September weather forecast and climate
Mendota, CA

Weather in September

September, the first month of the autumn, in Mendota, is still a tropical month, with temperature in the range of an average low of 63°F (17.2°C) and an average high of 91.6°F (33.1°C).

Temperature

In Mendota, the average high-temperature in September slightly decreases, from a sweltering 98.2°F (36.8°C) in August, to a hot 91.6°F (33.1°C). In September, the average low-temperature is 63°F (17.2°C).

Humidity

The average relative humidity in September is 35%.

Rainfall

Months with rainfall are January through July, September through December. September is the first month it rains. Throughout September, in the average 1.5 rainfall days, it receives 0.08" (2mm) of precipitation. In Mendota, during the entire year, the rain falls for 59.3 days and collects up to 8.86" (225mm) of precipitation.

Daylight

In Mendota, the average length of the day in September is 12.4h.

Sunshine

In Mendota, the average sunshine is 11.4h.

UV index

In Mendota, California, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Mendota?

The average high-temperature, in September, in Mendota, is 91.6°F (33.1°C), while the average low-temperature is 63°F (17.2°C).

What is the average humidity in September in Mendota?

In Mendota, the average relative humidity in September is 35%.

When does it start to rain in Mendota?

September is the first month it rains in Mendota. Throughout September, in the average 1.5 rainfall days, it receives 0.08" (2mm) of precipitation.

How many hours of daylight does Mendota have in September?

In Mendota, the average length of the day in September is 12.4h.

How many hours of sunshine does Mendota have in September?

In Mendota, California, the average sunshine in September is 11.4h.

What is the UV index reading in September in Mendota?

The average daily maximum UV index in September in Mendota, California, is 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Mendota, CA

Average temperature in September - Mendota, CA
  • Average high temperature in September: 91.6°F

The warmest month (with the highest average high temperature) is July (99.9°F).
The month with the lowest average high temperature is December (55.9°F).

  • Average low temperature in September: 63°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is December (42.3°F).

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Average pressure in September
Mendota, CA

Average pressure in September - Mendota, CA
  • Average pressure in September: 29.92"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Mendota, CA

Average wind speed in September - Mendota, CA
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is June (7.6mph).
The calmest month (with the lowest average wind speed) is January (4.8mph).

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Average humidity in September
Mendota, CA

Average humidity in September - Mendota, CA
  • Average humidity in September: 35%

The month with the highest relative humidity is January (67%).
The month with the lowest relative humidity is July (31%).

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Average rainfall in September
Mendota, CA

Average rainfall in September - Mendota, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is March (1.69").
The driest month (with the least rainfall) is August (0").

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Average rainfall days in September
Mendota, CA

Average rainfall days in September - Mendota, CA
  • Average rainfall days in September: 1.5 days

The month with the highest number of rainy days is March (11.4 days).
The month with the least rainy days is August (0.6 days).

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

Average daylight in September / Average sunshine in September - Mendota, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 11.4h

The month with the most sunshine is July (Average sunshine: 12.2h).
Months with the least sunshine are February and December (Average sunshine: 6.4).

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Average sunshine days in September
Mendota, CA

Average sunshine days in September - Mendota, CA
  • Average sunshine days in September: 27.4 days

The month with the most sunshine days is August (29.8 days).
The month with the least sunshine days is March (18.7 days).

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Average UV index in September
Mendota, CA

Average UV index in September - Mendota, CA
  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Mendota, CA

Average cloud cover in September - Mendota, CA
  • Average cloud cover in September: 5

Months with the most cloud cover are March and December (Cloud cover 29).
Months with the least cloud cover are July and August (Cloud cover 4).

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Average visibility in September
Mendota, CA

Average visibility in September - Mendota, CA
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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