September weather forecast and climate
Clearlake Oaks, CA

Weather in September

September, the first month of the autumn, in Clearlake Oaks, is also a moderately hot month, with average temperature ranging between max 85.1°F (29.5°C) and min 55.8°F (13.2°C).

Temperature

In September, the average high-temperature is almost the same as in August - a warm 85.1°F (29.5°C). In September, in Clearlake Oaks, the average low-temperature is 55.8°F (13.2°C).

Heat index

In September, the average heat index is appraised at 85.5°F (29.7°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 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, pregnancy, differences in body mass, height, and shape, and metabolic differences affect individual temperature impact. 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 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

In Clearlake Oaks, the average relative humidity in September is 45%.

Rainfall

In September, in Clearlake Oaks, California, the rain falls for 2.1 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. Throughout the year, there are 79.8 rainfall days, and 17.44" (443mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

The average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine is 11.1h.

UV index

The average daily maximum UV index in Clearlake Oaks is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to the UV radiation for the average person.
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Clearlake Oaks?

The average high-temperature, in September, in Clearlake Oaks, California, is 85.1°F (29.5°C), while the average low-temperature is 55.8°F (13.2°C). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that factores the actual air temperature with the relative humidity, is estimated at 85.5°F (29.7°C).

What is the average humidity in September in Clearlake Oaks?

In Clearlake Oaks, the average relative humidity in September is 45%.

How much does it rain in Clearlake Oaks in September?

In Clearlake Oaks, California, in September, during 2.1 rainfall days, 0.08" (2mm) of precipitation is typically accumulated.

When it does not snow in Clearlake Oaks?

In Clearlake Oaks snow does not fall in April through October.

How many hours of daylight does Clearlake Oaks have in September?

In Clearlake Oaks, the average length of the day in September is 12.4h.

How many hours of sunshine does Clearlake Oaks have in September?

The average sunshine in September in Clearlake Oaks, California, is 11.1h.

How high is the UV index in September in Clearlake Oaks?

In Clearlake Oaks, California, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.

Average temperature in September
Clearlake Oaks, CA

Average temperature in September - Clearlake Oaks, CA
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is December (52.7°F).

  • Average low temperature in September: 55.8°F

The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is December (38.1°F).

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Average pressure in September
Clearlake Oaks, CA

Average pressure in September - Clearlake Oaks, CA
  • Average pressure in September: 29.92"

The month with the highest atmospheric pressure is January (30.14").
Months with the lowest atmospheric pressure are June and August (29.91").

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Average wind speed in September
Clearlake Oaks, CA

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

The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).

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Average humidity in September
Clearlake Oaks, CA

Average humidity in September - Clearlake Oaks, CA
  • Average humidity in September: 45%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (44%).

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Average rainfall in September
Clearlake Oaks, CA

Average rainfall in September - Clearlake Oaks, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is February (3.7").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Clearlake Oaks, CA

Average rainfall days in September - Clearlake Oaks, CA
  • Average rainfall days in September: 2.1 days

The month with the highest number of rainy days is March (13.9 days).
Months with the least rainy days are July and August (1.1 days).

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Average snowfall in September
Clearlake Oaks, CA

Average snowfall in September - Clearlake Oaks, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.51").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Clearlake Oaks, CA

Average snowfall days in September - Clearlake Oaks, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.9 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Clearlake Oaks, CA

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

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 11.1h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.3h).

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Average sunshine days in September
Clearlake Oaks, CA

Average sunshine days in September - Clearlake Oaks, CA
  • Average sunshine days in September: 27.1 days

The month with the most sunshine days is July (29.4 days).
The month with the least sunshine days is March (15.8 days).

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Average UV index in September
Clearlake Oaks, CA

Average UV index in September - Clearlake Oaks, CA
  • Average UV index in September: 5

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are November and December (UV index 2).

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Average cloud cover in September
Clearlake Oaks, CA

Average cloud cover in September - Clearlake Oaks, CA
  • Average cloud cover in September: 9

The month with the most cloud cover is March (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in September
Clearlake Oaks, CA

Average visibility in September - Clearlake Oaks, 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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