Harper, OR Weather Forecast
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Harper Weather Forecast
| REST OF TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | MONDAY |
| Sunny | Partly Cloudy | Sunny | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Patchy Fog | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy |
| Hi: 74°FHi: 23°C | Lo: 48°FLo: 9°C | Hi: 77°FHi: 25°C | Lo: 49°FLo: 9°C | Hi: 74°FHi: 23°C | Lo: 47°FLo: 8°C | Hi: 76°FHi: 24°C | Hi: 77°FHi: 25°C Lo: 48°FLo: 9°C | Hi: 77°FHi: 25°C Lo: 48°FLo: 9°C | Hi: 81°FHi: 27°C Lo: 50°FLo: 10°C | Hi: 81°FHi: 27°C Lo: 50°FLo: 10°C |
| POP: 30% | POP: 30% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 753 AM MDT Tue Sep 15 2026 

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Issued: 1123 AM MDT Tue Sep 15 2026
Key Messages
- Slight warming and drying trend Tuesday and Wednesday, with light winds.
- Cold temperatures tonight will bring patchy fog and frost to the mountain valleys.
- A low pressure system will bring light precipitation and isolated afternoon thunderstorms across the area Thursday and Friday.
Aviation
/18Z Tuesday through Wednesday/... Issued 1120 AM MDT TUE SEP 15 2026
VFR. Increasing high clouds this afternoon, mainly north and west of KTWF/KJER. Surface winds: E-SE 5-10 kt, becoming NW 7-12 kt ...
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