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 arrival of September signals a subtle shift in temperature, down from a very hot 96.8°F (36°C) in August to a hot 90.5°F (32.5°C). A striking departure from daytime highs to an average low-temperature of 61.9°F (16.6°C) is witnessed in Artois during September.Humidity
The average relative humidity in September is 33%.Rainfall
In Artois, California, in September, it is raining for 2.7 days, with typically 0.2" (5mm) of accumulated precipitation. Throughout the year, there are 82.1 rainfall days, and 17.24" (438mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:37 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm PDT.
Sunshine
In Artois, California, the average sunshine in September is 11.1h.UV index
In Artois, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for the average person.Note: A maximum daily UV index of 6 during September morphs into the following directions:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in Artois in September?
What is the average humidity in September in Artois?
How many days does it rain in September in Artois?
What is the average length of the day in September in Artois?
What time are sunrise and sunset in September in Artois?
How many hours of sunshine does Artois have in September?
How high is the UV index in September in Artois?
Average temperature in September
Artois, CA
- Average high temperature in September: 90.5°F
The warmest month (with the highest average high temperature) is July (98.4°F).
The month with the lowest average high temperature is December (54.9°F).
- Average low temperature in September: 61.9°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).
Average pressure in September
Artois, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Artois, CA
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is March (7.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in September
Artois, CA
- Average humidity in September: 33%
The month with the highest relative humidity is March (69%).
The months with the lowest relative humidity are July and August (32%).
Average rainfall in September
Artois, CA
- Average rainfall in September: 0.2"
The wettest month (with the highest rainfall) is February (3.19").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days in September
Artois, CA
- Average rainfall days in September: 2.7 days
The month with the highest number of rainy days is March (14.1 days).
The month with the least rainy days is July (1.6 days).
Average daylight in September /
Average sunshine in September
Artois, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Artois, CA
- Average sunshine days in September: 26.5 days
The month with the most sunshine days is July (29.5 days).
The month with the least sunshine days is March (16.1 days).
Average UV index in September
Artois, 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 February, November and December (UV index 3).
Average cloud cover in September
Artois, CA
- Average cloud cover in September: 8
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Artois, 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).
Artois, California, USA
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