April in Semey averages a daily high of 14.9°C with nights around 0.5°C. Expect roughly 6.9 wet days totalling 21.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Semey is August–September.
Based on SEMEJ, KZ (3.6km), 1995–2024. 30 years of April data.