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 slightly decreases in September, shifting from a moderately hot 80.2°F (26.8°C) in August to a still warm 73.4°F (23°C). September nights indicate a noticeable temperature drop from the daytime highs, with an average reading lowering to a chilly 44.6°F (7°C).Humidity
The average relative humidity in September in Chester is 47%.Rainfall
In Chester, during September, the rain falls for 5.5 days and regularly aggregates up to 0.67" (17mm) of precipitation. In Chester, during the entire year, the rain falls for 98.1 days and collects up to 32.99" (838mm) of precipitation.Snowfall
January through June, 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 0.47" (12mm) of snow. Throughout the year, in Chester, there are 66 snowfall days, and 127.72" (3244mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:48 pm PDT.
Sunshine
In September, the average sunshine is 11.1h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: An average maximum UV index of 4 in September leads to these recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Chester in September?
What is the average humidity in September?
How much does it rain in September?
When does it start to snow?
How many hours of daylight does Chester have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Chester, CA
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in September: 44.6°F
The month with the highest average low temperature is July (49.5°F).
The coldest month (with the lowest average low temperature) is December (24.1°F).
Average pressure in September
Chester, CA
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Chester, CA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is March (6.7mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Chester, CA
- Average humidity in September: 47%
The month with the highest relative humidity is March (83%).
The month with the lowest relative humidity is July (42%).
Average rainfall in September
Chester, CA
- Average rainfall in September: 0.67"
The wettest month (with the highest rainfall) is March (5.59").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Chester, CA
- Average rainfall days in September: 5.5 days
The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is August (4 days).
Average snowfall in September
Chester, CA
- Average snowfall in September: 0.47"
The month with the highest snowfall is March (27.05").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Chester, CA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is March (14 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Chester, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in September
Chester, CA
- Average sunshine days in September: 23.1 days
The month with the most sunshine days is August (25 days).
The month with the least sunshine days is March (10.9 days).
Average UV index in September
Chester, CA
- 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 and November (UV index 1).
Average cloud cover in September
Chester, CA
- Average cloud cover in September: 12
The month with the most cloud cover is March (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 7).
Average visibility in September
Chester, CA
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Chester, California, USA
Weather forecast for your location
2. Allow the app to use your location