The highest day temperature in September 2025 was 76°F. The lowest night temperature was 39°F. The average values for day and night temperatures during September were 63.2°F и 51.7°F respectivly.

The average sea surface temperature in September 2025 for Montevideo was 59.7°F. The maximum and minimum values were 56.6°F and 63.8°F respectively.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Montevideo is 2.7 in.

The average wind speed in September is 10.4 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Montevideo in September is 7.7 hours.