Late summer · Weather & things to do
Yellowstone in August
Little changes in Yellowstone from July: highs stay near 71°F (22°C), lows near 44°F (6°C), and about 1.6 in (40 mm) of rain falls.
At 96/100 for comfort (2nd of 12), it's one of the best months to visit.
- Avg high
- 71°F (22°C)
- Avg low
- 44°F (6°C)
- Rain
- 1.6 in (40 mm)
- Humidity
- 53%
- Cloud cover
- 43%
- Daylight
- ~13 h 52 min
- Comfort score
- 96/100 · Great
What August feels like
Warm afternoons near 71°F (22°C) make long days outdoors easy.
Mornings start much cooler: lows average 44°F (6°C), about 15°C (27°F) below the afternoon high.
Rain is moderate at about 1.6 in (40 mm) for the month.
Plan around August
August is one of Yellowstone's best months on the climate data.
- Last warm month for a while: September highs fall to 60°F.
- Comfort holds steady from July (97 → 96/100).
- Our Grand Teton, Jackson & Yellowstone route recommends Mid-Dec – Mar, so August falls outside its suggested window.
What to pack for August
- Light, breathable clotheshighs average 71°F
- Sunscreen, sunglasses and a hathigh UV on clear days
- A warm layer for eveningsnights drop to 44°F
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Yellowstone in August
With conditions on your side, the picks below favor time outside.
Grand Prismatic Spring
The largest hot spring in the United States, in Midway Geyser Basin; in winter its steam drifts over the Firehole River.
Why now August scores 96/100 for comfort, good conditions for being outside.
Mammoth Hot Springs
Travertine terraces near the North Entrance, steaming and frosted in winter, with boardwalks you can walk on your own.
Why now Highs near 71°F and 1.6 in of monthly rain make this an easy outdoor pick.
Old Faithful
Yellowstone's best-known geyser, erupting about every 60 to 110 minutes; in winter the plume of steam towers over the snow.
Why now One to do outside while the weather is on your side.
Grand Canyon of the Yellowstone
Yellow-walled canyon where the 308-foot Lower Falls builds a huge cone of ice in winter.
Nearby in August
- Yellowstone National Park in August~13 mi · highs 71°F, 1.6 in rain · similar daytime temperatures, about as wet
- Grand Teton National Park in August~57 mi · highs 76°F, 1.4 in rain · 3°C (5°F) warmer by day, about as wet
- Jackson in August~79 mi · highs 80°F, 1.2 in rain · 5°C (10°F) warmer by day, about as wet
- Salt Lake City in August~274 mi · highs 90°F, 0.9 in rain · 11°C (19°F) warmer by day, drier
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Yellowstone in August: quick answers
Is August a good time to visit Yellowstone?
Yes. On the climate data it's one of the best months, scoring 96/100. Expect highs of 71°F (22°C) and 1.6 in (40 mm) of rain. Our Grand Teton, Jackson & Yellowstone route recommends Mid-Dec – Mar, so August is outside its suggested window.
How hot is Yellowstone in August?
Average highs are 71°F (22°C) and average lows 44°F (6°C), making it the 2nd-warmest month by daytime highs.
Does it rain a lot in Yellowstone in August?
Not much: about 1.6 in (40 mm) of rain falls across August on average, the 2nd-driest month of the year. The annual total is about 32.8 in (834 mm).
What should I pack for Yellowstone in August?
Bring light, breathable clothes (highs average 71°F), sunscreen, sunglasses and a hat (high UV on clear days), a warm layer for evenings (nights drop to 44°F) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Yellowstone
Planning Yellowstone in August?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.