word | | Climate |
| May | Holy See (Vatican City) | temperate; mild, rainy winters (September to May) with hot, dry summers (May to September) |
| May | Indian Ocean | northeast monsoon (December to April), southwest monsoon (June to October); tropical cyclones occur during May/June and October/November in the northern Indian Ocean and January/February in the southern Indian Ocean |
| May | Laos | tropical monsoon; rainy season (May to November); dry season (December to April) |
| May | Malawi | sub-tropical; rainy season (November to May); dry season (May to November) |
| May | Marshall Islands | tropical; hot and humid; wet season May to November; islands border typhoon belt |
| May | Mauritius | tropical, modified by southeast trade winds; warm, dry winter (May to November); hot, wet, humid summer (November to May) |
| May | Mayotte | tropical; marine; hot, humid, rainy season during northeastern monsoon (November to May); dry season is cooler (May to November) |
| May | Oman | dry desert; hot, humid along coast; hot, dry interior; strong southwest summer monsoon (May to September) in far south |
| May | Pacific Ocean | ... a dry season during the winter months, when dry winds blow from the Asian landmass back to the ocean; tropical cyclones (typhoons) may strike southeast and east Asia from May to December |
| May | Palau | Tropical; hot and humid; wet season May to November |
| May | Panama | tropical maritime; hot, humid, cloudy; prolonged rainy season (May to January), short dry season (January to May) |
| May | Papua New Guinea | tropical; northwest monsoon (December to March), southeast monsoon (May to October); slight seasonal temperature variation |
| May | Philippines | tropical marine; northeast monsoon (November to April); southwest monsoon (May to October) |
| May | Saint Kitts and Nevis | tropical, tempered by constant sea breezes; little seasonal temperature variation; rainy season (May to November) |