September weather forecast
Wilmington, CA

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Weather in September

September, the first month of the autumn in Wilmington, is also a moderately hot month, with an average temperature ranging between min 64.2°F (17.9°C) and max 75.9°F (24.4°C).

Temperature

Wilmington's highest average temperatures are recorded in August and September, reaching a high of 75.9°F (24.4°C).

Humidity

In Wilmington, the average relative humidity in September is 68%.

Rainfall

In Wilmington, California, in September, during 3.9 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. In Wilmington, during the entire year, the rain falls for 57.9 days and collects up to 6.65" (169mm) of precipitation.

Daylight

In September, the average length of the day in Wilmington is 12h and 22min.
On the first day of the month, sunrise is at 6:27 am and sunset at 7:18 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:38 pm PDT.

Sunshine

In Wilmington, the average sunshine in September is 10.5h.

UV index

July through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: An average maximum UV index of 6 in September leads to these recommendations:
Shield from overexposure. Defense against sun-related harm is required. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
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Frequently asked questions

What month is the hottest in Wilmington?

August and September, with an average high-temperature of 75.9°F (24.4°C), are warmest months in Wilmington, California.

What is the usual temperature for Wilmington in September?

The average high-temperature and low-temperature in Wilmington during September are 75.9°F (24.4°C) and 64.2°F (17.9°C) respectively.

What is the average humidity in September in Wilmington?

The average relative humidity in September in Wilmington is 68%.

How many days does it rain in September in Wilmington?

In Wilmington, in September, during 3.9 rainfall days, 0.24" (6mm) of precipitation is typically accumulated.

How many hours of daylight does Wilmington have in September?

In September, the average day length in Wilmington, California, is 12h and 22min.

When is the sunrise / sunset in September in Wilmington?

In September, on the first day of the month, sunrise is at 6:27 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:38 pm PDT.

How many hours of sunshine does Wilmington have in September?

In Wilmington, California, the average sunshine duration in September is 10.5h.

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

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

What is the UV index intensity in September in Wilmington?

The average daily maximum UV index in September in Wilmington is 6. A UV Index estimate of 6 to 7 represents a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Wilmington, CA

Average temperature in September - Wilmington, CA
  • Average high temperature in September: 75.9°F

The warmest months (with the highest average high temperature) are August and September (75.9°F).
The month with the lowest average high temperature is December (62.4°F).

  • Average low temperature in September: 64.2°F

The month with the highest average low temperature is September (64.2°F).
The coldest month (with the lowest average low temperature) is February (52.7°F).

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Average pressure in September
Wilmington, CA

Average pressure in September - Wilmington, CA
  • Average pressure in September: 29.9"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.9"Hg).

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Average wind speed in September
Wilmington, CA

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

The windiest month (with the highest average wind speed) is April (7mph).
The calmest month (with the lowest average wind speed) is September (5.3mph).

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Average humidity in September
Wilmington, CA

Average humidity in September - Wilmington, CA
  • Average humidity in September: 68%

The month with the highest relative humidity is June (75%).
The month with the lowest relative humidity is November (58%).

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Average rainfall in September
Wilmington, CA

Average rainfall in September - Wilmington, CA
  • Average rainfall in September: 0.24"

The wettest month (with the highest rainfall) is January (1.3").
The driest month (with the least rainfall) is June (0.12").

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Average rainfall days in September
Wilmington, CA

Average rainfall days in September - Wilmington, CA
  • Average rainfall days in September: 3.9 days

The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is August (3 days).

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

Average daylight in September / Average sunshine in September - Wilmington, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 10h and 3min

The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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Average sunshine days in September
Wilmington, CA

Average sunshine days in September - Wilmington, CA
  • Average sunshine days in September: 21.4 days

The month with the most sunshine days is January (24.2 days).
The month with the least sunshine days is June (17.7 days).

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Average UV index in September
Wilmington, CA

Average UV index in September - Wilmington, 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
Wilmington, CA

Average cloud cover in September - Wilmington, CA
  • Average cloud cover in September: 12

The month with the most cloud cover is December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 9).

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Average visibility in September
Wilmington, CA

Average visibility in September - Wilmington, 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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Wilmington, California, USA

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