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Simpson Lakes Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
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| Chance of T-Storm | Chance of Showers | Partly Cloudy | Partly Sunny | Chance of Showers | Mostly Cloudy | Partly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 45°FLo: 7°C | Hi: 71°FHi: 22°C | Lo: 50°FLo: 10°C | Hi: 71°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C |
| POP: 50% | POP: 40% | POP: 30% | POP: 60% | POP: 70% | POP: 50% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 613 PM EDT Mon Sep 14 2026 
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Issued: 218 PM EDT Mon Sep 14 2026
Key Messages
- Becoming windy and wet tonight into Tuesday
- Seasonable temperatures with a few shower chances mid to late week, heaviest rain focused south
.DISCUSSION... Issued at 216 PM EDT Mon Sep 14 2026
Fast moving upper flow across the northern tier of the CONUS with Pacific NW shortwave energy ejecting into the upper Midwest, as a transitory upper ridge amplifies over the Great Lakes. This will result in northward push of warm, moist air into our area tonight into Tuesday. The shortwave will s...