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Lake Harriet Park, IL Weather Forecast
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Lake Harriet Park Weather Forecast
| REST OF TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  |  |  | |  | | | | | | |
| Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Mostly Sunny | Partly Cloudy | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Lo: 75°FLo: 24°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C |
| POP: 60% | POP: 40% | POP: 80% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1016 PM CDT Sat Aug 15 2026 
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Lake Harriet Park Forecast Discussion
Issued: 637 PM CDT Sat Aug 15 2026
Key Messages
- Another round of heavy rain producing showers and thunderstorms late this evening into Sunday morning.
- A brief break in the stormy pattern is expected Monday into early Tuesday before storm chances return ahead of the next cold front late Tuesday into Tuesday night.
Discussion
... Issued at 236 PM CDT Sat Aug 15 2026
The remnant MCV responsible for this morning`s heavy rain across central Illinois is shifting into northern Indiana this afternoon. In its wak...