September weather forecast and climate
Bellflower, CA

Weather in September

September, the first month of the autumn, in Bellflower, is also a moderately hot month, with average temperature ranging between min 64.8°F (18.2°C) and max 81.1°F (27.3°C).

Temperature

In Bellflower, the average high-temperature is almost the same as in August - a still moderately hot 81.1°F (27.3°C). In September, in Bellflower, the average low-temperature is 64.8°F (18.2°C).

Heat index

In September, the average heat index is evaluated at 83.3°F (28.5°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 'real feel', 'feels like', 'apparent temperature', or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, differences in body mass, height, and shape, clothing, 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. 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

The average relative humidity in Bellflower is 60%.

Rainfall

In September, in Bellflower, the rain falls for 3.1 days. Throughout September, 0.2" (5mm) of precipitation is accumulated. In Bellflower, during the entire year, the rain falls for 53.4 days and collects up to 8.43" (214mm) of precipitation.

Daylight

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

Sunshine

In Bellflower, the average sunshine in September is 10.6h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Bellflower?

In Bellflower, California, in September, the average high-temperature is 81.1°F (27.3°C), and the average low-temperature is 64.8°F (18.2°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 83.3°F (28.5°C).

What is the average humidity in September in Bellflower?

The average relative humidity in September in Bellflower, California, is 60%.

How many days does it rain in September in Bellflower?

In Bellflower, in September, it is raining for 3.1 days, with typically 0.2" (5mm) of accumulated precipitation.

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

The average length of the day in September in Bellflower is 12.4h.

How many hours of sunshine does Bellflower have in September?

The average sunshine in September in Bellflower is 10.6h.

When is the highest UV index in Bellflower?

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

What is the UV index reading in September in Bellflower?

In September, the average daily maximum UV index in Bellflower is 6. A UV Index reading of 6 to 7 represents a high health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Bellflower, CA

Average temperature in September - Bellflower, CA
  • Average high temperature in September: 81.1°F

The warmest month (with the highest average high temperature) is August (82°F).
The month with the lowest average high temperature is December (64.2°F).

  • Average low temperature in September: 64.8°F

The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is February (51.3°F).

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Average pressure in September
Bellflower, CA

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

The month with the highest atmospheric pressure is January (30.1").
Months with the lowest atmospheric pressure are June and September (29.89").

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Average wind speed in September
Bellflower, CA

Average wind speed in September - Bellflower, CA
  • Average wind speed in September: 4.8mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are September and October (4.8mph).

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Average humidity in September
Bellflower, CA

Average humidity in September - Bellflower, CA
  • Average humidity in September: 60%

The month with the highest relative humidity is June (68%).
The month with the lowest relative humidity is November (53%).

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Average rainfall in September
Bellflower, CA

Average rainfall in September - Bellflower, CA
  • Average rainfall in September: 0.2"

The wettest month (with the highest rainfall) is February (1.73").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in September
Bellflower, CA

Average rainfall days in September - Bellflower, CA
  • Average rainfall days in September: 3.1 days

The month with the highest number of rainy days is March (8.2 days).
The month with the least rainy days is June (1.4 days).

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

Average daylight in September / Average sunshine in September - Bellflower, 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).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in September
Bellflower, CA

Average sunshine days in September - Bellflower, CA
  • Average sunshine days in September: 23.5 days

The month with the most sunshine days is August (25.9 days).
The month with the least sunshine days is February (19.8 days).

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Average UV index in September
Bellflower, CA

Average UV index in September - Bellflower, 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 February, November and December (UV index 4).

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Average cloud cover in September
Bellflower, CA

Average cloud cover in September - Bellflower, 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 6).

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Average visibility in September
Bellflower, CA

Average visibility in September - Bellflower, 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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