September weather forecast and climate
Cobb, CA

Weather in September

September, the first month of the autumn, in Cobb, is also a moderately hot month, with average temperature varying between 55.8°F (13.2°C) and 85.1°F (29.5°C).

Temperature

In Cobb, the average high-temperature is practically the same as in August - a warm 85.1°F (29.5°C). The average low-temperature, in September, is 55.8°F (13.2°C).

Heat index

The average heat index is calculated to 85.5°F (29.7°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, wind, pregnancy), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in Cobb is 45%.

Rainfall

In September, the rain falls for 2.1 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. In Cobb, during the entire year, the rain falls for 79.8 days and collects up to 17.44" (443mm) of precipitation.

Snowfall

In Cobb snow does not fall in April through October.

Daylight

The average length of the day in Cobb is 12.4h.

Sunshine

The average sunshine in Cobb is 11.1h.

UV index

In Cobb, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 Cobb?

The average high-temperature, in September, in Cobb, is 85.1°F (29.5°C), while the average low-temperature is 55.8°F (13.2°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that takes the relative humidity and factores it into the air temperature reading, in September is estimated at 85.5°F (29.7°C).

What is the average humidity in September in Cobb?

In Cobb, the average relative humidity in September is 45%.

How many days does it rain in September in Cobb?

In Cobb, California, in September, during 2.1 rainfall days, 0.08" (2mm) of precipitation is typically accumulated.

When it does not snow in Cobb?

April through October are months without snowfall in Cobb.

How many hours of daylight does Cobb have in September?

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

How many hours of sunshine does Cobb have in September?

The average sunshine in September in Cobb is 11.1h.

What is the UV index intensity in September in Cobb?

In Cobb, California, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.

Average temperature in September
Cobb, CA

Average temperature in September - Cobb, CA
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is December (52.7°F).

  • Average low temperature in September: 55.8°F

The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is December (38.1°F).

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Average pressure in September
Cobb, CA

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

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

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Average wind speed in September
Cobb, CA

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

The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).

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Average humidity in September
Cobb, CA

Average humidity in September - Cobb, CA
  • Average humidity in September: 45%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (44%).

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Average rainfall in September
Cobb, CA

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

The wettest month (with the highest rainfall) is February (3.7").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Cobb, CA

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

The month with the highest number of rainy days is March (13.9 days).
Months with the least rainy days are July and August (1.1 days).

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Average snowfall in September
Cobb, CA

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

The month with the highest snowfall is February (0.51").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Cobb, CA

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

The month with the highest number of snowfall days is February (0.9 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Cobb, 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: 9.5h).

  • Average sunshine in September: 11.1h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.3h).

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Average sunshine days in September
Cobb, CA

Average sunshine days in September - Cobb, CA
  • Average sunshine days in September: 27.1 days

The month with the most sunshine days is July (29.4 days).
The month with the least sunshine days is March (15.8 days).

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Average UV index in September
Cobb, CA

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

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are November and December (UV index 2).

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Average cloud cover in September
Cobb, CA

Average cloud cover in September - Cobb, CA
  • Average cloud cover in September: 9

The month with the most cloud cover is March (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in September
Cobb, CA

Average visibility in September - Cobb, 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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