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McHenry Weather Forecast
| REST OF TODAY | TONIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  | |  | | | |  |  | | | |
| Mostly Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Chance of Showers | Chance of T-Storm | Chance of Showers | Mostly Sunny | Mostly Clear |
| Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C |
| POP: 40% | POP: 60% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1056 AM EDT Sun Sep 06 2026 
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Issued: 1011 AM EDT Sun Sep 6 2026
Key Messages
- 1) Drier conditions with seasonable temperatures and lower humidity today into early parts of the week.
- 2) Shower and thunderstorm chances return by mid week.
Discussion
... KEY MESSAGE 1...Drier conditions with seasonable temperatures and lower humidity Sunday into early next week.
Broad high pressure over the Great Lakes will track over the Mid-Atlantic through Monday. This will bring a change in airmass with notably lower dew points. Highs in the low 80s for most today and Monday. Ov...