Marietta-Alderwood, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marietta-Alderwood, a community in Whatcom County, Washington.
Today
57°F
Partly Sunny then Chance Light Rain
A chance of rain after 4pm. Partly sunny. High near 57, with temperatures falling to around 54 in the afternoon. East southeast wind 1 to 15 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Marietta-Alderwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 57°F | Partly Sunny then Chance Light Rain | 1 to 15 mph ESE | 45% |
| Tonight | 47°F | Light Rain | 14 to 18 mph S | 92% |
| Thursday | 56°F | Mostly Sunny | 10 to 14 mph S | 13% |
| Thursday Night | 46°F | Light Rain | 10 to 22 mph SE | 94% |
| Friday | 54°F | Light Rain | 15 to 26 mph SE | 94% |
| Friday Night | 46°F | Light Rain Likely | 5 to 15 mph ESE | 71% |
| Saturday | 61°F | Chance Light Rain | 5 to 10 mph ESE | 39% |
| Saturday Night | 48°F | Light Rain | 10 to 23 mph SSE | 86% |
| Sunday | 55°F | Light Rain Likely | 6 to 20 mph S | 61% |
| Sunday Night | 41°F | Slight Chance Light Rain | 6 mph SE | 17% |
| Monday | 54°F | Chance Light Rain | 6 mph E | 44% |
| Monday Night | 46°F | Light Rain Likely | 6 to 18 mph SE | 67% |
| Tuesday | 56°F | Light Rain Likely | 14 to 22 mph SE | 67% |
| Tuesday Night | 47°F | Light Rain Likely | 14 to 18 mph SE | 62% |
Forecast source: National Weather Service (api.weather.gov) for Marietta-Alderwood (48.788, -122.555). Updated through the day.
Growing snapshot for Marietta-Alderwood
Last spring frost
Apr 1
First fall frost
Nov 2
Growing season
216 days
Hardiness zone
8b
More local growing data for Marietta-Alderwood: nearby ZIP 98225 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Acme
Bellingham
Birch Bay
Blaine
Custer
Deming
Everson
Ferndale
Geneva
Glacier
Kendall
Lynden
Maple Falls
Nooksack
Peaceful Valley
Point Roberts
Sudden Valley
Sumas
Climate data from the nearest NOAA station, Bellingham 3 Ssw, Wa (2.8 mi from Marietta-Alderwood). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.