September weather forecastSurfside, CA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Surfside, California, with an average temperature ranging between max 77°F (25°C) and min 64.6°F (18.1°C).Temperature
Surfside experiences a minor change to a still moderately hot 77°F (25°C) in average high-temperature during September, closely reflecting August. During the nights in September, the temperature averages to an enjoyable 64.6°F (18.1°C).Humidity
In Surfside, the average relative humidity in September is 67%.Rainfall
In Surfside, California, in September, it is raining for 3 days, with typically 0.2" (5mm) of accumulated precipitation. Throughout the year, in Surfside, California, there are 57.8 rainfall days, and 8.82" (224mm) of precipitation is accumulated.Daylight
In Surfside, the average length of the day in September is 12h and 22min.On the first day of September in Surfside, California, sunrise is at 6:26 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:37 pm PDT.
Sunshine
In Surfside, the average sunshine in September is 10.6h.UV index
The months with the highest UV index in Surfside are July through September, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum daily UV index of 6 during September morphs into the following directions:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Surfside, CA
- Average high temperature in September: 77°F
The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is December (62.8°F).
- Average low temperature in September: 64.6°F
The month with the highest average low temperature is August (65.3°F).
The coldest month (with the lowest average low temperature) is February (52.7°F).
Average pressure in September
Surfside, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.89"Hg).
Average wind speed in September
Surfside, CA
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is April (6.7mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.3mph).
Average humidity in September
Surfside, CA
- Average humidity in September: 67%
The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (57%).
Average rainfall in September
Surfside, CA
- Average rainfall in September: 0.2"
The wettest month (with the highest rainfall) is December (1.77").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Surfside, CA
- Average rainfall days in September: 3 days
The month with the highest number of rainy days is March (8.1 days).
The months with the least rainy days are June and August (2.3 days).
Average daylight in September /
Average sunshine in September
Surfside, CA
- Average daylight in September: 12h and 24min
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 36min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in September
Surfside, CA
- Average sunshine days in September: 25.5 days
The month with the most sunshine days is August (26.3 days).
The month with the least sunshine days is February (19.3 days).
Average UV index in September
Surfside, 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).
Average cloud cover in September
Surfside, CA
- Average cloud cover in September: 10
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 7).
Average visibility in September
Surfside, 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).
