September weather forecast
Glen Avon, CA

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Weather in September

September, the first month of the autumn in Glen Avon, is still a hot month, with an average temperature varying between 64°F (17.8°C) and 88.3°F (31.3°C).

Temperature

With September's advent, Glen Avon sees an average high-temperature of a still tropical 88.3°F (31.3°C), subtly shifted from August's 91.2°F (32.9°C). Glen Avon's September nights cool down significantly from the day's heat, to an average low-temperature of 64°F (17.8°C).

Heat index

In September, the average heat index is estimated at a tropical 89.6°F (32°C). With extended exposure and activity, one might feel exhausted and experience heat cramps.
Heat index values are typically calculated for conditions of shade and a light breeze. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', provides an understanding of perceived warmth by combining temperature and relative humidity. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.

Humidity

In September, the average relative humidity is 45%.

Rainfall

In September, the rain falls for 2.1 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. Throughout the year, there are 49 rainfall days, and 7.32" (186mm) of precipitation is accumulated.

Snowfall

In Glen Avon, snow does not fall in January, March through December.

Daylight

In September, the average length of the day is 12h and 22min.
On the first day of September, sunrise is at 6:24 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:35 pm PDT.

Sunshine

The average sunshine in September is 10.6h.

UV index

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: A maximum daily UV index of 6 during September morphs into the following directions:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Updated: Jul 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot does it get in September?

The high-temperature, in September, in Glen Avon, records 88.3°F (31.3°C), while the low-temperature is 64°F (17.8°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in September is estimated at 89.6°F (32°C).

What is the average humidity in September?

In Glen Avon, the average relative humidity in September is 45%.

How much does it rain in September?

In Glen Avon, in September, it is raining for 2.1 days, with typically 0.08" (2mm) of accumulated precipitation.

When it does not snow?

In Glen Avon, snow does not fall in January, March through December.

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 6:24 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:35 pm PDT.

How many hours of sunshine does Glen Avon have in September?

The average sunshine duration in September is 10.6h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unsafe 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
Glen Avon, CA

Average temperature in September - Glen Avon, CA
  • Average high temperature in September: 88.3°F

The warmest month (with the highest average high temperature) is August (91.2°F).
The month with the lowest average high temperature is December (63.3°F).

  • Average low temperature in September: 64°F

The month with the highest average low temperature is August (66.4°F).
The coldest month (with the lowest average low temperature) is December (45.9°F).

Average pressure in September
Glen Avon, CA

Average pressure in September - Glen Avon, CA
  • Average pressure in September: 29.88"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

Average wind speed in September
Glen Avon, CA

Average wind speed in September - Glen Avon, CA
  • Average wind speed in September: 4.4mph

The windiest month (with the highest average wind speed) is May (5.6mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

Average humidity in September
Glen Avon, CA

Average humidity in September - Glen Avon, CA
  • Average humidity in September: 45%

The month with the highest relative humidity is May (56%).
The month with the lowest relative humidity is August (43%).

Average rainfall in September
Glen Avon, CA

Average rainfall in September - Glen Avon, CA
  • Average rainfall in September: 0.08"

The wettest months (with the highest rainfall) are February and December (1.61").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in September
Glen Avon, CA

Average rainfall days in September - Glen Avon, CA
  • Average rainfall days in September: 2.1 days

The month with the highest number of rainy days is March (7.7 days).
The month with the least rainy days is June (1.1 days).

Average snowfall days in September
Glen Avon, CA

Average snowfall days in September - Glen Avon, CA
  • Average snowfall days in September: 0 days

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

Average daylight in September /
Average sunshine in September
Glen Avon, CA

Average daylight in September / Average sunshine in September - Glen Avon, 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: 9h and 54min).

  • Average sunshine in September: 10h and 4min

The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 48min).

Average sunshine days in September
Glen Avon, CA

Average sunshine days in September - Glen Avon, CA
  • Average sunshine days in September: 25.8 days

The month with the most sunshine days is June (27.9 days).
The month with the least sunshine days is February (21.6 days).

Average UV index in September
Glen Avon, CA

Average UV index in September - Glen Avon, CA
  • Average UV index in September: 6

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

Average cloud cover in September
Glen Avon, CA

Average cloud cover in September - Glen Avon, CA
  • Average cloud cover in September: 7

The months with the most cloud cover are February and March (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 5).

Average visibility in September
Glen Avon, CA

Average visibility in September - Glen Avon, 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).

Glen Avon, California, USA

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