, with mild (but sometimes cold at night), dry winters and hot, rainy summers. In summer, rainfall often occurs in the form of thunderstorms.
The city is located in north-central Argentina, at 31 degrees south latitude, and at 715 meters (2,345 feet) above sea level.
About 220 km (135 mi) to the west is the city of Mendoza, which is located at the base of the Andes, while in the vicinity of San Luis we find a smaller mountain range, with peaks reaching 2,200 meters (7,200 ft).
, from late May to mid-August, the difference in temperature between night and day is often considerable, and it gets often cold at night. During cold air outbreaks from the south, the temperature can drop a few degrees below freezing. In July 2007, it dropped to -8 °C (17.5 °F).
all year round. In winter, the temperature can reach or exceed 25 °C (77 °F) when the northwest wind blows, coming down from the mountains.
On the other hand, from September to February there can be heat waves, in which the temperature reaches or exceeds 38/40 °C (100/104 °F). In July 2014, the temperature reached 42 °C (107.5 °F), and the average maximum was 34.8 °C (94.6 °F).
However, the Pampero, the south wind, is able to interrupt the hot and sultry periods, bringing pleasant weather (and sometimes very cool) for two or three days.
To visit San Luis you can choose the intermediate seasons, in particular, the months of April (autumn), and September (spring). It must be said that there can be sudden changes in temperature, sometimes at night it can get cold, while in September it can be very hot, although rarely, and generally at the end of the month.
. Here are the average temperatures.
January, the warmest month of the year, is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of
25 °C, with a minimum of
18.3 °C and a maximum of
31.6 °C.
On the coldest nights of the month, the temperature usually drops to around
12 °C.
On the warmest days of the month, the temperature usually reaches around
37 °C.
Precipitation amounts to
115.3 mm, distributed over 8 days.
The day lasts on average 14 hours and 5 minutes. So the days are long.
There are on average 10.5 hours of sunshine per day. So, the sun shines 76% of the time.
The average humidity is 51%.
The average wind speed is of
16.8 kph.
February is generally a warm to hot month. The average temperature is of
23.6 °C, with a minimum of
17.2 °C and a maximum of
30 °C.
On the coldest nights of the month, the temperature usually drops to around
10 °C.
On the warmest days of the month, the temperature usually reaches around
36 °C.
Precipitation amounts to
112.5 mm, distributed over 7 days.
The day lasts on average 13 hours and 20 minutes.
There are on average 10 hours of sunshine per day. So, the sun shines 74% of the time.
The average humidity is 55%.
The average wind speed is of
16 kph.
March is generally a warm month. The average temperature is of
21.6 °C, with a minimum of
15.5 °C and a maximum of
27.6 °C.
On the coldest nights of the month, the temperature usually drops to around
9 °C.
On the warmest days of the month, the temperature usually reaches around
33.5 °C.
Precipitation amounts to
92.1 mm, distributed over 7 days.
The day lasts on average 12 hours and 20 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 68% of the time.
The average humidity is 60%.
The average wind speed is of
14.6 kph.
April is generally a very mild month. The average temperature is of
17.6 °C, with a minimum of
11.8 °C and a maximum of
23.3 °C.
On the coldest nights of the month, the temperature usually drops to around
4 °C.
On the warmest days of the month, the temperature usually reaches around
29.5 °C.
Precipitation amounts to
44.8 mm, distributed over 4 days.
The day lasts on average 11 hours and 10 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 65% of the time.
The average humidity is 62%.
The average wind speed is of
13.5 kph.
May is generally a mild month. The average temperature is of
14 °C, with a minimum of
8.3 °C and a maximum of
19.6 °C.
On the coldest nights of the month, the temperature usually drops to around
1 °C.
On the warmest days of the month, the temperature usually reaches around
26 °C.
Precipitation amounts to
18.6 mm, distributed over 3 days.
The day lasts on average 10 hours and 25 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 61% of the time.
The average humidity is 63%.
The average wind speed is of
12.1 kph.
June is generally a mild month. The average temperature is of
11 °C, with a minimum of
5 °C and a maximum of
17.1 °C.
On the coldest nights of the month, the temperature usually drops to around
-2 °C.
On the warmest days of the month, the temperature usually reaches around
24.5 °C.
Precipitation amounts to only
5.4 mm, and all occurs in one day.
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 6.5 hours of sunshine per day. So, the sun shines 63% of the time.
The average humidity is 59%.
The average wind speed is of
12.5 kph.
July, the coldest month of the year, is generally a mild month. The average temperature is of
10.4 °C, with a minimum of
4 °C and a maximum of
16.7 °C.
On the coldest nights of the month, the temperature usually drops to around
-2.5 °C.
On the warmest days of the month, the temperature usually reaches around
25 °C.
Precipitation amounts to only
5.4 mm, and all occurs in one day.
The day lasts on average 10 hours and 10 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 68% of the time.
The average humidity is 52%.
The average wind speed is of
13.7 kph.
August is generally a mild month. However, there are remarkable differences between night and day. The average temperature is of
12.8 °C, with a minimum of
6.2 °C and a maximum of
19.5 °C.
On the coldest nights of the month, the temperature usually drops to around
-1.5 °C.
On the warmest days of the month, the temperature usually reaches around
30 °C.
Precipitation amounts to only
8.6 mm, distributed over 2 days.
The day lasts on average 10 hours and 55 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 69% of the time.
The average humidity is 44%.
The average wind speed is of
15.9 kph.
September is generally a very mild month. However, there are remarkable differences between night and day. The average temperature is of
15.8 °C, with a minimum of
9.1 °C and a maximum of
22.4 °C.
On the coldest nights of the month, the temperature usually drops to around
1 °C.
On the warmest days of the month, the temperature usually reaches around
31.5 °C.
Precipitation amounts to
22 mm, distributed over 3 days.
The day lasts on average 11 hours and 55 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 68% of the time.
The average humidity is 42%.
The average wind speed is of
17.2 kph.
October is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of
19 °C, with a minimum of
12.5 °C and a maximum of
25.6 °C.
On the coldest nights of the month, the temperature usually drops to around
4.5 °C.
On the warmest days of the month, the temperature usually reaches around
34 °C.
Precipitation amounts to
50.1 mm, distributed over 5 days.
The day lasts on average 12 hours and 55 minutes.
There are on average 9 hours of sunshine per day. So, the sun shines 70% of the time.
The average humidity is 46%.
The average wind speed is of
19.2 kph.
November is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of
21.8 °C, with a minimum of
15.1 °C and a maximum of
28.5 °C.
On the coldest nights of the month, the temperature usually drops to around
7 °C.
On the warmest days of the month, the temperature usually reaches around
35 °C.
Precipitation amounts to
87.4 mm, distributed over 7 days.
The day lasts on average 13 hours and 55 minutes.
There are on average 10.5 hours of sunshine per day. So, the sun shines 75% of the time.
The average humidity is 46%.
The average wind speed is of
18.6 kph.
December is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of
24 °C, with a minimum of
17.3 °C and a maximum of
30.8 °C.
On the coldest nights of the month, the temperature usually drops to around
11 °C.
On the warmest days of the month, the temperature usually reaches around
37 °C.
Precipitation amounts to
104.9 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 11 hours of sunshine per day. So, the sun shines 77% of the time.
The average humidity is 47%.
The average wind speed is of
18.3 kph.