Grand Junction, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Junction, a city in Greene County, Iowa.
Today
79°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 79, with temperatures falling to around 75 in the afternoon. North northwest wind 5 to 9 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grand Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Chance Showers And Thunderstorms | 5 to 9 mph NNW | 48% |
| Tonight | 60°F | Showers And Thunderstorms | 5 to 9 mph N | 85% |
| Wednesday | 74°F | Chance Showers And Thunderstorms | 6 mph ENE | 35% |
| Wednesday Night | 54°F | Mostly Clear | 3 mph E | 7% |
| Thursday | 81°F | Mostly Sunny | 0 to 5 mph ESE | 1% |
| Thursday Night | 60°F | Mostly Clear | 3 mph SSE | 2% |
| Friday | 85°F | Sunny | 2 to 8 mph S | 6% |
| Friday Night | 65°F | Mostly Clear | 3 to 7 mph S | 13% |
| Saturday | 90°F | Sunny | 3 to 10 mph S | 12% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 10 mph S | 16% |
| Sunday | 89°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 mph SSE | 16% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 7 to 10 mph SSE | 31% |
| Monday | 89°F | Chance Showers And Thunderstorms then Partly Sunny | 13 mph SSE | 31% |
| Monday Night | 70°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 12 mph ESE | 23% |
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 Aug 4, 2026.