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
Transition into September subtly marks a drop in the average high-temperature, moderately moving from a warm 80.2°F (26.8°C) in August to a still moderately hot 73.4°F (23°C). Throughout September nights, a significant departure from daytime temperatures, with an average low of 44.6°F (7°C), is recognized in Chester.Humidity
In Chester, the average relative humidity in September is 47%.Rainfall
In Chester, in September, during 5.5 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. Throughout the year, in Chester, there are 98.1 rainfall days, and 32.99" (838mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. 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 Chester, the average length of the day in September 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, in Chester, sunrise is at 7:01 am and sunset at 6:48 pm PDT.
Sunshine
In Chester, the average sunshine in September is 11.1h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 4 translates into these guidelines:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Frequently asked questions
What is the temperature in September in Chester?
What is the average humidity in September in Chester?
How much does it rain in Chester in September?
When does it start snowing in Chester?
What is the average length of the day in September in Chester?
What time are sunrise and sunset in September in Chester?
How many hours of sunshine does Chester have in September?
What is the UV index reading in September in Chester?
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
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