September weather forecastChattaroy, WA
September
Weather in September
September, the first month of the autumn in Chattaroy, is still a pleasant month, with an average temperature ranging between max 72.7°F (22.6°C) and min 46.6°F (8.1°C).Temperature
A shift in the average high-temperature occurs in September, reducing from a warm 84°F (28.9°C) in August to an agreeable 72.7°F (22.6°C). A sharp reduction from the daytime highs is witnessed during September, with nighttime temperatures averaging a low of 46.6°F (8.1°C).Humidity
In Chattaroy, the average relative humidity in September is 53%.Rainfall
In September, the rain falls for 7 days. Throughout September, 0.63" (16mm) of precipitation is accumulated. In Chattaroy, during the entire year, the rain falls for 124.9 days and collects up to 17.44" (443mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.51" (13mm) of snow. In Chattaroy, during the entire year, snow falls for 69.2 days and aggregates up to 42.99" (1092mm) of snow.Daylight
In Chattaroy, the average length of the day in September is 12h and 33min.On the first day of September, sunrise is at 6:08 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:29 pm PDT.
Sunshine
In Chattaroy, Washington, the average sunshine in September is 10.1h.UV index
The average daily maximum UV index in September in Chattaroy is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 4 suggests this advice:
Adopt protective measures - Suggestions to resist sunburn are offered. Direct Sun exposure should be minimized especially during midday when radiation is most intense. 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. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chattaroy, WA
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is August (84°F).
The month with the lowest average high temperature is December (31.3°F).
- Average low temperature in September: 46.6°F
The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is December (20.3°F).
Average pressure in September
Chattaroy, WA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in September
Chattaroy, WA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is April (5.6mph).
The calmest month (with the lowest average wind speed) is December (4mph).
Average humidity in September
Chattaroy, WA
- Average humidity in September: 53%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is August (43%).
Average rainfall in September
Chattaroy, WA
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is January (2.4").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in September
Chattaroy, WA
- Average rainfall days in September: 7 days
The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is August (5.1 days).
Average snowfall in September
Chattaroy, WA
- Average snowfall in September: 0.51"
The month with the highest snowfall is January (13.23").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Chattaroy, WA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (16.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Chattaroy, WA
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 10h and 6min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Chattaroy, WA
- Average sunshine days in September: 21.3 days
The month with the most sunshine days is July (24.2 days).
The month with the least sunshine days is March (9.7 days).
Average UV index in September
Chattaroy, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February, November and December (UV index 1).
Average cloud cover in September
Chattaroy, WA
- Average cloud cover in September: 22
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Chattaroy, WA
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).
