September weather forecastOnyx, CA
September
Weather in September
The first month of the autumn, September, is still a warm month in Onyx, California, with an average temperature ranging between min 52.7°F (11.5°C) and max 78.6°F (25.9°C).Temperature
September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from 84.7°F (29.3°C) in August to a still warm 78.6°F (25.9°C). Despite the hot September days, Onyx's nights see an average temperature plunge to a fresh 52.7°F (11.5°C).Humidity
In Onyx, the average relative humidity in September is 34%.Rainfall
In Onyx, during September, the rain falls for 2.5 days and regularly aggregates up to 0.12" (3mm) of precipitation. In Onyx, during the entire year, the rain falls for 61 days and collects up to 11.81" (300mm) of precipitation.Snowfall
In Onyx, California, snow does not fall in May through October.Daylight
In September, the average length of the day in Onyx is 12h and 23min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:19 pm. On the last day of September, in Onyx, sunrise is at 6:47 am and sunset at 6:37 pm PDT.
Sunshine
In Onyx, California, the average sunshine in September is 11h.UV index
In September, the average daily maximum UV index in Onyx is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: An average UV index of 5 in September transforms into this advice:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Onyx, CA
- Average high temperature in September: 78.6°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (48.7°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is December (30.9°F).
Average pressure in September
Onyx, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Onyx, CA
- Average wind speed in September: 5.4mph
The windiest months (with the highest average wind speed) are May and June (7.3mph).
The calmest months (with the lowest average wind speed) are January and September (5.4mph).
Average humidity in September
Onyx, CA
- Average humidity in September: 34%
The month with the highest relative humidity is February (59%).
The month with the lowest relative humidity is August (31%).
Average rainfall in September
Onyx, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is January (2.48").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Onyx, CA
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is March (10.3 days).
The month with the least rainy days is June (1.3 days).
Average snowfall in September
Onyx, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.15").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Onyx, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Onyx, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 11h and 0min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 42min).
Average sunshine days in September
Onyx, CA
- Average sunshine days in September: 26.6 days
The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (19 days).
Average UV index in September
Onyx, CA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February, November and December (UV index 2).
Average cloud cover in September
Onyx, CA
- Average cloud cover in September: 5
The month with the most cloud cover is March (Cloud cover 26).
The months with the least cloud cover are August and September (Cloud cover 5).
Average visibility in September
Onyx, 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).
