Springfield
Illinois, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Springfield, IL

The Abraham Lincoln House in Springfield, Illinois, on a partially sunny autumn day
The Abraham Lincoln House in Springfield, Illinois, on a partially sunny autumn day
The first month of the autumn, September, is still a warm month in Springfield, Illinois, with average temperature fluctuating between 58.5°F (14.7°C) and 77.4°F (25.2°C).

Temperature

In Springfield, the average high-temperature in September is almost the same as in August - a still warm 77.4°F (25.2°C). In September, in Springfield, the average low-temperature is 58.5°F (14.7°C).

Humidity

In Springfield, the average relative humidity in September is 75%.

Rainfall

In Springfield, it is raining for 12.3 days, with typically 2.28" (58mm) of accumulated precipitation. Throughout the year, in Springfield, there are 140.2 rainfall days, and 23.27" (591mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Springfield.

Daylight

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

Sunshine

In September, the average sunshine is 9.3h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Springfield?

In Springfield, in September, the average high-temperature is 77.4°F (25.2°C), and the average low-temperature is 58.5°F (14.7°C).

What is the average humidity in September in Springfield?

In Springfield, Illinois, the average relative humidity in September is 75%.

How much does it rain in Springfield in September?

In Springfield, Illinois, in September, during 12.3 rainfall days, 2.28" (58mm) of precipitation is typically accumulated.

When it does not snow in Springfield?

May through October are months without snowfall.

How many hours of daylight does Springfield have in September?

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

How many hours of sunshine does Springfield have in September?

In September, the average sunshine in Springfield is 9.3h.

How high is the UV index in September in Springfield?

The average daily maximum UV index in September in Springfield, Illinois, is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.
Average temperature in September - Springfield, IL
  • Average high temperature in September: 25.2°C

The warmest month (with the highest average high temperature) is July (28.2°C).
The month with the lowest average high temperature is January (0.8°C).

  • Average low temperature in September: 14.7°C

The month with the highest average low temperature is July (18.9°C).
The coldest month (with the lowest average low temperature) is January (-6.2°C).

Average humidity in September - Springfield, IL
  • Average humidity in September: 75%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).

Average rainfall in September - Springfield, IL
  • Average rainfall in September: 58mm

The wettest month (with the highest rainfall) is June (69mm).
The driest month (with the lowest rainfall) is December (30mm).

Average rainfall days in September - Springfield, IL
  • Average rainfall days in September: 12.3 days

The month with the highest number of rainy days is May (17.1 days).
The month with the lowest number of rainy days is February (5.8 days).

Average snowfall in September - Springfield, IL
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (57mm).
Months with the lowest snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in September - Springfield, IL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.5 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Springfield, IL
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 9.3h

The month with most sunshine is June (Average sunshine: 10.4h).
The month with least sunshine is January (Average sunshine: 4.2h).

Average UV index in September - Springfield, IL
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).