September weather forecastLittleton, IL
September
Weather in September
The first month of the autumn, September, is still a warm month in Littleton, Illinois, with an average temperature fluctuating between 58.1°F (14.5°C) and 77.5°F (25.3°C).Temperature
With the arrival of September, Littleton notices a mild change in the average high-temperature, sliding from August's 82.9°F (28.3°C) to a still moderately hot 77.5°F (25.3°C). Littleton observes an average nighttime low-temperature of 58.1°F (14.5°C) during the month of September.Humidity
In Littleton, the average relative humidity in September is 75%.Rainfall
In Littleton, in September, it is raining for 11.3 days, with typically 2.83" (72mm) of accumulated precipitation. In Littleton, during the entire year, the rain falls for 146.5 days and collects up to 29.41" (747mm) of precipitation.Snowfall
In Littleton, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:30 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm CDT.
Sunshine
In September, the average sunshine is 9.5h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Take precautions - Protection against sun damage is advised. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Littleton, 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
Littleton, 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
Littleton, 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
Littleton, 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
Littleton, 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
Littleton, 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
Littleton, 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
Littleton, 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
Littleton, IL
- Average daylight in September: 12h and 24min
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 30min
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
Littleton, 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
Littleton, 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
Littleton, 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
Littleton, 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).
