Waterloo, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waterloo, a town in Dekalb County, Indiana.
This Afternoon
74°F
Mostly Sunny
Mostly sunny, with a high near 74. East wind around 5 mph.
7-day forecast for Waterloo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Mostly Sunny | 5 mph E | 2% |
| Tonight | 57°F | Partly Cloudy then Slight Chance Rain Showers | 5 mph E | 17% |
| Saturday | 74°F | Showers And Thunderstorms | 5 to 10 mph SE | 90% |
| Saturday Night | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph S | 84% |
| Sunday | 72°F | Showers And Thunderstorms | 5 to 10 mph N | 80% |
| Sunday Night | 53°F | Chance Showers And Thunderstorms | 10 mph NE | 52% |
| Monday | 65°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 49% |
| Monday Night | 50°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 35% |
| Tuesday | 64°F | Mostly Cloudy then Slight Chance Rain Showers | 15 mph NE | 19% |
| Tuesday Night | 52°F | Slight Chance Rain Showers | 10 to 15 mph NE | 22% |
| Wednesday | 64°F | Slight Chance Rain Showers | 10 mph NE | 22% |
| Wednesday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 18% |
| Thursday | 67°F | Partly Sunny | 5 to 10 mph N | 8% |
| Thursday Night | 51°F | Mostly Cloudy | 5 to 10 mph NE | 7% |
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 Sep 19, 2026.