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Geist Reservoir, IN Weather Forecast
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Geist Reservoir Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  |  |  |  |  | |  | | | | |
| Chance of T-Storm | Thunderstorms | Partly Cloudy | Clearing | Mostly Sunny | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy | Chance of T-Storm | Partly Cloudy |
| Hi: 85°FHi: 29°C | Lo: 70°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C | Hi: 79°FHi: 26°C Lo: 61°FLo: 16°C |
| POP: 70% | POP: 40% | POP: 20% | POP: 50% | POP: 30% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 537 AM EDT Sun Aug 16 2026 
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Geist Reservoir Forecast Discussion
Issued: 303 AM EDT Sun Aug 16 2026
Key Messages
- Storm threat continues through tonight, with locally damaging winds, heavy rain, and rapid onset flash flooding remaining possible
- Heat index values in excess of 100 possible today in southern portions of central Indiana
- Dry and milder weather early in the work week
- Additional storms possible Wednesday
Discussion
(Today through Saturday)... Issued at 303 AM EDT Sun Aug 16 2026
THROUGH TONIGHT...
One or more upper level waves, at least partially convectively-...