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Grenville Weather Forecast
| REST OF TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
 |  | | | |  |  |  |  |  | | |
| Mostly Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy | Partly Cloudy | Chance of Showers | Chance of Showers | Showers | Chance of Showers | Chance of Showers |
| Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Hi: 69°FHi: 21°C Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C Lo: 51°FLo: 11°C | Lo: 50°FLo: 10°C | Hi: 61°FHi: 16°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 49°FLo: 9°C |
| POP: 40% | POP: 60% | POP: 80% | POP: 50% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 922 AM CDT Wed Sep 09 2026 
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Issued: 619 AM CDT Wed Sep 9 2026
Key Messages
- Temperatures near to below normal, in the 60s and 70s, are forecast today, and slightly below normal this weekend. Only on Thursday and Friday are temperatures expected to warm back up to above normal in the 80s to low 90s.
- Low relative humidity values Thursday afternoon in areas west of the Missouri River, between 15-25%, is creating elevated fire weather concerns. Slightly weaker wind gusts, below 25 mph, help to lower the fire weather concern and keep the Grassland Fire Danger val...