Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
Collinsville Weather in September
September in Collinsville averages 27°C (81°F) during the day and 15°C (59°F) at night. Quite a bit of rainfall is typical this month, with around 96 mm (3.8 in) on average. An umbrella is a good idea.
Rainfall in Collinsville in September
The climate data from previous years indicates about 9 days of rain, averaging 96 mm (3.8 in) for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Collinsville in September
Weather in Collinsville is at its excellent in September. Highs reach 27°C (81°F), while nights settle around 15°C (59°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 15°C (59°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Collinsville in September
With approximately 235 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Collinsville.
Collinsville Temperature in September
Min Temperature
15°C (59°F)
Max Temperature
27°C (81°F)
Chance of Rain
30%
Precipitation
96 mm (3.8 in)
Rainy days
9 days
Humidity
71% *
Sunshine
235 hours *
Percentage Sunshine
63% *
* Data from: St. Louis, the United States of America (19 KM, 11 Miles).
Collinsville Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Collinsville - 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 Collinsville in September
Warm but pleasant conditions in Collinsville in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Collinsville in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling7/10 -
Walking7/10 -
Camping8/10 -
Outdoor sports7/10
Collinsville 3-Day Forecast
More climate data for Collinsville
Temperature Rainfall Sunshine Humidity
See the full Collinsville 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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Yosemite National Park is definitely worth a visit
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