September weather forecast and climate
Glendale, CA

The central business district area of Glendale in California
The central business district area of Glendale in California

Weather in September

September, the first month of the autumn, in Glendale, is still a warm month, with temperature in the range of an average high of 83.8°F (28.8°C) and an average low of 63.1°F (17.3°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a still moderately hot 83.8°F (28.8°C). In Glendale, the average low-temperature is 63.1°F (17.3°C).

Heat index

The average heat index in September is calculated to 85.3°F (29.6°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, differences in body mass, height, and shape, wind, and pregnancy affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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 Glendale, the average relative humidity is 52%.

Rainfall

In Glendale, during September, the rain falls for 2.9 days and regularly aggregates up to 0.16" (4mm) of precipitation. In Glendale, California, during the entire year, the rain falls for 50.4 days and collects up to 8.35" (212mm) of precipitation.

Snowfall

In Glendale snow does not fall in January through November.

Daylight

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

Sunshine

The average sunshine in Glendale, California, is 10.8h.

UV index

Months with the highest UV index are June through September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Glendale?

The average high-temperature, in September, in Glendale, California, is 83.8°F (28.8°C), while the average low-temperature is 63.1°F (17.3°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that represents influence of the relative humidity to air temperaure, is estimated at 85.3°F (29.6°C).

What is the average humidity in September in Glendale?

The average relative humidity in September is 52%.

How many days does it rain in September in Glendale?

In September, in Glendale, California, the rain falls for 2.9 days. Throughout September, 0.16" (4mm) of precipitation is accumulated.

When it does not snow in Glendale?

In Glendale snow does not fall in January through November.

What is the average length of the day in September in Glendale?

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

How long on average sun shines in September in Glendale?

In Glendale, California, the average sunshine in September is 10.8h.

What is the month with the highest UV index in Glendale?

Months with the highest UV index are June through September, with an average maximum UV index of 6.

How high is the UV index in September in Glendale?

In September, the average daily maximum UV index in Glendale is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Glendale, CA

Average temperature in September - Glendale, CA
  • Average high temperature in September: 83.8°F

The warmest month (with the highest average high temperature) is August (85.6°F).
The month with the lowest average high temperature is December (62.4°F).

  • Average low temperature in September: 63.1°F

The month with the highest average low temperature is August (64.8°F).
The coldest month (with the lowest average low temperature) is December (47.3°F).

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Average pressure in September
Glendale, CA

Average pressure in September - Glendale, CA
  • Average pressure in September: 29.89"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in September
Glendale, CA

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

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

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Average humidity in September
Glendale, CA

Average humidity in September - Glendale, CA
  • Average humidity in September: 52%

The month with the highest relative humidity is June (60%).
The month with the lowest relative humidity is November (48%).

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Average rainfall in September
Glendale, CA

Average rainfall in September - Glendale, CA
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Glendale, CA

Average rainfall days in September - Glendale, CA
  • Average rainfall days in September: 2.9 days

The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (1.1 days).

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Average snowfall days in September
Glendale, CA

Average snowfall days in September - Glendale, 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
Glendale, CA

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

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 10.8h

Months with the most sunshine are June and July (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 6.9).

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Average sunshine days in September
Glendale, CA

Average sunshine days in September - Glendale, CA
  • Average sunshine days in September: 25 days

The month with the most sunshine days is June (26.9 days).
The month with the least sunshine days is February (21 days).

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Average UV index in September
Glendale, CA

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

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in September
Glendale, CA

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

Months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in September
Glendale, CA

Average visibility in September - Glendale, 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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