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
Irvine commences September with an average high-temperature of a still moderately hot 79°F (26.1°C), maintaining a close resemblance to the previous month. In the month of September, the average temperature in Irvine dips to a comfortable 64.4°F (18°C) during the night.Humidity
The average relative humidity in September is 64%.Rainfall
In Irvine, in September, during 4.1 rainfall days, 0.31" (8mm) of precipitation is typically accumulated. Throughout the year, in Irvine, California, there are 63.7 rainfall days, and 7.91" (201mm) of precipitation is accumulated.Daylight
In Irvine, the average length of the day in September is 12h and 22min.On the first day of September, sunrise is at 6:25 am and sunset at 7:16 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:36 pm PDT.
Sunshine
The average sunshine in September is 10.6h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 6 in September translates into this advice:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Frequently asked questions
What is the average September temperature in Irvine?
What is the average humidity in September in Irvine?
How much does it rain in Irvine in September?
What is the average length of the day in September in Irvine?
When is the sunrise / sunset in September in Irvine?
How many hours of sunshine does Irvine have in September?
What are the months with the highest UV index in Irvine?
How high is the UV index in September in Irvine?
Average temperature in September
Irvine, CA
- Average high temperature in September: 79°F
The warmest month (with the highest average high temperature) is August (79.9°F).
The month with the lowest average high temperature is December (63°F).
- Average low temperature in September: 64.4°F
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (50.5°F).
Average pressure in September
Irvine, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Irvine, CA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are September and October (4.8mph).
Average humidity in September
Irvine, CA
- Average humidity in September: 64%
The month with the highest relative humidity is June (71%).
The month with the lowest relative humidity is November (56%).
Average rainfall in September
Irvine, CA
- Average rainfall in September: 0.31"
The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Irvine, CA
- Average rainfall days in September: 4.1 days
The month with the highest number of rainy days is March (7.9 days).
The month with the least rainy days is June (2.2 days).
Average daylight in September /
Average sunshine in September
Irvine, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 10h and 4min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in September
Irvine, CA
- Average sunshine days in September: 22.1 days
The month with the most sunshine days is January (24.5 days).
The month with the least sunshine days is May (19.7 days).
Average UV index in September
Irvine, CA
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in September
Irvine, CA
- Average cloud cover in September: 10
The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in September
Irvine, 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).
Irvine, California, USA
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