Best time to visit Antietam National Battlefield
October and November are the best balance at Antietam National Battlefield: mild and dry for the park (average highs 56° to 67°F), with busy crowds. September is busiest, with about 21,000 visitors. January is the quietest, with highs near 41°F.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
Month by month
- Station
- Sharpsburg 5 S, MD USC00188207
- Lat / lon
- 39.40, -77.72
- Elevation
- 400 ft
- From park center
- 4.5 mi
- Normals
- 1991–2020
- Visits
- 2023–2025
| Field | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Octbest | Novbest | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High, °F | 41° | 44° | 53° | 65° | 74° | 82° | 86° | 85° | 78° | 67° | 56° | 45° | 65° |
| Low, °F | 21° | 23° | 29° | 39° | 49° | 58° | 62° | 61° | 54° | 42° | 32° | 25° | 41° |
| Precipitation, in | 3.1 | 2.4 | 3.7 | 3.6 | 4.6 | 4.2 | 4.3 | 3.3 | 4.4 | 3.4 | 3.1 | 3.5 | 43.5 |
| Snow, in | – | – | – | – | – | – | – | – | – | – | – | – | – |
| Daylight, h:mm | 9:40 | 10:39 | 11:49 | 13:11 | 14:19 | 14:56 | 14:42 | 13:43 | 12:24 | 11:05 | 9:57 | 9:24 | |
| Visitors, thousands | 3 | 4 | 9 | 14 | 18 | 20 | 17 | 17 | 21 | 15 | 12 | 21 | 171 |
| Crowds | Quiet | Quiet | Moderate | Busy | Very busy | Very busy | Very busy | Very busy | Very busy | Busy | Busy | Very busy | |
| Weather | Cool | Cool | Cool | Mild, wet | Mild, wet | Hot | Hot | Hot | Mild, wet | Mild | Mild | Cool |
| Month | High °F | Low °F | Precip., in | Snow, in | Daylight | Visitors | Crowds | Weather |
|---|---|---|---|---|---|---|---|---|
| January | 41° | 21° | 3.1 | – | 9:40 | 2,600 | Quiet | Cool |
| February | 44° | 23° | 2.4 | – | 10:39 | 4,400 | Quiet | Cool |
| March | 53° | 29° | 3.7 | – | 11:49 | 9,300 | Moderate | Cool |
| April | 65° | 39° | 3.6 | – | 13:11 | 14,000 | Busy | Mild, wet |
| May | 74° | 49° | 4.6 | – | 14:19 | 18,000 | Very busy | Mild, wet |
| June | 82° | 58° | 4.2 | – | 14:56 | 20,000 | Very busy | Hot |
| July | 86° | 62° | 4.3 | – | 14:42 | 17,000 | Very busy | Hot |
| August | 85° | 61° | 3.3 | – | 13:43 | 17,000 | Very busy | Hot |
| September | 78° | 54° | 4.4 | – | 12:24 | 21,000 | Very busy | Mild, wet |
| Octoberbest | 67° | 42° | 3.4 | – | 11:05 | 15,000 | Busy | Mild |
| Novemberbest | 56° | 32° | 3.1 | – | 9:57 | 12,000 | Busy | Mild |
| December | 45° | 25° | 3.5 | – | 9:24 | 21,000 | Very busy | Cool |
| Year | 65° | 41° | 43.5 | – | 171,000 | |||
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 86°F
- Coldest nights January, average low 21°F
- Source NOAA National Centers for Environmental Information; National Park Service
- Visitors a year about 171,000 (2023–2025 average)
- State Maryland
Closures, reservations and alerts: Antietam National Battlefield on nps.gov
Nearby
- Harpers Ferry National Historical ParkBest: Oct and Nov · West Virginia
- Chesapeake and Ohio Canal National Historical ParkBest: Oct and Nov · Maryland and Washington, DC
- Catoctin Mountain ParkBest: Apr · Maryland
- Monocacy National BattlefieldBest: Apr, Oct and Nov · Maryland