September weather forecastManson, WA
September
Weather in September
September, the first month of the autumn in Manson, is also an agreeable month, with an average temperature fluctuating between 70.5°F (21.4°C) and 49.1°F (9.5°C).Temperature
As September arrives, Manson's weather displays a decrease in high-temperatures, transitioning from August's warm 81.9°F (27.7°C) to a pleasant 70.5°F (21.4°C). Manson's temperature tends to fall to an average low of 49.1°F (9.5°C) during the nights of September.Humidity
In Manson, Washington, the average relative humidity in September is 52%.Rainfall
In Manson, Washington, in September, it is raining for 6.7 days, with typically 0.55" (14mm) of accumulated precipitation. In Manson, during the entire year, the rain falls for 99.9 days and collects up to 10.47" (266mm) of precipitation.Snowfall
January through April, September through December are months with snowfall in Manson. September is the first month it typically snows in Manson. Throughout September, in the average 0.3 snowfall days, it receives 0.71" (18mm) of snow. In Manson, during the entire year, snow falls for 48.7 days and aggregates up to 28.62" (727mm) of snow.Daylight
The average length of the day in September is 12h and 33min.On the first day of September in Manson, sunrise is at 6:20 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:41 pm PDT.
Sunshine
In Manson, the average sunshine in September is 10.7h.UV index
In Manson, Washington, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 4 during September leads to these advisories:
Exercise prevention - Warding off sunburn is urged. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Manson, WA
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is December (30.2°F).
- Average low temperature in September: 49.1°F
The month with the highest average low temperature is August (55.8°F).
The coldest months (with the lowest average low temperature) are January and December (19°F).
Average pressure in September
Manson, WA
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed in September
Manson, WA
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is June (6.1mph).
The calmest months (with the lowest average wind speed) are January and December (3.5mph).
Average humidity in September
Manson, WA
- Average humidity in September: 52%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are July and August (43%).
Average rainfall in September
Manson, WA
- Average rainfall in September: 0.55"
The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in September
Manson, WA
- Average rainfall days in September: 6.7 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (3.8 days).
Average snowfall in September
Manson, WA
- Average snowfall in September: 0.71"
The month with the highest snowfall is December (9.06").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in September
Manson, WA
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is January (12 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Manson, 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 42min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Manson, WA
- Average sunshine days in September: 21.7 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is March (13.2 days).
Average UV index in September
Manson, 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 January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Manson, WA
- Average cloud cover in September: 19
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Manson, WA
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
