September weather forecast
Bloomington, IN

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Weather in September

September in Bloomington brings about untold transformations in its climate, signaling the commencement of Fall. A fall in temperature from August’s high of 82.9°F (28.3°C) introduces a fresh crispness to the air. Nature starts painting the city's foliage in hues of red, orange, and yellow. The count of daylight hours starts dwindling, making way for longer and cooler nights. As the transition month, September treats residents to a mix of extended, warm days and the first hints of winter evenings.

Temperature

The average high-temperature shows a slight dip in September, from August's 82.9°F (28.3°C) to a still warm 77.2°F (25.1°C). Bloomington, during the nights of September, experiences an average temperature drop to a mild 58.1°F (14.5°C).

Humidity

In Bloomington, Indiana, the average relative humidity in September is 77%.

Rainfall

September and October are months with the least rain when the rain falls for 12.4 days and typically aggregates up to 1.65" (42mm) of rain.

Snowfall

May through October are months without snowfall.

Daylight

In Bloomington, the average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 7:15 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 7:29 pm EDT.

Sunshine

In September, the average sunshine is 8.4h.

UV index

In Bloomington, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures in Bloomington?

Bloomington in September has an average high-temperature of 77.2°F (25.1°C) and an average low-temperature of 58.1°F (14.5°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 91.4°F (33°C).

What is the average humidity in September in Bloomington?

In Bloomington, Indiana, the average relative humidity in September is 77%.

What is the driest month in Bloomington?

September and October are months with the least rain when the rain falls for 12.4 days and typically aggregates up to 1.65" (42mm) of rain.

How many days does it rain in September in Bloomington?

In Bloomington, in September, it is raining for 12.4 days, with typically 1.65" (42mm) of accumulated precipitation.

When it does not snow in Bloomington?

May through October are months without snowfall in Bloomington, Indiana.

How many hours of daylight does Bloomington have in September?

In September, the average day length is 12h and 26min.

When are sunrise and sunset in September in Bloomington?

In September, on the first day of the month, sunrise is at 7:15 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 7:29 pm EDT.

How many hours of sunshine does Bloomington have in September?

The average sunshine duration in September in Bloomington, Indiana, is 8.4h.

How high is the UV index in September in Bloomington?

The average daily maximum UV index in September in Bloomington is 4. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Bloomington, IN

Average temperature in September - Bloomington, IN
  • Average high temperature in September: 77.2°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (35.6°F).

  • Average low temperature in September: 58.1°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

Average pressure in September
Bloomington, IN

Average pressure in September - Bloomington, IN
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
Bloomington, IN

Average wind speed in September - Bloomington, IN
  • Average wind speed in September: 5.8mph

The windiest month (with the highest average wind speed) is February (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).

Average humidity in September
Bloomington, IN

Average humidity in September - Bloomington, IN
  • Average humidity in September: 77%

The months with the highest relative humidity are May and December (82%).
The month with the lowest relative humidity is October (75%).

Average rainfall in September
Bloomington, IN

Average rainfall in September - Bloomington, IN
  • Average rainfall in September: 1.65"

The wettest month (with the highest rainfall) is April (3.11").
The driest months (with the least rainfall) are September and October (1.65").

Average rainfall days in September
Bloomington, IN

Average rainfall days in September - Bloomington, IN
  • Average rainfall days in September: 12.4 days

The month with the highest number of rainy days is May (19.2 days).
The month with the least rainy days is January (7.9 days).

Average snowfall in September
Bloomington, IN

Average snowfall in September - Bloomington, IN
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Bloomington, IN

Average snowfall days in September - Bloomington, IN
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Bloomington, IN
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).

Average sunshine days in September
Bloomington, IN

Average sunshine days in September - Bloomington, IN
  • Average sunshine days in September: 15.4 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (9.2 days).

Average UV index in September
Bloomington, IN

Average UV index in September - Bloomington, IN
  • Average UV index in September: 4

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, October and December (UV index 2).

Average cloud cover in September
Bloomington, IN

Average cloud cover in September - Bloomington, IN
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in September
Bloomington, IN

Average visibility in September - Bloomington, IN
  • Average visibility in September: 5mi

The months with the highest visibility are January, February, March, April, June, October, November and December (6mi).
The months with the lowest visibility are May, July, August and September (5mi).

Bloomington, Indiana, USA

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