Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
As Santa Monica steps into September, the average high-temperature is measured at a still moderately hot 80.2°F (26.8°C), displaying minor differences from August's 80.8°F (27.1°C). In the month of September, the average temperature in Santa Monica dips to a refreshing 63.7°F (17.6°C) during the night.Humidity
The average relative humidity in September in Santa Monica is 61%.Rainfall
In Santa Monica, in September, it is raining for 2.5 days, with typically 0.16" (4mm) of accumulated precipitation. Throughout the year, there are 48.8 rainfall days, and 7.52" (191mm) of precipitation is accumulated.Ocean temperature
August through October, with an average ocean temperature of 66.2°F (19°C), are months with the warmest seawater in Santa Monica.Note: Swimming in 66.2°F (19°C) does not offer a pleasant experience for most individuals. The act of controlling one's breathing becomes progressively difficult as the water temperature goes under 69.8°F (21°C).
Daylight
In September, the average length of the day is 12h and 22min.On the first day of September, sunrise is at 6:28 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:39 pm PDT.
Sunshine
In Santa Monica, the average sunshine in September is 10.5h.UV index
The months with the highest UV index in Santa Monica, California, are June through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 6 during September, leads to the following recommendations:
Guard against overexposure. Protection from sun-induced harm is essential. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Experience reduced UV exposure by about half when donning a wide-brim hat.
Frequently asked questions
What is the usual temperature for Santa Monica in September?
What is the average humidity in September in Santa Monica?
How much does it rain in Santa Monica in September?
When is the ocean warmest in Santa Monica?
What is the ocean temperature in September in Santa Monica?
What is the average length of the day in September in Santa Monica?
When are sunrise and sunset in September in Santa Monica?
How long on average sun shines in September in Santa Monica?
When is the highest UV index in Santa Monica?
What is the UV index intensity in September in Santa Monica?
Average temperature in September
Santa Monica, CA
- Average high temperature in September: 80.2°F
The warmest month (with the highest average high temperature) is August (80.8°F).
The month with the lowest average high temperature is December (63.9°F).
- Average low temperature in September: 63.7°F
The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is February (50.5°F).
Average pressure in September
Santa Monica, 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).
Average wind speed in September
Santa Monica, CA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.3mph).
The calmest months (with the lowest average wind speed) are August and September (4.8mph).
Average humidity in September
Santa Monica, CA
- Average humidity in September: 61%
The month with the highest relative humidity is June (69%).
The month with the lowest relative humidity is November (52%).
Average rainfall in September
Santa Monica, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is January (1.54").
The driest months (with the least rainfall) are June and August (0.08").
Average rainfall days in September
Santa Monica, CA
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is August (1.8 days).
Average sea temperature in September
Santa Monica, CA
- Average sea temperature in September: 66°F
The best months for swimming (with the highest average sea temperature) are August, September and October (66°F).
The coldest months (with the lowest average sea temperature) are January, February, March, April, May and December (59°F).
Average daylight in September /
Average sunshine in September
Santa Monica, 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: 9h and 54min).
- Average sunshine in September: 10h and 3min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The months with the least sunshine are February and December (Average sunshine: 6h and 36min).
Average sunshine days in September
Santa Monica, CA
- Average sunshine days in September: 26.3 days
The month with the most sunshine days is August (27.9 days).
The month with the least sunshine days is February (21.8 days).
Average UV index in September
Santa Monica, CA
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in September
Santa Monica, CA
- Average cloud cover in September: 12
The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in September
Santa Monica, 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).
Santa Monica, California, USA
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