September weather forecast
Astoria, IL

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Weather in September

September, the first month of the autumn in Astoria, is still a warm month, with an average temperature fluctuating between 77.5°F (25.3°C) and 58.1°F (14.5°C).

Temperature

September signals a slight drop in average high-temperature, sliding from August's moderately hot 82.9°F (28.3°C) to a still warm 77.5°F (25.3°C). Astoria in September anticipates an average nighttime temperature of 58.1°F (14.5°C).

Humidity

The average relative humidity in September in Astoria is 75%.

Rainfall

In September, the rain falls for 11.3 days. Throughout September, 2.83" (72mm) of precipitation is accumulated. In Astoria, during the entire year, the rain falls for 146.5 days and collects up to 29.41" (747mm) of precipitation.

Snowfall

May through September are months without snowfall in Astoria.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of September in Astoria, sunrise is at 6:29 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm CDT.

Sunshine

In Astoria, the average sunshine in September is 9.5h.

UV index

In September, the average daily maximum UV index in Astoria, Illinois, is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Experience reduced UV exposure by about half when donning a wide-brim hat.

Frequently asked questions

What are September temperatures in Astoria?

In Astoria, in September, the average high-temperature is 77.5°F (25.3°C), and the average low-temperature is 58.1°F (14.5°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 91.4°F (33°C).

What is the average humidity in September in Astoria?

The average relative humidity in September in Astoria, Illinois, is 75%.

How many days does it rain in September in Astoria?

In Astoria, during September, the rain falls for 11.3 days and regularly aggregates up to 2.83" (72mm) of precipitation.

When it does not snow in Astoria?

In Astoria, snow does not fall in May through September.

Does it snow in Astoria in September?

In Astoria, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Astoria have in September?

The average day length in September in Astoria is 12h and 26min.

What time are sunrise and sunset in September in Astoria?

On the first day of September, sunrise is at 6:29 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm CDT.

How long on average sun shines in September in Astoria?

In Astoria, Illinois, the average sunshine duration in September is 9.5h.

How high is the UV index in September in Astoria?

The average daily maximum UV index in September in Astoria is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe 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
Astoria, IL

Average temperature in September - Astoria, IL
  • Average high temperature in September: 77.5°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (32.4°F).

  • Average low temperature in September: 58.1°F

The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).

Average pressure in September
Astoria, IL

Average pressure in September - Astoria, IL
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in September
Astoria, IL

Average wind speed in September - Astoria, IL
  • Average wind speed in September: 7.2mph

The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).

Average humidity in September
Astoria, IL

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

The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Astoria, IL

Average rainfall in September - Astoria, IL
  • Average rainfall in September: 2.83"

The wettest month (with the highest rainfall) is May (4.02").
The driest month (with the least rainfall) is December (1.46").

Average rainfall days in September
Astoria, IL

Average rainfall days in September - Astoria, IL
  • Average rainfall days in September: 11.3 days

The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is January (6 days).

Average snowfall in September
Astoria, IL

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

The month with the highest snowfall is January (4.09").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Astoria, IL

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

The month with the highest number of snowfall days is January (8.3 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
Astoria, IL

Average daylight in September / Average sunshine in September - Astoria, IL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in September: 9h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

Average sunshine days in September
Astoria, IL

Average sunshine days in September - Astoria, IL
  • Average sunshine days in September: 16 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (9.6 days).

Average UV index in September
Astoria, IL

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

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

Average cloud cover in September
Astoria, IL

Average cloud cover in September - Astoria, IL
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are July, August and September (Cloud cover 29).

Average visibility in September
Astoria, IL

Average visibility in September - Astoria, IL
  • Average visibility in September: 6mi

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

Astoria, Illinois, USA

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