September weather forecast and climate
Montebello, CA

Weather in September

The first month of the autumn, September, is still a warm month in Montebello, California, with average temperature ranging between max 84.9°F (29.4°C) and min 64.8°F (18.2°C).

Temperature

In Montebello, California, the average high-temperature is essentially the same as in August - a warm 84.9°F (29.4°C). In Montebello, in September, the average low-temperature is 64.8°F (18.2°C).

Heat index

The average heat index in September 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.
Note that heat index values are valued for light wind and location in the shade. 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', 'apparent temperature', 'feels like', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, metabolic differences, clothing, and wind affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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 Montebello, the average relative humidity is 53%.

Rainfall

In Montebello, during 2.3 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. Throughout the year, in Montebello, California, there are 40.9 rainfall days, and 6.18" (157mm) of precipitation is accumulated.

Daylight

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

Sunshine

In Montebello, California, the average sunshine in September is 10.6h.

UV index

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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 Montebello?

In September, the average high-temperature is 84.9°F (29.4°C), and the average low-temperature is 64.8°F (18.2°C). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), that combines air temperature and relative humidity, is calculated to 87.1°F (30.6°C).

What is the average humidity in September in Montebello?

In Montebello, California, the average relative humidity in September is 53%.

How much does it rain in Montebello in September?

In Montebello, California, in September, during 2.3 rainfall days, 0.12" (3mm) of precipitation is typically accumulated.

How many hours of daylight does Montebello have in September?

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

How many hours of sunshine does Montebello have in September?

In September, the average sunshine is 10.6h.

What is the UV index reading in September in Montebello?

In Montebello, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Montebello, CA

Average temperature in September - Montebello, CA
  • Average high temperature in September: 84.9°F

The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is December (64.9°F).

  • Average low temperature in September: 64.8°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (48.9°F).

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Average pressure in September
Montebello, CA

Average pressure in September - Montebello, 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
Montebello, CA

Average wind speed in September - Montebello, CA
  • Average wind speed in September: 4.7mph

The windiest month (with the highest average wind speed) is April (5.9mph).
The calmest months (with the lowest average wind speed) are August, September and October (4.7mph).

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Average humidity in September
Montebello, CA

Average humidity in September - Montebello, CA
  • Average humidity in September: 53%

The month with the highest relative humidity is June (62%).
The month with the lowest relative humidity is November (48%).

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Average rainfall in September
Montebello, CA

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

The wettest month (with the highest rainfall) is December (1.3").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Montebello, CA

Average rainfall days in September - Montebello, CA
  • Average rainfall days in September: 2.3 days

The month with the highest number of rainy days is March (6 days).
The month with the least rainy days is June (1.2 days).

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

Average daylight in September / Average sunshine in September - Montebello, 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: 10.6h

Months with the most sunshine are July and August (Average sunshine: 12h).
Months with the least sunshine are January, February and December (Average sunshine: 6.8).

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Average sunshine days in September
Montebello, CA

Average sunshine days in September - Montebello, CA
  • Average sunshine days in September: 26 days

The month with the most sunshine days is August (27.6 days).
The month with the least sunshine days is February (22.5 days).

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Average UV index in September
Montebello, CA

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

The month with the highest UV index is August (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in September
Montebello, CA

Average cloud cover in September - Montebello, CA
  • Average cloud cover in September: 9

Months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in September
Montebello, CA

Average visibility in September - Montebello, 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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