September weather forecastGreenwood, CA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Greenwood, California, with an average temperature fluctuating between 58.1°F (14.5°C) and 85.8°F (29.9°C).Temperature
As September takes its course, Greenwood's average high-temperature registers at a warm 85.8°F (29.9°C), closely aligning with the preceding month. In September, Greenwood experiences a significant drop from daily zeniths to an average nighttime temperature of 58.1°F (14.5°C).Heat index
September's average heat index is estimated at a tropical 86°F (30°C). Uninterrupted activity during exposure could lead to a sense of exhaustion, possibly causing heat cramps.Heat index evaluations are typically in the context of light winds and shaded environments. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
Humidity
In September, the average relative humidity is 40%.Rainfall
In Greenwood, California, in September, it is raining for 2.4 days, with typically 0.24" (6mm) of accumulated precipitation. Throughout the year, in Greenwood, California, there are 84.8 rainfall days, and 28.86" (733mm) of precipitation is accumulated.Snowfall
January, April through November are months without snowfall.Daylight
In Greenwood, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:33 pm. On the last day of September, in Greenwood, sunrise is at 6:59 am and sunset at 6:47 pm PDT.
Sunshine
In Greenwood, the average sunshine in September is 11.2h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 5 during September leads to these advisories:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Greenwood, CA
- Average high temperature in September: 85.8°F
The warmest month (with the highest average high temperature) is July (91.9°F).
The month with the lowest average high temperature is December (53.4°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is December (39.2°F).
Average pressure in September
Greenwood, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Greenwood, CA
- Average wind speed in September: 4.6mph
The windiest months (with the highest average wind speed) are February and March (5.7mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in September
Greenwood, CA
- Average humidity in September: 40%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (38%).
Average rainfall in September
Greenwood, CA
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is March (5.63").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Greenwood, CA
- Average rainfall days in September: 2.4 days
The month with the highest number of rainy days is March (15.4 days).
The month with the least rainy days is July (1 days).
Average snowfall in September
Greenwood, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.18").
The months with the least snowfall are January, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Greenwood, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.6 days).
The months with the least snowfall days are January, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Greenwood, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 11h and 12min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January and December (Average sunshine: 5h and 48min).
Average sunshine days in September
Greenwood, CA
- Average sunshine days in September: 27.3 days
The month with the most sunshine days is July (29.6 days).
The month with the least sunshine days is March (14.6 days).
Average UV index in September
Greenwood, CA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Greenwood, CA
- Average cloud cover in September: 8
The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Greenwood, 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).
