September weather forecast and climate
Glendora, CA

The beautiful city of Glendora, California, surrounded by the vast mountain ranges
The beautiful city of Glendora, California, surrounded by the vast mountain ranges

Weather in September

The first month of the autumn, September, is still a tropical month in Glendora, California, with temperature in the range of an average low of 63.5°F (17.5°C) and an average high of 86.2°F (30.1°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still hot 86.2°F (30.1°C). The average low-temperature, in Glendora, is 63.5°F (17.5°C).

Heat index

In September, the average heat index is appraised at a tropical 87.1°F (30.6°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. Exposure to direct sunshine can increase heat index values 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. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, wind, pregnancy). 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 especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In September, the average relative humidity is 46%.

Rainfall

In Glendora, it is raining for 2.2 days, with typically 0.12" (3mm) of accumulated precipitation. In Glendora, California, during the entire year, the rain falls for 44.9 days and collects up to 7.76" (197mm) of precipitation.

Snowfall

In Glendora, California, snow does not fall in January, March through December.

Daylight

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

Sunshine

In September, the average sunshine in Glendora is 10.8h.

UV index

In Glendora, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Glendora?

In Glendora, California, in September, the average high-temperature is 86.2°F (30.1°C), and the average low-temperature is 63.5°F (17.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), that calculates temperature value influenced by the moisture in the air, in September is evaluated at 87.1°F (30.6°C).

What is the average humidity in September in Glendora?

In September, the average relative humidity in Glendora is 46%.

How much does it rain in Glendora in September?

In Glendora, in September, it is raining for 2.2 days, with typically 0.12" (3mm) of accumulated precipitation.

When it does not snow in Glendora?

January, March through December are months without snowfall in Glendora.

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

The average length of the day in September in Glendora, California, is 12.4h.

How long on average sun shines in September in Glendora?

In Glendora, the average sunshine in September is 10.8h.

What is the UV index reading in September in Glendora?

The average daily maximum UV index in September in Glendora is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Glendora, CA

Average temperature in September - Glendora, CA
  • Average high temperature in September: 86.2°F

The warmest month (with the highest average high temperature) is August (88.7°F).
The month with the lowest average high temperature is December (61.5°F).

  • Average low temperature in September: 63.5°F

The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).

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Average pressure in September
Glendora, CA

Average pressure in September - Glendora, CA
  • Average pressure in September: 29.88"

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed in September
Glendora, CA

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

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

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Average humidity in September
Glendora, CA

Average humidity in September - Glendora, CA
  • Average humidity in September: 46%

Months with the highest relative humidity are March and May (55%).
Months with the lowest relative humidity are August and November (45%).

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Average rainfall in September
Glendora, CA

Average rainfall in September - Glendora, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is February (1.73").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Glendora, CA

Average rainfall days in September - Glendora, CA
  • Average rainfall days in September: 2.2 days

The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is June (1.1 days).

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Average snowfall days in September
Glendora, CA

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

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

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

Average daylight in September / Average sunshine in September - Glendora, 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).
The month with the least sunshine is February (Average sunshine: 6.9h).

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Average sunshine days in September
Glendora, CA

Average sunshine days in September - Glendora, CA
  • Average sunshine days in September: 26.7 days

The month with the most sunshine days is June (28.6 days).
The month with the least sunshine days is February (22.6 days).

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Average UV index in September
Glendora, CA

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

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).

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Average cloud cover in September
Glendora, CA

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

Months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).

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Average visibility in September
Glendora, CA

Average visibility in September - Glendora, 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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