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Grainger County, TN Weather Forecast
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Grainger County Weather Forecast
| REST OF TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  |  |  | | | | |  | | |
| Mostly Clear | Sunny | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Chance of T-Storm | Partly Cloudy | Chance of Showers | Partly Cloudy | Sunny |
| Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C | Lo: 70°FLo: 21°C | Hi: 90°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C |
| POP: 40% | POP: 30% | POP: 50% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 106 AM EDT Fri Sep 04 2026 
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Issued: 742 PM EDT Thu Sep 3 2026
Key Messages
Updated at 739 PM EDT Thu Sep 3 2026- Very hot conditions are expected through the rest of the week with highs reaching well into the 90s and heat index values approaching or exceeding 100 for most places outside the higher elevations. Take frequent breaks and drink plenty of water when outdoors this week!
- Temperatures will gradually moderate some through the weekend with a return of isolated to scattered showers and storms.
- A few storms Friday afternoon/evening mainly north and then ...