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Thousand Islands

Island Group · Ontario, 🇨🇦 Canada
Area 262 km²
Time zone America/Toronto, America/New_York
Thousand Islands

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Thousand Islands Essentials

The Thousand Islands region spans the St. Lawrence River between New York and Ontario, characterized by historic landmarks and extensive parklands. This collection features Boldt Castle, a 120-room Rhineland-style mansion on Heart Island, and the 1000 Islands Tower, which provides panoramic views from 400 feet above the river. Natural sites include Wellesley Island State Park, offering over 2,600 acres of protected landscape, and the solar-powered Sunken Rock Light. Maritime exploration is central to the area, accessible via Wolfe Island’s ferry links and regional boat tours.

8 places

Thousand Islands — Map

Thousand Islands — Map

Climate & when to visit

Best time to visit: June, July, August, September

Select a month

Typical weather in January

Poor
  • -3° (feels like -7°) · extremes -23°–6°
  • -10° at night
  • 12 rainy days
  • 4 sunny days
  • 3 hours of sunshine per day
  • Dry air
  • Calm winds
  • 2°C · too cold to swim
  • UV index 1 · low

Typical weather in February

Poor
  • -1° (feels like -6°) · extremes -19°–7°
  • -10° at night
  • 11 rainy days
  • 7 sunny days
  • 4 hours of sunshine per day
  • Dry air
  • Calm winds
  • 1°C · too cold to swim
  • UV index 2 · low

Typical weather in March

Poor
  • 4° (feels like -1°) · extremes -15°–13°
  • -5° at night
  • 12 rainy days
  • 12 sunny days
  • 6 hours of sunshine per day
  • Dry air
  • Calm winds
  • 1°C · too cold to swim
  • UV index 3 · moderate

Typical weather in April

Poor
  • 11° (feels like 8°) · extremes -4°–20°
  • 2° at night
  • 13 rainy days
  • 11 sunny days
  • 7 hours of sunshine per day
  • Dry air
  • Calm winds
  • 3°C · too cold to swim
  • UV index 4 · moderate

Typical weather in May

Good
  • 18° (feels like 16°) · extremes 3°–26°
  • 9° at night
  • 12 rainy days
  • 11 sunny days
  • 8 hours of sunshine per day
  • Dry air
  • Calm winds
  • 9°C · too cold to swim
  • UV index 6 · high

Typical weather in June

Great
  • 23° · extremes 9°–29°
  • 15° at night
  • 13 rainy days
  • 11 sunny days
  • 8 hours of sunshine per day
  • Comfortable humidity
  • Calm winds
  • 16°C · too cold to swim
  • UV index 6 · high

Typical weather in July

Great
  • 26° (feels like 27°) · extremes 14°–31°
  • 18° at night
  • 13 rainy days
  • 12 sunny days
  • 9 hours of sunshine per day
  • Humid air
  • Calm winds
  • 22°C · cool for a dip
  • UV index 7 · high

Typical weather in August

Great
  • 25° (feels like 26°) · extremes 14°–30°
  • 18° at night
  • 12 rainy days
  • 12 sunny days
  • 8 hours of sunshine per day
  • Humid air
  • Calm winds
  • 23°C · cool for a dip
  • UV index 6 · high

Typical weather in September

Great
  • 21° · extremes 9°–28°
  • 14° at night
  • 10 rainy days
  • 13 sunny days
  • 7 hours of sunshine per day
  • Comfortable humidity
  • Calm winds
  • 20°C · cool for a dip
  • UV index 5 · moderate

Typical weather in October

Fair
  • 14° (feels like 11°) · extremes 2°–22°
  • 8° at night
  • 13 rainy days
  • 8 sunny days
  • 5 hours of sunshine per day
  • Dry air
  • Calm winds
  • 15°C · too cold to swim
  • UV index 2 · low

Typical weather in November

Poor
  • 7° (feels like 3°) · extremes -5°–15°
  • 2° at night
  • 12 rainy days
  • 6 sunny days
  • 3 hours of sunshine per day
  • Dry air
  • Calm winds
  • 9°C · too cold to swim
  • UV index 1 · low

Typical weather in December

Poor
  • 1° (feels like -3°) · extremes -14°–9°
  • -4° at night
  • 14 rainy days
  • 3 sunny days
  • 2 hours of sunshine per day
  • Dry air
  • Calm winds
  • 5°C · too cold to swim
  • UV index 1 · low

Climate data: NASA POWER + Copernicus ERA5-Land and ERA5 · 1996–2025

Practical information

Currency
Canadian Dollar CAD $ · Card payments · Widely accepted
Emergency numbers
911
Electricity
Type A / Type B
120 V · 60 Hz
Languages
English, French
Tap water
Safe to drink
Driving side
Right
Calling code
+1
Learn more

Tours & Activities

Boldt Castle
Drive
1000 Islands Tower
Drive
Church of Saint Lawrence

Thousand Islands – Plan Your Days

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