September weather forecast and climate
Imperial Beach, CA

Weather in September

The first month of the autumn, September, is still a warm month in Imperial Beach, California, with average temperature fluctuating between 77°F (25°C) and 65.7°F (18.7°C).

Temperature

In Imperial Beach, the average high-temperature is practically the same as in August - a still moderately hot 77°F (25°C). In Imperial Beach, California, in September, the average low-temperature is 65.7°F (18.7°C).

Humidity

In Imperial Beach, California, the average relative humidity is 68%.

Rainfall

In Imperial Beach, it is raining for 4.4 days, with typically 0.31" (8mm) of accumulated precipitation. In Imperial Beach, during the entire year, the rain falls for 61.2 days and collects up to 7.32" (186mm) of precipitation.

Daylight

In Imperial Beach, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine in Imperial Beach is 10.2h.

UV index

Months with the highest UV index in Imperial Beach are July through September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Imperial Beach?

In Imperial Beach, California, in September, the average high-temperature is 77°F (25°C), and the average low-temperature is 65.7°F (18.7°C).

What is the average humidity in September in Imperial Beach?

The average relative humidity in September is 68%.

How many days does it rain in September in Imperial Beach?

In Imperial Beach, California, in September, during 4.4 rainfall days, 0.31" (8mm) of precipitation is typically accumulated.

How many hours of daylight does Imperial Beach have in September?

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

How many hours of sunshine does Imperial Beach have in September?

The average sunshine in September in Imperial Beach is 10.2h.

What are the months with the highest UV index in Imperial Beach?

July through September, with an average maximum UV index of 6, are months with the highest UV index in Imperial Beach.

What is the UV index reading in September in Imperial Beach?

In September, the average daily maximum UV index in Imperial Beach, California, is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays.

Average temperature in September
Imperial Beach, CA

Average temperature in September - Imperial Beach, CA
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is August (77.2°F).
The month with the lowest average high temperature is December (63.5°F).

  • Average low temperature in September: 65.7°F

The month with the highest average low temperature is August (66.6°F).
The coldest month (with the lowest average low temperature) is February (52°F).

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Average pressure in September
Imperial Beach, CA

Average pressure in September - Imperial Beach, CA
  • Average pressure in September: 29.88"

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are June and September (29.88").

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Average wind speed in September
Imperial Beach, CA

Average wind speed in September - Imperial Beach, CA
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is April (6.6mph).
The calmest month (with the lowest average wind speed) is October (5.3mph).

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Average humidity in September
Imperial Beach, CA

Average humidity in September - Imperial Beach, CA
  • Average humidity in September: 68%

The month with the highest relative humidity is June (73%).
Months with the lowest relative humidity are January and November (60%).

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Average rainfall in September
Imperial Beach, CA

Average rainfall in September - Imperial Beach, CA
  • Average rainfall in September: 0.31"

The wettest month (with the highest rainfall) is December (1.42").
The driest month (with the least rainfall) is June (0.12").

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Average rainfall days in September
Imperial Beach, CA

Average rainfall days in September - Imperial Beach, CA
  • Average rainfall days in September: 4.4 days

The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (2.5 days).

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Average daylight in September /
Average sunshine in September
Imperial Beach, CA

Average daylight in September / Average sunshine in September - Imperial Beach, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 10.2h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 6.6h).

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Average sunshine days in September
Imperial Beach, CA

Average sunshine days in September - Imperial Beach, CA
  • Average sunshine days in September: 23.9 days

The month with the most sunshine days is June (26 days).
The month with the least sunshine days is February (20.3 days).

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Average UV index in September
Imperial Beach, CA

Average UV index in September - Imperial Beach, CA
  • Average UV index in September: 6

Months with the highest UV index are July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 4).

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Average cloud cover in September
Imperial Beach, CA

Average cloud cover in September - Imperial Beach, CA
  • Average cloud cover in September: 13

Months with the most cloud cover are May and December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 10).

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Average visibility in September
Imperial Beach, CA

Average visibility in September - Imperial Beach, 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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