Choosing the best time for a wedding in London, Ontario usually comes down to a familiar Southwestern Ontario trade-off: long bright days versus heat, humidity and storm risk. The city gets its strongest outdoor conditions from late spring into early autumn, but the feel of the day changes a lot between a fresh May garden ceremony and a hot July celebration with guests looking for shade.
This report uses historical weather from 2016-2025 as a planning signal, not a promise. In London, that should be weighed alongside university calendars, summer road trips across Ontario, hotel demand around major Western University and Fanshawe events, and whether your venue can pivot quickly from lawn or terrace to a covered indoor setup.
June is the strongest historical month in this report for London, with 13.55 average daily sunshine hours, 1.85 average daily precipitation hours and an average daily maximum of 24.42°C. For many couples, that is a sweet spot: warm enough for outdoor ceremonies and cocktail hours, but usually less punishing than peak summer heat. Parks, estates and golf-club venues tend to look lush by then, and daylight lasts long enough for a later ceremony without sacrificing portraits. Even so, Southwestern Ontario weather can turn quickly, so a shaded backup area and a rain plan still matter.
Best Day to Get Married in London
The highest-ranked historical date here is 04 July, showing 15 sunshine hours, 0.5 precipitation hours and a maximum temperature of 28.25°C. That points to a very strong midsummer outdoor-wedding pattern rather than certainty for any future 4 July. The strongest Saturdays in the planning years are 04 July 2026, 10 July 2027 and 17 June 2028, all combining long daylight with relatively limited rain in the historical record. In practical terms, these are the kinds of dates that suit tented receptions, sunset portraits and larger guest lists, provided you also plan for heat, hydration and thunderstorms.
Before booking, check whether your chosen weekend overlaps with holiday traffic, university events or large downtown festivals that can tighten hotel supply and slow guest transport. In London, it is also worth confirming sunset timing, outdoor noise rules and whether your venue's indoor backup can hold the full guest count comfortably if a storm moves through.
Keep reading to view the best day to get married, hours of rain per day and average high temperature per day in London, Ontario, Canada for every month in 2026, 2027 and 2028: