Montevideo weather in September 2025

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 maximum daytime temperature in September in Montevideo18
    18°C max day temperature
  • 7 hours of sunshine per day
  • 9 days with some rainfall in September in Montevideo9
    9 days with some rainfall
  • 9°C minimum night-time temperature in September in Montevideo9
    9°C min night temperature
  • 12 hours of daylight per day in September in Montevideo12
    12 hours of daylight per day
  • No heat & humidity in September in Montevideo0
    No heat & humidity
  • 75 mm monthly rainfall in September in Montevideo75
    75 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Montevideo6
    6 (High) UV index
  • 13°C sea temperature in September in Montevideo13
    13°C sea temperature

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The September weather guide for Uruguay (Montevideo) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Montevideo in September?

Daytime temperatures usually reach 18°C in Montevideo in September, falling to 9°C at night.

How sunny is it in Montevideo in September?

There are normally 7 hours of bright sunshine each day in Montevideo in September - that's 55% of daylight hours.

How warm is the sea around Montevideo in September?

The average sea temperature around Montevideo in September is 13°C.

Does it rain in Montevideo in September?

There are usually 9 days with some rain in Montevideo in September and the average monthly rainfall is 75mm.

Montevideo September sunrise & sunset times

Browse the sunrise and sunset times for Montevideo in September 2025. Select a month to view Montevideo sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 07:03 18:26
Monday, 15th September 2025 06:44 18:36
Tuesday, 30th September 2025 06:22 18:47

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