(according to the Köppen classification, humid subtropical climate - Cfa), with mild winters and hot, rainy summers. In summer, rainfall often occurs in the form of thunderstorms.
, from June to August, is mild, and is the relatively driest season, however, it can sometimes get cold at night. During cold spells, the temperature can drop a few degrees below freezing. The record is -7 °C (19.5 °F), set in June 1967. Sometimes fog can form.
all year round, in fact the records are equal to or higher than 30 °C (86 °F) even in winter.
, from December to February, is hot and sunny, although thunderstorms are quite frequent. There can be heat waves, during which the temperature can reach 38/40 °C (100/104 °F). In January 2022 it reached 41.9 °C (107.4 °F). On other occasions, it can get very cool at night.
Gualeguaychú is a city of 110,000 inhabitants located in the northeast of Argentina, at 33 degrees south latitude, in the province of Entre Ríos, and about 20 kilometers away from the border with Uruguay.
. Here are the average temperatures.
January, the hottest month of the year, is generally a warm to hot month. The average temperature is of
25 °C, with a minimum of
18.8 °C and a maximum of
31.2 °C.

On the coldest nights of the month, the temperature usually drops to around
12 °C. However, it dropped to
7 °C in January 1999.

On the warmest days of the month, the temperature usually reaches around
37.5 °C. However, it reached
41 °C in January 2006.

Precipitation amounts to
130.3 mm, 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 59% of the time.
The average humidity is 64%.
The average wind speed is of
9.7 kph.
February is generally a warm to hot month. The average temperature is of
23.8 °C, with a minimum of
18 °C and a maximum of
29.7 °C.

On the coldest nights of the month, the temperature usually drops to around
10.5 °C. However, it dropped to
7.5 °C in February 1996.

On the warmest days of the month, the temperature usually reaches around
36 °C. However, it reached
38.5 °C in February 2003.

Precipitation amounts to
122.9 mm, distributed over 6 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 69%.
The average wind speed is of
9.3 kph.
March is generally a warm month. The average temperature is of
22.2 °C, with a minimum of
16.3 °C and a maximum of
28 °C.

On the coldest nights of the month, the temperature usually drops to around
8.5 °C. However, it dropped to
5.3 °C in March 2012.

On the warmest days of the month, the temperature usually reaches around
34.5 °C. However, it reached
37.5 °C in March 1999.

Precipitation amounts to
128.4 mm, distributed over 6 days.
The day lasts on average 12 hours and 10 minutes.

There are on average 6.5 hours of sunshine per day. So, the sun shines 53% of the time.
The average humidity is 70%. Hence, the air is normally humid.
The average wind speed is of
8.9 kph.
April is generally a warm month. The average temperature is of
18.4 °C, with a minimum of
12.7 °C and a maximum of
24.2 °C.

On the coldest nights of the month, the temperature usually drops to around
4.5 °C. However, it dropped to
0.2 °C in April 2008.

On the warmest days of the month, the temperature usually reaches around
31.5 °C. However, it reached
36 °C in April 2018.

Precipitation amounts to
124.4 mm, distributed over 7 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 52% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is of
8.8 kph.
May is generally a very mild month. The average temperature is of
15 °C, with a minimum of
9.8 °C and a maximum of
20.2 °C.

On the coldest nights of the month, the temperature usually drops to around
1 °C. However, it dropped to
-4 °C in May 2008.

On the warmest days of the month, the temperature usually reaches around
28 °C. However, it reached
32.7 °C in May 2008.

Precipitation amounts to
81.8 mm, distributed over 5 days.
The day lasts on average 10 hours and 25 minutes.

There are on average 5 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is of
8.3 kph.
June is generally a mild month. The average temperature is of
12.1 °C, with a minimum of
6.9 °C and a maximum of
17.3 °C.

On the coldest nights of the month, the temperature usually drops to around
-1.5 °C. However, it dropped to
-5.7 °C in June 1995.

On the warmest days of the month, the temperature usually reaches around
25.5 °C. However, it reached
29 °C in June 2015.

Precipitation amounts to
57.8 mm, distributed over 4 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 43% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is of
9.5 kph.
July, the coldest month of the year, is generally a mild month. The average temperature is of
11.3 °C, with a minimum of
6 °C and a maximum of
16.6 °C.

On the coldest nights of the month, the temperature usually drops to around
-2 °C. However, it dropped to
-4.8 °C in July 2012.

On the warmest days of the month, the temperature usually reaches around
26 °C. However, it reached
31.3 °C in July 1997.

Precipitation amounts to
56.5 mm, distributed over 4 days.
The day lasts on average 10 hours and 10 minutes.

There are on average 5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is of
10.2 kph.
August is generally a mild month. The average temperature is of
13.4 °C, with a minimum of
7.4 °C and a maximum of
19.3 °C.

On the coldest nights of the month, the temperature usually drops to around
-1.5 °C. However, it dropped to
-5.1 °C in August 1995.

On the warmest days of the month, the temperature usually reaches around
29.5 °C. However, it reached
34.7 °C in August 2009.

Precipitation amounts to
60.6 mm, distributed over 5 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 51% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is of
11.2 kph.
September is generally a very mild month. The average temperature is of
15.1 °C, with a minimum of
9.3 °C and a maximum of
20.9 °C.

On the coldest nights of the month, the temperature usually drops to around
1 °C. However, it dropped to
-2.3 °C in September 2002.

On the warmest days of the month, the temperature usually reaches around
30 °C. However, it reached
37 °C in September 2013.

Precipitation amounts to
78.6 mm, distributed over 6 days.
The day lasts on average 11 hours and 55 minutes.

There are on average 5.5 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 69%.
The average wind speed is of
12.1 kph.
October is generally a warm month. The average temperature is of
18.1 °C, with a minimum of
12.4 °C and a maximum of
23.8 °C.

On the coldest nights of the month, the temperature usually drops to around
5 °C. However, it dropped to
-1 °C in October 1999.

On the warmest days of the month, the temperature usually reaches around
32 °C. However, it reached
37.1 °C in October 2014.

Precipitation amounts to
121 mm, distributed over 7 days.
The day lasts on average 13 hours and 0 minutes.

There are on average 6 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 69%.
The average wind speed is of
11.8 kph.
November is generally a warm month. The average temperature is of
21 °C, with a minimum of
14.8 °C and a maximum of
27.2 °C.

On the coldest nights of the month, the temperature usually drops to around
7.5 °C. However, it dropped to
2 °C in November 2007.

On the warmest days of the month, the temperature usually reaches around
35 °C. However, it reached
39.3 °C in November 2020.

Precipitation amounts to
115.5 mm, 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 64%.
The average wind speed is of
11.6 kph.
December is generally a warm to hot month. The average temperature is of
23.5 °C, with a minimum of
17.1 °C and a maximum of
29.9 °C.

On the coldest nights of the month, the temperature usually drops to around
10 °C. However, it dropped to
5.5 °C in December 2010.

On the warmest days of the month, the temperature usually reaches around
36.5 °C. However, it reached
40.7 °C in December 1999.

Precipitation amounts to
140.2 mm, distributed over 8 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 7.5 hours of sunshine per day. So, the sun shines 53% of the time.
The average humidity is 62%.
The average wind speed is of
10.9 kph.