September weather forecast and climate
Folsom, CA

Weather in September

September, the first month of the autumn, in Folsom, is still a tropical month, with average temperature varying between 58.5°F (14.7°C) and 87.4°F (30.8°C).

Temperature

In Folsom, California, the average high-temperature in September is almost the same as in August - a still hot 87.4°F (30.8°C). In Folsom, the average low-temperature is 58.5°F (14.7°C).

Heat index

The average heat index in September is evaluated at a hot 87.6°F (30.9°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. 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. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In Folsom, the average relative humidity in September is 42%.

Rainfall

In September, in Folsom, the rain falls for 2.1 days. Throughout September, 0.2" (5mm) of precipitation is accumulated. Throughout the year, in Folsom, California, there are 70.2 rainfall days, and 13.43" (341mm) of precipitation is accumulated.

Snowfall

January through November are months without snowfall in Folsom.

Daylight

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

Sunshine

The average sunshine is 11.3h.

UV index

In Folsom, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 Folsom?

In September, in Folsom, the average high-temperature is 87.4°F (30.8°C), and the average low-temperature is 58.5°F (14.7°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), that takes the relative humidity and factores it into the air temperature reading, in September is appraised at 87.6°F (30.9°C).

What is the average humidity in September in Folsom?

The average relative humidity in September in Folsom, California, is 42%.

How many days does it rain in September in Folsom?

In Folsom, California, during September, the rain falls for 2.1 days and regularly aggregates up to 0.2" (5mm) of precipitation.

When it does not snow in Folsom?

January through November are months without snowfall.

What is the average length of the day in September in Folsom?

In Folsom, California, the average length of the day in September is 12.4h.

How long on average sun shines in September in Folsom?

In September, the average sunshine is 11.3h.

How high is the UV index in September in Folsom?

In September, the average daily maximum UV index in Folsom, California, is 5. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.

Average temperature in September
Folsom, CA

Average temperature in September - Folsom, CA
  • Average high temperature in September: 87.4°F

The warmest month (with the highest average high temperature) is July (93.7°F).
The month with the lowest average high temperature is December (54°F).

  • Average low temperature in September: 58.5°F

The month with the highest average low temperature is August (59.9°F).
The coldest month (with the lowest average low temperature) is December (40.1°F).

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Average pressure in September
Folsom, CA

Average pressure in September - Folsom, CA
  • Average pressure in September: 29.92"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in September
Folsom, CA

Average wind speed in September - Folsom, CA
  • Average wind speed in September: 3.9mph

The windiest month (with the highest average wind speed) is February (5.5mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).

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Average humidity in September
Folsom, CA

Average humidity in September - Folsom, CA
  • Average humidity in September: 42%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (41%).

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Average rainfall in September
Folsom, CA

Average rainfall in September - Folsom, CA
  • Average rainfall in September: 0.2"

The wettest month (with the highest rainfall) is March (2.48").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Folsom, CA

Average rainfall days in September - Folsom, CA
  • Average rainfall days in September: 2.1 days

The month with the highest number of rainy days is March (12.9 days).
The month with the least rainy days is July (1.2 days).

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Average snowfall in September
Folsom, CA

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

The month with the highest snowfall is December (0.04").
Months with the least snowfall are January, February, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Folsom, CA

Average snowfall days in September - Folsom, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (0.2 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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

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

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 11.3h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days in September
Folsom, CA

Average sunshine days in September - Folsom, CA
  • Average sunshine days in September: 27.1 days

The month with the most sunshine days is July (29.1 days).
The month with the least sunshine days is March (17.3 days).

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Average UV index in September
Folsom, CA

Average UV index in September - Folsom, CA
  • Average UV index in September: 5

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Folsom, CA

Average cloud cover in September - Folsom, CA
  • Average cloud cover in September: 8

The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in September
Folsom, CA

Average visibility in September - Folsom, 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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