Summit forecast for 3,565 ft · Mahoosuc Range · Updated 3x daily
As of July 21, 2026
Mount Success (3,565 ft) is currently 57°F (feels like 52°F) with overcast and SSE winds at 10 mph, gusting to 21 mph. Today's freezing level is 12,631–14,075 ft. Expect the summit to run about 7°F colder than the trailhead. Trail conditions are rated Moderate.
Valley forecasts don't apply up high — temperatures drop about 3.2°F per 1,000 ft on Mount Success.
| Elevation | Temp Range | Max Wind | Wind Chill (Low) |
|---|---|---|---|
| Summit 3,565 ft | 58° – 62°F | 38 mph | 58°F |
| Trailhead 2,000 ft | 62° – 69°F | 24 mph | 62°F |
Freezing level today: 12,631–14,075 ft
~3.2°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 | sunny | cloudy | cloudy | cloudy | sunny |
| Temp °F hi / lo | 59° 59° | 62° 59° | 61° 59° | 61° 59° | 65° 62° | 58° 43° | 47° 42° | 60° 50° | 57° 56° |
| Chill °F | — | — | — | — | — | 33° | 30° | 42° | — |
| Wind mph | 26 | 36 | 38 | 30 | 27 | 28 | 35 | 28 | 20 |
| Gust mph est. | 42 | 58 | 61 | 48 | 43 | 45 | 47 | 32 | — |
| Storm risk | — | — | — | mod | mod | — | — | — | — |
| Precipitation | |||||||||
| Precip in (rain/snow) | - | 0.2 | 0.5 | - | - | - | - | - | - |
| Freezing ft | 13,578 ft | 13,131 ft | 9,181 ft | ||||||
| Conditions | |||||||||
| Cloud cover | 100% | 100% | 100% | 100% | 7% | 84% | 100% | 100% | - |
| Vis mi | clear | 2 | <0.1 | 9 | clear | clear | clear | clear | clear |
| UV | 5 | 7 | — | 5 | 7 | — | 4 | 7 | — |
Tap a day header to expand AM/PM/Night detail
| Elevation | Today Jul 21 | Tomorrow Jul 22 | Thursday Jul 23 |
|---|---|---|---|
| lo/hi °F · wind mph & dir · chill °F | |||
| Summit 3,565 ft | 59/59° 26 | 59/61° 30 | 42/47° 35 |
| 3,300 ft | 60/60° 25 | 60/62° 28 | 43/48° 34 |
| 2,500 ft | 62/64° 20 | 63/66° 17 | 47/53° 31 |
| Trailhead 2,000 ft | 63/66° 17 | 65/68° 14 | 49/55° 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 Success (3,565 ft) is currently 57°F (feels like 52°F) with overcast and SSE winds at 10 mph, gusting to 21 mph. Today's freezing level is 12,631–14,075 ft. Expect the summit to run about 7°F colder than the trailhead. Trail conditions are rated Moderate.
Temperatures drop roughly 3.2°F per 1,000 ft of elevation on Mount Success. Today the trailhead (2,000 ft) tops out around 69°F while the summit (3,565 ft) reaches about 62°F, with a wind chill as low as 58°F.
Winds at the summit of Mount Success are forecast to reach 38 mph today. Above treeline there is no shelter from wind — plan layers around wind chill, not air temperature.
Today's freezing level (12,631–14,075 ft) is above the 3,565 ft summit of Mount Success, so the full route should stay above freezing.