May in Nizwá averages a daily high of 41.2°C with nights around 26.1°C. Expect roughly 3 wet days totalling 5.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Nizwá is December–January.
Based on NIZWA, MU (7.6km), 1995–2024. 15 years of May data.