Summit forecast for 4,140 ft · Sandwich · Updated 3x daily
As of August 16, 2026 at 8:20 PM ET
Middle Tripyramid (4,140 ft) is currently 55°F (feels like 51°F) with overcast and SSE winds at 10 mph, gusting to 20 mph. Today's freezing level is 13,189–15,092 ft. Expect the summit to run about 9°F colder than the trailhead. Trail conditions are rated Difficult.
Valley forecasts don't apply up high — temperatures drop about 3.2°F per 1,000 ft on Middle Tripyramid.
| Elevation | Temp Range | Max Wind | Wind Chill (Low) |
|---|---|---|---|
| Summit 4,140 ft | 49° – 57°F | 25 mph | 41°F |
| Treeline 4,000 ft | 49° – 57°F | 25 mph | 41°F |
| Trailhead 2,000 ft | 53° – 66°F | 11 mph | 53°F |
Freezing level today: 13,189–15,092 ft
~3.2°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 | rain | rain | fog | fog | fog | drizzle | drizzle |
| Temp °F hi / lo | 51° 49° | 57° 52° | 57° 56° | 57° 56° | 61° 57° | 61° 59° | 58° 56° | 64° 57° | 61° 59° |
| Chill °F | 44° | — | — | — | — | — | — | — | — |
| Wind mph | 14 | 17 | 33 | 30 | 21 | 7 | 10 | 8 | 7 |
| Gust mph est. | 22 | 27 | 53 | 48 | 34 | 11 | — | — | — |
| Storm risk | — | — | — | — | — | — | — | mod | — |
| Precipitation | |||||||||
| Precip in (rain/snow) | - | - | 0.2 | 0.4 | - | - | - | 0.1 | - |
| Freezing ft | 14,412 ft | 14,642 ft | 14,589 ft | ||||||
| Conditions | |||||||||
| Cloud cover | 10% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% |
| Vis mi | 0.2 | 9 | <0.1 | <0.1 | <0.1 | <0.1 | 0.2 | clear | clear |
| UV | 5 | 7 | — | 0 | 2 | — | 4 | 6 | — |
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| Elevation | Sunday Aug 16 | Today Aug 17 | Tomorrow Aug 18 |
|---|---|---|---|
| lo/hi °F · wind mph & dir · chill °F | |||
| Summit 4,140 ft | 49/51° 14 | 56/57° 30 | 56/58° 10 |
| 4,100 ft | 49/51° 14 | 56/57° 30 | 56/58° 10 |
| 3,300 ft | 51/53° 14 | 58/58° 27 | 59/61° 11 |
| 2,500 ft | 52/57° 8 | 60/60° 19 | 62/63° 10 |
| Trailhead 2,000 ft | 53/59° 7 | 61/62° 15 | 64/65° 8 |
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: Middle Tripyramid (4,140 ft) is currently 55°F (feels like 51°F) with overcast and SSE winds at 10 mph, gusting to 20 mph. Today's freezing level is 13,189–15,092 ft. Expect the summit to run about 9°F colder than the trailhead. Trail conditions are rated Difficult.
Temperatures drop roughly 3.2°F per 1,000 ft of elevation on Middle Tripyramid. Today the trailhead (2,000 ft) tops out around 66°F while the summit (4,140 ft) reaches about 57°F, with a wind chill as low as 41°F.
Winds at the summit of Middle Tripyramid are forecast to reach 25 mph today, with 25 mph at treeline. Above treeline there is no shelter from wind — plan layers around wind chill, not air temperature.
Today's freezing level (13,189–15,092 ft) is above the 4,140 ft summit of Middle Tripyramid, so the full route should stay above freezing.