Waterloo, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waterloo, a town in Dekalb County, Indiana.
Today
84°F
Sunny
Sunny, with a high near 84. South wind 0 to 5 mph.
7-day forecast for Waterloo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Sunny | 0 to 5 mph S | 0% |
| Tonight | 59°F | Mostly Clear | 0 to 5 mph S | 0% |
| Wednesday | 86°F | Sunny | 0 to 5 mph SW | 0% |
| Wednesday Night | 65°F | Mostly Cloudy then Chance Showers And Thunderstorms | 0 to 5 mph SW | 48% |
| Thursday | 83°F | Showers And Thunderstorms Likely | 0 to 5 mph SW | 72% |
| Thursday Night | 64°F | Showers And Thunderstorms Likely | 0 to 5 mph SW | 72% |
| Friday | 84°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 39% |
| Friday Night | 63°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 39% |
| Saturday | 85°F | Mostly Sunny | 0 to 10 mph SW | 12% |
| Saturday Night | 66°F | Partly Cloudy then Slight Chance Rain Showers | 5 mph SW | 18% |
| Sunday | 87°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 18% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 15 mph SW | 39% |
| Monday | 87°F | Chance Rain Showers | 10 mph SW | 39% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 47% |
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 Aug 4, 2026.