word | | Climate |
| 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) |
| May | Saint Lucia | tropical, moderated by northeast trade winds; dry season January to April, rainy season May to August |
| May | Saint Vincent and the Grenadines | tropical; little seasonal temperature variation; rainy season (May to November) |
| May | Samoa | tropical; rainy season (November to April), dry season (May to October) |
| May | Sao Tome and Principe | tropical; hot, humid; one rainy season (October to May) |
| May | Senegal | tropical; hot, humid; rainy season (May to November) has strong southeast winds; dry season (December to April) dominated by hot, dry, harmattan wind |
| May | Seychelles | tropical marine; humid; cooler season during southeast monsoon (late May to September); warmer season during northwest monsoon (March to May) |
| May | Sierra Leone | tropical; hot, humid; summer rainy season (May to December); winter dry season (December to April) |
| May | Somalia | ... desert; northeast monsoon (December to February), moderate temperatures in north and hot in south; southwest monsoon (May to October), torrid in the north and hot in the south, irregular rainfall, hot and ... |
| May | Thailand | tropical; rainy, warm, cloudy southwest monsoon (mid-May to September); dry, cool northeast monsoon (November to mid-March); southern isthmus always hot and humid |
| May | Tonga | tropical; modified by trade winds; warm season (December to May), cool season (May to December) |