National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Lafayette, Purdue University Airport (KLAF)

Lat: 40.41°NLon: 86.95°WElev: 604ft.

Overcast

73°F

23°C

Humidity 90%
Wind Speed NE 9 mph
Barometer 30.22 in (1022.9 mb)
Dewpoint 70°F (21°C)
Visibility 9.00 mi
Last update 18 Sep 12:54 pm EDT
Extended Forecast for

Collegeville IN

  • This Afternoon

    This Afternoon: Cloudy early, then becoming mostly sunny, with a high near 76. East northeast wind around 10 mph.

    High: 76 °F

    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 5am. Increasing clouds, with a low around 59. East southeast wind 5 to 10 mph.

    Low: 59 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms, mainly before 1pm, then showers likely and possibly a thunderstorm after 5pm. High near 78. South wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 78 °F

    T-storms then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 63. South southeast wind around 5 mph becoming calm. Chance of precipitation is 90%.

    Low: 63 °F

    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 74. Light north northeast wind becoming northeast 5 to 10 mph in the morning. Winds could gust as high as 15 mph. Chance of precipitation is 80%.

    High: 74 °F

    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 54. Chance of precipitation is 60%.

    Low: 54 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.

    High: 66 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A chance of showers. Mostly cloudy, with a low around 50.

    Low: 50 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 65.

    High: 65 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Cloudy early, then becoming mostly sunny, with a high near 76. East northeast wind around 10 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 5am. Increasing clouds, with a low around 59. East southeast wind 5 to 10 mph.
Saturday
Showers and thunderstorms, mainly before 1pm, then showers likely and possibly a thunderstorm after 5pm. High near 78. South wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers and possibly a thunderstorm. Low around 63. South southeast wind around 5 mph becoming calm. Chance of precipitation is 90%.
Sunday
Showers and possibly a thunderstorm. High near 74. Light north northeast wind becoming northeast 5 to 10 mph in the morning. Winds could gust as high as 15 mph. Chance of precipitation is 80%.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 54. Chance of precipitation is 60%.
Monday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 50.
Tuesday
Mostly cloudy, with a high near 65.
Tuesday Night
Mostly cloudy, with a low around 49.
Wednesday
Partly sunny, with a high near 67.
Wednesday Night
Mostly cloudy, with a low around 49.
Thursday
Partly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Collegeville IN
 40.92°N 87.16°W
Last Update:
11:36 am CDT Sep 18, 2026
Forecast Valid:
12pm CDT Sep 18, 2026-6pm CDT Sep 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation