Mercedes Weather in September
With daytime temperatures of 21°C (70°F) and nighttime lows of 10°C (50°F), September in Mercedes brings pleasant temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 90 mm (3.5 in) falls on average.
Rainfall in Mercedes in September
On average, there are about 8 days with rain during this month, averaging 90 mm (3.5 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Mercedes in September
Mercedes has perfect weather in September, with days reaching 21°C (70°F) and nights cooling to 10°C (50°F). The difference between afternoon and evening temperatures is usually noticeable. At 10°C (50°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in Mercedes in September
There are approximately 194 hours of sunshine this month, resulting in mostly clear days.
Wind Speed in Mercedes in September
September sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.
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 Mercedes's climate page.
Mercedes Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
21°C (70°F)
Chance of Rain
25%
Precipitation
90 mm (3.5 in)
Rainy days
8 days
Humidity
72%
Windspeed
4 m/s (8 knots)
Sunshine
194 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Mercedes typically rise from around 18°C (64°F) at the start of September to approximately 22°C (72°F) by the end. Nights are cool, with lows typically ranging from 7°C (45°F) to 10°C (50°F).
Average temperatures in September
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
Historical weather for Mercedes in September
Browse day-by-day weather records for Mercedes spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mercedes historical weather extremes in September
Our historical data for Mercedes spans 1976 to 2025, revealing these weather extremes.
- Mercedes recorded its highest September temperature of 36°C (97°F) on September 11, 2013.
- Mercedes experienced its chilliest September day on September 14, 1981, reaching only 8°C (46°F).
- Mercedes registered its coldest September night on September 2, 1990, with temperatures dropping to -5°C (23°F).
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
What to Wear in Mercedes 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. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Mercedes 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 Mercedes's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Mercedes climate overview or explore weather in Uruguay.
