September weather forecastRoss, CA
September
Weather in September
September, the first month of the autumn in Ross, is also an agreeable month, with an average temperature fluctuating between 56.1°F (13.4°C) and 72.3°F (22.4°C).Temperature
September is Ross's warmest month, registering average high temperatures of 72.3°F (22.4°C) and lows of 56.1°F (13.4°C).Humidity
The average relative humidity in September is 71%.Rainfall
June through September are months with the least rain in Ross when the rain falls for 1.7 days and typically aggregates up to 0.04" (1mm) of rain.Daylight
In Ross, the average length of the day in September is 12h and 25min.On the first day of September in Ross, sunrise is at 6:40 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:54 pm PDT.
Sunshine
The average sunshine in September in Ross is 10.4h.UV index
The months with the highest UV index in Ross are April, June through September, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 5 in September translates into this advice:
Take precautions - Protection against skin and eye damage is obliged. To avoid the Sun's strongest rays, limit exposure around the mid-day period. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Ross, CA
- Average high temperature in September: 72.3°F
The warmest month (with the highest average high temperature) is September (72.3°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in September: 56.1°F
The month with the highest average low temperature is September (56.1°F).
The coldest month (with the lowest average low temperature) is December (45.3°F).
Average pressure in September
Ross, 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
Ross, CA
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is May (7.8mph).
The calmest months (with the lowest average wind speed) are October and November (5.5mph).
Average humidity in September
Ross, CA
- Average humidity in September: 71%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is October (68%).
Average rainfall in September
Ross, CA
- Average rainfall in September: 0.04"
The wettest month (with the highest rainfall) is February (0.87").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in September
Ross, CA
- Average rainfall days in September: 1.7 days
The month with the highest number of rainy days is March (8.8 days).
The months with the least rainy days are June and August (1.2 days).
Average daylight in September /
Average sunshine in September
Ross, 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 24min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Ross, CA
- Average sunshine days in September: 26 days
The month with the most sunshine days is June (26.4 days).
The month with the least sunshine days is March (20.7 days).
Average UV index in September
Ross, CA
- Average UV index in September: 5
The months with the highest UV index are April, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Ross, CA
- Average cloud cover in September: 19
The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 19).
Average visibility in September
Ross, 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).
