Las Grutas Weather in September
September in Las Grutas brings pleasant temperatures, with highs of 18°C (64°F) and nights dropping to 7°C (45°F). With perfect weather conditions overall, it's a good time to visit.
Rainfall in Las Grutas in September
You can typically expect 4 days of rain this month, averaging around 24 mm (0.9 in). The odd shower may pass through, but it usually doesn't amount to much. A largely dry month overall.
Temperature in Las Grutas in September
The temperature in Las Grutas in September is perfect. Daytime highs reach 18°C (64°F), with nights dropping to 7°C (45°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With lows around 7°C (45°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Wind Speed in Las Grutas 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.
Average water temperature in September
The water temperature is only 10°C (50°F) this month — cold enough that most people will want to stay out. Hardy swimmers may manage a quick dip, but it won't be comfortable.If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Las Grutas.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Argentina, check out our Las Grutas's climate page.
Las Grutas Temperature in September
Min Temperature
7°C (45°F)
Max Temperature
18°C (64°F)
Water Temperature
10°C (50°F) *
Chance of Rain
12%
Precipitation
24 mm (0.9 in)
Rainy days
4 days
Humidity
56% *
Windspeed
4 m/s (8 knots) *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Las Grutas typically rise from around 16°C (61°F) at the start of September to approximately 19°C (66°F) by the end. Nights are cold, with lows typically ranging from 4°C (39°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 Las Grutas in September
Browse day-by-day weather records for Las Grutas spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Las Grutas historical weather extremes in September
According to our 42 years of weather records for Las Grutas, the following extremes were recorded between 1983 and 2025.
- On September 25, 2021, temperatures climbed to 31°C (88°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 4°C (39°F), recorded on September 18, 1992.
- Nighttime temperatures dropped to -8°C (18°F) on September 7, 1994, marking the coldest September night on record.
Best Places in Argentina in September
Find out more about the weather in Argentina and which places have the best travel conditions in this month. See all of Argentina in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Las Grutas 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. Pack a light rain jacket or compact umbrella for occasional showers. The water temperature sits at about 10°C (50°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water.What To Do in Las Grutas 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 Argentina, check out our Las Grutas's climate page.
Temperature Rainfall Humidity Wind Speed Water Temp
See the full Las Grutas climate overview or explore weather in Argentina.
