September weather forecast
Foresthill, CA

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Weather in September

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

Temperature

The onset of September brings a small shift in high-temperatures, falling from a hot 86.9°F (30.5°C) in August to a warm 81.1°F (27.3°C). Foresthill experiences a significant downturn from peak daytime temperatures throughout September, with the average low-temperature dipping to a cool 53.1°F (11.7°C).

Heat index

During September, the heat index is computed to be 80.6°F (27°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Keep in mind the heat index values are meant for areas in shade and with light wind. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a metric representing the sensation of warmth when air temperature and moisture come together. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.

Humidity

In September, the average relative humidity in Foresthill is 41%.

Rainfall

In Foresthill, during September, the rain falls for 3.5 days and regularly aggregates up to 0.35" (9mm) of 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

In Foresthill, snow does not fall in June through October.

Daylight

The average length of the day in September in Foresthill is 12h and 26min.
On the first day of the month, sunrise is at 6:32 am and sunset at 7:33 pm. On the last day of September, in Foresthill, sunrise is at 6:59 am and sunset at 6:46 pm PDT.

Sunshine

The average sunshine in September in Foresthill, California, is 11.2h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Exercise prevention - Precautions against solar damage are endorsed. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.

Frequently asked questions

What are September temperatures in Foresthill?

In September, the average high-temperature and low-temperature in Foresthill are 81.1°F (27.3°C) and 53.1°F (11.7°C) respectively. In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is computed to be 80.6°F (27°C).

What is the average humidity in September in Foresthill?

The average relative humidity in September in Foresthill is 41%.

How many days does it rain in September in Foresthill?

In Foresthill, California, in September, during 3.5 rainfall days, 0.35" (9mm) of precipitation is typically accumulated.

When it does not snow in Foresthill?

In Foresthill, snow does not fall in June through October.

How many hours of daylight does Foresthill have in September?

In Foresthill, the average day length in September is 12h and 26min.

When is the sunrise / sunset in September in Foresthill?

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.

How long on average sun shines in September in Foresthill?

The average sunshine duration in September in Foresthill is 11.2h.

What is the UV index reading in September in Foresthill?

The average daily maximum UV index in September in Foresthill, California, is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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).

Average pressure in September
Foresthill, CA

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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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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