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Cabo Polonio Weather in September
During September, Cabo Polonio experiences moderate daytime temperatures of 17°C (63°F) and cooler nights around 11°C (52°F). Expect quite a bit of rainfall. Around 104 mm (4.1 in) is typical.
Rainfall in Cabo Polonio in September
You can expect rain on roughly 11 days based on historical data, averaging 104 mm (4.1 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Cabo Polonio in September
Daytime temperatures in Cabo Polonio reach 17°C (63°F) in September, dropping to 11°C (52°F) at night. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With lows of 11°C (52°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Cabo Polonio in September
The city usually sees around 182 hours of sunlight, indicating a moderately sunny period.September in Cabo Polonio has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Cabo Polonio Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
17°C (63°F)
Chance of Rain
36%
Precipitation
104 mm (4.1 in)
Rainy days
11 days
Humidity
79% *
Sunshine
182 hours *
Percentage Sunshine
*
* Data from: Rocha, Uruguay (51 KM, 31 Miles).
Cabo Polonio Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Cabo Polonio - and find the best time to visit.
Daily Historical Temperatures
47-year average (1979-2025)
Based on our historical records, temperatures in Cabo Polonio typically stay consistent throughout September, with daily highs averaging around 17°C (63°F). Nights are cool, with lows typically ranging from 8°C (46°F) to 10°C (50°F).
Average temperatures in September
Daily Historical Precipitation
47-year average (1979-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Cabo Polonio in September
Browse day-by-day weather records for Cabo Polonio spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Cabo Polonio historical weather extremes in September
Based on 44 years of weather observations in Cabo Polonio between 1981 and 2025, these are the recorded extremes.
- The hottest September day on record in Cabo Polonio reached 31°C (88°F) (September 10, 2007).
- The coldest September day was on September 4, 1986, with a maximum of 9°C (48°F).
- The lowest overnight temperature recorded in September was -3°C (27°F) (September 4, 1988).
Best Places in Uruguay in September
Find out more about the weather in Uruguay and which places have the best travel conditions in this month. See all of Uruguay in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Cabo Polonio in September
For Cabo Polonio in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Sunglasses could come in handy during the sunnier parts of your trip.
What To Do in Cabo Polonio in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming5/10 -
Cycling5/10 -
Walking5/10 -
Camping6/10 -
Outdoor sports9/10
Cabo Polonio 3-Day Forecast
More climate data for Cabo Polonio
Temperature Rainfall Sunshine Humidity
See the full Cabo Polonio climate overview or explore weather in Uruguay.
Popular in September
Where to go in September - average daytime high across popular destinations.
Colonia del Sacramento
18°C (64°F) Montevideo18°C (64°F) La Pedrera17°C (63°F) José Ignacio
17°C (63°F) Piriápolis17°C (63°F) La Paloma16°C (61°F) Punta Del Diablo17°C (63°F) Punta del Este16°C (61°F) Bucket list
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