Summit forecast for 3,565 ft · Mahoosuc Range · Updated 3x daily
As of August 16, 2026 at 8:20 PM ET
Mount Success (3,565 ft) is currently 55°F (feels like 50°F) with clear sky and SE winds at 9 mph, gusting to 16 mph. Today's freezing level is 13,025–14,829 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 3.4°F per 1,000 ft on Mount Success.
| Elevation | Temp Range | Max Wind | Wind Chill (Low) |
|---|---|---|---|
| Summit 3,565 ft | 51° – 59°F | 23 mph | 51°F |
| Trailhead 2,000 ft | 52° – 66°F | 15 mph | 52°F |
Freezing level today: 13,025–14,829 ft
~3.4°F drop per 1,000ft
Tap a day header to expand to 3hr or hourly detail
Sunday Aug 16 | Today Aug 17 | Tomorrow Aug 18 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| AM | PM | night | AM | PM | night | AM | PM | night | |
| Temperature & Wind | |||||||||
| Weather | fog | cloudy | drizzle | drizzle | cloudy | fog | drizzle | drizzle | drizzle |
| Temp °F hi / lo | 52° 51° | 59° 54° | 59° 57° | 59° 58° | 62° 59° | 61° 59° | 59° 56° | 65° 56° | 63° 60° |
| Chill °F | — | — | — | — | — | — | — | — | — |
| Wind mph | 12 | 17 | 25 | 24 | 14 | 9 | 13 | 12 | 8 |
| Gust mph est. | 19 | 27 | 38 | 36 | 20 | 14 | 21 | 19 | — |
| Storm risk | — | — | — | — | mod | — | — | high | — |
| Precipitation | |||||||||
| Precip in (rain/snow) | - | - | 0.0 | 0.1 | - | - | - | 0.2 | - |
| Freezing ft | 13,895 ft | 14,424 ft | 14,397 ft | ||||||
| Conditions | |||||||||
| Cloud cover | 99% | 90% | 100% | 100% | 100% | 100% | 100% | 100% | 100% |
| Vis mi | 0.2 | clear | <0.1 | <0.1 | 8 | <0.1 | <0.1 | 10 | clear |
| UV | 5 | 7 | — | 3 | 2 | — | 4 | 6 | — |
Tap a day header to expand AM/PM/Night detail
| Elevation | Sunday Aug 16 | Today Aug 17 | Tomorrow Aug 18 |
|---|---|---|---|
| lo/hi °F · wind mph & dir · chill °F | |||
| Summit 3,565 ft | 51/52° 12 | 58/59° 24 | 56/59° 13 |
| 3,300 ft | 51/53° 12 | 59/60° 23 | 57/60° 14 |
| 2,500 ft | 52/57° 10 | 61/63° 17 | 60/61° 13 |
| Trailhead 2,000 ft | 52/59° 8 | 62/65° 13 | 62/63° 11 |
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 August 16, 2026 at 8:20 PM ET: Mount Success (3,565 ft) is currently 55°F (feels like 50°F) with clear sky and SE winds at 9 mph, gusting to 16 mph. Today's freezing level is 13,025–14,829 ft. Expect the summit to run about 7°F colder than the trailhead. Trail conditions are rated Moderate.
Temperatures drop roughly 3.4°F per 1,000 ft of elevation on Mount Success. Today the trailhead (2,000 ft) tops out around 66°F while the summit (3,565 ft) reaches about 59°F, with a wind chill as low as 51°F.
Winds at the summit of Mount Success are forecast to reach 23 mph today. Above treeline there is no shelter from wind — plan layers around wind chill, not air temperature.
Today's freezing level (13,025–14,829 ft) is above the 3,565 ft summit of Mount Success, so the full route should stay above freezing.