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Longtown Weather Forecast
| THIS AFTERNOON | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
 |  | |  | |  |  | |  |  |  | |
| Sunny | Clear | Sunny | Partly Cloudy | Sunny | Chance of T-Storm | Chance of Showers | Partly Cloudy | Partly Cloudy | Chance of Showers | Chance of Showers | Mostly Clear |
| Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 70°FLo: 21°C | Hi: 81°FHi: 27°C | Hi: 89°FHi: 32°C Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C Lo: 61°FLo: 16°C | Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C | Hi: 90°FHi: 32°C Lo: 69°FLo: 21°C |
| POP: 70% | POP: 80% | POP: 30% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1212 PM CDT Mon Sep 07 2026 
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Issued: 100 PM CDT Mon Sep 7 2026
Key Messages
- Heat returns Tuesday into Wednesday. Heat index readings reach 95-100 on Tuesday and 100-108 on Wednesday. Heat headlines may be needed on Wednesday. Temperatures then fall back closer to normal late week.
- Widespread showers and storms (60-90% chance of rain) are expected Wednesday night into Thursday as a cold front passes through the region. Somewhat unsettled conditions may continue Friday into Saturday with lingering rain chances (20-40%).
- There is a good chance (50-70%) of high ...