warmest month.
What month has the most sunshine?
With an average of 10.2h of sunshine, August has the most sunshine of the year.
What is the coldest time of year?
December, marked by an average high-temperature of 42.6°F (5.9°C) and a low-temperature of 33.1°F (0.6°C), is the coldest month.
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 3.5h of sunshine, December has the least sunshine of the year.
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).
Average pressure
Chehalis, WA
- Average pressure in January:
30.09"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
30.06"Hg - Average pressure in May:
30.04"Hg - Average pressure in June:
30.04"Hg
- Average pressure in July:
30.06"Hg - Average pressure in August:
30.02"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.04"Hg - Average pressure in December:
30.08"Hg
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).
Average wind speed
Chehalis, WA
- Average wind speed in January:
4.5mph - Average wind speed in February:
4.3mph - Average wind speed in March:
4.5mph - Average wind speed in April:
4.3mph - Average wind speed in May:
4mph - Average wind speed in June:
4mph
- Average wind speed in July:
3.9mph - Average wind speed in August:
3.7mph - Average wind speed in September:
3.6mph - Average wind speed in October:
3.9mph - Average wind speed in November:
4.5mph - Average wind speed in December:
4.3mph
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).
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%).
Average rainfall
Chehalis, WA
- Average rainfall in January:
5.51" - Average rainfall in February:
3.7" - Average rainfall in March:
3.9" - Average rainfall in April:
2.91" - Average rainfall in May:
2.09" - Average rainfall in June:
1.5"
- Average rainfall in July:
0.47" - Average rainfall in August:
0.55" - Average rainfall in September:
1.65" - Average rainfall in October:
4.09" - Average rainfall in November:
4.37" - Average rainfall in December:
5.35"
The wettest month (with the highest rainfall) is January (5.51").
The driest month (with the least rainfall) is July (0.47").
Average rainfall days
Chehalis, WA
- Average rainfall days in January:
18.6 days - Average rainfall days in February:
18.1 days - Average rainfall days in March:
21.5 days - Average rainfall days in April:
19 days - Average rainfall days in May:
14.6 days - Average rainfall days in June:
12.6 days
- Average rainfall days in July:
6.5 days - Average rainfall days in August:
6.4 days - Average rainfall days in September:
11.3 days - Average rainfall days in October:
16.7 days - Average rainfall days in November:
20.2 days - Average rainfall days in December:
20 days
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).
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").
Average snowfall days
Chehalis, WA
- Average snowfall days in January:
1.8 days - Average snowfall days in February:
3.5 days - Average snowfall days in March:
1.7 days - Average snowfall days in April:
0.1 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.5 days - Average snowfall days in December:
1.4 days
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).
Average daylight / Average sunshine
Chehalis, WA
- Average daylight in January:
9h and 1min - Average daylight in February:
10h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 4min - Average daylight in May:
15h and 1min - Average daylight in June:
15h and 5min
- Average daylight in July:
15h and 2min - Average daylight in August:
14h and 1min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 2min - Average daylight in December:
8h and 4min
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).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
3h and 4min - Average sunshine in March:
5h and 0min - Average sunshine in April:
6h and 5min - Average sunshine in May:
8h and 0min - Average sunshine in June:
8h and 4min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 2min - Average sunshine in October:
4h and 5min - Average sunshine in November:
3h and 5min - Average sunshine in December:
3h and 3min
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).
Average sunshine days
Chehalis, WA
- Average sunshine days in January:
9.6 days - Average sunshine days in February:
7.6 days - Average sunshine days in March:
8.2 days - Average sunshine days in April:
9.7 days - Average sunshine days in May:
15 days - Average sunshine days in June:
14.8 days
- Average sunshine days in July:
20.8 days - Average sunshine days in August:
20.8 days - Average sunshine days in September:
16.9 days - Average sunshine days in October:
12.9 days - Average sunshine days in November:
8.5 days - Average sunshine days in December:
9.5 days
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).
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).
Average cloud cover
Chehalis, WA
The months with the most cloud cover are January, February and December (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 38).
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).
Chehalis, Washington, USA
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