Alton weather in September (Illinois, United States of America)
What kind of temperatures can you expect in Alton during September? Wondering about the weather this month? Our guide has all the details you need.
Temperatures
The weather in Alton during September is usually perfect, offering high temperatures and moderate rainfall. Expect temperatures to climb to 27°C during the day, with nighttime readings dropping to 15°C.
Precipitation
Alton in September usually receives moderate rainfall, averaging around 92 mm for the month. According to historical climate patterns, there are usually around 9 days days of rain.Average sunshine
There are approximately 235 hours of sunshine this month, meaning plenty of sunny days and a vibrant atmosphere.So this is a great month to visit if you prefer dry days with pleasant temperatures. September and October typically offer the most optimal weather. In contrast, January, February and December tend to have less optimal conditions.
For an in-depth look at the yearly conditions, visit our specialized Alton climate page with graphs.
Alton, monthly averages in September
Min Temperature
15°C
Max Temperature
27°C
Chance of Rain
29%
Precipitation
92 mm
Rainy days
9 days
Humidity
71% *
Sunshine
235 hours *
Percentage Sunshine
63% *
Where to go in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month.
perfect weather
pleasant
tolerable
unpleasant
poor
So, what should you wear in this month?
It's going to be warm! Consider airy clothing, t-shirts, and other summer clothes. Shorts for men made of cotton or linen are good options for staying cool. However, there's a good chance of rain, so bring a raincoat just in case.What To Do
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Interested in more climate information?
This site provides you with all the information you need about the climate in Alton.
Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.
