Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The average high-temperature during September registers at a still moderately hot 76.5°F (24.7°C), maintaining a close resemblance to the previous month. In the month of September, the temperature in Delavan generally rests at an average low of 57.9°F (14.4°C).Humidity
The average relative humidity in September in Delavan, Illinois, is 76%.Rainfall
In September, the rain falls for 10.3 days. Throughout September, 1.57" (40mm) of precipitation is accumulated. Throughout the year, in Delavan, Illinois, there are 131.4 rainfall days, and 20.08" (510mm) of precipitation is accumulated.Snowfall
In Delavan, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:41 pm CDT.
Sunshine
In Delavan, the average sunshine in September is 9.1h.UV index
In Delavan, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The average daily UV index of 5 in September transforms into the following instructions:
Prioritize safety - Suggestions to prevent sun damage are offered. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Frequently asked questions
What is the average September temperature in Delavan?
What is the average humidity in September in Delavan?
How much does it rain in Delavan in September?
When it does not snow in Delavan?
How many hours of daylight does Delavan have in September?
When are sunrise and sunset in September in Delavan?
How long on average sun shines in September in Delavan?
How high is the UV index in September in Delavan?
Average temperature in September
Delavan, IL
- Average high temperature in September: 76.5°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in September: 57.9°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
Delavan, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Delavan, IL
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in September
Delavan, IL
- Average humidity in September: 76%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Delavan, IL
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is February (1.02").
Average rainfall days in September
Delavan, IL
- Average rainfall days in September: 10.3 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in September
Delavan, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Delavan, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.4 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
Delavan, 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 18min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Delavan, IL
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in September
Delavan, 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
Delavan, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in September
Delavan, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Delavan, Illinois, USA
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