September weather forecast
Concord, CA

Weather in September

September, the first month of the autumn in Concord, is still a warm month, with temperature in the range of an average low of 57.4°F (14.1°C) and an average high of 81.9°F (27.7°C).

Temperature

In Concord, the average high-temperature in September is relatively the same as in August - a still moderately hot 81.9°F (27.7°C). In September, the average low-temperature is 57.4°F (14.1°C).

Heat index

The average heat index in September is computed to be 83.5°F (28.6°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity 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 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, pregnancy, differences in body mass, height, and shape, and metabolic differences affect individual temperature impact. 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

September is the least humid month, with an average relative humidity of 56%.

Rainfall

The months with the least rainfall in Concord are June through September Rain falls for 1.8 days and accumulates 0.04" (1mm) of rain.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:52 pm PDT.

Sunshine

In September, the average sunshine is 11h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Concord?

The average high-temperature, in September, is 81.9°F (27.7°C), while the average low-temperature is 57.4°F (14.1°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in September is computed to be 83.5°F (28.6°C).

What is the least humid month in Concord?

With an average relative humidity of 56%, September is the least humid month in Concord, California.

What is the average humidity in September in Concord?

In Concord, the average relative humidity in September is 56%.

What is the driest month in Concord?

The months with the least rainfall are June through September Rain falls for 1.8 days and accumulates 0.04" (1mm) of rain.

How many days does it rain in September in Concord?

In Concord, California, in September, during 1.8 rainfall days, 0.04" (1mm) of precipitation is typically accumulated.

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

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

When are sunrise and sunset in September in Concord?

In September, on the first day of the month, sunrise is at 6:38 am and sunset at 7:37 pm. On the last day of the month, in Concord, California, sunrise is at 7:03 am and sunset at 6:52 pm PDT.

How long on average sun shines in September in Concord?

The average sunshine duration in September is 11h.

What is the UV index intensity in September in Concord?

In Concord, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Concord, CA

Average temperature in September - Concord, CA
  • Average high temperature in September: 81.9°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in September: 57.4°F

The month with the highest average low temperature is September (57.4°F).
The coldest month (with the lowest average low temperature) is January (42.3°F).

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Average pressure in September
Concord, CA

Average pressure in September - Concord, 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).

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Average wind speed in September
Concord, CA

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

The windiest month (with the highest average wind speed) is May (7.6mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).

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Average humidity in September
Concord, CA

Average humidity in September - Concord, CA
  • Average humidity in September: 56%

The months with the highest relative humidity are January and March (73%).
The month with the lowest relative humidity is September (56%).

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Average rainfall in September
Concord, CA

Average rainfall in September - Concord, CA
  • Average rainfall in September: 0.04"

The wettest month (with the highest rainfall) is February (0.87").
The driest months (with the least rainfall) are June, July, August and September (0.04").

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Average rainfall days in September
Concord, CA

Average rainfall days in September - Concord, CA
  • Average rainfall days in September: 1.8 days

The month with the highest number of rainy days is March (9.8 days).
The month with the least rainy days is August (0.5 days).

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

Average daylight in September / Average sunshine in September - Concord, CA
  • Average daylight in September: 12h and 25min

The month with the longest days is June (Average daylight: 14h and 46min).
The month with the shortest days is December (Average daylight: 9h and 35min).

  • Average sunshine in September: 11h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

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Average sunshine days in September
Concord, CA

Average sunshine days in September - Concord, CA
  • Average sunshine days in September: 27.8 days

The month with the most sunshine days is July (29.5 days).
The month with the least sunshine days is March (20 days).

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Average UV index in September
Concord, CA

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

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

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Average cloud cover in September
Concord, CA

Average cloud cover in September - Concord, CA
  • Average cloud cover in September: 11

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 8).

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Average visibility in September
Concord, CA

Average visibility in September - Concord, 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).

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