September weather forecast and climate
Montevideo, Uruguay

Beautiful lawns and palm trees in the independence square outside the Centrally placed Salvo Palace in Montevideo, Uruguay
Beautiful lawns and palm trees in the independence square outside the Centrally placed Salvo Palace in Montevideo, Uruguay
Spring arrives to Montevideo in September, and the weather is mild and dry. The climate is fabulous for boating, sailing and all cruising options that are available from spring. It is also a time to watch out for the high-speed winds that blow from the north-west, as they do not face any natural barriers.
With amenable daytime temperatures at 17.8°C (64°F) and the days getting longer with adequate sunshine, it is a period worth a visit to Montevideo.
Average temperature in September - Montevideo, Uruguay
  • Average high temperature in September: 18°C

The warmest month (with the highest average high temperature) is January (28.4°C).
The month with the lowest average high temperature is July (15°C).

  • Average low temperature in September: 9.1°C

The month with the highest average low temperature is January (18°C).
The coldest month (with the lowest average low temperature) is July (7.2°C).

Average humidity in September - Montevideo, Uruguay
  • Average humidity in September: 74%

The month with the highest relative humidity is June (82%).
The month with the lowest relative humidity is December (67%).

Average rainfall in September - Montevideo, Uruguay
  • Average rainfall in September: 93.9mm

The wettest month (with the highest rainfall) is October (108.5mm).
The driest month (with the lowest rainfall) is June (83.1mm).

Average rainfall days in September - Montevideo, Uruguay
  • Average rainfall days in September: 6 days

Months with the highest number of rainy days are February, June, July, October and November (7 days).
Months with the lowest number of rainy days are January, March, April, May, August, September and December (6 days).

Average sea temperature in September - Montevideo, Uruguay
  • Average sea temperature in September: 13.3°C

The best month for swimming (with the highest average sea temperature) is January (24.2°C).
The coldest month (with the lowest average sea temperature) is July (11.3°C).

Average daylight in September / Average sunshine in September - Montevideo, Uruguay
  • Average daylight in September: 11.9h

The month with the longest days is December (Average daylight: 14.5h).
The month with shortest days is June (Average daylight: 9.8h).

  • Average sunshine in September: 6.1h

The month with most sunshine is January (Average sunshine: 9.5h).
The month with least sunshine is June (Average sunshine: 4.3h).

Average UV index in September - Montevideo, Uruguay
  • Average UV index in September: 6

Months with the highest UV index are January and December (UV index 12).
Months with the lowest UV index are June and July (UV index 2).

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