September weather forecast
Fresno, CA

The artificial Millerton Lake near Fresno in California
The artificial Millerton Lake near Fresno in California

Weather in September

September, the first month of the autumn in Fresno, is also a hot month, with an average temperature fluctuating between 91.8°F (33.2°C) and 63.3°F (17.4°C).

Temperature

In September, the average high-temperature slightly decreases from a very hot 98.2°F (36.8°C) in August to a hot 91.8°F (33.2°C). The average low-temperature, in Fresno, California, is 63.3°F (17.4°C).

Humidity

In September, the average relative humidity is 31%.

Rainfall

In Fresno, during September, the rain falls for 2.4 days and regularly aggregates up to 0.16" (4mm) of precipitation. Throughout the year, in Fresno, California, there are 59.3 rainfall days, and 10.43" (265mm) of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 24min.
On the first day of September, sunrise is at 6:30 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:44 pm PDT.

Sunshine

In September, the average sunshine is 11.2h.

UV index

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Fresno?

In September, the average relative humidity in Fresno, California, is 31%.

How many days does it rain in September in Fresno?

In Fresno, California, during September, the rain falls for 2.4 days and regularly aggregates up to 0.16" (4mm) of precipitation.

How many hours of daylight does Fresno have in September?

In September, the average day length in Fresno is 12h and 24min.

When are sunrise and sunset in September in Fresno?

On the first day of September in Fresno, California, sunrise is at 6:30 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:44 pm PDT.

How many hours of sunshine does Fresno have in September?

In September, the average sunshine duration in Fresno, California, is 11.2h.

How high is the UV index in September in Fresno?

In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.

Average temperature in September
Fresno, CA

Average temperature in September - Fresno, CA
  • Average high temperature in September: 91.8°F

The warmest month (with the highest average high temperature) is July (99.7°F).
The month with the lowest average high temperature is December (56.1°F).

  • Average low temperature in September: 63.3°F

The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).

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Average pressure in September
Fresno, CA

Average pressure in September - Fresno, CA
  • Average pressure in September: 29.92"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in September
Fresno, CA

Average wind speed in September - Fresno, CA
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is June (5.8mph).
The calmest month (with the lowest average wind speed) is November (3.8mph).

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Average humidity in September
Fresno, CA

Average humidity in September - Fresno, CA
  • Average humidity in September: 31%

The month with the highest relative humidity is January (65%).
The month with the lowest relative humidity is July (28%).

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Average rainfall in September
Fresno, CA

Average rainfall in September - Fresno, CA
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is March (2.01").
The driest months (with the least rainfall) are June and August (0.08").

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Average rainfall days in September
Fresno, CA

Average rainfall days in September - Fresno, CA
  • Average rainfall days in September: 2.4 days

The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is August (1.2 days).

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Average daylight in September /
Average sunshine in September
Fresno, CA

Average daylight in September / Average sunshine in September - Fresno, CA
  • Average daylight in September: 12h and 24min

The month with the longest days is June (Average daylight: 14h and 38min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in September: 11.2h

The months with the most sunshine are June, July and August (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.5h).

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Average sunshine days in September
Fresno, CA

Average sunshine days in September - Fresno, CA
  • Average sunshine days in September: 26.8 days

The month with the most sunshine days is August (28.2 days).
The month with the least sunshine days is March (19.5 days).

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Average UV index in September
Fresno, CA

Average UV index in September - Fresno, 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 January, November and December (UV index 3).

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Average cloud cover in September
Fresno, CA

Average cloud cover in September - Fresno, CA
  • Average cloud cover in September: 6

The month with the most cloud cover is March (Cloud cover 27).
The month with the least cloud cover is August (Cloud cover 4).

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Average visibility in September
Fresno, CA

Average visibility in September - Fresno, 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).

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