Grand Junction in Summer
In summer (June, July and August), Grand Junction sees average daytime highs around 84°F and overnight lows near 57°F, with 6.4 in of rain over about 25 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 84°F. The sky is clear or mostly clear about 49% of the time across summer, and the air most often feels dry.
Summer is Grand Junction's best season of the year to visit on our travel score. For the whole year in context, see Grand Junction's year-round climate.
- Avg daytime high
- 84°F
- warmest season of the year
- Avg overnight low
- 57°F
- Rainfall
- 6.4 in
- 25 wet days
- Avg wind
- 4 mph
- Travel score
- 6.0
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Grand Junction in Summer
Across summer, daytime highs hold fairly steady around 84°F.
A typical summer day in Grand Junction reaches about 84°F and drops to 57°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Grand Junction
Once humidity and wind are folded in, summer brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Grand Junction weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 34° / 13° | 1.5 | 7.5 | 7.2 | 9.6 | 0.0 |
| Feb | 39° / 19° | 1.7 | 9 | 8.1 | 10.5 | 0.0 |
| Mar | 49° / 27° | 2.0 | 9.5 | 6.5 | 11.7 | 2.2 |
| Apr | 58° / 34° | 2.0 | 9.7 | 3.8 | 13 | 4.5 |
| May | 70° / 44° | 1.9 | 8.8 | 0.6 | 14.1 | 6.8 |
| Jun | 82° / 53° | 1.0 | 4.8 | 0 | 14.7 | 7.0 |
| Jul | 87° / 60° | 2.2 | 8.6 | 0 | 14.5 | 5.1 |
| Aug | 83° / 58° | 3.2 | 11.7 | 0 | 13.5 | 5.9 |
| Sep | 75° / 49° | 2.7 | 8.9 | 0.1 | 12.3 | 7.3 |
| Oct | 62° / 37° | 2.0 | 8.1 | 1.6 | 11 | 5.8 |
| Nov | 47° / 25° | 1.7 | 7 | 4.9 | 9.9 | 1.6 |
| Dec | 35° / 15° | 1.5 | 7.3 | 7.3 | 9.3 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 49% of the time across summer.
Chance of precipitation in Summer
Grand Junction gets around 6.4 in of rain over 25 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 4 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 30 min in early June to 12 h 54 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 7.5 kWh/m².
Is summer a good time to visit Grand Junction?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Grand Junction for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Grand Junction in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Grand Junction sees daytime highs around 84°F and nights near 57°F. Pack light clothes and sun protection. Worth having: rain gear. About 25 days see rain.
UV index in Grand Junction in Summer
Clear-sky midday UV across summer averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Grand Junction peaks around July 16 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 6 | 6 | 8 | 11 | 11 | 10 | 7 | 6 | 3 | 2 |
| Level | Moderate | Moderate | High | High | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 6 | High |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Extreme |
| Sep | 7 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Where is Grand Junction?
Grand Junction sits at 39.1°N, 108.6°W, 4,593 ft above sea level, in United States. The nearest listed city is Clifton, 5.6 mi away.
Topography around Grand Junction
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Grand Junction.
Within 2 miles, the terrain around Grand Junction has only modest variations in elevation — a maximum elevation change of 308 ft around an average of 4,613 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,176 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,178 ft.
The land around Grand Junction is covered by artificial surfaces (53%) within 2 miles, grassland (29%) within 10 miles, and trees (38%), shrubs (24%) and grassland (24%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Grand Junction (39.0639°, -108.5507°, elevation 4,593 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.