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Arches National Park Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
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| Sunny | Partly Cloudy | Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Sunny | Partly Cloudy |
| Hi: 105°FHi: 41°C | Lo: 71°FLo: 22°C | Hi: 104°FHi: 40°C | Lo: 71°FLo: 22°C | Hi: 100°FHi: 38°C | Lo: 65°FLo: 18°C | Hi: 98°FHi: 37°C | Lo: 65°FLo: 18°C | Hi: 98°FHi: 37°C | Lo: 65°FLo: 18°C | Hi: 98°FHi: 37°C | Lo: 65°FLo: 18°C |
| POP: 10% | POP: 20% | POP: 30% | POP: 10% | POP: 20% | POP: 10% |
POP = Probability of Precipitation.
Weather Outlook Updated: 700 AM MDT Thu Aug 20 2026 
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Arches National Park Forecast Discussion
Issued: 702 AM MDT Thu Aug 20 2026
Key Messages
- Isolated showers and thunderstorms expected over the high terrain Thursday. Main concerns will be gusty outflow winds and lightning.
- Triple-digit temperatures on Thursday and Friday in valleys.
- Precipitation potential increases Friday and into the weekend. Flash flooding will be possible, especially Saturday.
Discussion
... Issued at 931 PM MDT Wed Aug 19 2026
A slight lull in the active pattern is expected Thursday as the southwestern CONUS high drifts nor...