September weather forecast and climate
Durham, CA

Weather in September

The first month of the autumn, September, is still a tropical month in Durham, California, with average temperature varying between 87.4°F (30.8°C) and 59.9°F (15.5°C).

Temperature

In September, the average high-temperature slightly decreases, from 93.4°F (34.1°C) in August, to a still hot 87.4°F (30.8°C). In September, the average low-temperature is 59.9°F (15.5°C).

Humidity

The average relative humidity in Durham, California, is 35%.

Rainfall

In Durham, California, it is raining for 3.2 days, with typically 0.35" (9mm) of accumulated precipitation. Throughout the year, in Durham, there are 90.7 rainfall days, and 21.81" (554mm) of precipitation is accumulated.

Snowfall

January through November are months without snowfall in Durham.

Daylight

In Durham, the average length of the day is 12.4h.

Sunshine

In Durham, the average sunshine is 11.1h.

UV index

In September, the average daily maximum UV index in Durham 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 average individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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 Durham?

In Durham, California, in September, the average high-temperature is 87.4°F (30.8°C), and the average low-temperature is 59.9°F (15.5°C).

What is the average humidity in September in Durham?

In Durham, California, the average relative humidity in September is 35%.

How many days does it rain in September in Durham?

In September, in Durham, the rain falls for 3.2 days. Throughout September, 0.35" (9mm) of precipitation is accumulated.

When it does not snow in Durham?

In Durham snow does not fall in January through November.

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

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

How many hours of sunshine does Durham have in September?

In September, the average sunshine in Durham, California, is 11.1h.

What is the UV index reading in September in Durham?

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

Average temperature in September
Durham, CA

Average temperature in September - Durham, CA
  • Average high temperature in September: 87.4°F

The warmest month (with the highest average high temperature) is July (95.2°F).
The month with the lowest average high temperature is December (53.2°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is December (39°F).

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Average pressure in September
Durham, CA

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

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in September
Durham, CA

Average wind speed in September - Durham, CA
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is March (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity in September
Durham, CA

Average humidity in September - Durham, CA
  • Average humidity in September: 35%

The month with the highest relative humidity is March (72%).
The month with the lowest relative humidity is July (32%).

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Average rainfall in September
Durham, CA

Average rainfall in September - Durham, CA
  • Average rainfall in September: 0.35"

The wettest month (with the highest rainfall) is February (3.94").
The driest month (with the least rainfall) is July (0.08").

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Average rainfall days in September
Durham, CA

Average rainfall days in September - Durham, CA
  • Average rainfall days in September: 3.2 days

The month with the highest number of rainy days is March (15.2 days).
The month with the least rainy days is August (1.9 days).

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Average snowfall in September
Durham, CA

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

The month with the highest snowfall is December (0.12").
Months with the least snowfall are January, February, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Durham, CA

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

The month with the highest number of snowfall days is December (0.4 days).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).

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

Average daylight in September / Average sunshine in September - Durham, 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: 9.4h).

  • Average sunshine in September: 11.1h

The month with the most sunshine is July (Average sunshine: 12.2h).
Months with the least sunshine are January and December (Average sunshine: 5.9).

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Average sunshine days in September
Durham, CA

Average sunshine days in September - Durham, CA
  • Average sunshine days in September: 25.5 days

The month with the most sunshine days is August (28.1 days).
The month with the least sunshine days is March (14.9 days).

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Average UV index in September
Durham, CA

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

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Durham, CA

Average cloud cover in September - Durham, CA
  • Average cloud cover in September: 8

The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in September
Durham, CA

Average visibility in September - Durham, 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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