April in Waterloo averages a daily high of 11.4°C with nights around 1°C. Expect roughly 10.5 wet days totalling 75.3mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Waterloo is May–September.
Based on ROSEVILLE, ON CA (13.6km), 1995–2024. 25 years of April data.