Rosemont Weather in September

Rosemont in September sees high temperatures, with highs around 24°C (75°F) and overnight lows of 14°C (57°F). Rainfall is fairly high at around 96 mm (3.8 in) on average, so pack waterproofs just in case.

Rainfall in Rosemont in September

Typically, about 9 days will experience rainfall, with an average of 96 mm (3.8 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Rosemont in September

Rosemont has perfect weather in September, with days reaching 24°C (75°F) and nights cooling to 14°C (57°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights drop to around 14°C (57°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Rosemont in September

The city usually sees around 226 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Wind Speed in Rosemont in September

In September, average wind speeds reach 4 m/s (8 knots), leading to light to moderate breezes. Conditions vary from day to day, with both calm and windier periods.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Rosemont's climate page.

Rosemont Temperature in September

Min Temperature 14°C (57°F)  

Max Temperature 24°C (75°F)  

Chance of Rain 30%  

Precipitation 96 mm (3.8 in)  

Rainy days 9 days  

Humidity 71% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 226 hours *  

Percentage Sunshine 60% *  

* Data from: Chicago, the United States of America (2 KM, 1 Miles).

What to Wear in Rosemont in September

For Rosemont in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Rosemont in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

9/10

Walking

9/10

Barbeque

8/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Rosemont's climate page.

More climate data for Rosemont

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Rosemont climate overview or explore weather in the United States of America.