September weather forecast and climate
Pittsburg, CA

Weather in September

September, the first month of the autumn, in Pittsburg, is still a warm month, with average temperature varying between 57.7°F (14.3°C) and 84.7°F (29.3°C).

Temperature

In September, the average high-temperature is almost the same as in August - a warm 84.7°F (29.3°C). The average low-temperature, in Pittsburg, is 57.7°F (14.3°C).

Heat index

The average heat index is calculated to a hot 86.9°F (30.5°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'real feel', or 'felt air temperature', 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 subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, metabolic differences, wind). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index 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 least humid month in Pittsburg is September, with an average relative humidity of 53%.

Rainfall

In Pittsburg, California, it is raining for 2.1 days, with typically 0.08" (2mm) of accumulated precipitation. Throughout the year, there are 66.9 rainfall days, and 10.39" (264mm) of precipitation is accumulated.

Daylight

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

Sunshine

The average sunshine in Pittsburg is 11.2h.

UV index

In September, the average daily maximum UV index in Pittsburg is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Pittsburg?

The average high-temperature, in September, in Pittsburg, California, is 84.7°F (29.3°C), while the average low-temperature is 57.7°F (14.3°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), that takes the relative humidity and factores it into the air temperature reading, in September is estimated at 86.9°F (30.5°C).

What is the least humid month in Pittsburg?

With an average relative humidity of 53%, September is the least humid month in Pittsburg, California.

What is the average humidity in September in Pittsburg?

The average relative humidity in September in Pittsburg is 53%.

How much does it rain in Pittsburg in September?

In Pittsburg, California, during September, the rain falls for 2.1 days and regularly aggregates up to 0.08" (2mm) of precipitation.

What is the average length of the day in September in Pittsburg?

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

How many hours of sunshine does Pittsburg have in September?

The average sunshine in September in Pittsburg, California, is 11.2h.

How high is the UV index in September in Pittsburg?

In Pittsburg, 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 the exposure to the Sun's UV radiation.

Average temperature in September
Pittsburg, CA

Average temperature in September - Pittsburg, CA
  • Average high temperature in September: 84.7°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 (55.2°F).

  • Average low temperature in September: 57.7°F

Months with the highest average low temperature are August and September (57.7°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).

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Average pressure in September
Pittsburg, CA

Average pressure in September - Pittsburg, 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
Pittsburg, CA

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

The windiest months (with the highest average wind speed) are May and June (7.6mph).
The calmest months (with the lowest average wind speed) are January and November (4.5mph).

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Average humidity in September
Pittsburg, CA

Average humidity in September - Pittsburg, CA
  • Average humidity in September: 53%

Months with the highest relative humidity are January and March (73%).
The month with the lowest relative humidity is September (53%).

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Average rainfall in September
Pittsburg, CA

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

The wettest month (with the highest rainfall) is February (2.01").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Pittsburg, CA

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

The month with the highest number of rainy days is March (12.7 days).
The month with the least rainy days is August (0.9 days).

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

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

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 11.2h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days in September
Pittsburg, CA

Average sunshine days in September - Pittsburg, CA
  • Average sunshine days in September: 27.5 days

The month with the most sunshine days is August (29.8 days).
The month with the least sunshine days is March (17.5 days).

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Average UV index in September
Pittsburg, CA

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

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Pittsburg, CA

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

The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 5).

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Average visibility in September
Pittsburg, CA

Average visibility in September - Pittsburg, 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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