September weather forecast
Imperial Beach, CA

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Weather in September

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

Temperature

As August turns into September, the average high-temperatures rest at a still moderately hot 77°F (25°C), showing a minor variation from the prior month. During the month of September, Imperial Beach experiences a steady low-temperature average of 65.7°F (18.7°C).

Humidity

In September, the average relative humidity is 68%.

Rainfall

In Imperial Beach, California, in September, it is raining for 4.4 days, with typically 0.31" (8mm) of accumulated precipitation. Throughout the year, in Imperial Beach, there are 61.2 rainfall days, and 7.32" (186mm) of precipitation is accumulated.

Daylight

In September, the average length of the day in Imperial Beach is 12h and 22min.
On the first day of the month, sunrise is at 6:23 am and sunset at 7:12 pm. On the last day of September, in Imperial Beach, sunrise is at 6:42 am and sunset at 6:33 pm PDT.

Sunshine

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

UV index

July through September, with an average maximum UV index of 6, are months with the highest UV index in Imperial Beach, California. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 6 during September leads to these advisories:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
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Frequently asked questions

What is the usual temperature for Imperial Beach in September?

The high-temperature, in September, in Imperial Beach, records 77°F (25°C), while the low-temperature is 65.7°F (18.7°C).

What is the average humidity in September in Imperial Beach?

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, during September, the rain falls for 4.4 days and regularly aggregates up to 0.31" (8mm) of precipitation.

What is the average length of the day in September in Imperial Beach?

In Imperial Beach, the average day length in September is 12h and 22min.

When is the sunrise / sunset in September in Imperial Beach?

On the first day of September in Imperial Beach, California, sunrise is at 6:23 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:42 am and sunset at 6:33 pm PDT.

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

The average sunshine duration 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, California.

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

The average daily maximum UV index in September in Imperial Beach, California, is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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%).
The 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: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 6min).

  • Average sunshine in September: 10h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

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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

The months with the highest UV index are July, August and September (UV index 6).
The 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

The 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

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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Imperial Beach, California, USA

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