Weather and climate in Treinta Y Tres (Uruguay)

The climate of Treinta y Tres is subtropical (according to the Köppen classification: humid subtropical climate - Cfa), with mild winters (from June to August) and hot summers (from December to March). The rains are well distributed throughout the year.
The city is located in the east of Uruguay, at 33 degrees south latitude, on the banks of the Olimar Grande River, 80 km (50 mi) from the border with Brazil and 110 km (68 mi) from the Atlantic Ocean coast.



During the day it can get hot all year round, in fact the heat records are around 30 °C (86 °F) even in winter. Instead, from December to March, in summer, there can be heat waves, in which the temperature reaches 38/39 °C (100/102 °F). However, the south wind is able to interrupt the hot and sultry periods, bringing pleasant (and sometimes very cool) weather for two or three days.
In winter, there can be cold waves from the south, during which the temperature can drop to the freezing point or a little below at night, and can remain around 10 °C (50 °F) during the day. Also, fog can sometimes form.

Best Time

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To visit Treinta y Tres you can choose spring and autumn (in particular, the months of October and April), even though they are quite rainy seasons.
If you want you can also choose the summer, since the city is mitigated by the ocean, however, sometimes it can get very hot. Even in the height of summer, it is advisable to bring a sweatshirt for cooler evenings.
However, the winter is not a prohibitive season, and it rarely gets very cold.

Treinta Y Tres - Climate data

The average temperature of the coldest month (July) is of 11.4 °C (52.6 °F), that of the warmest month (January) is of 24.3 °C (75.7 °F). Here are the average temperatures.
Precipitation amounts to 1410 millimeters (55.5 inches) per year: it is therefore quite abundant. It ranges from 105 mm (4.1 in) in the driest months (January, September) to 135 mm (5.3 in) in the wettest ones (April, May) Here is the average precipitation.
There are on average around 2385 sunshine hours per year. Here are the average hours of sunshine per day.

Treinta Y Tres - Weather by month

Based on the period 1991-2020

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January, the warmest month of the year, is generally a warm to hot month. The average temperature is of 24.3 °C (76 °F), with a minimum of 17.9 °C (64.2 °F) and a maximum of 30.6 °C (87.2 °F).
On the coldest nights of the month, the temperature usually drops to around 10 °C (50 °F). However, it dropped to 7.4 °C (45.3 °F) in January 1992.
On the warmest days of the month, the temperature usually reaches around 36 °C (97 °F). However, it reached 39 °C (102.2 °F) in January 2006.
Precipitation amounts to 105 mm (4.1 in), distributed over 6 days.
The day lasts on average 14 hours and 0 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 61% of the time.
The average humidity is 68%.
The average wind speed is 9 kph (5 mph).

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February is generally a warm to hot, muggy month. The average temperature is of 23.4 °C (74 °F), with a minimum of 17.5 °C (63.4 °F) and a maximum of 29.4 °C (84.8 °F).
On the coldest nights of the month, the temperature usually drops to around 9.5 °C (48.5 °F). However, it dropped to 7.4 °C (45.3 °F) in February 2001.
On the warmest days of the month, the temperature usually reaches around 35.5 °C (95.5 °F). However, it reached 38.1 °C (100.6 °F) in February 1991.
Precipitation amounts to 130 mm (5.1 in), distributed over 7 days.
The day lasts on average 13 hours and 10 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 58% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 8 kph (5 mph).

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March is generally a warm month. The average temperature is of 22.2 °C (72 °F), with a minimum of 16.3 °C (61.4 °F) and a maximum of 28.1 °C (82.6 °F).
On the coldest nights, the temperature usually drops to around 8.5 °C (47.5 °F). However, it dropped to 4.7 °C (40.5 °F) in March 1995.
On the warmest days, the temperature usually reaches around 33.5 °C (92.5 °F). However, it reached 39 °C (102.2 °F) in March 2005.
Precipitation amounts to 110 mm (4.3 in), distributed over 5 days.
The day lasts on average 12 hours and 10 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 58% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 7 kph (4 mph).

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April is generally a warm month. The average temperature is of 18.7 °C (66 °F), with a minimum of 13.1 °C (55.6 °F) and a maximum of 24.2 °C (75.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 5 °C (41 °F). However, it dropped to 3 °C (37.4 °F) in April 1994.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 31 °C (87.5 °F). However, it reached 35.9 °C (96.6 °F) in April 2004.
Precipitation amounts to 135 mm (5.3 in), distributed over 5 days.
The day lasts on average 11 hours and 10 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 55% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 8 kph (5 mph).

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May is generally a very mild month. The average temperature is of 15.0 °C (59 °F), with a minimum of 9.6 °C (49.4 °F) and a maximum of 20.3 °C (68.5 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 2 °C (36 °F). However, it dropped to -0.4 °C (31.3 °F) in May 1997.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 27 °C (80.5 °F). However, it reached 30.8 °C (87.4 °F) in May 1999.
Precipitation amounts to 135 mm (5.3 in), distributed over 6 days.
The day lasts on average 10 hours and 25 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 53% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 6 kph (4 mph).

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June is generally a mild month. The average temperature is of 12.7 °C (55 °F), with a minimum of 7.7 °C (45.9 °F) and a maximum of 17.7 °C (63.8 °F).
On the coldest nights, the temperature usually drops to around -0.5 °C (31 °F). However, it dropped to -6 °C (21.2 °F) in June 2002.
On the warmest days, the temperature usually reaches around 24.5 °C (76 °F). However, it reached 28.2 °C (82.8 °F) in June 2004.
Precipitation amounts to 130 mm (5.1 in), distributed over 6 days.
The day lasts on average 10 hours and 0 minutes. June 21, the winter solstice, is the shortest day of the year in the Southern Hemisphere.
There are on average 4.5 hours of sunshine per day. So, the sun shines 44% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is 7 kph (4 mph).

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July, the coldest month of the year, is generally a mild month. The average temperature is of 11.4 °C (53 °F), with a minimum of 6 °C (42.9 °F) and a maximum of 16.9 °C (62.3 °F).
On the coldest nights of the month, the temperature usually drops to around -1.5 °C (29.5 °F). However, it dropped to -3 °C (26.6 °F) in July 1993.
On the warmest days of the month, the temperature usually reaches around 26 °C (79 °F). However, it reached 30.2 °C (86.4 °F) in July 2005.
Precipitation amounts to 120 mm (4.7 in), distributed over 6 days.
The day lasts on average 10 hours and 10 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 7 kph (5 mph).

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August is generally a mild month. The average temperature is of 13.6 °C (57 °F), with a minimum of 7.8 °C (46.1 °F) and a maximum of 19.4 °C (67 °F).
On the coldest nights of the month, the temperature usually drops to around 0 °C (32 °F). However, it dropped to -2.4 °C (27.7 °F) in August 1992.
On the warmest days of the month, the temperature usually reaches around 28.5 °C (83 °F). However, it reached 34.7 °C (94.5 °F) in August 2002.
Precipitation amounts to 115 mm (4.5 in), distributed over 7 days.
The day lasts on average 11 hours and 0 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 8 kph (5 mph).

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September is generally a very mild month. The average temperature is of 14.8 °C (59 °F), with a minimum of 9.1 °C (48.4 °F) and a maximum of 20.5 °C (68.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 1.5 °C (34.5 °F). However, it dropped to -1 °C (30.2 °F) in September 2003.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 29 °C (84.5 °F). However, it reached 37.6 °C (99.7 °F) in September 1994.
Precipitation amounts to 105 mm (4.1 in), distributed over 7 days.
The day lasts on average 11 hours and 55 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 9 kph (6 mph).

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October is generally a very mild month. The average temperature is of 17.9 °C (64 °F), with a minimum of 12.2 °C (53.9 °F) and a maximum of 23.5 °C (74.4 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 4 °C (39 °F). However, it dropped to 0.2 °C (32.4 °F) in October 1999.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 31 °C (88 °F). However, it reached 34.1 °C (93.4 °F) in October 1993.
Precipitation amounts to 110 mm (4.3 in), distributed over 6 days.
The day lasts on average 13 hours and 0 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 52% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 9 kph (6 mph).

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November is generally a warm month. The average temperature is of 19.8 °C (68 °F), with a minimum of 13.6 °C (56.4 °F) and a maximum of 26 °C (78.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 6 °C (42.5 °F). However, it dropped to 2.2 °C (36 °F) in November 2003.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 33 °C (91.5 °F). However, it reached 35.8 °C (96.4 °F) in November 1996.
Precipitation amounts to 110 mm (4.3 in), distributed over 6 days.
The day lasts on average 13 hours and 55 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 57% of the time.
The average humidity is 69%.
The average wind speed is 10 kph (6 mph).

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December is generally a warm to hot month. The average temperature is of 22.7 °C (73 °F), with a minimum of 16.2 °C (61.2 °F) and a maximum of 29.1 °C (84.4 °F).
On the coldest nights of the month, the temperature usually drops to around 8.5 °C (47.5 °F). However, it dropped to 5.2 °C (41.4 °F) in December 1995.
On the warmest days of the month, the temperature usually reaches around 35 °C (95.5 °F). However, it reached 40.7 °C (105.3 °F) in December 1995.
Precipitation amounts to 110 mm (4.3 in), distributed over 5 days.
The day lasts on average 14 hours and 20 minutes. So the days are long. December 21, the summer solstice, is the longest day of the year in the Southern Hemisphere.
There are on average 8.5 hours of sunshine per day. So, the sun shines 59% of the time.
The average humidity is 66%.
The average wind speed is 9 kph (6 mph).