Weather in Montevideo in September 2025
Average weather
Average temperature in Montevideo in September
Going from a maximum of +73°F during the day to a minimum of +39°F during the night, the temperature in September averages around +61°F.
The average maximum temperature goes down 42% by the end of the month, compared with the beginning of the month, from +70°F to +55°F.
Is Montevideo warm or cold in September?
Montevideo is typically mild in September.
Maximum temperatures go up compared to the previous month from +59°F to +61°F. The minimum temperature also goes up from +48°F to +50°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Montevideo:
Water temperature in Montevideo in September
Water in Montevideo in September is Cold. It varies from +52°F to +62°F, with an average of +57°F. This is almost similar to the air temperature, which averages +61°F.
In September, water temperatures are average relative to the rest of the year:
Can you swim in Montevideo in September?
Climate in Montevideo in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +59°F | +61°F | +66°F | ||||
| Min. temperature | ||||||
| +32°F | +34°F | +39°F | ||||
| Max. temperature | ||||||
| +88°F | +90°F | +91°F | ||||
| Rainfall | ||||||
| 84 mm | 84 mm | 97 mm | ||||
| Wind | ||||||
| 4 m/s | 4 m/s | 4 m/s | ||||
| Avg. water temperature | ||||||
| +54°F | +57°F | +64°F | ||||
| Humidity | ||||||
| 78% | 77% | 76% | ||||
| Air pressure | ||||||
| 1017 HPa | 1017 HPa | 1014 HPa | ||||
| Sunny days | ||||||
| 10 | 10 | 10 | ||||
| Cloudy days | ||||||
| 9 | 8 | 8 | ||||
| Rainy days | ||||||
| 9 | 9 | 9 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting warmer as September arrives. The average maximum temperature goes up from +59°F to +61°F during the day. The rainfall amount in September stays the same as in the previous month with a 84 mm of total precipitation. It feels drier, as humidity decreases from 78% to 77%. The average wind speed doesn’t change much during September, staying around 4 m/s. The amount of sunny days stay about the same, averaging 10 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 5 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Montevideo is gradually decreasing during September, going from 5 m/s to 4 m/s over the course of the month.
Rain
How was the weather last September in Montevideo?
Climate Change Over the Years
The climate in Montevideo in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1984 (+65°F) and the highest in 2017 (+72°F). The driest year was 1979 with only 542 mm of rainfall, and the wettest year was 2019 with 3342 mm.
FAQ
Is September a good time to visit Montevideo?
Can you sunbathe in Montevideo in September?
Can you swim in Montevideo in September?
Is Montevideo rainy in September?
Is it sunny in Montevideo in September?
Monthly weather in Montevideo
Source of the data
For this page, we’ve looked at the typical weather in Montevideo, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.