Index, WA Weather Forecast
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| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
| Chance of Showers | Patchy Fog | Patchy Fog | Clear | Sunny | Clear | Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear |
| Hi: 65°FHi: 18°C | Lo: 46°FLo: 8°C | Hi: 75°FHi: 24°C | Lo: 50°FLo: 10°C | Hi: 75°FHi: 24°C | Lo: 50°FLo: 10°C | Hi: 75°FHi: 24°C | Lo: 53°FLo: 12°C | Hi: 73°FHi: 23°C | Lo: 53°FLo: 12°C | Hi: 73°FHi: 23°C | Lo: 51°FLo: 11°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 236 AM PDT Tue Sep 15 2026 

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Issued: 829 AM PDT Tue Sep 15 2026
Aviation
... Westerly flow aloft will turn northerly tonight as an upper trough drops southward across the Pacific Northwest. A mix of MVFR and VFR ceilings will continue through roughly 20Z. Ceilings will improve this afternoon with clearing tonight and VFR expected areawide. There`s roughly a 30-40% chance of IFR/LIFR redevelopment overnight/Wednesday morning in pockets of the interior (as winds become light or calm overnight out of the north). Some of the lower ceilings may drop to the ground ...
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