September weather forecastAlvin, IL
September
Weather in September
The first month of the autumn, September, is still a warm month in Alvin, Illinois, with temperature in the range of an average high of 75.6°F (24.2°C) and an average low of 57.6°F (14.2°C).Temperature
September's arrival shows an average high-temperature of a still moderately hot 75.6°F (24.2°C), hardly different from the previous month. Throughout September, an average nighttime temperature of 57.6°F (14.2°C) is experienced in Alvin.Humidity
In Alvin, the average relative humidity in September is 77%.Rainfall
In September, the rain falls for 12.1 days. Throughout September, 1.3" (33mm) of precipitation is accumulated. In Alvin, during the entire year, the rain falls for 146.3 days and collects up to 22.76" (578mm) of precipitation.Snowfall
In Alvin, Illinois, 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 September, sunrise is at 6:18 am and sunset at 7:21 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:33 pm CDT.
Sunshine
The average sunshine in September in Alvin is 8.7h.UV index
The average daily maximum UV index in September in Alvin is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: During September, 5 as the daily maximum UV index converts into the following advice:
Take necessary precautions - Suggestions to elude sunburn are provided. To guard against the harmful effects of the Sun, minimize exposure during midday. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Alvin, IL
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in September: 57.6°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
Alvin, 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 (29.93"Hg).
Average wind speed in September
Alvin, IL
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in September
Alvin, IL
- Average humidity in September: 77%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Alvin, IL
- Average rainfall in September: 1.3"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is February (1.18").
Average rainfall days in September
Alvin, IL
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is February (6.7 days).
Average snowfall in September
Alvin, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.32").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Alvin, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.8 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
Alvin, 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: 8h and 42min
The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Alvin, IL
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (9.5 days).
Average UV index in September
Alvin, IL
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Alvin, IL
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are June, August and September (Cloud cover 33).
Average visibility in September
Alvin, 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).
