September weather forecastMount Hermon, CA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Mount Hermon, California, with an average temperature ranging between min 55.4°F (13°C) and max 74.5°F (23.6°C).Temperature
The start of September sees the average high-temperature at a still warm 74.5°F (23.6°C), showing little difference from August's 74.8°F (23.8°C). In September, the temperature drops to an average of 55.4°F (13°C) at night.Humidity
In Mount Hermon, the average relative humidity in September is 69%.Rainfall
In Mount Hermon, in September, it is raining for 2.9 days, with typically 0.12" (3mm) of accumulated precipitation. In Mount Hermon, during the entire year, the rain falls for 72.5 days and collects up to 13.58" (345mm) of precipitation.Daylight
In September, the average length of the day is 12h and 24min.On the first day of September, sunrise is at 6:39 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:52 pm PDT.
Sunshine
In September, the average sunshine is 10.9h.UV index
The months with the highest UV index in Mount Hermon are June through October, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: A typical high UV index of 5 in September suggests the following recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mount Hermon, CA
- Average high temperature in September: 74.5°F
The warmest month (with the highest average high temperature) is August (74.8°F).
The month with the lowest average high temperature is December (57°F).
- Average low temperature in September: 55.4°F
The month with the highest average low temperature is September (55.4°F).
The coldest month (with the lowest average low temperature) is February (45.1°F).
Average pressure in September
Mount Hermon, 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
Mount Hermon, CA
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Mount Hermon, CA
- Average humidity in September: 69%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (67%).
Average rainfall in September
Mount Hermon, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is February (2.6").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Mount Hermon, CA
- Average rainfall days in September: 2.9 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (0.8 days).
Average daylight in September /
Average sunshine in September
Mount Hermon, CA
- Average daylight in September: 12h and 24min
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 42min).
- Average sunshine in September: 10h and 54min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Mount Hermon, CA
- Average sunshine days in September: 26 days
The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is March (17.5 days).
Average UV index in September
Mount Hermon, CA
- Average UV index in September: 5
The months with the highest UV index are June, July, August, September and October (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in September
Mount Hermon, CA
- Average cloud cover in September: 14
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 12).
Average visibility in September
Mount Hermon, 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).
