September weather forecastNicasio, CA
September
Weather in September
September, the first month of the autumn in Nicasio, is also a moderately hot month, with temperature in the range of an average low of 55.8°F (13.2°C) and an average high of 75.4°F (24.1°C).Temperature
September, characterized by an average high temperature of 75.4°F (24.1°C) and a low temperature of 55.8°F (13.2°C), is generally the warmest month.Humidity
The average relative humidity in September in Nicasio is 67%.Rainfall
The months with the least rainfall are July through September Rain falls for 3 days and accumulates 0.08" (2mm) of rain.Daylight
In Nicasio, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:41 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:06 am and sunset at 6:54 pm PDT.
Sunshine
The average sunshine in September in Nicasio is 10.9h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Undertake protective steps - Recommendations to avoid sunburn are issued. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Nicasio, CA
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is September (75.4°F).
The month with the lowest average high temperature is December (55.2°F).
- Average low temperature in September: 55.8°F
The month with the highest average low temperature is September (55.8°F).
The coldest month (with the lowest average low temperature) is December (43.9°F).
Average pressure in September
Nicasio, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in September
Nicasio, CA
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is May (7.3mph).
The calmest month (with the lowest average wind speed) is November (5.1mph).
Average humidity in September
Nicasio, CA
- Average humidity in September: 67%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is October (66%).
Average rainfall in September
Nicasio, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is February (1.65").
The driest months (with the least rainfall) are July, August and September (0.08").
Average rainfall days in September
Nicasio, CA
- Average rainfall days in September: 3 days
The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is June (2 days).
Average daylight in September /
Average sunshine in September
Nicasio, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 10h and 54min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in September
Nicasio, CA
- Average sunshine days in September: 24 days
The month with the most sunshine days is October (24.9 days).
The month with the least sunshine days is March (18.5 days).
Average UV index in September
Nicasio, CA
- Average UV index in September: 5
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Nicasio, CA
- Average cloud cover in September: 14
The month with the most cloud cover is March (Cloud cover 38).
The months with the least cloud cover are July and September (Cloud cover 14).
Average visibility in September
Nicasio, 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).
