Summit forecast for 3,340 ft · Sandwich Range · Updated 3x daily
As of September 4, 2026 at 1:20 PM ET
Middle Sister (3,340 ft) is currently 65°F (feels like 64°F) with clear sky and NW winds at 11 mph, gusting to 17 mph. Today's freezing level is 10,564–13,714 ft. Expect the summit to run about 6°F colder than the trailhead. Trail conditions are rated Good.
Valley forecasts don't apply up high — temperatures drop about 4.0°F per 1,000 ft on Middle Sister.
| Elevation | Temp Range | Max Wind | Wind Chill (Low) |
|---|---|---|---|
| Summit 3,340 ft | 58° – 63°F | 24 mph | 58°F |
| Trailhead 2,000 ft | 63° – 69°F | 18 mph | 63°F |
Freezing level today: 10,564–13,714 ft
~4°F drop per 1,000ft
Tap a day header to expand to 3hr or hourly detail
Today Sep 4 | Tomorrow Sep 5 | Sunday Sep 6 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| AM | PM | night | AM | PM | night | AM | PM | night | |
| Temperature & Wind | |||||||||
| Weather | fog | ptly cloudy | ptly cloudy | drizzle | rain | ptly cloudy | drizzle | cloudy | cloudy |
| Temp °F hi / lo | 61° 59° | 63° 61° | 60° 56° | 55° 53° | 53° 51° | 51° 48° | 51° 49° | 56° 53° | 52° 52° |
| Chill °F | — | — | — | — | — | 40° | 43° | — | — |
| Wind mph | 17 | 22 | 24 | 17 | 22 | 26 | 17 | 19 | 15 |
| Gust mph est. | 27 | 31 | 38 | 27 | 31 | 35 | 21 | — | — |
| Storm risk | mod | — | — | — | — | — | — | — | — |
| Precipitation | |||||||||
| Precip in (rain/snow) | - | - | - | - | 0.3 | - | - | - | - |
| Freezing ft | 11,301 ft | 9,630 ft | 8,218 ft | ||||||
| Conditions | |||||||||
| Cloud cover | 27% | 63% | 65% | 100% | 100% | 78% | 90% | 100% | 100% |
| Vis mi | 0.4 | clear | 9 | 8 | 0.1 | 9 | clear | clear | clear |
| UV | 5 | 6 | — | 4 | 4 | — | 5 | 6 | — |
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| Elevation | Today Sep 4 | Tomorrow Sep 5 | Sunday Sep 6 |
|---|---|---|---|
| lo/hi °F · wind mph & dir · chill °F | |||
| Summit 3,340 ft | 59/61° 17 | 53/55° 17 | 49/51° 17 |
| 3,300 ft | 59/61° 17 | 53/55° 17 | 49/51° 17 |
| 2,500 ft | 62/64° 13 | 56/58° 14 | 51/56° 16 |
| Trailhead 2,000 ft | 63/66° 9 | 58/60° 12 | 52/58° 14 |
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 September 4, 2026 at 1:20 PM ET: Middle Sister (3,340 ft) is currently 65°F (feels like 64°F) with clear sky and NW winds at 11 mph, gusting to 17 mph. Today's freezing level is 10,564–13,714 ft. Expect the summit to run about 6°F colder than the trailhead. Trail conditions are rated Good.
Temperatures drop roughly 4.0°F per 1,000 ft of elevation on Middle Sister. Today the trailhead (2,000 ft) tops out around 69°F while the summit (3,340 ft) reaches about 63°F, with a wind chill as low as 58°F.
Winds at the summit of Middle Sister are forecast to reach 24 mph today. Above treeline there is no shelter from wind — plan layers around wind chill, not air temperature.
Today's freezing level (10,564–13,714 ft) is above the 3,340 ft summit of Middle Sister, so the full route should stay above freezing.