Portland, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portland, a city in Jay County, Indiana.
Overnight
58°F
Mostly Cloudy
Mostly cloudy, with a low around 58. East wind around 5 mph.
7-day forecast for Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Mostly Cloudy | 5 mph E | 3% |
| Saturday | 81°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph SE | 60% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 5 mph S | 49% |
| Sunday | 79°F | Chance Showers And Thunderstorms | 5 to 10 mph NW | 62% |
| Sunday Night | 55°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 61% |
| Monday | 67°F | Chance Rain Showers | 10 to 15 mph NE | 52% |
| Monday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 46% |
| Tuesday | 66°F | Slight Chance Rain Showers | 10 to 15 mph NE | 19% |
| Tuesday Night | 54°F | Slight Chance Rain Showers | 5 to 15 mph NE | 21% |
| Wednesday | 68°F | Slight Chance Rain Showers | 5 to 10 mph NE | 19% |
| Wednesday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph N | 16% |
| Thursday | 69°F | Partly Sunny | 5 to 10 mph N | 10% |
| Thursday Night | 53°F | Mostly Cloudy | 5 to 10 mph N | 10% |
| Friday | 70°F | Partly Sunny | 5 to 10 mph N | 4% |
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 Sep 19, 2026.