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 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 advent of September brings a slight shift in average high-temperature, moving from a very hot 99.9°F (37.7°C) in August to a tropical 92.7°F (33.7°C). September nights present a sharp contrast to daytime highs, with average temperatures of 63.5°F (17.5°C).Humidity
In San Joaquin, the average relative humidity in September is 34%.Rainfall
The months with the least rainfall are June through September Rain falls for 0.5 days and accumulates 0.04" (1mm) of rain.Daylight
In San Joaquin, the average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:45 pm PDT.
Sunshine
In September, the average sunshine is 11.3h.UV index
In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum high UV index of 6 in September translates into the following recommendations:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
San Joaquin, CA
- Average high temperature in September: 92.7°F
The warmest month (with the highest average high temperature) is July (100.9°F).
The month with the lowest average high temperature is December (56.5°F).
- Average low temperature in September: 63.5°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is December (42.6°F).
Average pressure in September
San Joaquin, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
San Joaquin, CA
- Average wind speed in September: 6.1mph
The windiest month (with the highest average wind speed) is June (7.6mph).
The calmest month (with the lowest average wind speed) is January (5.1mph).
Average humidity in September
San Joaquin, CA
- Average humidity in September: 34%
The months with the highest relative humidity are January and December (66%).
The month with the lowest relative humidity is July (30%).
Average rainfall in September
San Joaquin, CA
- Average rainfall in September: 0.04"
The wettest months (with the highest rainfall) are February and March (0.43").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in September
San Joaquin, CA
- Average rainfall days in September: 0.5 days
The month with the highest number of rainy days is March (7 days).
The months with the least rainy days are August and September (0.5 days).
Average daylight in September /
Average sunshine in September
San Joaquin, CA
- Average daylight in September: 12h and 2min
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 2min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The months with the least sunshine are February and December (Average sunshine: 6h and 24min).
Average sunshine days in September
San Joaquin, CA
- Average sunshine days in September: 28.9 days
The month with the most sunshine days is August (29.7 days).
The month with the least sunshine days is February (22 days).
Average UV index in September
San Joaquin, 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, November and December (UV index 3).
Average cloud cover in September
San Joaquin, CA
- Average cloud cover in September: 5
The month with the most cloud cover is March (Cloud cover 29).
The months with the least cloud cover are July and August (Cloud cover 4).
Average visibility in September
San Joaquin, 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).
San Joaquin, California, USA
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