Thousand Islands
Today’s Forecast:
Today’s Report:
Boating
Use Caution for boating. High near 80°F. Low rain risk (24%). Light wind (8 mph). Slight chance of thunderstorms.
- Temp: Favorable conditions
- Rain: Favorable conditions
- Wind: Favorable conditions
- Thunderstorm: Marginal weather factor
Paddling
Use Caution for paddling. High near 80°F. Risk of rain later today (24%). Light wind (8 mph). Slight chance of thunderstorms.
- Temp: Favorable conditions
- Rain: Marginal weather factor
- Wind: Favorable conditions
- Thunderstorm: Marginal weather factor
Camping
Use Caution for camping. High near 80°F. Low rain risk (24%). Light wind (8 mph). Slight chance of thunderstorms.
- Temp: Marginal weather factor
- Rain: Favorable conditions
- Wind: Favorable conditions
- Thunderstorm: Marginal weather factor
Outdoor Events / Activities
Use Caution for outdoor events / activities. High near 80°F. Risk of rain later today (24%). Light wind (8 mph). Slight chance of thunderstorms.
- Temp: Favorable conditions
- Rain: Marginal weather factor
- Wind: Favorable conditions
- Thunderstorm: Marginal weather factor
About Thousand Islands
Thousand Islands is a New York destination for island-hopping, boating, paddling, campgrounds, and riverfront events.
Make the Most of a Thousand Islands Day
Match the route, launch, facility, or turnaround time to precipitation, wind, temperature, visibility, water conditions, snow or ice, and seasonal access. Keep a shorter or more sheltered alternative ready.
Weather Tips for Thousand Islands
- Check official access notices, alerts, trail or road conditions, and local forecasts before leaving.
- Check wind, waves, current, water temperature, ice reports, and lightning risk before launching or stepping onto frozen water; no forecast alone proves that ice is safe.
- Bring layers, water, navigation, sun protection, and traction or flotation appropriate to the season and activity.
- Allow extra time for traffic, limited winter daylight, lake-effect snow, freeze-thaw mud, and seasonal facility schedules.
Nearby Towns and Areas
This page can also be useful when planning outdoor time near:
- Alexandria Bay
- Clayton
- Cape Vincent
- Grindstone Island
- Boldt Castle
- St. Lawrence River
Plan Around the Conditions
Choose the safest version of a Thousand Islands day by matching the activity to current wind, precipitation, temperature, visibility, water or snow conditions, access, and daylight.
7-Day Forecast for Thousand Islands, NY
Thousand Islands Weather by Season
Winter
Winter at Thousand Islands brings cold, shorter daylight, and periodic snow or ice. Cold water, wind, waves, and rapidly changing shore conditions remain serious hazards.
Spring
Spring is changeable, with rain, mud, snowmelt, rising water, and lingering ice in shaded or elevated terrain. Lower routes and developed facilities generally become usable before exposed, backcountry, or high-elevation areas.
Summer
Summer usually provides the broadest access, but heat, humidity, thunderstorms, crowds, and occasional wildfire smoke can alter plans. Start exposed outings early and keep a weather-safe turnaround point.
Fall
Fall brings cooler air, foliage crowds, shorter daylight, and increasing wind. Early snow or ice can reach northern and elevated areas while lower valleys and coastal destinations remain milder.
Key Climate Data Points
- Annual average temperature: around 43–47°F, using the relevant local and elevation context.
- Annual snowfall: commonly 55–90 inches, with wind and local lake-effect variation.
- Warmest months: July and August are normally warmest.
- Coolest months: January is typically coolest, with February similarly cold in northern and elevated areas.
- Wettest season: precipitation is distributed through the year, with late spring through summer often wettest from rain and thunderstorms.
- Driest season: no season is reliably dry statewide; early fall often provides the most stable outdoor windows.
- Best outdoor window: June through October for warm-season access, with midwinter best only where established winter recreation is supported.