September weather forecast
Truckhaven, CA

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Weather in September

September, the first month of the autumn in Truckhaven, is still a tropical month, with an average temperature varying between 66.9°F (19.4°C) and 87.3°F (30.7°C).

Temperature

In September, the meteorological conditions change slightly, with the average high-temperature moving from a tropical 93.7°F (34.3°C) in August to a still hot 87.3°F (30.7°C). In Truckhaven, the September nights cool down to an average low of 66.9°F (19.4°C).

Humidity

In September, the average relative humidity in Truckhaven is 38%.

Rainfall

In Truckhaven, during September, the rain falls for 6.2 days and regularly aggregates up to 0.71" (18mm) of precipitation. Throughout the year, there are 60.2 rainfall days, and 7.68" (195mm) of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 22min.
On the first day of the month, sunrise is at 6:18 am and sunset at 7:08 pm. On the last day of September, sunrise is at 6:38 am and sunset at 6:29 pm PDT.

Sunshine

The average sunshine in September is 10.4h.

UV index

In Truckhaven, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The average daily UV index of 6 in September transforms into the following instructions:
Use protective steps and abide by sun safety guidelines. Safeguarding against skin and eye harm is necessary. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is September?

The high-temperature, in September, in Truckhaven, records 87.3°F (30.7°C), while the low-temperature is 66.9°F (19.4°C).

What is the average humidity in September?

In September, the average relative humidity is 38%.

How many days does it rain in September?

In Truckhaven, in September, it is raining for 6.2 days, with typically 0.71" (18mm) of accumulated precipitation.

What is the average length of the day in September?

In September, the average day length is 12h and 22min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:18 am and sunset at 7:08 pm. On the last day of the month, sunrise is at 6:38 am and sunset at 6:29 pm PDT.

How long on average sun shines in September?

In September, the average sunshine duration is 10.4h.

How high is the UV index in September?

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unprotected exposure to 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
Truckhaven, CA

Average temperature in September - Truckhaven, CA
  • Average high temperature in September: 87.3°F

The warmest months (with the highest average high temperature) are July and August (93.7°F).
The month with the lowest average high temperature is December (59.4°F).

  • Average low temperature in September: 66.9°F

The month with the highest average low temperature is August (71.2°F).
The coldest month (with the lowest average low temperature) is December (43.3°F).

Average pressure in September
Truckhaven, CA

Average pressure in September - Truckhaven, CA
  • Average pressure in September: 29.84"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.82"Hg).

Average wind speed in September
Truckhaven, CA

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

The windiest month (with the highest average wind speed) is May (8.6mph).
The calmest month (with the lowest average wind speed) is January (5.2mph).

Average humidity in September
Truckhaven, CA

Average humidity in September - Truckhaven, CA
  • Average humidity in September: 38%

The month with the highest relative humidity is December (50%).
The months with the lowest relative humidity are June and August (34%).

Average rainfall in September
Truckhaven, CA

Average rainfall in September - Truckhaven, CA
  • Average rainfall in September: 0.71"

The wettest month (with the highest rainfall) is July (1.38").
The driest months (with the least rainfall) are May and June (0.12").

Average rainfall days in September
Truckhaven, CA

Average rainfall days in September - Truckhaven, CA
  • Average rainfall days in September: 6.2 days

The month with the highest number of rainy days is July (7.8 days).
The month with the least rainy days is June (1.8 days).

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

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

The month with the longest days is June (Average daylight: 14h and 18min).
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: 6h and 48min).

Average sunshine days in September
Truckhaven, CA

Average sunshine days in September - Truckhaven, CA
  • Average sunshine days in September: 22.3 days

The month with the most sunshine days is June (27.5 days).
The month with the least sunshine days is July (20.4 days).

Average UV index in September
Truckhaven, CA

Average UV index in September - Truckhaven, CA
  • Average UV index in September: 6

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in September
Truckhaven, CA

Average cloud cover in September - Truckhaven, CA
  • Average cloud cover in September: 7

The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is June (Cloud cover 5).

Average visibility in September
Truckhaven, CA

Average visibility in September - Truckhaven, 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).

Truckhaven, California, USA

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