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Janzbran CC BY-SA 4.0 Wikimedia Commons

Treasure Island (Ontario)

Island

A small Ontario island in the Great Lakes region frequented by boaters and anglers; seasonal cottages, rocky shoreline and direct access to boating routes shape most visits.

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Treasure Island (Ontario) essentials

Country: Canada
Driest months: Feb-Apr
Pay in: Dollar ($)
Language: French, English

Treasure Island (Ontario) at a Glance

When to Go

Best Time to Visit Treasure Island (Ontario)

Visit in summer (June-September) for reliable access, warm weather and boating around the island.

Summer (boating season, best)
June-September · 15-25 °C
Warm weather and calm waters ideal for boating, swimming and camping - busiest and most accessible period.
Shoulder (cooler, quieter)
May, October · 5-15 °C
Fewer visitors and cooler temperatures; some facilities or services may be limited outside high season.
Winter (inaccessible)
November-April · −20-0 °C (varies)
Lake and waterways freeze in many years and access by boat is not possible; recreational use is minimal.

Weather & Climate near Treasure Island (Ontario)

Climate

Treasure Island (Ontario)'s climate is classified as Warm-Summer Continental - Warm-Summer Continental climate with mild summers (peaking in July) and freezing winters (coldest in January). Temperatures range from -14°C to 23°C. Moderate rainfall (868 mm/year).

Air Quality: AQI 18 Good
Temperature & Rainfall
Temperature Range
23°
Warmest Month
-14°
Coldest Month
Monthly Conditions
Month Comfort Temp Feels Rain Sky Humidity Wind UV Daylight
January - -14° - -5° -16° 70 mm - - 4.8 m/s - -
February - -13° - -4° -15° 46 mm - - 4.5 m/s - -
March - -8° - 1° -9° 56 mm - - 4.4 m/s - -
April - -1° - 8° 0° 66 mm - - 4.4 m/s - -
May - 5° - 15° 10° 72 mm - - 3.9 m/s - -
June - 10° - 20° 15° 64 mm - - 3.6 m/s - -
July - 14° - 23° 19° 58 mm - - 3.4 m/s - -
August - 14° - 23° 18° 73 mm - - 3.5 m/s - -
September - 11° - 18° 15° 92 mm - - 4.0 m/s - -
October - 5° - 12° 6° 97 mm - - 4.6 m/s - -
November - -1° - 5° -2° 91 mm - - 5.1 m/s - -
December - -8° - -1° -11° 83 mm - - 4.9 m/s - -