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Costa High School Weather Forecast
| REST OF TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  |  | | |  |  |  | | | |  |
| Partly Cloudy | Sunny | Clear | Mostly Sunny | Partly Cloudy | Mostly Cloudy | Showers Likely | Showers | Chance of Showers | Partly Sunny | Partly Cloudy | Partly Cloudy |
| Lo: 50°FLo: 10°C | Hi: 75°FHi: 24°C | Lo: 50°FLo: 10°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Hi: 69°FHi: 21°C Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C Lo: 55°FLo: 13°C |
| POP: 60% | POP: 80% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Mon Sep 28 2026 
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Issued: 246 AM CDT Mon Sep 28 2026
Key Messages
- Quiet and Seasonable Early Week: Quiet, mild conditions continue through tonight with highs in the mid-70s and lows near 50. Warm air pushes afternoon temperatures into the 80s for Tuesday and Wednesday.
- Widespread Rain Thursday into Friday: A slow-moving cold front will bring widespread rainfall to central Illinois late Wednesday night through Friday.
- Rainfall Totals and Heavy Rain Potential: Areas north of Interstate 70 have a medium (40-60%) chance of receiving over 1 inch of rain...