Late summer · Weather & things to do
Yellowstone National Park in August
Little changes in Yellowstone National Park from July: highs stay near 71°F (22°C), lows near 44°F (7°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 (7°C)
- Rain
- 1.6 in (40 mm)
- Humidity
- 53%
- Cloud cover
- 43%
- Daylight
- ~13 h 51 min
- Comfort score
- 96/100 · Great
What August feels like
Highs settle around 71°F (22°C), warm enough for short sleeves most of the day.
Mornings start much cooler: lows average 44°F (7°C), about 15°C (27°F) below the afternoon high.
About 1.6 in (40 mm) of rain falls in a typical year's August.
Plan around August
August is one of Yellowstone National Park's best months on the climate data.
- Last warm month for a while: September highs fall to 61°F.
- Comfort holds steady from July (97 → 96/100).
- August sits inside the Jun – Sep window our Glacier to Yellowstone route recommends.
What to pack for August
- Light, breathable clothes71°F afternoons
- Sunscreen, sunglasses and a hatstrong sun this month
- A warm layer for eveningsnights drop to 44°F
- Comfortable walking shoesmost picks involve some walking
What to do in Yellowstone National Park in August
With conditions on your side, the picks below favor time outside.
Mammoth Hot Springs Terraces
Travertine terraces built by hot springs, with boardwalks and elk around the village.
Why now August scores 96/100 for comfort, good conditions for being outside.
Hayden Valley
Open valley along the Yellowstone River with bison herds and frequent wolf and bear sightings.
Why now Highs near 71°F and 1.6 in of monthly rain make this an easy outdoor pick.
Norris Geyser Basin
The park's hottest, most acidic basin, home to Steamboat, the world's tallest active geyser.
Why now One to do outside while the weather is on your side.
Fairy Falls Trail Grand Prismatic Overlook
Short climb to a raised platform above Grand Prismatic Spring for the full color rings.
Lake Yellowstone Hotel Dining Room
Dining room in the park's oldest hotel, overlooking Yellowstone Lake.
Nearby in August
- Yellowstone in August~13 mi · highs 71°F, 1.6 in rain · similar daytime temperatures, about as wet
- Grand Teton National Park in August~44 mi · highs 76°F, 1.4 in rain · 3°C (5°F) warmer by day, about as wet
- Jackson in August~67 mi · highs 80°F, 1.2 in rain · 5°C (9°F) warmer by day, about as wet
- Salt Lake City in August~262 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 National Park in August: quick answers
Is August a good time to visit Yellowstone National Park?
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. August is inside the Jun – Sep window our Glacier to Yellowstone route recommends.
How hot is Yellowstone National Park in August?
Average highs are 71°F (22°C) and average lows 44°F (7°C), making it the 2nd-warmest month by daytime highs.
Does it rain a lot in Yellowstone National Park 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 National Park in August?
Bring light, breathable clothes (71°F afternoons), sunscreen, sunglasses and a hat (strong sun this month), a warm layer for evenings (nights drop to 44°F) and comfortable walking shoes (most picks involve some walking).
More on Yellowstone National Park
Routes in season in August
- Glacier to Yellowstone Jun – Sep
Planning Yellowstone National Park 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.