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 start of September signals a gentle decrease in the average high-temperature, transitioning from an extremely hot 106.2°F (41.2°C) in August to a very hot 99.1°F (37.3°C). Imperial throughout September, records an average low-temperature of 79.9°F (26.6°C).Humidity
In Imperial, the average relative humidity in September is 26%.Rainfall
The months with the most rainfall are March, April, July through September and December, with an average 0.08" (2mm) of precipitation.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September, sunrise is at 6:17 am and sunset at 7:06 pm. On the last day of the month, sunrise is at 6:36 am and sunset at 6:27 pm PDT.
Sunshine
The average sunshine in September is 10.2h.UV index
The average daily maximum UV index in September is 8. A UV Index value of 8 to 10 symbolizes a very high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The average daily UV index of 8 in September transforms into the following instructions:
Be sure to take precautions. Without protection, skin might suffer damage quickly. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely.
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?
What is the rainiest month?
How much does it rain in September?
How many hours of daylight does Imperial have in September?
When are sunrise and sunset in September?
How long on average sun shines in September in Imperial?
How high is the UV index in September?
Average temperature in September
Imperial, CA
- Average high temperature in September: 99.1°F
The warmest month (with the highest average high temperature) is July (106.7°F).
The month with the lowest average high temperature is December (66.4°F).
- Average low temperature in September: 79.9°F
The month with the highest average low temperature is August (85.5°F).
The coldest month (with the lowest average low temperature) is January (49.8°F).
Average pressure in September
Imperial, CA
- Average pressure in September: 29.81"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.78"Hg).
Average wind speed in September
Imperial, CA
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is January (5.2mph).
Average humidity in September
Imperial, CA
- Average humidity in September: 26%
The month with the highest relative humidity is December (40%).
The month with the lowest relative humidity is June (21%).
Average rainfall in September
Imperial, CA
- Average rainfall in September: 0.08"
The wettest months (with the highest rainfall) are March, April, July, August, September and December (0.08").
The driest months (with the least rainfall) are May and June (0").
Average rainfall days in September
Imperial, CA
- Average rainfall days in September: 1.9 days
The month with the highest number of rainy days is July (2.8 days).
The month with the least rainy days is May (0.3 days).
Average daylight in September /
Average sunshine in September
Imperial, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 10h and 1min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 6min).
Average sunshine days in September
Imperial, CA
- Average sunshine days in September: 26.6 days
The month with the most sunshine days is May (30.4 days).
The month with the least sunshine days is August (25.8 days).
Average UV index in September
Imperial, CA
- Average UV index in September: 8
The months with the highest UV index are July and August (UV index 9).
The month with the lowest UV index is December (UV index 4).
Average cloud cover in September
Imperial, CA
- Average cloud cover in September: 6
The month with the most cloud cover is December (Cloud cover 17).
The month with the least cloud cover is June (Cloud cover 4).
Average visibility in September
Imperial, 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).
Imperial, California, USA
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