Where to Go in September

September across 279 indexable cities in this dataset: 148 average above 24°C, 106 sit between 15°C and 24°C, and 25 sit at 15°C or below. The hottest monthly average is Basrah at 35.1°C; the coldest is Reykjavík at 7.9°C.

Rain that month spans 0 mm in Riyadh to 441 mm in Conakry. The sample mean temperature is 23.4°C and the sample mean rainfall is 100 mm.

Hemisphere and monsoon in September

Northern-hemisphere cities average 23.7°C in September; southern-hemisphere cities average 21.9°C. That split is the usual summer/winter reversal, not a scoring trick.

Monsoon-type cities that are inside their wet season this month include Kakamega, Mbuji-Mayi, Kananga, Kampala, Lahore, Gujranwala, and 56 more. 36 monsoon-type cities are on the dry side of their year in September.