September weather forecast
South Oroville, CA

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Weather in September

The first month of the autumn, September, is also a hot month in South Oroville, California, with an average temperature ranging between min 61°F (16.1°C) and max 88.9°F (31.6°C).

Temperature

As August shifts into September, a minor alteration in temperatures is observed, with average highs reducing from a tropical 94.6°F (34.8°C) to a still hot 88.9°F (31.6°C). Despite a stark disparity with daily highs, South Oroville records an average nighttime temperature of 61°F (16.1°C) in September.

Humidity

In South Oroville, the average relative humidity in September is 34%.

Rainfall

In South Oroville, during September, the rain falls for 2.3 days and regularly aggregates up to 0.31" (8mm) of precipitation. Throughout the year, there are 80.4 rainfall days, and 24.21" (615mm) of precipitation is accumulated.

Snowfall

In South Oroville, snow does not fall in January through November.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:49 pm PDT.

Sunshine

In September, the average sunshine is 11.2h.

UV index

In South Oroville, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index of 5 during September translates into these guidelines:
Make use of precautions - It is urged to ward off sun damage. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Experience reduced UV exposure by about half when donning a wide-brim hat.
Updated: Jun 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in September?

An average high-temperature, in September, in South Oroville, is 88.9°F (31.6°C) and the average low-temperature is 61°F (16.1°C). In June, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is appraised at 87.8°F (31°C).

What is the average humidity in September?

In South Oroville, the average relative humidity in September is 34%.

How many days does it rain in September?

In South Oroville, during September, the rain falls for 2.3 days and regularly aggregates up to 0.31" (8mm) of precipitation.

When it does not snow?

January through November are months without snowfall.

How many hours of daylight does South Oroville have in September?

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

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:49 pm PDT.

How long on average sun shines in September?

In South Oroville, the average sunshine duration in September is 11.2h.

What is the UV index intensity in September?

In South Oroville, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
South Oroville, CA

Average temperature in September - South Oroville, CA
  • Average high temperature in September: 88.9°F

The warmest month (with the highest average high temperature) is July (95.9°F).
The month with the lowest average high temperature is December (54.5°F).

  • Average low temperature in September: 61°F

The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is December (40.6°F).

Average pressure in September
South Oroville, CA

Average pressure in September - South Oroville, 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).

Average wind speed in September
South Oroville, CA

Average wind speed in September - South Oroville, CA
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is March (6.3mph).
The calmest months (with the lowest average wind speed) are August and November (5.2mph).

Average humidity in September
South Oroville, CA

Average humidity in September - South Oroville, CA
  • Average humidity in September: 34%

The month with the highest relative humidity is March (72%).
The month with the lowest relative humidity is July (33%).

Average rainfall in September
South Oroville, CA

Average rainfall in September - South Oroville, CA
  • Average rainfall in September: 0.31"

The wettest month (with the highest rainfall) is March (4.61").
The driest month (with the least rainfall) is July (0.04").

Average rainfall days in September
South Oroville, CA

Average rainfall days in September - South Oroville, CA
  • Average rainfall days in September: 2.3 days

The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is July (1.3 days).

Average snowfall days in September
South Oroville, CA

Average snowfall days in September - South Oroville, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

Average daylight in September /
Average sunshine in September
South Oroville, CA

Average daylight in September / Average sunshine in September - South Oroville, 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 24min).

  • 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 December (Average sunshine: 5h and 48min).

Average sunshine days in September
South Oroville, CA

Average sunshine days in September - South Oroville, 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 (15.5 days).

Average UV index in September
South Oroville, CA

Average UV index in September - South Oroville, 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).

Average cloud cover in September
South Oroville, CA

Average cloud cover in September - South Oroville, 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).

Average visibility in September
South Oroville, CA

Average visibility in September - South Oroville, 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).

South Oroville, California, USA

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