September weather forecast
Roseville, CA

Weather in September

The first month of the autumn, September, is also a hot month in Roseville, California, with an average temperature ranging between min 58.8°F (14.9°C) and max 87.8°F (31°C).

Temperature

In September, the average high-temperature is practically the same as in August - a still hot 87.8°F (31°C). In September, the average low-temperature is 58.8°F (14.9°C).

Heat index

In September, the average heat index is estimated at a tropical 87.8°F (31°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. 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', 'apparent temperature', 'felt air temperature', or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, wind, differences in body mass, height, and shape), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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

The average relative humidity in September is 42%.

Rainfall

In Roseville, California, it is raining for 2.4 days, with typically 0.2" (5mm) of accumulated precipitation. In Roseville, during the entire year, the rain falls for 78.4 days and collects up to 19.09" (485mm) of precipitation.

Snowfall

January through November are months without snowfall in Roseville.

Daylight

The average length of the day in September in Roseville is 12h and 25min.
On the first day of the month, sunrise is at 6:34 am and sunset at 7:35 pm. On the last day of September, in Roseville, California, sunrise is at 7:00 am and sunset at 6:50 pm PDT.

Sunshine

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

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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 Roseville?

In Roseville, California, in September, the average high-temperature is 87.8°F (31°C), and the average low-temperature is 58.8°F (14.9°C). in September, the average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 87.8°F (31°C).

What is the average humidity in September in Roseville?

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

How many days does it rain in September in Roseville?

In Roseville, in September, during 2.4 rainfall days, 0.2" (5mm) of precipitation is typically accumulated.

When it does not snow in Roseville?

In Roseville, snow does not fall in January through November.

How many hours of daylight does Roseville have in September?

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

When is the sunrise / sunset in September in Roseville?

On the first day of September, sunrise is at 6:34 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:50 pm PDT.

How many hours of sunshine does Roseville have in September?

In September, the average sunshine duration in Roseville, California, is 11.2h.

What is the UV index reading in September in Roseville?

In Roseville, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Roseville, CA

Average temperature in September - Roseville, CA
  • Average high temperature in September: 87.8°F

The warmest month (with the highest average high temperature) is July (94.1°F).
The month with the lowest average high temperature is December (54.1°F).

  • Average low temperature in September: 58.8°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (40.5°F).

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Average pressure in September
Roseville, CA

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

Average wind speed in September - Roseville, CA
  • Average wind speed in September: 4mph

The windiest month (with the highest average wind speed) is February (5.7mph).
The calmest month (with the lowest average wind speed) is September (4mph).

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Average humidity in September
Roseville, CA

Average humidity in September - Roseville, 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
Roseville, CA

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

The wettest month (with the highest rainfall) is March (3.58").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Roseville, CA

Average rainfall days in September - Roseville, CA
  • Average rainfall days in September: 2.4 days

The month with the highest number of rainy days is March (14.1 days).
The month with the least rainy days is July (1.1 days).

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Average snowfall days in September
Roseville, CA

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

The month with the highest number of snowfall days is December (0.2 days).
The 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
Roseville, CA

Average daylight in September / Average sunshine in September - Roseville, 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 31min).

  • Average sunshine in September: 11h and 12min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in September
Roseville, CA

Average sunshine days in September - Roseville, CA
  • Average sunshine days in September: 27 days

The month with the most sunshine days is July (29.3 days).
The month with the least sunshine days is March (15.8 days).

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Average UV index in September
Roseville, CA

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

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

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Average cloud cover in September
Roseville, CA

Average cloud cover in September - Roseville, 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
Roseville, CA

Average visibility in September - Roseville, 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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