Portland, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portland, a city in Jay County, Indiana.
Overnight
55°F
Clear
Clear, with a low around 55. Southeast wind around 0 mph.
7-day forecast for Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Clear | 0 mph | 0% |
| Tuesday | 81°F | Sunny | 0 mph | 0% |
| Tuesday Night | 59°F | Mostly Clear | 0 mph | 0% |
| Wednesday | 83°F | Sunny | 0 to 5 mph SW | 0% |
| Wednesday Night | 64°F | Mostly Clear | 0 mph | 5% |
| Thursday | 82°F | Partly Sunny then Showers And Thunderstorms Likely | 0 to 5 mph SW | 55% |
| Thursday Night | 65°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 5 mph SW | 62% |
| Friday | 81°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 5 mph SW | 62% |
| Friday Night | 65°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 48% |
| Saturday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 15% |
| Saturday Night | 66°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 15% |
| Sunday | 85°F | Mostly Sunny | 5 to 10 mph SW | 13% |
| Sunday Night | 69°F | Partly Cloudy then Slight Chance Rain Showers | 5 to 10 mph SW | 16% |
| Monday | 85°F | Chance Showers And Thunderstorms | 10 mph SW | 25% |
Forecast source: National Weather Service (api.weather.gov) for Portland (40.438, -84.983). Updated through the day.
Growing snapshot for Portland
Last spring frost
Apr 28
First fall frost
Oct 15
Growing season
171 days
Hardiness zone
6a
More local growing data for Portland: nearby ZIP 47371 weather · frost dates · planting calendar · Indiana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Portland 1 Sw, In (1.6 mi from Portland). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.