September weather forecast and climate
Bloomington, CA

Weather in September

September, the first month of the autumn, in Bloomington, is also a hot month, with temperature in the range of an average high of 88.3°F (31.3°C) and an average low of 63.9°F (17.7°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still hot 88.3°F (31.3°C). In Bloomington, in September, the average low-temperature is 63.9°F (17.7°C).

Heat index

In September, the average heat index is evaluated at a tropical 88.9°F (31.6°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity 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 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, pregnancy, clothing), and activity. 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 Bloomington, the average relative humidity is 42%.

Rainfall

In Bloomington, it is raining for 2.4 days, with typically 0.12" (3mm) of accumulated precipitation. In Bloomington, California, during the entire year, the rain falls for 48.1 days and collects up to 6.89" (175mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Daylight

The average length of the day in Bloomington is 12.4h.

Sunshine

In September, the average sunshine is 10.7h.

UV index

The average daily maximum UV index in Bloomington is 6. A UV Index of 6 to 7 symbolizes 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. 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 Bloomington?

The average high-temperature, in September, in Bloomington, California, is 88.3°F (31.3°C), while the average low-temperature is 63.9°F (17.7°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that combines both air temperature and relative humidity, is calculated to 88.9°F (31.6°C).

What is the average humidity in September in Bloomington?

In September, the average relative humidity is 42%.

How many days does it rain in September in Bloomington?

In September, in Bloomington, the rain falls for 2.4 days. Throughout September, 0.12" (3mm) of precipitation is accumulated.

When it does not snow in Bloomington?

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

How many hours of daylight does Bloomington have in September?

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

How many hours of sunshine does Bloomington have in September?

The average sunshine in September in Bloomington is 10.7h.

What is the UV index intensity in September in Bloomington?

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

Average temperature in September
Bloomington, CA

Average temperature in September - Bloomington, CA
  • Average high temperature in September: 88.3°F

The warmest month (with the highest average high temperature) is August (92.1°F).
The month with the lowest average high temperature is December (60.8°F).

  • Average low temperature in September: 63.9°F

The month with the highest average low temperature is August (67.3°F).
The coldest months (with the lowest average low temperature) are February and December (44.2°F).

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Average pressure in September
Bloomington, CA

Average pressure in September - Bloomington, CA
  • Average pressure in September: 29.87"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.85").

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Average wind speed in September
Bloomington, CA

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

The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in September
Bloomington, CA

Average humidity in September - Bloomington, CA
  • Average humidity in September: 42%

Months with the highest relative humidity are February, March and May (52%).
The month with the lowest relative humidity is August (39%).

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Average rainfall in September
Bloomington, CA

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

The wettest month (with the highest rainfall) is February (1.57").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Bloomington, CA

Average rainfall days in September - Bloomington, CA
  • Average rainfall days in September: 2.4 days

The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.2 days).

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Average snowfall days in September
Bloomington, CA

Average snowfall days in September - Bloomington, 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
Bloomington, CA

Average daylight in September / Average sunshine in September - Bloomington, 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

Months with the most sunshine are June, July and August (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.9h).

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Average sunshine days in September
Bloomington, CA

Average sunshine days in September - Bloomington, CA
  • Average sunshine days in September: 25.9 days

The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (21.1 days).

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Average UV index in September
Bloomington, CA

Average UV index in September - Bloomington, 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
Bloomington, CA

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

Months with the most cloud cover are February, 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
Bloomington, CA

Average visibility in September - Bloomington, 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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