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
As August transitions into September, the average high-temperature in San Jose, California, rests at a still moderately hot 79.7°F (26.5°C), maintaining a close resemblance to the previous month. During September, San Jose notes a substantial drop from the daytime peak to an average minimum temperature of 55.6°F (13.1°C).Humidity
July and September, with an average relative humidity of 60%, are the least humid months in San Jose.Rainfall
In September, in San Jose, the rain falls for 2.1 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. In San Jose, during the entire year, the rain falls for 51.5 days and collects up to 4.06" (103mm) of precipitation.Daylight
The average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 6:38 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm PDT.
Sunshine
The average sunshine in September is 11.2h.UV index
The average daily maximum UV index in September in San Jose is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Frequently asked questions
What is the average September temperature in San Jose?
What is the least humid month in San Jose?
What is the average humidity in September in San Jose?
How many days does it rain in September in San Jose?
What is the average length of the day in September in San Jose?
When are sunrise and sunset in September in San Jose?
How long on average sun shines in September in San Jose?
What is the UV index reading in September in San Jose?
Average temperature in September
San Jose, CA
- Average high temperature in September: 79.7°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is December (56.5°F).
- Average low temperature in September: 55.6°F
The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is December (43°F).
Average pressure in September
San Jose, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in September
San Jose, CA
- Average wind speed in September: 4.4mph
The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest months (with the lowest average wind speed) are September and October (4.4mph).
Average humidity in September
San Jose, CA
- Average humidity in September: 60%
The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are July and September (60%).
Average rainfall in September
San Jose, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is March (0.83").
The driest months (with the least rainfall) are June, July and August (0.04").
Average rainfall days in September
San Jose, CA
- Average rainfall days in September: 2.1 days
The month with the highest number of rainy days is March (9.8 days).
The month with the least rainy days is August (0.4 days).
Average daylight in September /
Average sunshine in September
San Jose, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- 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 December (Average sunshine: 6h and 0min).
Average sunshine days in September
San Jose, CA
- Average sunshine days in September: 26.8 days
The month with the most sunshine days is August (29.7 days).
The month with the least sunshine days is March (19.5 days).
Average UV index in September
San Jose, CA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
San Jose, CA
- Average cloud cover in September: 10
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility in September
San Jose, 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 Jose, California, USA
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