September weather forecast
Pittsburg, CA

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Weather in September

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

Temperature

The transition into September marks the average high-temperature at a moderately hot 84.7°F (29.3°C), differing minimally from August's 86.5°F (30.3°C). Throughout September, Pittsburg acknowledges a distinct difference between its daytime highs and the steady low average of 57.7°F (14.3°C).

Heat index

September's heat index is evaluated at a hot 86°F (30°C). Enduring exposure and ongoing activity could cause a sense of fatigue and subsequent heat cramps.
Know that the heat index computations account for shaded terrains and slight winds. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', unifies temperature and humidity readings to offer a comprehensive feel of warmth. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.

Humidity

September is the least humid month, with an average relative humidity of 53%.

Rainfall

In Pittsburg, in September, during 2.1 rainfall days, 0.08" (2mm) of precipitation is typically accumulated. Throughout the year, there are 66.9 rainfall days, and 10.39" (264mm) of precipitation is accumulated.

Daylight

In Pittsburg, California, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:51 pm PDT.

Sunshine

The average sunshine in September is 11.2h.

UV index

In Pittsburg, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index of 5 during September translates into these guidelines:
Undertake protective steps - Preventing 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. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Updated: Jun 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in Pittsburg in September?

The high-temperature during September is 84.7°F (29.3°C) and the low-temperature is 57.7°F (14.3°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in September is evaluated at 86°F (30°C).

What is the least humid month?

The least humid month in Pittsburg is September, with an average relative humidity of 53%.

What is the average humidity in September?

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

How much does it rain in September?

In Pittsburg, in September, it is raining for 2.1 days, with typically 0.08" (2mm) of accumulated precipitation.

How many hours of daylight does Pittsburg have in September?

The average day length in September is 12h and 25min.

What time are sunrise and sunset in September in Pittsburg?

On the first day of September, sunrise is at 6:38 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm PDT.

How long on average sun shines in September?

In September, the average sunshine duration is 11.2h.

What is the UV index reading in September?

The average daily maximum UV index in September in Pittsburg, California, is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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

The 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).

Average pressure in September
Pittsburg, CA

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

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

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).

Average humidity in September
Pittsburg, CA

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

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

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").

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).

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

Average daylight in September / Average sunshine in September - Pittsburg, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in September: 11h and 1min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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).

Average UV index in September
Pittsburg, CA

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

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

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).

Average visibility in September
Pittsburg, CA

Average visibility in September - Pittsburg, 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).

Pittsburg, California, USA

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