Grand Junction, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Junction, a city in Greene County, Iowa.
Overnight
43°F
Chance Rain Showers
A chance of rain showers. Cloudy. Low around 43, with temperatures rising to around 45 overnight. West northwest wind 7 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grand Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 43°F | Chance Rain Showers | 7 to 14 mph WNW | 30% |
| Wednesday | 50°F | Chance Rain Showers then Cloudy | 14 mph W | 26% |
| Wednesday Night | 42°F | Cloudy then Chance Rain Showers | 12 mph WNW | 32% |
| Thursday | 52°F | Chance Rain Showers then Mostly Cloudy | 12 mph NW | 28% |
| Thursday Night | 37°F | Mostly Cloudy | 5 to 9 mph N | 4% |
| Friday | 50°F | Partly Sunny | 5 mph N | 2% |
| Friday Night | 28°F | Partly Cloudy | 2 mph NNE | 0% |
| Saturday | 53°F | Mostly Sunny | 3 mph SSW | 0% |
| Saturday Night | 35°F | Mostly Clear | 3 mph W | 1% |
| Sunday | 59°F | Sunny | 5 mph W | 0% |
| Sunday Night | 37°F | Clear | 3 mph SW | 0% |
| Monday | 65°F | Sunny | 3 to 8 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 5 mph WNW | 0% |
| Tuesday | 63°F | Sunny | 3 mph NNW | 0% |
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 Nov 4, 2026.