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
July and September, with an average high-temperature of 80.1°F (26.7°C), are the warmest months.Humidity
September and October, with an average relative humidity of 60%, are the least humid months.Rainfall
In Vallejo, in September, during 2.1 rainfall days, 0.08" (2mm) of precipitation is typically accumulated. Throughout the year, there are 56.9 rainfall days, and 4.88" (124mm) of precipitation is accumulated.Daylight
The average length of the day in September in Vallejo is 12h and 25min.On the first day of September in Vallejo, California, sunrise is at 6:39 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm PDT.
Sunshine
The average sunshine in September in Vallejo, California, is 11.1h.UV index
In Vallejo, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: A maximum UV index of 5 in September translates into the following recommendations:
Ensure safety - Imperative it is to shield skin and eyes from damage. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Frequently asked questions
What month is the hottest in Vallejo?
What is the usual temperature for Vallejo in September?
What is the least humid month in Vallejo?
What is the average humidity in September in Vallejo?
How many days does it rain in September in Vallejo?
What is the average length of the day in September in Vallejo?
What time are sunrise and sunset in September in Vallejo?
How long on average sun shines in September in Vallejo?
What is the UV index reading in September in Vallejo?
Average temperature in September
Vallejo, CA
- Average high temperature in September: 80.1°F
The warmest months (with the highest average high temperature) are July and September (80.1°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is January (43°F).
Average pressure in September
Vallejo, 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 (29.91"Hg).
Average wind speed in September
Vallejo, CA
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).
Average humidity in September
Vallejo, CA
- Average humidity in September: 60%
The month with the highest relative humidity is March (75%).
The months with the lowest relative humidity are September and October (60%).
Average rainfall in September
Vallejo, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is February (1.14").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Vallejo, CA
- Average rainfall days in September: 2.1 days
The month with the highest number of rainy days is March (10.2 days).
The month with the least rainy days is August (0.9 days).
Average daylight in September /
Average sunshine in September
Vallejo, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
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 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Vallejo, CA
- Average sunshine days in September: 26 days
The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (18.8 days).
Average UV index in September
Vallejo, CA
- Average UV index in September: 5
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Vallejo, CA
- Average cloud cover in September: 11
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in September
Vallejo, 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).
Vallejo, California, USA
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