Montevideo Weather in September

September in Montevideo brings moderate temperatures, with daytime highs of 18°C (64°F) and nights around 10°C (50°F). Quite a bit of rainfall is expected, around 95 mm (3.7 in), so pack an umbrella.

Rainfall in Montevideo in September

Past climate data indicates that roughly 9 days will see rain, totalling around 95 mm (3.7 in) for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Montevideo in September

If you're visiting Montevideo in September, expect highs of 18°C (64°F) and overnight lows around 10°C (50°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. At 10°C (50°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Montevideo in September

The area enjoys a balanced 183 hours of sunlight, ensuring it's neither too overcast nor too sunny.

Wind Speed in Montevideo in September

Wind speeds average 6 m/s (12 knots) during September. At this speed, expect strong winds that make large branches move and create some resistance when walking. Since this is an average, some days have fresh winds while others have strong breezes that can make umbrellas tricky to control.

Average water temperature in September

At 13°C (55°F), the water is cool but manageable for those who don't mind a bit of a shock getting in. Most people adjust after a few minutes.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, March and December typically offer the best weather for Montevideo.

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• January
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• May
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• October
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For a detailed overview over the year and the best time to visit Uruguay, check out our Montevideo's climate page.

Montevideo Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 18°C (64°F)  

Water Temperature 13°C (55°F)  

Chance of Rain 30%  

Precipitation 95 mm (3.7 in)  

Rainy days 9 days  

Humidity 76%  

Windspeed 6 m/s (12 knots)  

Sunshine 183 hours  

Percentage Sunshine  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Montevideo typically stay consistent throughout September, with daily highs averaging around 18°C (64°F). Nights are cool, with lows typically ranging from 8°C (46°F) to 10°C (50°F).

Average temperatures in September

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Montevideo in September

Browse day-by-day weather records for Montevideo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Montevideo historical weather extremes in September

The extremes listed below come from historical weather data collected in Montevideo from 1976 through 2025.

• The warmest day in September was on September 30, 2024, with a maximum of 33°C (91°F).
• The coldest September day was on September 17, 2013, with a maximum of 9°C (48°F).
• Nighttime temperatures dropped to -2°C (28°F) on September 2, 1990, marking the coldest September night on record.

What to Wear in Montevideo in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. With water temperatures around 13°C (55°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Montevideo in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

6/10

Walking

6/10

Barbeque

6/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Uruguay, check out our Montevideo's climate page.

More climate data for Montevideo

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Montevideo climate overview or explore weather in Uruguay.