Manhattan Project National Historical Park in August
August at Manhattan Project National Historical Park averages a daytime high near 80°F and an overnight low around 55°F, with about 3.2" of precipitation. Visitation runs about 1.4× the park's average month, which makes August a busy month here.
- Average low
- 55°F
- Average high
- 80°F
Range across the year: 21°F to 83°F
- Precipitation
- 3.2 in
- Daylight
- 13.4 hours
Roughly 11% of the park's yearly visitors come in August: roughly 7,400 recreation visits in a typical year, based on National Park Service monthly counts from 2016 to 2025.
That makes August the 3rd-busiest of the park's twelve months, sitting between the July peak (1.7×) and the January low (0.3×).
On our Best Time to Visit score August rates 59/100 ("Fair"). Our recommended month is May: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 67°F is a comfortable range for hiking and being outdoors all day. These figures are 1991–2020 NOAA climate normals from the nearest station, about 1.6 miles from the park.
August falls inside the park's busiest stretch: June, July and August together pull about 37% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.
You'll have about 13.4 hours of daylight in August to explore — between the 9.6-hour midwinter low and the 14.4-hour summer high.
Park-wide, 2025 drew 56,390 recreation visits, down 24.5% from 74,693 in 2024.
Across the past decade overall visitation has eased about 43.1%, so August may feel a touch quieter than it once did.
How August compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| July | 83°F / 57°F | 1.7× Very busy | 51 Fair |
| August | 80°F / 55°F | 1.4× Busy | 59 Fair |
| September | 74°F / 49°F | 1.2× Busy | 56 Fair |
All twelve months at Manhattan Project, with the best time to visit.
Things to do at Manhattan Project in August
The National Park Service tags 52 Manhattan Project activities for summer. Here are 8 of them. Each links to the park's own page for it.
- Oak Ridge: Enjoy the Community Swimming Pool · 1-4 hours
- Hanford: Attend a B Reactor Tour · 4 hours · reservation required
- Hanford: Enjoy a Pre-War Historic Sites Tour · 4 hours · reservation required
- Hanford: Enjoy Sacajawea Historical State Park · 2 hours
- Hanford: Join a Ranger Program · 1-3 hours · reservation required
- Hanford: Tour the Pasco Aviation Museum · 1-2 hours
- Hanford: Visit Sacajawea Interpretive Center · 2 hours · reservation required
- Los Alamos: Picnic at Ashley Pond · 30-90 minutes
Frequently Asked Questions
August averages a daytime high near 80°F and an overnight low around 55°F at Manhattan Project National Historical Park, with about 3.2 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 1.6 miles from the park, so conditions inside the park can differ, especially at other elevations.
August is busy at Manhattan Project National Historical Park (about 1.4× the average month). Our best-time score rates it "Fair" at 59/100. Our recommended month is May.
The busiest month is July and the quietest is January. August sits at about 1.4× the park's average, or 11% of annual visitation.
A typical August sees about 7,000 recreation visits at Manhattan Project National Historical Park, based on National Park Service monthly counts from 2016–2025.
Where to stay near Manhattan Project in August
Booking a August trip to Manhattan Project National Historical Park? Compare hotels, cabins and vacation rentals near the park with live August availability and prices.
Top-rated places to stay near Manhattan Project
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See the full ranking of the best national parks to visit in August.
Source: National Park Service Visitor Use Statistics (2016–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.