Waterloo, OR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waterloo, a town in Linn County, Oregon.
This Afternoon
59°F
Light Rain Likely
Rain likely after 4pm. Mostly cloudy. High near 59, with temperatures falling to around 55 in the afternoon. South wind around 5 mph. Chance of precipitation is 70%.
7-day forecast for Waterloo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Light Rain Likely | 5 mph S | 69% |
| Tonight | 45°F | Light Rain Likely | 2 to 8 mph S | 74% |
| Thursday | 59°F | Patchy Fog then Mostly Sunny | 2 mph SSE | 3% |
| Thursday Night | 39°F | Patchy Fog then Mostly Cloudy | 3 mph ESE | 0% |
| Friday | 61°F | Slight Chance Light Rain | 3 mph SSE | 24% |
| Friday Night | 43°F | Slight Chance Light Rain then Mostly Cloudy | 2 to 6 mph SE | 24% |
| Saturday | 65°F | Mostly Sunny | 2 mph S | 8% |
| Saturday Night | 46°F | Light Rain | 2 to 12 mph S | 77% |
| Sunday | 56°F | Light Rain | 1 to 7 mph SSW | 77% |
| Sunday Night | 41°F | Mostly Cloudy | 1 mph ENE | 6% |
| Monday | 58°F | Partly Sunny | 0 to 3 mph S | 12% |
| Monday Night | 43°F | Chance Light Rain | 2 to 8 mph S | 27% |
| Tuesday | 60°F | Chance Light Rain | 7 mph S | 32% |
| Tuesday Night | 45°F | Chance Light Rain | 5 to 12 mph S | 31% |
Forecast source: National Weather Service (api.weather.gov) for Waterloo (44.495, -122.824). Updated through the day.
Growing snapshot for Waterloo
Last spring frost
Mar 14
First fall frost
Nov 18
Growing season
248 days
Hardiness zone
8b
More local growing data for Waterloo: nearby ZIP 97355 weather · frost dates · planting calendar · Oregon frost dates
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Climate data from the nearest NOAA station, Lebanon, Or (4 mi from Waterloo). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.