Lake Sunapee, NH

Today’s Forecast:

Today’s Report:

About Lake Sunapee

Lake Sunapee is a western New Hampshire destination for boating, paddling, beaches, state-park camping, shoreline towns, and nearby mountain recreation.

Make the Most of a Lake Sunapee Day

Use the calmest period for open water and check cold-water conditions well into early summer. Mountain clouds and gusts can reach the lake quickly, so keep a sheltered shore plan.

Weather Tips for Lake Sunapee

• Check temperature, wind, rain timing, and thunderstorm potential before choosing the day’s route.
• Wind, current, water temperature, waves, and lightning should guide water plans more than sunshine alone.
• Check overnight lows, wet ground, drainage, and the nearest substantial shelter before settling into camp.
• Spring mud, summer bugs, fall crowds, and winter ice can affect access even on a mild day.

Nearby Towns and Areas

This page can also be useful when planning outdoor time near:

• Sunapee Harbor
• Newbury
• New London
• Mount Sunapee State Park
• Georges Mills
• Lake Solitude
• Sugar River

Plan Around the Conditions

Use the forecast to choose the best version of a Lake Sunapee day. Match elevation, wind, storms, water conditions, trail surfaces, road access, temperature, and daylight to the activity that gives your group the safest and most comfortable plan.

7-Day Forecast for Lake Sunapee, NH

Lake Sunapee Weather by Season

Winter

Winter at Lake Sunapee brings snow, ice, wind chill, short daylight, and changing road access. Shaded trails, parking areas, and bridges can stay icy through mild spells. Check current facility and road status before departure.

Spring

Spring around Lake Sunapee is mud season, with snowmelt, soft trails, lingering high-elevation ice, and rising waterways. Cold water remains a serious factor even when the air feels warm. Black flies often become noticeable from late spring into early summer.

Summer

Summer at Lake Sunapee brings the warmest weather, humidity, mosquitoes, and afternoon thunderstorm potential. Morning commonly offers calmer water and a larger safety margin before storms. Carry water and use shade breaks during hot periods.

Fall

Fall is a popular season at Lake Sunapee, with cooler air, changing foliage, and generally comfortable outdoor conditions. Busy foliage weekends can affect roads, parking, and waterfront towns. Cold nights, early ice, and rapidly shortening daylight return late in the season.

Key Climate Data Points

• Annual average temperature: generally around 44–47°F around the lake towns, based on the relevant summit or surrounding regional context.
• Annual snowfall: commonly 60–80 inches; elevation and year-to-year storm tracks cause substantial variation.
• Warmest months: July and August are normally warmest, although high terrain and water exposure stay cooler.
• Coolest months: January and February are typically coldest, with wind chill often more important than temperature alone.
• Wettest season: late spring and summer are typically wettest.
• Driest season: winter is driest by rainfall but snow and ice continue.
• Best outdoor window: late June through September for boating and paddling, with fall strong for hiking.