September weather forecastThree Rivers, CA
September
Weather in September
September, the first month of the autumn in Three Rivers, is also a hot month, with an average temperature fluctuating between 88.7°F (31.5°C) and 60.6°F (15.9°C).Temperature
September is marked by a subtle drop in average high-temperatures, transitioning from a fiery hot 95°F (35°C) in August to a tropical 88.7°F (31.5°C). Three Rivers experiences a dramatic descent in temperature during September, with the average nighttime reading settling at a refreshing 60.6°F (15.9°C).Humidity
In Three Rivers, the average relative humidity in September is 32%.Rainfall
In September, the rain falls for 1.8 days. Throughout September, 0.12" (3mm) of precipitation is accumulated. In Three Rivers, during the entire year, the rain falls for 55.9 days and collects up to 11.65" (296mm) of precipitation.Daylight
In Three Rivers, California, the average length of the day in September is 12h and 24min.On the first day of September in Three Rivers, sunrise is at 6:27 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:40 pm PDT.
Sunshine
The average sunshine in September is 11.1h.UV index
The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index, 6 in September, converts into the following recommendations:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Three Rivers, 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
Three Rivers, 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
Three Rivers, 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
Three Rivers, 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
Three Rivers, 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
Three Rivers, 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
Three Rivers, 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
Three Rivers, 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
Three Rivers, 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
Three Rivers, 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
Three Rivers, 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).
