September weather forecast and climate
Thermalito, CA

Weather in September

The first month of the autumn, September, is still a hot month in Thermalito, California, with average temperature fluctuating between 61°F (16.1°C) and 88.9°F (31.6°C).

Temperature

In Thermalito, the average high-temperature in September marginally drops, from a tropical 94.6°F (34.8°C) in August, to a still hot 88.9°F (31.6°C). In September, in Thermalito, the average low-temperature is 61°F (16.1°C).

Humidity

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

Rainfall

In Thermalito, it is raining for 2.3 days, with typically 0.31" (8mm) of accumulated precipitation. In Thermalito, during the entire year, the rain falls for 80.4 days and collects up to 24.21" (615mm) of precipitation.

Snowfall

January through November are months without snowfall in Thermalito.

Daylight

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

Sunshine

In Thermalito, the average sunshine is 11.2h.

UV index

In September, the average daily maximum UV index in Thermalito is 5. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Thermalito?

In Thermalito, in September, the average high-temperature is 88.9°F (31.6°C), and the average low-temperature is 61°F (16.1°C).

What is the average humidity in September in Thermalito?

The average relative humidity in September is 34%.

How much does it rain in Thermalito in September?

In Thermalito, in September, during 2.3 rainfall days, 0.31" (8mm) of precipitation is typically accumulated.

When it does not snow in Thermalito?

In Thermalito snow does not fall in January through November.

How many hours of daylight does Thermalito have in September?

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

How many hours of sunshine does Thermalito have in September?

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

What is the UV index intensity in September in Thermalito?

In September, the average daily maximum UV index 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
Thermalito, CA

Average temperature in September - Thermalito, 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).

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Average pressure in September
Thermalito, CA

Average pressure in September - Thermalito, 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
Thermalito, CA

Average wind speed in September - Thermalito, 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).

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Average humidity in September
Thermalito, CA

Average humidity in September - Thermalito, 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%).

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Average rainfall in September
Thermalito, CA

Average rainfall in September - Thermalito, 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").

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Average rainfall days in September
Thermalito, CA

Average rainfall days in September - Thermalito, 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).

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Average snowfall days in September
Thermalito, CA

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

The month with the highest number of snowfall days is December (0.1 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
Thermalito, CA

Average daylight in September / Average sunshine in September - Thermalito, 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: 9.4h).

  • Average sunshine in September: 11.2h

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
Thermalito, CA

Average sunshine days in September - Thermalito, 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).

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Average UV index in September
Thermalito, CA

Average UV index in September - Thermalito, 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
Thermalito, CA

Average cloud cover in September - Thermalito, 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
Thermalito, CA

Average visibility in September - Thermalito, 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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