September weather forecastSignal Hill, CA
September
Weather in September
The first month of the autumn, September, is still a warm month in Signal Hill, California, with an average temperature fluctuating between 64.8°F (18.2°C) and 78.8°F (26°C).Temperature
In Signal Hill, September's average high-temperature stands at a still warm 78.8°F (26°C), closely related to the preceding month. An average low-temperature of 64.8°F (18.2°C) is anticipated throughout the nights during September.Humidity
In Signal Hill, the average relative humidity in September is 63%.Rainfall
In September, the rain falls for 3.3 days. Throughout September, 0.24" (6mm) of precipitation is accumulated. In Signal Hill, during the entire year, the rain falls for 47.2 days and collects up to 5.59" (142mm) of precipitation.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September, sunrise is at 6:27 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
The average sunshine in September in Signal Hill is 10.6h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A daily maximum UV index of 6 in September translates into the following instructions:
Deflect overexposure. Sun protection is a necessity. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Signal Hill, CA
- Average high temperature in September: 78.8°F
The warmest month (with the highest average high temperature) is August (79.5°F).
The month with the lowest average high temperature is December (63.5°F).
- Average low temperature in September: 64.8°F
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (52°F).
Average pressure in September
Signal Hill, 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
Signal Hill, CA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest months (with the lowest average wind speed) are September and October (5mph).
Average humidity in September
Signal Hill, CA
- Average humidity in September: 63%
The month with the highest relative humidity is June (71%).
The month with the lowest relative humidity is November (55%).
Average rainfall in September
Signal Hill, CA
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is December (1.14").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Signal Hill, CA
- Average rainfall days in September: 3.3 days
The month with the highest number of rainy days is March (6 days).
The month with the least rainy days is June (1.8 days).
Average daylight in September /
Average sunshine in September
Signal Hill, 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 months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).
Average sunshine days in September
Signal Hill, CA
- Average sunshine days in September: 22.7 days
The month with the most sunshine days is January (25.7 days).
The month with the least sunshine days is June (20.8 days).
Average UV index in September
Signal Hill, 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
Signal Hill, CA
- Average cloud cover in September: 9
The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in September
Signal Hill, 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).
