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
66°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. Low around 66, with temperatures rising to around 68 overnight. South wind around 7 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Grand Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Chance Showers And Thunderstorms | 7 mph S | 52% |
| Saturday | 79°F | Chance Showers And Thunderstorms | 7 mph WNW | 46% |
| Saturday Night | 60°F | Chance Showers And Thunderstorms | 9 mph N | 28% |
| Sunday | 67°F | Chance Rain Showers | 12 mph NNE | 44% |
| Sunday Night | 55°F | Chance Rain Showers | 10 mph ENE | 42% |
| Monday | 61°F | Rain Showers Likely | 10 mph ENE | 69% |
| Monday Night | 50°F | Rain Showers Likely | 5 to 8 mph NE | 61% |
| Tuesday | 61°F | Mostly Cloudy | 7 mph ENE | 14% |
| Tuesday Night | 46°F | Partly Cloudy | 5 mph E | 2% |
| Wednesday | 66°F | Mostly Sunny | 3 mph E | 3% |
| Wednesday Night | 50°F | Mostly Cloudy | 2 mph SE | 7% |
| Thursday | 68°F | Slight Chance Rain Showers | 3 mph SE | 21% |
| Thursday Night | 53°F | Mostly Cloudy then Slight Chance Rain Showers | 2 mph SE | 15% |
| Friday | 68°F | Slight Chance Rain Showers | 1 to 5 mph ESE | 15% |
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.