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

September weather forecast and climate
Peoria, IL

A night view of lit street lights and tall buildings in the city of Peoria, Illinois, as well as the night sky reflected in the waterfront
A night view of lit street lights and tall buildings in the city of Peoria, Illinois, as well as the night sky reflected in the waterfront
September, the first month of the autumn, in Peoria, is still a warm month, with average temperature ranging between min 55.2°F (12.9°C) and max 77°F (25°C).

Temperature

In Peoria, the average high-temperature slightly decreases, from 83.8°F (28.8°C) in August, to a still moderately hot 77°F (25°C). In September, the average low-temperature is 55.2°F (12.9°C).

Humidity

The average relative humidity in Peoria is 72.7%.

Rainfall

In Peoria, during September, the rain falls for 8.1 days and regularly aggregates up to 3.1" (80mm) of precipitation. Throughout the year, there are 116.5 rainfall days, and 36.5" (926.9mm) of precipitation is accumulated.

Snowfall

Throughout the year, in Peoria, Illinois, 24.6" (624.8mm) of snow is accumulated.

Daylight

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

Sunshine

In Peoria, the average sunshine in September is 7.8h.

What is the temperature in September in Peoria?

In Peoria, Illinois, in September, the average high-temperature is 77°F (25°C), and the average low-temperature is 55.2°F (12.9°C).

What is the average humidity in September in Peoria?

In Peoria, Illinois, the average relative humidity in September is 72.7%.

How many days does it rain in September in Peoria?

In Peoria, Illinois, in September, during 8.1 rainfall days, 3.1" (80mm) of precipitation is typically accumulated.

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

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

How many hours of sunshine does Peoria have in September?

In September, the average sunshine in Peoria, Illinois, is 7.8h.
Average temperature in September - Peoria, IL
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (32.8°F).

  • Average low temperature in September: 55.2°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (17°F).

Average humidity in September - Peoria, IL
  • Average humidity in September: 72.7%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is April (64.7%).

Average rainfall in September - Peoria, IL
  • Average rainfall in September: 3.2"

The wettest month (with the highest rainfall) is May (4.3").
Driest months (with the lowest rainfall) are January and February (1.8").

Average rainfall days in September - Peoria, IL
  • Average rainfall days in September: 8.1 days

The month with the highest number of rainy days is May (11.8 days).
The month with the lowest number of rainy days is September (8.1 days).

Average snowfall in September - Peoria, IL
  • Average snowfall in September: 0"

The month with the highest snowfall is December (7.1").
Months with the lowest snowfall are May, June, July, August, September and October (0").

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

The month with the highest number of snowfall days is January (5.8 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 - Peoria, IL
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 7.8h

The month with most sunshine is June (Average sunshine: 10.2h).
The month with least sunshine is December (Average sunshine: 3.8h).