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 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 start of September involves a subtle temperature drop, shifting from a hot 91.4°F (33°C) in August to a moderately hot 85.5°F (29.7°C). A sharp reduction from the daytime highs is witnessed during September, with nighttime temperatures averaging a low of 59°F (15°C).Humidity
The average relative humidity in September is 36%.Rainfall
In Challenge, during September, the rain falls for 2.8 days and regularly aggregates up to 0.43" (11mm) of precipitation. In Challenge, during the entire year, the rain falls for 88.4 days and collects up to 30.35" (771mm) of precipitation.Snowfall
January, March through October are months without snowfall.Daylight
In Challenge, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:35 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:48 pm PDT.
Sunshine
In September, the average sunshine is 11.2h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Challenge have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Challenge have in September?
What is the UV index intensity in September?
Average temperature in September
Challenge, CA
- Average high temperature in September: 85.5°F
The warmest month (with the highest average high temperature) is July (92.5°F).
The month with the lowest average high temperature is December (52.5°F).
- Average low temperature in September: 59°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is December (38.1°F).
Average pressure in September
Challenge, 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
Challenge, CA
- Average wind speed in September: 5.7mph
The windiest months (with the highest average wind speed) are February, March and April (6.2mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in September
Challenge, CA
- Average humidity in September: 36%
The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are July and August (34%).
Average rainfall in September
Challenge, CA
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is March (6.02").
The driest month (with the least rainfall) is July (0.04").
Average rainfall days in September
Challenge, CA
- Average rainfall days in September: 2.8 days
The month with the highest number of rainy days is March (15.5 days).
The month with the least rainy days is July (1.4 days).
Average snowfall in September
Challenge, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.43").
The months with the least snowfall are January, March, April, May, June, July, August, September and October (0").
Average snowfall days in September
Challenge, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.6 days).
The months with the least snowfall days are January, April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Challenge, 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 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Challenge, CA
- Average sunshine days in September: 25.9 days
The month with the most sunshine days is July (28.3 days).
The month with the least sunshine days is March (14.5 days).
Average UV index in September
Challenge, CA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Challenge, CA
- Average cloud cover in September: 9
The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Challenge, 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).
Challenge, California, USA
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