September weather forecastBelmont, WA
September
Weather in September
September, the first month of the autumn in Belmont, is also an agreeable month, with an average temperature ranging between min 52.9°F (11.6°C) and max 73.2°F (22.9°C).Temperature
September comes with a drop in the average high-temperature, falling from August's moderately hot 83.5°F (28.6°C) to a pleasant 73.2°F (22.9°C). Nighttime temperatures in September average to a cool 52.9°F (11.6°C).Humidity
The average relative humidity in September is 46%.Rainfall
In Belmont, in September, during 6.4 rainfall days, 0.47" (12mm) of precipitation is typically accumulated. In Belmont, during the entire year, the rain falls for 120.2 days and collects up to 14.69" (373mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Belmont. September is the first month it typically snows in Belmont. Throughout September, in the average 0.1 snowfall days, it receives 0.2" (5mm) of snow. In Belmont, during the entire year, snow falls for 39.6 days and aggregates up to 22.68" (576mm) of snow.Daylight
In Belmont, the average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:09 am and sunset at 7:27 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:29 pm PDT.
Sunshine
The average sunshine in September in Belmont is 10.3h.UV index
In September, the average daily maximum UV index in Belmont is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Belmont, WA
- Average high temperature in September: 73.2°F
The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (34.7°F).
- Average low temperature in September: 52.9°F
The month with the highest average low temperature is August (60.4°F).
The coldest month (with the lowest average low temperature) is December (24.6°F).
Average pressure in September
Belmont, WA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in September
Belmont, WA
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in September
Belmont, WA
- Average humidity in September: 46%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (37%).
Average rainfall in September
Belmont, WA
- Average rainfall in September: 0.47"
The wettest month (with the highest rainfall) is December (1.93").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in September
Belmont, WA
- Average rainfall days in September: 6.4 days
The month with the highest number of rainy days is April (14.6 days).
The month with the least rainy days is July (4.5 days).
Average snowfall in September
Belmont, WA
- Average snowfall in September: 0.2"
The month with the highest snowfall is February (6.69").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Belmont, WA
- Average snowfall days in September: 0.1 days
The months with the highest number of snowfall days are February and December (9.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Belmont, WA
- Average daylight in September: 12h and 30min
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 September: 10h and 18min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 4h and 36min).
Average sunshine days in September
Belmont, WA
- Average sunshine days in September: 22.4 days
The month with the most sunshine days is July (24.6 days).
The month with the least sunshine days is February (12.2 days).
Average UV index in September
Belmont, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Belmont, WA
- Average cloud cover in September: 19
The months with the most cloud cover are January and December (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in September
Belmont, WA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
