Montevideo weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: October – April
What is the weather like in Montevideo in September?
In September, Montevideo is mild: daytime highs average 17 °C, and nights cool down to about 10 °C. The sea averages 13.8 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain falls on about 8 days, adding up to 82 mm. All in all, September is a good month for a holiday in Montevideo.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 67 | 76 | 82 |
| Day | 16° | 17° | 20° |
| Night | 9° | 10° | 12° |
| Sea | 12° | 14° | 17° |
| Sun | 5 h | 6 h | 7 h |
| Rain days | 8 | 8 | 9 |
More details for September
- Daylight
- 11 h 49 min06:45 – 18:35
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 23 km/haverage daily peakAll months
- Cloud cover
- 56 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC−3America/Montevideo
How the score comes together
- Temperatureweight 50 %87 %
- Sunshineweight 20 %55 %
- Few rainy daysweight 30 %72 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
Montevideo in September: quick answers
Is Montevideo hot in September?
No. In September, Montevideo is mild: daytime highs average 17 °C and nights drop to about 10 °C.
Can you swim in Montevideo in September?
Only if you don't mind cold water: in September the sea averages just 13.8 °C. Comfortable swimming is possible from December to March.
Does it rain much in Montevideo in September?
Rain falls on about 8 days, adding up to 82 mm.
Montevideo month by month
The whole year in MontevideoAll destinations: UruguayWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences