Grand Junction, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Junction, a city in Greene County, Iowa.
This Afternoon
76°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy. High near 76, with temperatures falling to around 70 in the afternoon. North northwest wind 6 to 9 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grand Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Slight Chance Showers And Thunderstorms | 6 to 9 mph NNW | 23% |
| Tonight | 60°F | Chance Showers And Thunderstorms | 9 mph N | 25% |
| Sunday | 65°F | Chance Drizzle | 12 mph NE | 41% |
| Sunday Night | 54°F | Rain Showers Likely | 9 mph NE | 70% |
| Monday | 59°F | Rain Showers | 9 mph NE | 86% |
| Monday Night | 50°F | Rain Showers | 5 to 8 mph NE | 77% |
| Tuesday | 62°F | Partly Sunny | 6 mph NE | 10% |
| Tuesday Night | 45°F | Partly Cloudy | 1 to 5 mph ENE | 2% |
| Wednesday | 65°F | Mostly Sunny | 5 mph E | 0% |
| Wednesday Night | 50°F | Partly Cloudy | 2 mph ESE | 13% |
| Thursday | 67°F | Chance Rain Showers | 2 to 6 mph SE | 29% |
| Thursday Night | 55°F | Slight Chance Rain Showers | 3 mph SE | 24% |
| Friday | 70°F | Slight Chance Rain Showers | 2 to 6 mph ESE | 18% |
| Friday Night | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph ESE | 16% |
Forecast source: National Weather Service (api.weather.gov) for Grand Junction (42.033, -94.237). Updated through the day.
Growing snapshot for Grand Junction
Last spring frost
Apr 26
First fall frost
Oct 9
Growing season
164 days
Hardiness zone
5a
More local growing data for Grand Junction: nearby ZIP 50107 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Jefferson, Ia (9.2 mi from Grand Junction). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.