April in Lethbridge averages a daily high of 12.3°C with nights around -0.8°C. Expect roughly 5.7 wet days totalling 16.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Lethbridge is July–September.
Based on LETHBRIDGE CDA, AB CA (3.7km), 1995–2024. 29 years of April data.