September weather forecast and climate
Gridley, CA

Weather in September

September, the first month of the autumn, in Gridley, is still a hot month, with average temperature varying between 89.2°F (31.8°C) and 60.8°F (16°C).

Temperature

In Gridley, the average high-temperature slightly decreases, from a sweltering 95.2°F (35.1°C) in August, to a hot 89.2°F (31.8°C). In September, in Gridley, the average low-temperature is 60.8°F (16°C).

Humidity

In Gridley, the average relative humidity is 36%.

Rainfall

In September, the rain falls for 2.1 days. Throughout September, 0.24" (6mm) of precipitation is accumulated. In Gridley, during the entire year, the rain falls for 81.5 days and collects up to 21.34" (542mm) of precipitation.

Snowfall

March through December are months without snowfall in Gridley, California.

Daylight

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

Sunshine

In Gridley, the average sunshine in September is 11.2h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Gridley?

The average high-temperature, in September, in Gridley, is 89.2°F (31.8°C), while the average low-temperature is 60.8°F (16°C).

What is the average humidity in September in Gridley?

The average relative humidity in September in Gridley, California, is 36%.

How much does it rain in Gridley in September?

In Gridley, California, in September, during 2.1 rainfall days, 0.24" (6mm) of precipitation is typically accumulated.

When it does not snow in Gridley?

March through December are months without snowfall in Gridley, California.

How many hours of daylight does Gridley have in September?

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

How long on average sun shines in September in Gridley?

In September, the average sunshine is 11.2h.

What is the UV index intensity in September in Gridley?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Gridley, CA

Average temperature in September - Gridley, CA
  • Average high temperature in September: 89.2°F

The warmest month (with the highest average high temperature) is July (96.4°F).
The month with the lowest average high temperature is December (54.5°F).

  • Average low temperature in September: 60.8°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is December (41°F).

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Average pressure in September
Gridley, CA

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

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in September
Gridley, CA

Average wind speed in September - Gridley, CA
  • Average wind speed in September: 4.7mph

The windiest month (with the highest average wind speed) is March (6.1mph).
The calmest month (with the lowest average wind speed) is September (4.7mph).

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Average humidity in September
Gridley, CA

Average humidity in September - Gridley, CA
  • Average humidity in September: 36%

The month with the highest relative humidity is March (72%).
The month with the lowest relative humidity is July (35%).

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Average rainfall in September
Gridley, CA

Average rainfall in September - Gridley, CA
  • Average rainfall in September: 0.24"

The wettest months (with the highest rainfall) are February and March (3.98").
The driest month (with the least rainfall) is July (0.04").

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Average rainfall days in September
Gridley, CA

Average rainfall days in September - Gridley, CA
  • Average rainfall days in September: 2.1 days

The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is July (1.4 days).

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Average snowfall in September
Gridley, CA

Average snowfall in September - Gridley, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.4").
Months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Gridley, CA

Average snowfall days in September - Gridley, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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

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

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 11.2h

The month with the most sunshine is July (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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Average sunshine days in September
Gridley, CA

Average sunshine days in September - Gridley, CA
  • Average sunshine days in September: 27 days

The month with the most sunshine days is July (29.1 days).
The month with the least sunshine days is March (16 days).

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Average UV index in September
Gridley, CA

Average UV index in September - Gridley, CA
  • Average UV index in September: 5

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
Gridley, CA

Average cloud cover in September - Gridley, CA
  • Average cloud cover in September: 8

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in September
Gridley, CA

Average visibility in September - Gridley, 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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