Summit forecast for 1,945 ft · Belknap Range · Updated 3x daily
As of July 21, 2026
Mount Mack (1,945 ft) is currently 61°F (feels like 57°F) with clear sky and S winds at 10 mph, gusting to 21 mph. Today's freezing level is 13,189–14,370 ft. Trail conditions are rated Moderate.
Valley forecasts don't apply up high — temperatures drop about 3.6°F per 1,000 ft on Mount Mack.
| Elevation | Temp Range | Max Wind | Wind Chill (Low) |
|---|---|---|---|
| Summit 1,945 ft | 62° – 72°F | 29 mph | 62°F |
| Trailhead 2,000 ft | 62° – 71°F | 30 mph | 62°F |
Freezing level today: 13,189–14,370 ft
~3.6°F drop per 1,000ft
Tap a day header to expand to 3hr or hourly detail
Today Jul 21 | Tomorrow Jul 22 | Thursday Jul 23 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| AM | PM | night | AM | PM | night | AM | PM | night | |
| Temperature & Wind | |||||||||
| Weather | cloudy | rain | rain | cloudy | ptly cloudy | cloudy | sunny | sunny | sunny |
| Temp °F hi / lo | 66° 62° | 72° 65° | 68° 64° | 69° 64° | 72° 70° | 69° 52° | 57° 51° | 68° 59° | 68° 63° |
| Chill °F | — | — | — | — | — | — | — | — | — |
| Wind mph | 24 | 29 | 28 | 23 | 23 | 26 | 25 | 17 | 14 |
| Gust mph est. | — | — | — | 28 | — | — | — | — | — |
| Storm risk | — | — | — | mod | mod | — | — | — | — |
| Precipitation | |||||||||
| Precip in (rain/snow) | - | 0.2 | 0.2 | - | - | - | - | - | - |
| Freezing ft | 13,859 ft | 13,436 ft | 10,337 ft | ||||||
| Conditions | |||||||||
| Cloud cover | 100% | 100% | 100% | 100% | 69% | 100% | - | 5% | 5% |
| Vis mi | clear | 2 | <0.1 | 8 | clear | clear | clear | clear | clear |
| UV | 4 | 7 | — | 5 | 7 | — | 6 | 7 | — |
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| Elevation | Today Jul 21 | Tomorrow Jul 22 | Thursday Jul 23 |
|---|---|---|---|
| lo/hi °F · wind mph & dir · chill °F | |||
| Summit 1,945 ft | 62/66° 24 | 64/69° 23 | 51/57° 25 |
| Trailhead 2,000 ft | 62/65° 24 | 64/68° 24 | 51/56° 26 |
4 more days of forecast — plan around the weather window, not just tomorrow.
Conditions synthesized from: NWS Higher Summits Forecast, NOAA Open-Meteo, Mount Washington Observatory, NETC Trip Reports, NOHRSC Snow Depth, Mt. Washington Avalanche Center, USGS Stream Levels, OpenWeather Air Quality.
AI-generated from public data. Always verify conditions before heading out — backcountry weather can change quickly.
As of July 21, 2026: Mount Mack (1,945 ft) is currently 61°F (feels like 57°F) with clear sky and S winds at 10 mph, gusting to 21 mph. Today's freezing level is 13,189–14,370 ft. Trail conditions are rated Moderate.
Temperatures drop roughly 3.6°F per 1,000 ft of elevation on Mount Mack. Today the trailhead (2,000 ft) tops out around 71°F while the summit (1,945 ft) reaches about 72°F, with a wind chill as low as 62°F.
Winds at the summit of Mount Mack are forecast to reach 29 mph today. Above treeline there is no shelter from wind — plan layers around wind chill, not air temperature.
Today's freezing level (13,189–14,370 ft) is above the 1,945 ft summit of Mount Mack, so the full route should stay above freezing.