September weather forecast
Thermal, CA

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Weather in September

The first month of the autumn, September, is still a tropical month in Thermal, California, with temperature in the range of an average low of 72°F (22.2°C) and an average high of 88.7°F (31.5°C).

Temperature

With September's onset, the weather reveals a slight temperature decrease, transitioning from 94.6°F (34.8°C) in August to a still tropical 88.7°F (31.5°C). In September, Thermal experiences an average nighttime temperature of 72°F (22.2°C).

Humidity

In Thermal, the average relative humidity in September is 33%.

Rainfall

In Thermal, in September, it is raining for 5 days, with typically 0.31" (8mm) of accumulated precipitation. In Thermal, during the entire year, the rain falls for 46.2 days and collects up to 4.09" (104mm) of precipitation.

Daylight

In September, the average length of the day is 12h and 22min.
On the first day of September, sunrise is at 6:19 am and sunset at 7:09 pm. On the last day of the month, sunrise is at 6:38 am and sunset at 6:29 pm PDT.

Sunshine

In September, the average sunshine is 10.4h.

UV index

In Thermal, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 7 transforms into these recommendations:
Stand by precautions and apply sun safety measures. Evading sunburn is of great importance. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Updated: Jun 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot does it get in September?

In Thermal, 88.7°F (31.5°C) is the average high-temperature and 72°F (22.2°C) is the average low-temperature during September.

What is the average humidity in September?

In September, the average relative humidity is 33%.

How many days does it rain in September?

In September, the rain falls for 5 days. Throughout September, 0.31" (8mm) of precipitation is accumulated.

What is the average length of the day in September?

The average day length in September is 12h and 22min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:19 am and sunset at 7:09 pm. On the last day of the month, sunrise is at 6:38 am and sunset at 6:29 pm PDT.

How many hours of sunshine does Thermal have in September?

In September, the average sunshine duration is 10.4h.

What is the UV index reading in September?

The average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Thermal, CA

Average temperature in September - Thermal, CA
  • Average high temperature in September: 88.7°F

The warmest month (with the highest average high temperature) is July (95.4°F).
The month with the lowest average high temperature is December (60.6°F).

  • Average low temperature in September: 72°F

The month with the highest average low temperature is August (76.3°F).
The coldest month (with the lowest average low temperature) is December (46.8°F).

Average pressure in September
Thermal, CA

Average pressure in September - Thermal, CA
  • Average pressure in September: 29.83"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.8"Hg).

Average wind speed in September
Thermal, CA

Average wind speed in September - Thermal, CA
  • Average wind speed in September: 6.4mph

The windiest month (with the highest average wind speed) is May (8.2mph).
The calmest month (with the lowest average wind speed) is January (5.5mph).

Average humidity in September
Thermal, CA

Average humidity in September - Thermal, CA
  • Average humidity in September: 33%

The month with the highest relative humidity is December (46%).
The month with the lowest relative humidity is June (29%).

Average rainfall in September
Thermal, CA

Average rainfall in September - Thermal, CA
  • Average rainfall in September: 0.31"

The wettest month (with the highest rainfall) is July (0.79").
The driest months (with the least rainfall) are May and June (0.12").

Average rainfall days in September
Thermal, CA

Average rainfall days in September - Thermal, CA
  • Average rainfall days in September: 5 days

The month with the highest number of rainy days is July (6.9 days).
The month with the least rainy days is June (1.5 days).

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

Average daylight in September / Average sunshine in September - Thermal, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 10h and 2min

The month with the most sunshine is June (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 6min).

Average sunshine days in September
Thermal, CA

Average sunshine days in September - Thermal, CA
  • Average sunshine days in September: 23.1 days

The month with the most sunshine days is October (27.4 days).
The month with the least sunshine days is July (19.4 days).

Average UV index in September
Thermal, CA

Average UV index in September - Thermal, CA
  • Average UV index in September: 7

The month with the highest UV index is July (UV index 8).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in September
Thermal, CA

Average cloud cover in September - Thermal, CA
  • Average cloud cover in September: 6

The month with the most cloud cover is December (Cloud cover 17).
The month with the least cloud cover is June (Cloud cover 4).

Average visibility in September
Thermal, CA

Average visibility in September - Thermal, 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).

Thermal, California, USA

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