Montevideo weather in September 2026
Expect daytime maximum temperatures of 18°C in Montevideo, Uruguay in September based on long-term weather averages. There are 7 hours of sunshine per day on average with typically 75 mm of rainfall in the month.
- 18°C max day temperature
18 - 7 hours of sunshine per day
- 9 days with some rainfall
9 - 9°C min night temperature
9 - 12 hours of daylight per day
12 - No heat & humidity
0 - 75 mm of monthly rainfall
75 - 6 (High) UV index
6 - 13°C sea temperature
13
