September weather forecast and climate
El Monte, CA

Weather in September

September, the first month of the autumn, in El Monte, is also a hot month, with average temperature ranging between min 63.5°F (17.5°C) and max 86°F (30°C).

Temperature

In El Monte, the average high-temperature is relatively the same as in August - a still tropical 86°F (30°C). In September, in El Monte, the average low-temperature is 63.5°F (17.5°C).

Heat index

In September, the average heat index is estimated at a tropical 87.8°F (31°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 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', 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, wind, and pregnancy 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 especially crucial for babies and toddlers. 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 September, the average relative humidity is 50%.

Rainfall

In El Monte, California, during 2.9 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. In El Monte, during the entire year, the rain falls for 43.3 days and collects up to 5.91" (150mm) of precipitation.

Daylight

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

Sunshine

The average sunshine in September is 10.7h.

UV index

In El Monte, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in El Monte?

In El Monte, California, in September, the average high-temperature is 86°F (30°C), and the average low-temperature is 63.5°F (17.5°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), that combines both air temperature and relative humidity, in September is evaluated at 87.8°F (31°C).

What is the average humidity in September in El Monte?

The average relative humidity in September in El Monte is 50%.

How many days does it rain in September in El Monte?

In El Monte, California, in September, during 2.9 rainfall days, 0.12" (3mm) of precipitation is typically accumulated.

How many hours of daylight does El Monte have in September?

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

How many hours of sunshine does El Monte have in September?

In September, the average sunshine is 10.7h.

How high is the UV index in September in El Monte?

In El Monte, California, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
El Monte, CA

Average temperature in September - El Monte, CA
  • Average high temperature in September: 86°F

The warmest month (with the highest average high temperature) is August (87.6°F).
The month with the lowest average high temperature is December (63.5°F).

  • Average low temperature in September: 63.5°F

The month with the highest average low temperature is August (64.9°F).
The coldest months (with the lowest average low temperature) are February and December (47.3°F).

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Average pressure in September
El Monte, CA

Average pressure in September - El Monte, 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
El Monte, CA

Average wind speed in September - El Monte, CA
  • Average wind speed in September: 4.5mph

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest months (with the lowest average wind speed) are September and October (4.5mph).

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Average humidity in September
El Monte, CA

Average humidity in September - El Monte, CA
  • Average humidity in September: 50%

The month with the highest relative humidity is June (58%).
The month with the lowest relative humidity is November (46%).

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Average rainfall in September
El Monte, CA

Average rainfall in September - El Monte, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is December (1.22").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
El Monte, CA

Average rainfall days in September - El Monte, CA
  • Average rainfall days in September: 2.9 days

The month with the highest number of rainy days is March (5.3 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
El Monte, CA

Average daylight in September / Average sunshine in September - El Monte, 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: 10.7h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is February (Average sunshine: 6.8h).

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Average sunshine days in September
El Monte, CA

Average sunshine days in September - El Monte, CA
  • Average sunshine days in September: 25.5 days

The month with the most sunshine days is June (27.6 days).
The month with the least sunshine days is February (22.6 days).

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Average UV index in September
El Monte, CA

Average UV index in September - El Monte, 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
El Monte, CA

Average cloud cover in September - El Monte, CA
  • Average cloud cover in September: 7

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

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Average visibility in September
El Monte, CA

Average visibility in September - El Monte, 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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