September weather forecast
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

September, the first month of the autumn in Berkeley, is also a moderately hot month, with an average temperature ranging between min 56.8°F (13.8°C) and max 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

In September, the average relative humidity is 65%.

Rainfall

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

Daylight

The average length of the day in September in Berkeley is 12h and 25min.
On the first day of the month, sunrise is at 6:39 am and sunset at 7:38 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:54 pm PDT.

Sunshine

In September, the average sunshine 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 reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against 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. 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 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.

What is the temperature in September in Berkeley?

In Berkeley, California, 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 is 65%.

What is the driest month in Berkeley?

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

How much does it rain in Berkeley in September?

In Berkeley, California, in September, during 2.3 rainfall days, 0.08" (2mm) of precipitation is typically accumulated.

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

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

When is the sunrise / sunset in September in Berkeley?

On the first day of September in Berkeley, sunrise is at 6:39 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:54 pm PDT.

How long on average sun shines in September in Berkeley?

In September, the average sunshine duration in Berkeley, California, is 11h.

What is the month with the highest UV index in Berkeley?

April through September, with an average maximum UV index of 5, are months with the highest UV index in Berkeley, California.

What is the UV index intensity in September in Berkeley?

In September, the average daily maximum UV index in Berkeley, California, is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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: 12h and 25min

The month with the longest days is June (Average daylight: 14h and 45min).
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: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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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

The months with the highest UV index are April, May, June, July, August and September (UV index 5).
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
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

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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