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Romeoville Weather in September
During September, Romeoville experiences high daytime temperatures of 25°C (77°F) and cooler nights around 13°C (55°F). Expect quite a bit of rainfall. Around 85 mm (3.3 in) is typical.
Rainfall in Romeoville in September
Typically, about 9 days will experience rainfall, with an average of 85 mm (3.3 in) for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Romeoville in September
Romeoville in September is worth a visit. The temperature is excellent, with 25°C (77°F) during the day and 13°C (55°F) at night. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights cool down to 13°C (55°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Romeoville in September
Expect a lot of sunshine this month, with about 226 hours of sun. These sunny conditions add to the overall experience.Our weather planner can help you find worldwide destinations with pleasant weather during this period. September typically offers the best weather for Romeoville.
Romeoville Temperature in September
Min Temperature
13°C (55°F)
Max Temperature
25°C (77°F)
Chance of Rain
30%
Precipitation
85 mm (3.3 in)
Rainy days
9 days
Humidity
71% *
Sunshine
226 hours *
Percentage Sunshine
60% *
* Data from: Chicago, the United States of America (40 KM, 25 Miles).
Romeoville Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Romeoville - and find the best time to visit.
Best Places 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. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Romeoville in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Romeoville in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
Romeoville 3-Day Forecast
More climate data for Romeoville
Temperature Rainfall Sunshine Humidity
See the full Romeoville climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
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