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Grand Junction Weather by Month
Average temperatures, rainfall and humidity for Grand Junction, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Grand Junction month looks like before you travel — then check the live Grand Junction forecast for the days ahead.
Warmest month
July
34°C average high
Coolest month
January
-5°C average low
Wettest month
May
51 mm of rain
Driest month
June
12 mm of rain
Average temperature and rainfall in Grand Junction by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 3°C | -5°C | -28°C / 15°C | 20 mm | 77% | 8 km/h |
| February | 7°C | -3°C | -24°C / 18°C | 25 mm | 69% | 9 km/h |
| March | 12°C | 1°C | -13°C / 31°C | 30 mm | 60% | 11 km/h |
| April | 17°C | 4°C | -8°C / 29°C | 31 mm | 52% | 12 km/h |
| May | 22°C | 9°C | -6°C / 34°C | 51 mm | 48% | 11 km/h |
| June | 30°C | 14°C | 3°C / 37°C | 12 mm | 37% | 11 km/h |
| July | 34°C | 19°C | 8°C / 41°C | 14 mm | 37% | 10 km/h |
| August | 32°C | 17°C | 6°C / 39°C | 20 mm | 41% | 9 km/h |
| September | 27°C | 13°C | -1°C / 38°C | 35 mm | 46% | 9 km/h |
| October | 18°C | 5°C | -11°C / 31°C | 22 mm | 57% | 9 km/h |
| November | 10°C | 0°C | -15°C / 23°C | 17 mm | 65% | 9 km/h |
| December | 4°C | -4°C | -22°C / 17°C | 25 mm | 75% | 8 km/h |
Best time to visit Grand Junction
The most comfortable time to visit Grand Junction is generally May to June and September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around May, totalling about 302 mm a year.
Travellers who prefer heat should aim for July, when highs average 34°C. May is the month to avoid if rain would spoil your plans — it averages 51 mm, roughly 4× the rainfall of the driest month (June).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Grand Junction forecast for what is happening now.