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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Scene Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
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Perth’s weather balances four distinct seasons: warm, pleasant summers; crisp, colourful autumns; cold, snowy winters; and a late spring that rewards travellers who wait until May. The live forecast above gives today’s conditions, but planning a visit means knowing the town’s seasonal rhythms.
What’s the best time to visit Perth, Ontario?
Late May through early October is the sweet spot for most travellers. July and August bring average highs around 26 °C, ideal for strolling the heritage downtown and boating on the Rideau Canal. For snowbirds and March-break families, February to early March offers reliable snow for skating on the canal and cross-country skiing at nearby Foley Mountain – just pack thermal layers and waterproof boots.
What should you pack for a trip to Perth?
Winter visitors need a heavy parka, insulated boots, gloves, and a hat; temperatures often drop to –15 °C at night. Summer calls for light layers, a rain jacket (thunderstorms are common), and sun protection. Spring and fall are changeable – a warm sweater and waterproof footwear are smart choices. Regardless of season, carry a reusable water bottle and sunscreen.
Does Perth get lake-effect snow?
Yes, occasional lake-effect squalls from Lake Ontario can add quick bursts of heavy snow, but the town is far enough inland that accumulations are lighter than in cities directly on the lake.
Is Perth humid in summer?
Humidity can make July and August feel muggy, especially after thunderstorms. The humidex often reaches the high 30s, so check the live forecast above before outdoor plans.
When do the leaves change colour in Perth?
Peak autumn colour usually runs from late September to mid-October. The Rideau Trail and local conservation areas are excellent spots for leaf peeping.
Sources
For more details on Canadian destinations, see our Canada weather hub or check Ottawa weather for conditions in the region.