September weather forecast
Chewelah, WA

A straight road through a small town in Chewelah, Washington
A straight road through a small town in Chewelah, Washington

Weather in September

The first month of the autumn, September, is also an agreeable month in Chewelah, Washington, with average temperature varying between 44.6°F (7°C) and 71.6°F (22°C).

Temperature

In Chewelah, Washington, the average high-temperature in September decreases, from a moderately hot 83.1°F (28.4°C) in August, to a pleasant 71.6°F (22°C). The average low-temperature, in Chewelah, is 44.6°F (7°C).

Humidity

In Chewelah, the average relative humidity in September is 57%.

Rainfall

In Chewelah, Washington, during September, the rain falls for 7.8 days and regularly aggregates up to 0.83" (21mm) of precipitation. Throughout the year, in Chewelah, Washington, there are 141.6 rainfall days, and 17.56" (446mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Chewelah are January through April, September through December. September is the first month it typically snows in Chewelah, Washington. Throughout September, in the average 0.2 snowfall days, it receives 0.63" (16mm) of snow. In Chewelah, Washington, during the entire year, snow falls for 57.8 days, and aggregates up to 34.09" (866mm) of snow.

Daylight

In September, the average length of the day is 12.5h.

Sunshine

In Chewelah, the average sunshine is 10.3h.

UV index

In Chewelah, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 3 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in Chewelah?

In Chewelah, Washington, the average relative humidity in September is 57%.

How much does it rain in Chewelah in September?

In Chewelah, Washington, in September, during 7.8 rainfall days, 0.83" (21mm) of precipitation is typically accumulated.

When does it start snowing in Chewelah?

September is the first month it typically snows in Chewelah, Washington. Throughout September, in the average 0.2 snowfall days, it receives 0.63" (16mm) of snow.

How many hours of daylight does Chewelah have in September?

In September, the average length of the day in Chewelah is 12.5h.

How long on average sun shines in September in Chewelah?

In September, the average sunshine is 10.3h.

What is the UV index intensity in September in Chewelah?

The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Chewelah, WA

Average temperature in September - Chewelah, WA
  • Average high temperature in September: 71.6°F

The warmest month (with the highest average high temperature) is August (83.1°F).
The month with the lowest average high temperature is December (29.8°F).

  • Average low temperature in September: 44.6°F

The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is December (18.7°F).

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Average pressure in September
Chewelah, WA

Average pressure in September - Chewelah, WA
  • Average pressure in September: 29.96"

The month with the highest atmospheric pressure is January (30.19").
Months with the lowest atmospheric pressure are June and August (29.91").

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Average wind speed in September
Chewelah, WA

Average wind speed in September - Chewelah, WA
  • Average wind speed in September: 4mph

The windiest month (with the highest average wind speed) is April (4.7mph).
The calmest months (with the lowest average wind speed) are January and December (3.5mph).

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Average humidity in September
Chewelah, WA

Average humidity in September - Chewelah, WA
  • Average humidity in September: 57%

The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is August (47%).

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Average rainfall in September
Chewelah, WA

Average rainfall in September - Chewelah, WA
  • Average rainfall in September: 0.83"

The wettest month (with the highest rainfall) is January (2.2").
The driest month (with the least rainfall) is August (0.35").

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Average rainfall days in September
Chewelah, WA

Average rainfall days in September - Chewelah, WA
  • Average rainfall days in September: 7.8 days

The month with the highest number of rainy days is March (17.1 days).
The month with the least rainy days is August (5.6 days).

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Average snowfall in September
Chewelah, WA

Average snowfall in September - Chewelah, WA
  • Average snowfall in September: 0.63"

The month with the highest snowfall is January (10.47").
Months with the least snowfall are May, June, July and August (0").

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Average snowfall days in September
Chewelah, WA

Average snowfall days in September - Chewelah, WA
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (15.4 days).
Months with the least snowfall days are May, June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Chewelah, WA

Average daylight in September / Average sunshine in September - Chewelah, WA
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.4h).

  • Average sunshine in September: 10.3h

The month with the most sunshine is August (Average sunshine: 12h).
The month with the least sunshine is January (Average sunshine: 3.6h).

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Average sunshine days in September
Chewelah, WA

Average sunshine days in September - Chewelah, WA
  • Average sunshine days in September: 19.5 days

The month with the most sunshine days is August (22.9 days).
The month with the least sunshine days is March (9.3 days).

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Average UV index in September
Chewelah, WA

Average UV index in September - Chewelah, WA
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in September
Chewelah, WA

Average cloud cover in September - Chewelah, WA
  • Average cloud cover in September: 21

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in September
Chewelah, WA

Average visibility in September - Chewelah, WA
  • Average visibility in September: 6mi

Months with the highest visibility are April, May, June, July, August, September and October (6mi).
Months with the lowest visibility are January and February (3mi).

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