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Grand Prismatic Spring

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Grand Prismatic Spring Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Grand Prismatic Spring year round climate

  • Spring (March–May): Average -5.3°C–5.8°C, cold climate, moderate rainfall, windy. Common activities: Appreciate the color changes of Grand Prismatic Spring (if not snow-covered), hiking (dress warmly). Recommended clothing: Heavy coat, thermal underwear, waterproof pants and jacket, warm hat, gloves, scarf.
  • Summer (June–August): Average 11.5°C–16.4°C, mild climate, more rainfall in June, less rainfall in other months. Common activities: Hiking, viewing geothermal landscapes. Recommended clothing: Light jacket, long-sleeved shirt, comfortable and breathable pants, rain gear.
  • Autumn (September–November): Average 3.2°C–10.3°C, cool climate, moderate rainfall. Common activities: Hiking, appreciating autumn colors (pay attention to weather changes). Recommended clothing: Warm jacket, long-sleeved shirt, comfortable pants, rain gear.
  • Winter (December–February): Average -9.8°C–-1.5°C, cold climate, possible snowfall, moderate rainfall. Common activities: Enjoying snow scenery (if snow-covered), hot spring relaxation (if hot spring facilities are nearby). Recommended clothing: Down jacket or heavy coat, thermal underwear, waterproof pants and jacket, warm hat, gloves, scarf, waterproof snow boots.

Grand Prismatic Spring climatological average

Annual average temperature: approx. 1.9°C / Annual rainfall: approx. 601 mm / Summer humidity: 60%–70% / Rainiest month: June

Grand Prismatic Spring monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
-9.8°C
31.9
February
-8.7°C
39.7
March
-5.3°C
47.3
April
-1.5°C
45.3
May
5.8°C
66.3
June
11.5°C
82.4
July
16.4°C
18.6
August
14.9°C
70.2
September
10.3°C
52.2
October
3.2°C
56.4
November
-6.1°C
45.1
December
-8.3°C
45.6

Grand Prismatic Spring weather for the next seven days

8/7
Friday
Sunny
30.5°C/8.4°C
8/8
Saturday
Sunny
30.8°C/9.5°C
8/9
Sunday
Sunny
29.9°C/9°C
8/10
Monday
Sunny
30.1°C/8.4°C
8/11
Tuesday
Sunny
30.2°C/8.6°C
8/12
Wednesday
Sunny
29.8°C/9.7°C
8/13
Thursday
Sunny
29.3°C/8.9°C

Grand Prismatic Spring Frequently Asked Questions and Useful Information for Travel

How long does it take to walk the Grand Prismatic Spring overlook trail?

The Grand Prismatic Hot Spring Overlook Trail is an out-and-back trail that covers 1.5 miles with an elevation gain of 200 feet. It typically takes about 0.5 to 1 hour to complete the hike to the overlook.

Can you swim at Grand Prismatic Spring?

No, swimming or soaking in Grand Prismatic Spring is strictly prohibited by the National Park Service. Entering the hot springs can be extremely dangerous and has led to severe burns and fatalities.

What is the best time to visit Grand Prismatic Spring for optimal viewing?

The best time to see Grand Prismatic Spring is in the late afternoon, ideally after 3 or 4 PM, when the steam has typically dissipated, and crowds are thinner. Visiting on a sunny day will enhance the vibrant colors, but aim to go before midday congestion. Summer offers the best heat, minimizing steam issues.

Where is Grand Prismatic Spring located?

Grand Prismatic Spring is located in the Midway Geyser Basin within Yellowstone National Park, Wyoming, United States. It is the largest hot spring in the U.S., renowned for its stunning rainbow colors created by thermophilic bacteria.

What are the key considerations for visiting Grand Prismatic Spring?

To best experience Grand Prismatic Spring, consider visiting in the late afternoon on a sunny day to avoid obscuring steam and enjoy vibrant colors. The overlook trail on the Fairy Falls Trail provides a superior panoramic view compared to the boardwalk. Be aware that parking lots at Midway Geyser Basin can become very congested, especially during peak hours.