September weather forecastDemuth, CA
September
Weather in September
September, the first month of the autumn in Demuth, is still a warm month, with an average temperature fluctuating between 48°F (8.9°C) and 78.8°F (26°C).Temperature
With the arrival of September, Demuth experiences a modest decline in average high-temperatures, transitioning from a warm 85.8°F (29.9°C) in August to a still moderately hot 78.8°F (26°C). With a notable difference from peak temperatures, an average of 48°F (8.9°C) marks the nights in September.Humidity
In September, the average relative humidity is 45%.Rainfall
In Demuth, during September, the rain falls for 4.1 days and regularly aggregates up to 0.39" (10mm) of precipitation. Throughout the year, there are 105 rainfall days, and 24.69" (627mm) of precipitation is accumulated.Snowfall
In Demuth, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:47 pm PDT.
Sunshine
In September, the average sunshine is 11.1h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Ensure safety - Recommendations to avert sunburn are presented. To guard against the harmful effects of the Sun, minimize exposure during midday. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Demuth, CA
- Average high temperature in September: 78.8°F
The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is December (43.3°F).
- Average low temperature in September: 48°F
The month with the highest average low temperature is July (53.1°F).
The coldest month (with the lowest average low temperature) is December (27.9°F).
Average pressure in September
Demuth, CA
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).
Average wind speed in September
Demuth, CA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is March (5.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in September
Demuth, CA
- Average humidity in September: 45%
The months with the highest relative humidity are January and March (79%).
The months with the lowest relative humidity are July and August (40%).
Average rainfall in September
Demuth, CA
- Average rainfall in September: 0.39"
The wettest month (with the highest rainfall) is March (4.45").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in September
Demuth, CA
- Average rainfall days in September: 4.1 days
The month with the highest number of rainy days is April (14.5 days).
The month with the least rainy days is August (2.3 days).
Average snowfall in September
Demuth, CA
- Average snowfall in September: 0"
The month with the highest snowfall is March (10.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Demuth, CA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is March (8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Demuth, CA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 11h and 6min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Demuth, CA
- Average sunshine days in September: 24.7 days
The month with the most sunshine days is August (26 days).
The month with the least sunshine days is March (11.3 days).
Average UV index in September
Demuth, CA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Demuth, CA
- Average cloud cover in September: 10
The month with the most cloud cover is March (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 6).
Average visibility in September
Demuth, CA
- Average visibility in September: 6mi
The months with the highest visibility are February, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, March and December (5mi).
