September weather forecast
Coloma, CA

Weather in September

September, the first month of the autumn in Coloma, is still a warm month, with temperature in the range of an average low of 54.5°F (12.5°C) and an average high of 82.4°F (28°C).

Temperature

In September, the average high-temperature slightly decreases from a hot 88.3°F (31.3°C) in August to a warm 82.4°F (28°C). The average low-temperature, in Coloma, is 54.5°F (12.5°C).

Heat index

The average heat index in September is computed to be 82.4°F (28°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values 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 calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like differences in body mass, height, and shape, pregnancy, clothing, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index 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 September in Coloma is 42%.

Rainfall

In Coloma, it is raining for 2.6 days, with typically 0.28" (7mm) of accumulated precipitation. In Coloma, during the entire year, the rain falls for 86.4 days and collects up to 29.69" (754mm) of precipitation.

Snowfall

In Coloma, snow does not fall in May through October.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of the month, sunrise is at 6:32 am and sunset at 7:34 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:48 pm PDT.

Sunshine

In Coloma, California, the average sunshine in September is 11.3h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
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 Coloma?

In Coloma, California, in September, the average high-temperature is 82.4°F (28°C), and the average low-temperature is 54.5°F (12.5°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines relative humidity and air temperature, in September is computed to be 82.4°F (28°C).

What is the average humidity in September in Coloma?

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

How much does it rain in Coloma in September?

In Coloma, during September, the rain falls for 2.6 days and regularly aggregates up to 0.28" (7mm) of precipitation.

When it does not snow in Coloma?

May through October are months without snowfall in Coloma.

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

In Coloma, California, the average day length in September is 12h and 25min.

When is the sunrise / sunset in September in Coloma?

On the first day of September in Coloma, California, sunrise is at 6:32 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:48 pm PDT.

How long on average sun shines in September in Coloma?

In September, the average sunshine duration in Coloma, California, is 11.3h.

What is the UV index reading in September in Coloma?

In Coloma, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Coloma, CA

Average temperature in September - Coloma, CA
  • Average high temperature in September: 82.4°F

The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is December (50.7°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is December (36°F).

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Average pressure in September
Coloma, CA

Average pressure in September - Coloma, CA
  • Average pressure in September: 29.93"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).

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Average wind speed in September
Coloma, CA

Average wind speed in September - Coloma, CA
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is February (6mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

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Average humidity in September
Coloma, CA

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

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is July (39%).

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Average rainfall in September
Coloma, CA

Average rainfall in September - Coloma, CA
  • Average rainfall in September: 0.28"

The wettest month (with the highest rainfall) is March (5.98").
The driest month (with the least rainfall) is July (0").

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Average rainfall days in September
Coloma, CA

Average rainfall days in September - Coloma, CA
  • Average rainfall days in September: 2.6 days

The month with the highest number of rainy days is March (15.6 days).
The month with the least rainy days is July (0.9 days).

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Average snowfall in September
Coloma, CA

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

The month with the highest snowfall is February (5.16").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Coloma, CA

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

The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Coloma, CA
  • Average daylight in September: 12h and 25min

The month with the longest days is June (Average daylight: 14h and 50min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 11h and 18min

The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

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Average sunshine days in September
Coloma, CA

Average sunshine days in September - Coloma, CA
  • Average sunshine days in September: 26.9 days

The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (13.8 days).

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Average UV index in September
Coloma, CA

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

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is November (UV index 2).

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Average cloud cover in September
Coloma, CA

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

The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in September
Coloma, CA

Average visibility in September - Coloma, 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).

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