Great Sand Dunes National Park and Preserve
Weather History, Monthly Averages & Best Time to Visit
CORocky Mountain8,200 ft
Look Up a Specific Date
Best Time to Visit
RecommendedJune - September
July and August have the most accessible trails and roads.
AvoidOctober - May (many roads and facilities closed due to snow)
Tip: High-elevation areas may have snow into July. Check road status before visiting.
Monthly Climate Averages
Historical temperature and precipitation averages for Alamosa, CO, based on 55+ years of weather data.
Warmest MonthJulyAvg High: 82°F / Low: 47°F
Coldest MonthJanuaryAvg High: 35°F / Low: -2°F
Jan
35°/ -2°
💧 2.3"
❄️ 1.3"
Feb
41°/ 7°
💧 1.8"
❄️ 1.0"
Mar
52°/ 17°
💧 2.7"
❄️ 1.3"
Apr
60°/ 24°
💧 3.1"
❄️ 1.5"
May
69°/ 33°
💧 3.3"
❄️ 1.4"
Jun
79°/ 41°
💧 2.8"
❄️ 0.2"
Jul
82°/ 47°
💧 3.0"
Aug
80°/ 45°
💧 3.1"
Sep
74°/ 37°
💧 3.8"
❄️ 5.1"
Oct
63°/ 25°
💧 3.7"
❄️ 1.9"
Nov
49°/ 12°
💧 2.8"
❄️ 1.4"
Dec
37°/ 1°
💧 2.1"
❄️ 1.1"
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Data from Alamosa, CO. Expect ~29°F cooler at elevation.
Seasonal Weather
Gateway Cities
Official NPS Websitenps.gov/grsa
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