Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The onset of September aligns with a soft reduction in the average high-temperature, gently falling from a hot 86.9°F (30.5°C) in August to a warm 81.1°F (27.3°C). A noticeable temperature swing characterizes Foresthill's September nights, dipping to an average of 53.1°F (11.7°C).Heat index
September's average heat index is computed to be 80.6°F (27°C). If one sustains activity during exposure, it could lead to a sense of fatigue, with a chance of heat cramps.It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is an aggregate value of air's warmth and moisture to show the human-felt temperature. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
Humidity
In Foresthill, the average relative humidity in September is 41%.Rainfall
In Foresthill, in September, it is raining for 3.5 days, with typically 0.35" (9mm) of accumulated precipitation. In Foresthill, California, during the entire year, the rain falls for 85.5 days and collects up to 35.94" (913mm) of precipitation.Snowfall
June through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:32 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:46 pm PDT.
Sunshine
The average sunshine in September is 11.2h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a regular UV index of 4 translates into these guidelines:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Foresthill in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Foresthill have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Foresthill, CA
- Average high temperature in September: 81.1°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is December (49.1°F).
- Average low temperature in September: 53.1°F
The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).
Average pressure in September
Foresthill, CA
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Foresthill, CA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is February (6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Foresthill, CA
- Average humidity in September: 41%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is July (38%).
Average rainfall in September
Foresthill, CA
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is March (7.01").
The driest month (with the least rainfall) is July (0.04").
Average rainfall days in September
Foresthill, CA
- Average rainfall days in September: 3.5 days
The month with the highest number of rainy days is March (13.9 days).
The month with the least rainy days is July (1.4 days).
Average snowfall in September
Foresthill, CA
- Average snowfall in September: 0"
The month with the highest snowfall is March (17.87").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Foresthill, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (5.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Foresthill, CA
- Average daylight in September: 12h and 2min
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 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in September
Foresthill, CA
- Average sunshine days in September: 26.1 days
The month with the most sunshine days is July (28.4 days).
The month with the least sunshine days is March (13.5 days).
Average UV index in September
Foresthill, CA
- Average UV index in September: 4
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
Foresthill, CA
- Average cloud cover in September: 9
The month with the most cloud cover is March (Cloud cover 43).
The months with the least cloud cover are July and August (Cloud cover 5).
Average visibility in September
Foresthill, 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).
Foresthill, California, USA
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