September weather forecast
Pacifica, CA

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Weather in September

The first month of the autumn, September, is still a refreshing month in Pacifica, California, with an average temperature varying between 67.5°F (19.7°C) and 56.8°F (13.8°C).

Temperature

September brings the highest temperatures, with an average high of 67.5°F (19.7°C) and an average low of 56.8°F (13.8°C).

Humidity

In September, the average relative humidity in Pacifica is 77%.

Rainfall

The months with the least rainfall are June, July and September Rain falls for 3.6 days and accumulates 0.12" (3mm) of rain.

Daylight

In Pacifica, the average length of the day in September is 12h and 25min.
On the first day of September, sunrise is at 6:40 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:53 pm PDT.

Sunshine

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

UV index

The months with the highest UV index are June, August and September, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In September, a regular UV index of 5 translates into these guidelines:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the warmest month?

Temperature records mark September as the warmest month, with highs averaging 67.5°F (19.7°C) and lows at 56.8°F (13.8°C).

What is the temperature in September?

The high-temperature during September is 67.5°F (19.7°C) and the low-temperature is 56.8°F (13.8°C).

What is the average humidity in September?

The average relative humidity in September is 77%.

What is the driest month?

The months with the least rainfall are June, July and September Rain falls for 3.6 days and accumulates 0.12" (3mm) of rain.

How many days does it rain in September?

In September, the rain falls for 3.6 days. Throughout September, 0.12" (3mm) of precipitation is accumulated.

How many hours of daylight does Pacifica have in September?

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

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:40 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:53 pm PDT.

How long on average sun shines in September?

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

What is the month with the highest UV index?

The months with the highest UV index are June, August and September, with an average maximum UV index of 5.

How high is the UV index in September?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health 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
Pacifica, CA

Average temperature in September - Pacifica, CA
  • Average high temperature in September: 67.5°F

The warmest month (with the highest average high temperature) is September (67.5°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in September: 56.8°F

The month with the highest average low temperature is September (56.8°F).
The coldest months (with the lowest average low temperature) are January and February (48.7°F).

Average pressure in September
Pacifica, CA

Average pressure in September - Pacifica, CA
  • Average pressure in September: 29.92"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).

Average wind speed in September
Pacifica, CA

Average wind speed in September - Pacifica, CA
  • Average wind speed in September: 6.8mph

The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest months (with the lowest average wind speed) are August and September (6.8mph).

Average humidity in September
Pacifica, CA

Average humidity in September - Pacifica, CA
  • Average humidity in September: 77%

The month with the highest relative humidity is August (82%).
The months with the lowest relative humidity are November and December (72%).

Average rainfall in September
Pacifica, CA

Average rainfall in September - Pacifica, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is February (1.34").
The driest months (with the least rainfall) are June, July and September (0.12").

Average rainfall days in September
Pacifica, CA

Average rainfall days in September - Pacifica, CA
  • Average rainfall days in September: 3.6 days

The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is September (3.6 days).

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

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

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in September: 10h and 3min

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

Average sunshine days in September
Pacifica, CA

Average sunshine days in September - Pacifica, CA
  • Average sunshine days in September: 22.6 days

The month with the most sunshine days is October (24.5 days).
The month with the least sunshine days is August (18.7 days).

Average UV index in September
Pacifica, CA

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

The months with the highest UV index are June, August and September (UV index 5).
The months with the lowest UV index are February and December (UV index 3).

Average cloud cover in September
Pacifica, CA

Average cloud cover in September - Pacifica, CA
  • Average cloud cover in September: 21

The month with the most cloud cover is March (Cloud cover 39).
The months with the least cloud cover are September and October (Cloud cover 21).

Average visibility in September
Pacifica, CA

Average visibility in September - Pacifica, 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).

Pacifica, California, USA

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