Climate in Colonia (Uruguay)

The climate of Colonia del Sacramento 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, although they decrease a bit in winter.
The city is located in the southwest of Uruguay, at 34 degrees south latitude, on the coast of the River Plate (Río de la Plata), beyond which lies Buenos Aires.



During the day it can get hot all year round, in fact the heat records are around 29/30 °C (84/86°F) even in winter. Instead, from December to March, in summer, there can be heat waves, in which the temperature reaches or exceeds 35 °C (95 °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 8 °C (46 °F) during the day. Also, fog can sometimes form.

Best Time

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To visit Colonia del Sacramento 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.

Colonia - Climate data

In Colonia, the average temperature of the coldest month (July) is of 11.2 °C (52.1 °F), that of the warmest month (January) is of 24 °C (75.2 °F). Here are the average temperatures.
Precipitation amounts to 1145 millimeters (45.1 inches) per year: it is therefore quite abundant. It ranges from 65 mm (2.6 in) in the driest month (July) to 135 mm (5.3 in) in the wettest one (March). Here is the average precipitation.
The sea temperature ranges from 11.5 °C (53 °F) in July, August to 23.5 °C (74 °F) in February. Here are the average sea temperatures.
There are on average around 2505 sunshine hours per year. Here are the average hours of sunshine per day.

Colonia - 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 °C (75 °F), with a minimum of 19.3 °C (66.7 °F) and a maximum of 28.7 °C (83.7 °F).
On the coldest nights of the month, the temperature usually drops to around 13 °C (55.5 °F). However, it dropped to 9.6 °C (49.3 °F) in January 1999.
On the warmest days of the month, the temperature usually reaches around 35 °C (94.5 °F). However, it reached 39.4 °C (102.9 °F) in January 1997.
Precipitation amounts to 100 mm (3.9 in), distributed over 6 days.
The day lasts on average 14 hours and 5 minutes. So the days are long.
There are on average 9.5 hours of sunshine per day. So, the sun shines 66% of the time.
The average humidity is 64%.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 23 °C (74 °F). Therefore, the sea can be considered barely acceptable for swimming.

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February is generally a warm to hot month. The average temperature is of 23.2 °C (74 °F), with a minimum of 18.8 °C (65.8 °F) and a maximum of 27.6 °C (81.7 °F).
On the coldest nights of the month, the temperature usually drops to around 13 °C (55 °F). However, it dropped to 7.8 °C (46 °F) in February 2003.
On the warmest days of the month, the temperature usually reaches around 33.5 °C (92 °F). However, it reached 36.4 °C (97.5 °F) in February 2003.
Precipitation amounts to 100 mm (3.9 in), distributed over 6 days.
The day lasts on average 13 hours and 20 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 63% of the time.
The average humidity is 68%.
The average wind speed is 17 kph (11 mph).
The average sea temperature is of 23.5 °C (74 °F). Therefore, the sea can be considered barely acceptable for swimming.

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March is generally a warm month. The average temperature is of 21.5 °C (71 °F), with a minimum of 17.1 °C (62.8 °F) and a maximum of 26 °C (78.7 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 11 °C (52 °F). However, it dropped to 7.9 °C (46.2 °F) in March 1995.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 32 °C (90 °F). However, it reached 35.1 °C (95.2 °F) in March 2001.
Precipitation amounts to 135 mm (5.3 in), distributed over 6 days.
The day lasts on average 12 hours and 10 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 62% of the time.
The average humidity is 69%.
The average wind speed is 17 kph (11 mph).
The average sea temperature is of 22.5 °C (72.5 °F). Therefore, the sea can be considered barely acceptable for swimming.

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April is generally a warm month. The average temperature is of 18.4 °C (65 °F), with a minimum of 14.3 °C (57.8 °F) and a maximum of 22.4 °C (72.3 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 8.5 °C (47 °F). However, it dropped to 4.4 °C (39.9 °F) in April 2005.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 28.5 °C (83.5 °F). However, it reached 34 °C (93.2 °F) in April 2004.
Precipitation amounts to 110 mm (4.3 in), distributed over 6 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 54% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 17 kph (11 mph).
The average sea temperature is of 19.5 °C (67 °F). Therefore, the sea is very cool for swimming.

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May is generally a very mild month. The average temperature is of 15.1 °C (59 °F), with a minimum of 11.4 °C (52.6 °F) and a maximum of 18.8 °C (65.8 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 5.5 °C (42 °F). However, it dropped to 1.1 °C (34 °F) in May 2008.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 25.5 °C (78 °F). However, it reached 29.7 °C (85.5 °F) in May 1994.
Precipitation amounts to 90 mm (3.5 in), distributed over 5 days.
The day lasts on average 10 hours and 20 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 52% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 16 kph (10 mph).
The average sea temperature is of 16.5 °C (61.5 °F). Therefore, the sea is cold for swimming.

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June is generally a mild month. The average temperature is of 12.4 °C (54 °F), with a minimum of 8.8 °C (47.8 °F) and a maximum of 16 °C (60.9 °F).
On the coldest nights, the temperature usually drops to around 2.5 °C (36.5 °F). However, it dropped to -0.2 °C (31.6 °F) in June 1995.
On the warmest days, the temperature usually reaches around 23 °C (73.5 °F). However, it reached 28 °C (82.4 °F) in June 2020.
Precipitation amounts to 70 mm (2.8 in), distributed over 5 days.
The day lasts on average 9 hours and 55 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 76%. Hence, the air is normally humid.
The average wind speed is 17 kph (11 mph).
The average sea temperature is of 13.5 °C (56 °F). Therefore, the sea is very cold for swimming.

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July, the coldest month of the year, is generally a mild month. The average temperature is of 11.2 °C (52 °F), with a minimum of 7.4 °C (45.4 °F) and a maximum of 14.9 °C (58.8 °F).
On the coldest nights of the month, the temperature usually drops to around 1 °C (34 °F). However, it dropped to -2.2 °C (28 °F) in July 2009.
On the warmest days of the month, the temperature usually reaches around 23.5 °C (74.5 °F). However, it reached 28.8 °C (83.8 °F) in July 1997.
Precipitation amounts to 65 mm (2.6 in), distributed over 5 days.
The day lasts on average 10 hours and 5 minutes.
There are on average 5 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 17 kph (11 mph).
The average sea temperature is of 11.5 °C (52.5 °F). Therefore, the sea is very cold for swimming.

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August is generally a mild month. The average temperature is of 13 °C (55 °F), with a minimum of 8.9 °C (48 °F) and a maximum of 17.2 °C (63 °F).
On the coldest nights of the month, the temperature usually drops to around 3 °C (37 °F). However, it dropped to 0 °C (32 °F) in August 1991.
On the warmest days of the month, the temperature usually reaches around 26.5 °C (79.5 °F). However, it reached 32.4 °C (90.3 °F) in August 1996.
Precipitation amounts to 75 mm (3 in), distributed over 5 days.
The day lasts on average 10 hours and 55 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 53% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 11.5 °C (52.5 °F). Therefore, the sea is very cold for swimming.

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September is generally a very mild month. The average temperature is of 14.6 °C (58 °F), with a minimum of 10.3 °C (50.5 °F) and a maximum of 18.9 °C (66 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 4.5 °C (40 °F). However, it dropped to 2.3 °C (36.1 °F) in September 1995.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 27 °C (80.5 °F). However, it reached 32 °C (89.6 °F) in September 2013.
Precipitation amounts to 75 mm (3 in), distributed over 6 days.
The day lasts on average 11 hours and 55 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 55% of the time.
The average humidity is 69%.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 12.5 °C (54.5 °F). Therefore, the sea is very cold for swimming.

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October is generally a very mild month. The average temperature is of 17.2 °C (63 °F), with a minimum of 12.9 °C (55.2 °F) and a maximum of 21.6 °C (70.8 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 6.5 °C (44 °F). However, it dropped to 3 °C (37.4 °F) in October 2020.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 30 °C (86 °F). However, it reached 35 °C (95 °F) in October 2014.
Precipitation amounts to 110 mm (4.3 in), distributed over 7 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 55% of the time.
The average humidity is 70%.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 15.5 °C (60 °F). Therefore, the sea is cold for swimming.

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November is generally a warm month. The average temperature is of 20 °C (68 °F), with a minimum of 15.2 °C (59.4 °F) and a maximum of 24.8 °C (76.6 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 9 °C (48.5 °F). However, it dropped to 5.3 °C (41.5 °F) in November 2003.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 32 °C (90 °F). However, it reached 35.7 °C (96.3 °F) in November 1995.
Precipitation amounts to 115 mm (4.5 in), distributed over 7 days.
The day lasts on average 14 hours and 0 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 57% of the time.
The average humidity is 65%.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 18.5 °C (65.5 °F). Therefore, the sea is very cool for swimming.

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December is generally a warm to hot month. The average temperature is of 22.8 °C (73 °F), with a minimum of 18 °C (64.5 °F) and a maximum of 27.6 °C (81.7 °F).
On the coldest nights of the month, the temperature usually drops to around 11 °C (52 °F). However, it dropped to 7.2 °C (45 °F) in December 2010.
On the warmest days of the month, the temperature usually reaches around 34 °C (93.5 °F). However, it reached 40 °C (104 °F) in December 2008.
Precipitation amounts to 100 mm (3.9 in), distributed over 6 days.
The day lasts on average 14 hours and 25 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 9 hours of sunshine per day. So, the sun shines 61% of the time.
The average humidity is 61%.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 21.5 °C (70.5 °F). Therefore, the sea is cool for swimming.