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 advent of September brings an average high-temperature of a warm 85.1°F (29.5°C), exhibiting minor difference from the previous month. September nights show a substantial disparity from the daytime peak with an average low-temperature of 57.6°F (14.2°C).Heat index
September's heat index is appraised at a hot 87.8°F (31°C). Enduring exposure and continuous activity might cause a feeling of tiredness and induce heat cramps.Heat index evaluations are typically in the context of light winds and shaded environments. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a numerical representation of warmth when taking temperature and moisture levels into account. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.
Humidity
With an average relative humidity of 52%, September is the least humid month.Rainfall
January through July, September through December are months with rainfall. September is the first month it rains in Fairfield. Throughout September, in the average 1.7 rainfall days, it receives 0.08" (2mm) of precipitation. Throughout the year, in Fairfield, there are 71.4 rainfall days, and 12.13" (308mm) of precipitation is accumulated.Daylight
The average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 6:38 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm PDT.
Sunshine
In September, the average sunshine is 11.1h.UV index
In Fairfield, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, a regular UV index of 5 translates into these guidelines:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. To protect against the Sun's most potent rays, avoid direct exposure around midday. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the least humid month in Fairfield?
What is the average humidity in September?
When does it start raining?
How many hours of daylight does Fairfield have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Fairfield, CA
- Average high temperature in September: 85.1°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is December (54.9°F).
- Average low temperature in September: 57.6°F
The month with the highest average low temperature is September (57.6°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).
Average pressure in September
Fairfield, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in September
Fairfield, CA
- Average wind speed in September: 5.6mph
The windiest months (with the highest average wind speed) are May, June and July (7mph).
The calmest months (with the lowest average wind speed) are January and November (4.5mph).
Average humidity in September
Fairfield, CA
- Average humidity in September: 52%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (52%).
Average rainfall in September
Fairfield, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is February (2.4").
The driest month (with the least rainfall) is August (0").
Average rainfall days in September
Fairfield, CA
- Average rainfall days in September: 1.7 days
The month with the highest number of rainy days is March (12.9 days).
The month with the least rainy days is August (0.7 days).
Average daylight in September /
Average sunshine in September
Fairfield, 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: 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
Fairfield, CA
- Average sunshine days in September: 27.5 days
The month with the most sunshine days is August (30.2 days).
The month with the least sunshine days is March (17 days).
Average UV index in September
Fairfield, CA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Fairfield, CA
- Average cloud cover in September: 9
The months with the most cloud cover are March and December (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 5).
Average visibility in September
Fairfield, 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).
Fairfield, California, USA
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