September weather forecast and climate
Berkeley, CA

the neon-lit iconic Berkeley University Sather Tower in California
the neon-lit iconic Berkeley University Sather Tower in California

Weather in September

The first month of the autumn, September, is still a warm month in Berkeley, California, with average temperature varying between 56.8°F (13.8°C) and 76.6°F (24.8°C).

Temperature

With an average high-temperature of 76.6°F (24.8°C) and an average low-temperature of 56.8°F (13.8°C), September is the warmest month.

Humidity

The average relative humidity in September is 65%.

Rainfall

Months with the least rainfall are June through September Rain falls for 2.3 days and accumulates 0.08" (2mm) of rain.

Daylight

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

Sunshine

The average sunshine in Berkeley is 11h.

UV index

April through September, with an average maximum UV index of 5, are months with the highest UV index. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
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 warmest month in Berkeley?

With an average high-temperature of 76.6°F (24.8°C) and an average low-temperature of 56.8°F (13.8°C), September is the warmest month in Berkeley, California.

What is the temperature in September in Berkeley?

In September, the average high-temperature is 76.6°F (24.8°C), and the average low-temperature is 56.8°F (13.8°C).

What is the average humidity in September in Berkeley?

In September, the average relative humidity in Berkeley is 65%.

How much does it rain in Berkeley in September?

In Berkeley, during September, the rain falls for 2.3 days and regularly aggregates up to 0.08" (2mm) of precipitation.

What is the driest month in Berkeley?

Months with the least rainfall are June through September Rain falls for 2.3 days and accumulates 0.08" (2mm) of rain.

How many hours of daylight does Berkeley have in September?

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

How long on average sun shines in September in Berkeley?

In September, the average sunshine is 11h.

What are the months with the highest UV index in Berkeley?

Months with the highest UV index are April through September, with an average maximum UV index of 5.

How high is the UV index in September in Berkeley?

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Berkeley, CA

Average temperature in September - Berkeley, CA
  • Average high temperature in September: 76.6°F

The warmest month (with the highest average high temperature) is September (76.6°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in September: 56.8°F

The month with the highest average low temperature is September (56.8°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).

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Average pressure in September
Berkeley, CA

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

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed in September
Berkeley, CA

Average wind speed in September - Berkeley, CA
  • Average wind speed in September: 5.6mph

The windiest month (with the highest average wind speed) is May (7.3mph).
The calmest month (with the lowest average wind speed) is November (5mph).

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Average humidity in September
Berkeley, CA

Average humidity in September - Berkeley, CA
  • Average humidity in September: 65%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (64%).

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Average rainfall in September
Berkeley, CA

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

The wettest month (with the highest rainfall) is February (1.1").
The driest months (with the least rainfall) are June, July, August and September (0.08").

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Average rainfall days in September
Berkeley, CA

Average rainfall days in September - Berkeley, CA
  • Average rainfall days in September: 2.3 days

The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (1.5 days).

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

Average daylight in September / Average sunshine in September - Berkeley, 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: 11.9h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days in September
Berkeley, CA

Average sunshine days in September - Berkeley, CA
  • Average sunshine days in September: 24.9 days

The month with the most sunshine days is October (26 days).
The month with the least sunshine days is February (20.5 days).

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Average UV index in September
Berkeley, CA

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

Months with the highest UV index are April, May, June, July, August and September (UV index 5).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Berkeley, CA

Average cloud cover in September - Berkeley, CA
  • Average cloud cover in September: 13

The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 11).

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Average visibility in September
Berkeley, CA

Average visibility in September - Berkeley, 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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