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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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Belleville, Ontario, sees four distinct seasons with warm, humid summers and cold, snowy winters. The live forecast above gives today’s conditions, but for planning, July and August are the warmest months, while January is the coldest, averaging around -8°C.
What is the best time to visit Belleville?
Late spring (May to June) and early autumn (September to October) offer the most comfortable weather for exploring the Bay of Quinte region. Summer highs reach about 26°C, but humidity can make it feel warmer. Winters are cold, with January lows near -14°C and significant snowfall, so pack a heavy coat and boots if visiting then.
What should I pack and when is value best?
For a summer trip, bring light layers, rain gear, and sunscreen. Winter visitors need a warm parka, insulated boots, and gloves. Value-conscious travellers and snowbirds often find April and October offer milder weather and lower accommodation rates. March break can still be chilly, with occasional snow and highs around 2°C.
Does Belleville get extreme weather?
Yes, Belleville can experience severe thunderstorms in summer and occasional ice storms or blizzards in winter. Check the weather warning page for alerts before travelling.
How accurate is the 30 day weather forecast for Belleville Ontario?
Long-range forecasts like a 30 day weather forecast for Belleville Ontario give general trends, not precise daily conditions. For reliable planning, use the live forecast above or check the weather network Belleville 14 days outlook.
Where can I find weather Belleville hourly or radar?
For weather Belleville hourly updates and weather Belleville radar, Environment and Climate Change Canada provides the most authoritative data. The live forecast above also refreshes regularly with current conditions.