Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The average high-temperature during September registers at a refreshing 64.8°F (18.2°C), closely corresponding to the preceding month. During September, Custer's temperature falls to a steady low-temperature average of 52°F (11.1°C).Humidity
The average relative humidity in September is 79%.Rainfall
In Custer, Washington, in September, during 12.8 rainfall days, 2.36" (60mm) of precipitation is typically accumulated. Throughout the year, in Custer, there are 176.1 rainfall days, and 43.78" (1112mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Custer.Daylight
The average length of the day in September in Custer is 12h and 34min.On the first day of the month, sunrise is at 6:28 am and sunset at 7:52 pm. On the last day of September, in Custer, sunrise is at 7:09 am and sunset at 6:50 pm PDT.
Sunshine
In Custer, the average sunshine in September is 8.9h.UV index
In September, the average daily maximum UV index in Custer is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: An average maximum UV index of 3 in September leads to these recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Frequently asked questions
What is the usual temperature for Custer in September?
What is the average humidity in September in Custer?
How much does it rain in Custer in September?
When it does not snow in Custer?
What is the average length of the day in September in Custer?
When is the sunrise / sunset in September in Custer?
How many hours of sunshine does Custer have in September?
What is the UV index reading in September in Custer?
Average temperature in September
Custer, WA
- Average high temperature in September: 64.8°F
The warmest month (with the highest average high temperature) is August (70°F).
The month with the lowest average high temperature is December (41.9°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is August (54.9°F).
The coldest month (with the lowest average low temperature) is February (35.8°F).
Average pressure in September
Custer, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is March (30"Hg).
Average wind speed in September
Custer, WA
- Average wind speed in September: 4.3mph
The windiest months (with the highest average wind speed) are November and December (6.3mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in September
Custer, WA
- Average humidity in September: 79%
The months with the highest relative humidity are January and November (83%).
The month with the lowest relative humidity is July (74%).
Average rainfall in September
Custer, WA
- Average rainfall in September: 2.36"
The wettest month (with the highest rainfall) is November (7.13").
The driest month (with the least rainfall) is July (0.67").
Average rainfall days in September
Custer, WA
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.1 days).
Average snowfall in September
Custer, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Custer, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Custer, WA
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in September: 8h and 5min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and December (Average sunshine: 3h and 54min).
Average sunshine days in September
Custer, WA
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is August (23.2 days).
The month with the least sunshine days is November (8.8 days).
Average UV index in September
Custer, WA
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Custer, WA
- Average cloud cover in September: 35
The months with the most cloud cover are January and December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
Custer, WA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Custer, Washington, USA
Weather forecast for your location
2. Allow the app to use your location
