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Lake Forest Weather Forecast
| TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
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| Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of Showers | Chance of Showers | Showers Likely |
| Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C |
| POP: 20% | POP: 80% | POP: 60% | POP: 50% | POP: 50% | POP: 40% | POP: 50% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 830 PM EDT Sat Aug 22 2026 
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Lake Forest Forecast Discussion
Issued: 736 PM EDT Sat Aug 22 2026
Key Messages
1) Likelihood of showers and thunderstorms increases late tonight into Sunday. A few storms may become severe on Sunday.
2) Isolated to scattered showers and thunderstorms are expected Monday and Tuesday, especially near and north of I-90. Temperatures will be below normal.
3) Chances of showers and thunderstorms return late next week along with warmer temperatures.
Discussion
... KEY MESSAGE 1...
An upper level trough over our region will deepen through the rest of the weekend, as a clos...