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Brookhaven, IL Weather Forecast
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Brookhaven Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Chance of Showers | Mostly Cloudy | Chance of Showers |
| Hi: 91°FHi: 33°C | Lo: 71°FLo: 22°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Lo: 71°FLo: 22°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C |
| POP: 20% | POP: 30% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 605 AM CDT Fri Sep 04 2026 
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Issued: 619 AM CDT Fri Sep 4 2026
Key Messages
- Today will be another unseasonably hot and humid day with peak afternoon heat indices of 100 to 110 degrees.
- Gradually turning cooler and less humid this weekend, though remaining seasonably warm.
- Moderate to high swim risk expected late Saturday into early Sunday during the final weekend of beach season.
Discussion
... Issued at 301 AM CDT Fri Sep 4 2026
An unusually strong late season mid-upper level ridge of high pressure continues to dominate the weather across much of the central a...