September weather forecastYermo, CA
September
Weather in September
September, the first month of the autumn in Yermo, is still a tropical month, with an average temperature fluctuating between 69.1°F (20.6°C) and 89.8°F (32.1°C).Temperature
September's arrival signals a moderate reduction in the average high-temperature, easing from a sweltering 97.3°F (36.3°C) in August to a hot 89.8°F (32.1°C). The average temperature during September nights dips to an agreeable 69.1°F (20.6°C).Humidity
The average relative humidity in September is 25%.Rainfall
In September, the rain falls for 2.8 days. Throughout September, 0.16" (4mm) of precipitation is accumulated. Throughout the year, there are 39 rainfall days, and 3.27" (83mm) of precipitation is accumulated.Snowfall
In Yermo, snow does not fall in February through December.Daylight
The average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:20 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:32 pm PDT.
Sunshine
In September, the average sunshine is 10.6h.UV index
The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: An average UV index of 6 in September transforms into this advice:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Yermo, CA
- Average high temperature in September: 89.8°F
The warmest month (with the highest average high temperature) is July (98.2°F).
The month with the lowest average high temperature is December (55°F).
- Average low temperature in September: 69.1°F
The month with the highest average low temperature is August (74.7°F).
The coldest month (with the lowest average low temperature) is December (40.1°F).
Average pressure in September
Yermo, CA
- Average pressure in September: 29.85"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.79"Hg).
Average wind speed in September
Yermo, CA
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is May (11.7mph).
The calmest month (with the lowest average wind speed) is January (6mph).
Average humidity in September
Yermo, CA
- Average humidity in September: 25%
The month with the highest relative humidity is December (47%).
The month with the lowest relative humidity is August (21%).
Average rainfall in September
Yermo, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is December (0.51").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Yermo, CA
- Average rainfall days in September: 2.8 days
The month with the highest number of rainy days is December (4.6 days).
The month with the least rainy days is June (0.6 days).
Average snowfall in September
Yermo, CA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.04").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Yermo, CA
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and December (0.3 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Yermo, 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 54min).
- Average sunshine in September: 10h and 36min
The months with the most sunshine are June, July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 7h and 6min).
Average sunshine days in September
Yermo, CA
- Average sunshine days in September: 26 days
The month with the most sunshine days is June (29 days).
The month with the least sunshine days is February (23.5 days).
Average UV index in September
Yermo, CA
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 8).
The months with the lowest UV index are November and December (UV index 3).
Average cloud cover in September
Yermo, CA
- Average cloud cover in September: 5
The month with the most cloud cover is December (Cloud cover 18).
The month with the least cloud cover is June (Cloud cover 4).
Average visibility in September
Yermo, 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).
