September weather forecast and climate
Foresthill, CA

Weather in September

September, the first month of the autumn, in Foresthill, is also a moderately hot month, with temperature in the range of an average low of 53.1°F (11.7°C) and an average high of 81.1°F (27.3°C).

Temperature

In Foresthill, the average high-temperature slightly decreases, from a tropical 86.9°F (30.5°C) in August, to a warm 81.1°F (27.3°C). In September, in Foresthill, the average low-temperature is 53.1°F (11.7°C).

Heat index

The average heat index in September is calculated to 80.8°F (27.1°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, differences in body mass, height, and shape, pregnancy), and activity. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in Foresthill is 41%.

Rainfall

In September, the rain falls for 3.5 days. Throughout September, 0.35" (9mm) of precipitation is accumulated. In Foresthill, during the entire year, the rain falls for 85.5 days and collects up to 35.94" (913mm) of precipitation.

Snowfall

In Foresthill snow does not fall in June through October.

Daylight

The average length of the day in Foresthill is 12.4h.

Sunshine

In September, the average sunshine in Foresthill is 11.2h.

UV index

In Foresthill, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Foresthill?

In September, in Foresthill, California, the average high-temperature is 81.1°F (27.3°C), and the average low-temperature is 53.1°F (11.7°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that combines relative humidity and air temperature, in September is calculated to 80.8°F (27.1°C).

What is the average humidity in September in Foresthill?

The average relative humidity in September is 41%.

How many days does it rain in September in Foresthill?

In September, in Foresthill, California, the rain falls for 3.5 days. Throughout September, 0.35" (9mm) of precipitation is accumulated.

When it does not snow in Foresthill?

June through October are months without snowfall in Foresthill.

How many hours of daylight does Foresthill have in September?

The average length of the day in September in Foresthill, California, is 12.4h.

How many hours of sunshine does Foresthill have in September?

In Foresthill, the average sunshine in September is 11.2h.

What is the UV index intensity in September in Foresthill?

In Foresthill, California, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Foresthill, CA

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).

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Average pressure in September
Foresthill, CA

Average pressure in September - Foresthill, CA
  • Average pressure in September: 29.93"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in September
Foresthill, CA

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).

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Average humidity in September
Foresthill, CA

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%).

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Average rainfall in September
Foresthill, CA

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").

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Average rainfall days in September
Foresthill, CA

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).

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Average snowfall in September
Foresthill, CA

Average snowfall in September - Foresthill, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (17.87").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Foresthill, CA

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).
Months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Foresthill, CA

Average daylight in September / Average sunshine in September - Foresthill, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 11.2h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is January (Average sunshine: 5.7h).

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Average sunshine days in September
Foresthill, CA

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).

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Average UV index in September
Foresthill, CA

Average UV index in September - Foresthill, CA
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are February, November and December (UV index 2).

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Average cloud cover in September
Foresthill, CA

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).
Months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in September
Foresthill, CA

Average visibility in September - Foresthill, CA
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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