September weather forecastCherry Valley, CA
September
Weather in September
September, the first month of the autumn in Cherry Valley, is still a warm month, with an average temperature fluctuating between 84.4°F (29.1°C) and 61.2°F (16.2°C).Temperature
The commencement of September introduces an average high-temperature of a warm 84.4°F (29.1°C), closely mirroring the preceding month. September nights show a substantial disparity from the daytime peak with an average low-temperature of 61.2°F (16.2°C).Heat index
The heat index value for September is estimated at 84.2°F (29°C). Continuous exposure and activity could induce a sense of tiredness and subsequently, heat cramps.Know that the heat index computations account for shaded terrains and slight winds. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', joins air temperature with relative humidity to produce a temperature perception for humans. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
Humidity
In Cherry Valley, the average relative humidity in September is 40%.Rainfall
In September, the rain falls for 2.7 days. Throughout September, 0.16" (4mm) of precipitation is accumulated. In Cherry Valley, during the entire year, the rain falls for 47.7 days and collects up to 6.69" (170mm) of precipitation.Snowfall
In Cherry Valley, snow does not fall in January, April through October.Daylight
In Cherry Valley, the average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:13 pm. On the last day of September, sunrise is at 6:42 am and sunset at 6:33 pm PDT.
Sunshine
The average sunshine in September is 10.5h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. 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
Cherry Valley, CA
- Average high temperature in September: 84.4°F
The warmest month (with the highest average high temperature) is August (88.7°F).
The month with the lowest average high temperature is December (56.5°F).
- Average low temperature in September: 61.2°F
The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is December (40.1°F).
Average pressure in September
Cherry Valley, CA
- Average pressure in September: 29.86"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in September
Cherry Valley, CA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is April (6.8mph).
The calmest month (with the lowest average wind speed) is September (5.2mph).
Average humidity in September
Cherry Valley, CA
- Average humidity in September: 40%
The month with the highest relative humidity is February (54%).
The month with the lowest relative humidity is August (37%).
Average rainfall in September
Cherry Valley, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is February (1.38").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Cherry Valley, CA
- Average rainfall days in September: 2.7 days
The month with the highest number of rainy days is December (5.9 days).
The month with the least rainy days is June (1.2 days).
Average snowfall in September
Cherry Valley, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.83").
The months with the least snowfall are January, April, May, June, July, August, September and October (0").
Average snowfall days in September
Cherry Valley, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are January, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Cherry Valley, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 10h and 30min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in September
Cherry Valley, CA
- Average sunshine days in September: 25.1 days
The month with the most sunshine days is June (28.4 days).
The month with the least sunshine days is February (21.8 days).
Average UV index in September
Cherry Valley, CA
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in September
Cherry Valley, CA
- Average cloud cover in September: 7
The month with the most cloud cover is December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in September
Cherry Valley, 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).
