Río Negro · Patagonia · 40°48′ S
Las Grutas
Patagonia's warmest sea
A beach town on the San Matías Gulf with some of the warmest water on the Argentine coast and caves carved into the cliffs. With huge tides, the beach changes completely in a few hours.
What not to miss
- The cliff caves at low tide
- Las Piletas, natural rock pools
- The Gualicho salt flats on the way
Getting there
About 15 km from San Antonio Oeste and 180 km from Viedma.
Las Grutas, month by month
Tap a month to see what’s on, the weather and how busy it is.
January
Summer
- Hot days (30°), mild nights (16°); almost no rain.
- Pack: light clothes, sunscreen.
February
Summer
- Hot days (29°), mild nights (15°); little rain.
- Pack: light clothes, sunscreen.
March
High season
- Mild days (26°), cool nights (12°); little rain.
- Busy. Book ahead.
- Pack: a jacket for the evening, sunscreen.
April
Quiet
- Mild days (22°), cold nights (8°); little rain.
- Quiet. Quieter.
- Pack: a jacket for the evening, sunscreen.
May
Quiet
- Cool days (17°), cold nights (5°); little rain.
- Quiet. Quieter.
- Pack: a jacket for the evening.
June
Quiet
- Cool days (14°), very cold nights (2°); little rain.
- Quiet. Quieter.
- Pack: a winter coat.
July
Quiet
- Cool days (13°), very cold nights (1°); little rain.
- Quiet. Quieter.
- Pack: a winter coat.
August
Quiet
- Cool days (16°), very cold nights (3°); almost no rain.
- Quiet. Quieter.
- Pack: a winter coat.
September
Quiet
- Cool days (18°), cold nights (4°); almost no rain.
- Quiet. Quieter.
- Pack: a jacket for the evening, sunscreen.
October
Quiet
- Mild days (22°), cold nights (8°); little rain.
- Quiet. Quieter.
- Pack: a jacket for the evening, sunscreen.
November
Spring
- Mild days (26°), cool nights (11°); almost no rain.
- Normal.
- Pack: a jacket for the evening, sunscreen.
December
Summer
- Hot days (29°), cool nights (14°); almost no rain.
- Pack: light clothes, sunscreen.
See the full data (travelers and weather)
Month by month
How many travelers stay in Las Grutas each month. Teal months are the quietest; earth-colored ones, the busiest.
Weather, month by month
Average temperatures and rainfall in Las Grutas. A guide for packing, not a forecast.
The warmest month is January, with highs of 30.4 °C. The coldest is July, with lows of 1 °C. The wettest month is April (38 mm). The driest is August.
See the numbers
| Month | High | Low | Rain |
|---|---|---|---|
| January | 30.4 °C | 15.7 °C | 19 mm |
| February | 29.2 °C | 14.6 °C | 27 mm |
| March | 26.4 °C | 12.3 °C | 33 mm |
| April | 21.5 °C | 7.8 °C | 38 mm |
| May | 16.9 °C | 4.6 °C | 28 mm |
| June | 13.8 °C | 2.1 °C | 26 mm |
| July | 13.4 °C | 1 °C | 21 mm |
| August | 15.8 °C | 2.5 °C | 17 mm |
| September | 18.1 °C | 4.3 °C | 18 mm |
| October | 22 °C | 7.7 °C | 28 mm |
| November | 25.9 °C | 11.1 °C | 19 mm |
| December | 28.9 °C | 13.8 °C | 19 mm |
Source: Argentina's National Weather Service (SMN), San Antonio Oeste Aero station, 1991-2020 averages. The station is about 15 km away. smn.gob.ar