Waterloo, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waterloo, a town in Dekalb County, Indiana.
This Afternoon
67°F
Scattered Rain Showers
Scattered rain showers. Mostly cloudy, with a high near 67. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
7-day forecast for Waterloo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Scattered Rain Showers | 15 mph SW | 50% |
| Tonight | 48°F | Mostly Cloudy | 5 to 10 mph SW | 10% |
| Thursday | 56°F | Mostly Cloudy | 10 to 15 mph SW | 13% |
| Thursday Night | 41°F | Rain Showers Likely | 5 to 10 mph W | 58% |
| Friday | 50°F | Chance Rain Showers | 5 to 15 mph NW | 29% |
| Friday Night | 34°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 29% |
| Saturday | 50°F | Partly Sunny | 5 to 10 mph NW | 1% |
| Saturday Night | 31°F | Partly Cloudy | 0 to 5 mph W | 0% |
| Sunday | 54°F | Sunny | 5 to 15 mph W | 1% |
| Sunday Night | 34°F | Mostly Clear | 5 to 10 mph W | 1% |
| Monday | 58°F | Sunny | 5 to 10 mph W | 1% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph SW | 0% |
| Tuesday | 60°F | Sunny | 5 to 10 mph W | 0% |
| Tuesday Night | 36°F | Mostly Clear | 0 to 5 mph NW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Waterloo (41.437, -85.052). Updated through the day.
Growing snapshot for Waterloo
Last spring frost
May 2
First fall frost
Oct 10
Growing season
159 days
Hardiness zone
6a
More local growing data for Waterloo: nearby ZIP 46793 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Garrett 1 S, In (9.6 mi from Waterloo). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.