September weather forecastExeter, CA
September
Weather in September
September, the first month of the autumn in Exeter, is also a hot month, with an average temperature varying between 60.6°F (15.9°C) and 88.7°F (31.5°C).Temperature
September ushers in a minor alteration in Exeter's climate, with the average high-temperature moving from August's sweltering 95°F (35°C) to a hot 88.7°F (31.5°C). Against the high September temperatures, Exeter records an average drop to a refreshing 60.6°F (15.9°C) at night.Humidity
The average relative humidity in September is 32%.Rainfall
In Exeter, during September, the rain falls for 1.8 days and regularly aggregates up to 0.12" (3mm) of precipitation. Throughout the year, there are 55.9 rainfall days, and 11.65" (296mm) of precipitation is accumulated.Daylight
In Exeter, California, the average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:28 am and sunset at 7:23 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:40 pm PDT.
Sunshine
In September, the average sunshine is 11.1h.UV index
In Exeter, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index of 6 during September translates into the following directions:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Exeter, CA
- Average high temperature in September: 88.7°F
The warmest month (with the highest average high temperature) is July (95.5°F).
The month with the lowest average high temperature is December (56.3°F).
- Average low temperature in September: 60.6°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is December (39.7°F).
Average pressure in September
Exeter, CA
- Average pressure in September: 29.91"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Exeter, CA
- Average wind speed in September: 4.1mph
The windiest month (with the highest average wind speed) is June (4.6mph).
The calmest month (with the lowest average wind speed) is December (3.3mph).
Average humidity in September
Exeter, CA
- Average humidity in September: 32%
The month with the highest relative humidity is January (63%).
The month with the lowest relative humidity is August (29%).
Average rainfall in September
Exeter, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is March (2.32").
The driest months (with the least rainfall) are June, July and August (0.04").
Average rainfall days in September
Exeter, CA
- Average rainfall days in September: 1.8 days
The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (1 days).
Average daylight in September /
Average sunshine in September
Exeter, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 11h and 6min
The months with the most sunshine are June and July (Average sunshine: 12h and 12min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).
Average sunshine days in September
Exeter, CA
- Average sunshine days in September: 27.5 days
The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is March (19.8 days).
Average UV index in September
Exeter, CA
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Exeter, CA
- Average cloud cover in September: 4
The month with the most cloud cover is March (Cloud cover 22).
The months with the least cloud cover are July, August and September (Cloud cover 4).
Average visibility in September
Exeter, CA
- 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).
