Index, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Index, a town in King County, Washington.
This Afternoon
57°F
Partly Sunny
Partly sunny. High near 57, with temperatures falling to around 52 in the afternoon. North northwest wind around 1 mph.
7-day forecast for Index
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 57°F | Partly Sunny | 1 mph NNW | 3% |
| Tonight | 42°F | Partly Cloudy | 3 mph ENE | 4% |
| Wednesday | 58°F | Mostly Sunny | 2 mph NNW | 9% |
| Wednesday Night | 45°F | Light Rain | 2 mph SSW | 100% |
| Thursday | 52°F | Light Rain | 2 mph SSW | 94% |
| Thursday Night | 44°F | Light Rain | 3 mph SE | 90% |
| Friday | 52°F | Light Rain | 3 mph ESE | 90% |
| Friday Night | 47°F | Light Rain Likely | 5 mph SE | 68% |
| Saturday | 58°F | Chance Light Rain | 7 mph ESE | 30% |
| Saturday Night | 47°F | Rain | 6 to 12 mph SSE | 89% |
| Sunday | 52°F | Rain | 2 to 6 mph SW | 89% |
| Sunday Night | 42°F | Chance Light Rain | 2 to 6 mph SE | 36% |
| Monday | 54°F | Chance Light Rain | 2 to 6 mph ESE | 50% |
| Monday Night | 45°F | Rain Likely | 2 to 6 mph ESE | 72% |
Forecast source: National Weather Service (api.weather.gov) for Index (47.821, -121.556). Updated through the day.
Growing snapshot for Index
Last spring frost
Apr 14
First fall frost
Oct 29
Growing season
197 days
Hardiness zone
8a
More local growing data for Index: nearby ZIP 98224 weather · frost dates · planting calendar · Washington frost dates
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Climate data from the nearest NOAA station, Baring, Wa (4.8 mi from Index). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.