Best time to visit Herbert Hoover National Historic Site
October is the best balance at Herbert Hoover National Historic Site: mild and dry for the park (an average high of 63°F), with busy crowds. August is busiest, with about 16,000 visitors. November is the quietest, with highs near 48°F.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
Month by month
- Station
- Iowa City, IA USC00134101
- Lat / lon
- 41.61, -91.50
- Elevation
- 640 ft
- From park center
- 8.9 mi
- Normals
- 1991–2020
- Visits
- 2023–2025
| Field | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Octbest | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High, °F | 29° | 34° | 48° | 62° | 72° | 81° | 84° | 82° | 76° | 63° | 48° | 34° | 60° |
| Low, °F | 12° | 16° | 27° | 37° | 49° | 59° | 63° | 60° | 52° | 40° | 28° | 18° | 38° |
| Precipitation, in | 1.1 | 1.4 | 2.3 | 3.9 | 5.0 | 5.5 | 4.6 | 4.3 | 3.5 | 3.0 | 2.3 | 1.6 | 38.5 |
| Snow, in | 7.6 | 7.5 | 3.2 | 0.5 | 0 | 0 | 0 | 0 | 0 | 0.4 | 1.1 | 7.2 | 27.5 |
| Daylight, h:mm | 9:28 | 10:32 | 11:48 | 13:16 | 14:30 | 15:11 | 14:55 | 13:51 | 12:25 | 11:01 | 9:46 | 9:10 | |
| Visitors, thousands | 6 | 7 | 10 | 9 | 11 | 12 | 13 | 16 | 13 | 9 | 8 | 7 | 121 |
| Crowds | Moderate | Moderate | Busy | Busy | Busy | Busy | Busy | Very busy | Very busy | Busy | Moderate | Moderate | |
| Weather | Cold | Cold | Cool | Mild, wet | Mild, wet | Hot | Hot | Hot | Mild, wet | Mild | Cool | Cold |
| Month | High °F | Low °F | Precip., in | Snow, in | Daylight | Visitors | Crowds | Weather |
|---|---|---|---|---|---|---|---|---|
| January | 29° | 12° | 1.1 | 7.6 | 9:28 | 5,800 | Moderate | Cold |
| February | 34° | 16° | 1.4 | 7.5 | 10:32 | 7,100 | Moderate | Cold |
| March | 48° | 27° | 2.3 | 3.2 | 11:48 | 9,800 | Busy | Cool |
| April | 62° | 37° | 3.9 | 0.5 | 13:16 | 9,000 | Busy | Mild, wet |
| May | 72° | 49° | 5.0 | 0 | 14:30 | 11,000 | Busy | Mild, wet |
| June | 81° | 59° | 5.5 | 0 | 15:11 | 12,000 | Busy | Hot |
| July | 84° | 63° | 4.6 | 0 | 14:55 | 13,000 | Busy | Hot |
| August | 82° | 60° | 4.3 | 0 | 13:51 | 16,000 | Very busy | Hot |
| September | 76° | 52° | 3.5 | 0 | 12:25 | 13,000 | Very busy | Mild, wet |
| Octoberbest | 63° | 40° | 3.0 | 0.4 | 11:01 | 9,400 | Busy | Mild |
| November | 48° | 28° | 2.3 | 1.1 | 9:46 | 8,400 | Moderate | Cool |
| December | 34° | 18° | 1.6 | 7.2 | 9:10 | 6,800 | Moderate | Cold |
| Year | 60° | 38° | 38.5 | 27.5 | 121,000 | |||
Year: average high and low, total precipitation and snowfall, total visitors. T = trace (under 0.05 in). – = not measured at this station. Updated .
- Hottest July, average high 84°F
- Coldest nights January, average low 12°F
- Source NOAA National Centers for Environmental Information; National Park Service
- Visitors a year about 121,000 (2023–2025 average)
- State Iowa
Closures, reservations and alerts: Herbert Hoover National Historic Site on nps.gov
Nearby
- Effigy Mounds National MonumentBest: Oct · Iowa
- Lincoln Home National Historic SiteBest: Sep · Illinois
- Gateway Arch National ParkBest: Mar, Oct and Nov · Missouri
- Indiana Dunes National ParkBest: Apr · Indiana