September weather forecastRound Mountain, CA
September
Weather in September
September, the first month of the autumn in Round Mountain, is still a warm month, with an average temperature ranging between max 78.8°F (26°C) and min 48°F (8.9°C).Temperature
September sees a slight reduction in average high-temperature, with a shift from a warm 85.8°F (29.9°C) in August to a still moderately hot 78.8°F (26°C). Round Mountain, in September, experiences a marked contrast from daytime zeniths to a steady average low-temperature of 48°F (8.9°C).Humidity
In September, the average relative humidity is 45%.Rainfall
In Round Mountain, in September, during 4.1 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. In Round Mountain, during the entire year, the rain falls for 105 days and collects up to 24.69" (627mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 27min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:50 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 ordinary individuals.Note: The daily high UV index of 4 during September translates into the following recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Round Mountain, 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
Round Mountain, 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
Round Mountain, 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
Round Mountain, 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
Round Mountain, 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
Round Mountain, 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
Round Mountain, 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
Round Mountain, 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
Round Mountain, CA
- Average daylight in September: 12h and 24min
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 18min).
- 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
Round Mountain, 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
Round Mountain, 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
Round Mountain, 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
Round Mountain, 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).
