Treinta y Tres Weather in September
September in Treinta y Tres brings pleasant temperatures around 20°C (68°F) during the day, dropping to 9°C (48°F) at night, with quite a bit of rainfall expected, averaging around 120 mm (4.7 in) for the month.
Rainfall in Treinta y Tres in September
On average, there are about 10 days with rain during this month, averaging 120 mm (4.7 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Treinta y Tres in September
Daytime highs in Treinta y Tres in September reach 20°C (68°F), with nights around 9°C (48°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With overnight lows of 9°C (48°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Treinta y Tres in September
The month brings about 177 hours of sunlight, offering a comfortable mix of sun and overcast.For Treinta y Tres itself, March and November generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Uruguay, check out our Treinta y Tres's climate page.
Treinta y Tres Temperature in September
Min Temperature
9°C (48°F)
Max Temperature
20°C (68°F)
Chance of Rain
34%
Precipitation
120 mm (4.7 in)
Rainy days
10 days
Humidity
77%
Sunshine
177 hours
Percentage Sunshine
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Treinta y Tres typically stay consistent throughout September, with daily highs averaging around 20°C (68°F). Nights are cool, with lows typically ranging from 8°C (46°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Treinta y Tres in September
Browse day-by-day weather records for Treinta y Tres spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Treinta y Tres historical weather extremes in September
Based on 44 years of weather observations (1981-2025), these are the most extreme conditions recorded in Treinta y Tres.
- Treinta y Tres recorded its highest September temperature of 35°C (95°F) on September 11, 2013.
- The lowest daytime temperature in September was 8°C (46°F), recorded on September 5, 2008.
- Nighttime temperatures dropped to -3°C (27°F) on September 2, 1990, marking the coldest September night on record.
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 →
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tolerable
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What to Wear in Treinta y Tres in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Treinta y Tres in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Uruguay, check out our Treinta y Tres's climate page.
Temperature Rainfall Sunshine Humidity
See the full Treinta y Tres climate overview or explore weather in Uruguay.
