Index, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Index, a town in King County, Washington.
Tonight
52°F
Partly Cloudy
Partly cloudy, with a low around 52. East northeast wind around 2 mph.
7-day forecast for Index
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Partly Cloudy | 2 mph ENE | 0% |
| Saturday | 73°F | Mostly Sunny | 0 to 3 mph WNW | 1% |
| Saturday Night | 54°F | Mostly Clear | 0 to 3 mph NNE | 0% |
| Sunday | 76°F | Sunny | 3 mph N | 0% |
| Sunday Night | 54°F | Mostly Clear | 0 to 3 mph NE | 0% |
| Monday | 71°F | Mostly Sunny | 1 to 5 mph SE | 0% |
| Monday Night | 52°F | Partly Cloudy | 0 to 3 mph N | 0% |
| Tuesday | 66°F | Partly Sunny | 0 to 5 mph S | 0% |
| Tuesday Night | 50°F | Mostly Cloudy | 1 to 5 mph NNE | 11% |
| Wednesday | 65°F | Partly Sunny | 5 mph WSW | 13% |
| Wednesday Night | 50°F | Mostly Cloudy | 1 to 5 mph E | 14% |
| Thursday | 64°F | Mostly Cloudy then Slight Chance Light Rain | 1 to 5 mph N | 20% |
| Thursday Night | 49°F | Slight Chance Light Rain | 3 mph NNE | 21% |
| Friday | 62°F | Slight Chance Light Rain | 5 mph N | 22% |
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
Nearby towns & communities
Algona
Ames Lake
Auburn
Baring
Beaux Arts Village
Bellevue
Black Diamond
Bothell
Boulevard Park
Bryn Mawr-Skyway
Burien
Carnation
Clyde Hill
Cottage Lake
Covington
Des Moines
Duvall
East Renton Highlands
Fairwood
Fall City
Federal Way
Greenwater
High Bridge
Hobart
Hunts Point
Issaquah
Kenmore
Kent
Kirkland
Lake Forest Park
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 Sep 19, 2026.