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 snowfall 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 temperatures reach their highest averages in September, with highs of 70.9°F (21.6°C) and lows of 56.3°F (13.5°C).Humidity
In September, the average relative humidity is 73%.Rainfall
In Fairfax, California, in September, it is raining for 3.4 days, with typically 0.12" (3mm) of accumulated precipitation. Throughout the year, there are 80.3 rainfall days, and 15.98" (406mm) of precipitation is accumulated.Snowfall
January through November are months without snowfall.Daylight
The average length of the day in September in Fairfax is 12h and 25min.On the first day of the month, sunrise is at 6:40 am and sunset at 7:39 pm. On the last day of September, in Fairfax, sunrise is at 7:05 am and sunset at 6:54 pm PDT.
Sunshine
In September, the average sunshine is 10.5h.UV index
June through September, with an average maximum UV index of 5, are months with the highest UV index in Fairfax. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Experience reduced UV exposure by about half when donning a wide-brim hat.
Frequently asked questions
What month is the hottest in Fairfax?
What is the usual temperature for Fairfax in September?
What is the average humidity in September in Fairfax?
How much does it rain in Fairfax in September?
When it does not snow in Fairfax?
How many hours of daylight does Fairfax have in September?
What time are sunrise and sunset in September in Fairfax?
How long on average sun shines in September in Fairfax?
When is the highest UV index in Fairfax?
How high is the UV index in September in Fairfax?
Average temperature in September
Fairfax, CA
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is September (70.9°F).
The month with the lowest average high temperature is December (55.2°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is September (56.3°F).
The coldest month (with the lowest average low temperature) is December (46°F).
Average pressure in September
Fairfax, 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
Fairfax, CA
- Average wind speed in September: 6.3mph
The windiest months (with the highest average wind speed) are April and May (8.3mph).
The calmest month (with the lowest average wind speed) is November (5.9mph).
Average humidity in September
Fairfax, CA
- Average humidity in September: 73%
The month with the highest relative humidity is August (78%).
The month with the lowest relative humidity is October (69%).
Average rainfall in September
Fairfax, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is February (3.43").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days in September
Fairfax, CA
- Average rainfall days in September: 3.4 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is July (2.3 days).
Average snowfall days in September
Fairfax, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Fairfax, 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: 10h and 3min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in September
Fairfax, CA
- Average sunshine days in September: 24.1 days
The months with the most sunshine days are June and July (24.8 days).
The month with the least sunshine days is March (16.6 days).
Average UV index in September
Fairfax, CA
- Average UV index in September: 5
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in September
Fairfax, CA
- Average cloud cover in September: 19
The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 19).
Average visibility in September
Fairfax, 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).
Fairfax, California, USA
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