September weather forecast and climate
Concord, CA

Weather in September

September, the first month of the autumn, in Concord, is also a moderately hot month, with average temperature ranging between min 57.4°F (14.1°C) and max 81.9°F (27.7°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still warm 81.9°F (27.7°C). The average low-temperature, is 57.4°F (14.1°C).

Heat index

In September, the average heat index is estimated at 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', 'felt air temperature', 'apparent temperature', or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, clothing, wind), and activity. 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 especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

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

Rainfall

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

Daylight

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

Sunshine

The average sunshine in Concord is 11h.

UV index

In Concord, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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', 'real feel'), that combines air temperature and relative humidity, in September is appraised at 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.

What is the average humidity in September in Concord?

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

How many days does it rain in September in Concord?

In Concord, in September, it is raining for 1.8 days, with typically 0.04" (1mm) of accumulated precipitation.

What is the driest month in Concord?

June through September are months with the least rain in Concord when the rain falls for 1.8 days and typically aggregates up to 0.04" (1mm) of rain.

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

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

How long on average sun shines in September in Concord?

The average sunshine in September in Concord, California, is 11h.

What is the UV index intensity in September in Concord?

In September, the average daily maximum UV index in Concord, California, is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

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"

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
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%

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: 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: 11h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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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

Months with the highest UV index are June 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
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

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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