May in Narva averages a daily high of 15.7°C with nights around 5.3°C. Expect roughly 10.3 wet days totalling 45.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Narva is June–August.
Based on NARVA, EN (4.6km), 1995–2024. 29 years of May data.