Weather World
Lake Arrowhead, IL Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Lake Arrowhead Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
 |  |  |  | | | | |  | | |  |
| Chance of T-Storm | Mostly Cloudy | Mostly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Showers Likely | Mostly Cloudy | Mostly Cloudy | Partly Cloudy |
| Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 59°FLo: 15°C |
| POP: 90% | POP: 50% | POP: 70% | POP: 80% | POP: 50% | POP: 50% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 601 AM CDT Thu Sep 17 2026 
Lake Arrowhead Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Lake Arrowhead Weather Map
Lake Arrowhead Quick Facts
Lake Arrowhead Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 652 AM CDT Thu Sep 17 2026
Key Messages
- Showers and storms will move across the region this morning. Localized flooding may occur in typical prone locations.
- A brief break in the pattern is expected tomorrow afternoon through Friday before another period of wet weather materializes this weekend.
Discussion
... Issued at 310 AM CDT Thu Sep 17 2026
Isentropic upglide associated with an intensifying southwesterly low-level jet overrunning a quasi-stationary surface boundary over central Illinois continues to facilitate blossomin...