Hyperlocal rainfall totals + real-time NOAA forecasts
Accurate weather without the clutter
San Luis, San Luis Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in San Luis, San Luis?
San Luis, San Luis gets 697 mm of precipitation a year over about 53 rainy days. January is the warmest month (average high 33°C) and July the coldest (average low 3°C).
Subtropical monsoon climate
San Luis, San Luis has hot summers and mild winters. Daytime highs range from about 18°C in July to 33°C in January. January is usually the wettest month. The most comfortable time to visit is typically April to September, when daytime highs sit near 21°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Jun–Aug | 4° | 19° |
| Spring | Sep–Nov | 12° | 27° |
| Summer | Dec–Feb | 18° | 32° |
| Autumn | Mar–May | 12° | 24° |
How much rain does San Luis get?
San Luis gets 697 mm of precipitation in an average year, spread over about 53 days with measurable rain. That is fewer rainy days than 54% of Argentina.
January is the wettest month, with 121 mm. June is the driest, with 6 mm. January has the most rainy days, about 8.
San Luis weather by month
San Luis weather in January
In January, San Luis averages a high of 33°C and a low of 18°C. It gets 121 mm of precipitation over about 8 rainy days. Estimated sunshine is 64% of daylight hours, derived from ERA5 cloud cover. The January record high is 42°C (2014) and the record low is 7°C (2005).
San Luis weather in February
In February, San Luis averages a high of 32°C and a low of 17°C. It gets 115 mm of precipitation over about 7 rainy days. Estimated sunshine is 69% of daylight hours, derived from ERA5 cloud cover. The February record high is 41°C (2025) and the record low is 6°C (2023).
San Luis weather in March
In March, San Luis averages a high of 29°C and a low of 16°C. It gets 80 mm of precipitation over about 6 rainy days. Estimated sunshine is 70% of daylight hours, derived from ERA5 cloud cover. The March record high is 37°C (2020) and the record low is 1°C (2022).
San Luis weather in April
In April, San Luis averages a high of 24°C and a low of 12°C. It gets 60 mm of precipitation over about 5 rainy days. Estimated sunshine is 69% of daylight hours, derived from ERA5 cloud cover. The April record high is 33°C (1995) and the record low is -2°C (1999). April is one of the most comfortable months to visit.
San Luis weather in May
In May, San Luis averages a high of 21°C and a low of 8°C. It gets 18 mm of precipitation over about 3 rainy days. Estimated sunshine is 67% of daylight hours, derived from ERA5 cloud cover. The May record high is 33°C (1977) and the record low is -7°C (1984). May is one of the most comfortable months to visit.
San Luis weather in June
In June, San Luis averages a high of 18°C and a low of 4°C. It gets 6 mm of precipitation over about 2 rainy days. Estimated sunshine is 65% of daylight hours, derived from ERA5 cloud cover. The June record high is 32°C (1977) and the record low is -8°C (1999). June is one of the most comfortable months to visit.
San Luis weather in July
In July, San Luis averages a high of 18°C and a low of 3°C. It gets 10 mm of precipitation over about 2 rainy days. Estimated sunshine is 71% of daylight hours, derived from ERA5 cloud cover. The July record high is 32°C (1997) and the record low is -9°C (1989). July is one of the most comfortable months to visit.
San Luis weather in August
In August, San Luis averages a high of 21°C and a low of 6°C. It gets 13 mm of precipitation over about 2 rainy days. Estimated sunshine is 72% of daylight hours, derived from ERA5 cloud cover. The August record high is 34°C (2015) and the record low is -6°C (1999). August is one of the most comfortable months to visit.
San Luis weather in September
In September, San Luis averages a high of 24°C and a low of 9°C. It gets 26 mm of precipitation over about 3 rainy days. Estimated sunshine is 74% of daylight hours, derived from ERA5 cloud cover. The September record high is 36°C (2018) and the record low is -3°C (1990). September is one of the most comfortable months to visit.
San Luis weather in October
In October, San Luis averages a high of 27°C and a low of 12°C. It gets 50 mm of precipitation over about 4 rainy days. Estimated sunshine is 73% of daylight hours, derived from ERA5 cloud cover. The October record high is 40°C (2009) and the record low is -1°C (1991).
San Luis weather in November
In November, San Luis averages a high of 30°C and a low of 15°C. It gets 94 mm of precipitation over about 6 rainy days. Estimated sunshine is 66% of daylight hours, derived from ERA5 cloud cover. The November record high is 38°C (1988) and the record low is 1°C (2021).
San Luis weather in December
In December, San Luis averages a high of 32°C and a low of 17°C. It gets 104 mm of precipitation over about 7 rainy days. Estimated sunshine is 69% of daylight hours, derived from ERA5 cloud cover. The December record high is 40°C (1987) and the record low is 5°C (1979).
Sunshine, humidity and wind in San Luis
September is the sunniest month in San Luis, with estimated sunshine of 74% of daylight hours from ERA5 cloud cover. January is the cloudiest, at 64%. The annual cloud-cover estimate is 69% of daylight hours; it is not a measurement of sunshine duration. San Luis is sunnier than 91% of Argentina.
Humidity peaks in April at 59% and is lowest in September at 34%.
San Luis has about 27 days a year above 32°C. San Luis is hotter than 55% of Argentina.
First and last freeze in San Luis
The first fall freeze in San Luis typically comes around June 7, and the last spring freeze around August 26. That leaves a frost-free growing season of about 285 days.
San Luis weather records
These records cover SAN LUIS during 1973–2025. Earlier records or other stations in the city may differ.
The hottest temperature on record at the San Luis station is 42°C, on January 23, 2014. The coldest is -9°C, on July 6, 1989.
The wettest day in the available station history brought 282 mm of precipitation, on February 28, 1995.
35 all-time records have been set at the station since 1973.
The best time to visit San Luis
The most comfortable time to visit is typically April to September, when daytime highs sit near 21°C.
Winter (June–August) is mild, with average highs around 19°C and lows near 5°C.
Spring (September–November) is warm, with average highs around 27°C and lows near 12°C.
Summer (December–February) is hot, with average highs around 32°C and lows near 18°C.
Autumn (March–May) is warm, with average highs around 25°C and lows near 12°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 18° | 33° | 121 mm | 8 | 51% | 64% | 42° | 7° |
| February | 17° | 32° | 115 mm | 7 | 55% | 69% | 41° | 6° |
| March | 16° | 29° | 80 mm | 6 | 57% | 70% | 37° | 1° |
| April | 12° | 24° | 60 mm | 5 | 59% | 69% | 33° | -2° |
| May | 8° | 21° | 18 mm | 3 | 54% | 67% | 33° | -7° |
| June | 4° | 18° | 5.8 mm | 2 | 52% | 65% | 32° | -8° |
| July | 3° | 18° | 10 mm | 2 | 46% | 71% | 32° | -9° |
| August | 6° | 21° | 13 mm | 2 | 36% | 72% | 34° | -6° |
| September | 9° | 24° | 26 mm | 3 | 34% | 74% | 36° | -3° |
| October | 12° | 27° | 50 mm | 4 | 38% | 73% | 40° | -1° |
| November | 15° | 30° | 94 mm | 6 | 42% | 66% | 38° | 1° |
| December | 17° | 32° | 104 mm | 7 | 43% | 69% | 40° | 5° |
Station: SAN LUIS, 4 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1973–2025; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
San Luis climate questions
How much rain does San Luis get?
San Luis gets 697 mm of precipitation in an average year, over about 53 rainy days.
What is the wettest month in San Luis?
January is the wettest month in San Luis, with 121 mm. June is the driest, with 6 mm.
How many rainy days does San Luis have a year?
San Luis has about 53 days with measurable rain in an average year. January has the most, about 8.
What is the hottest month in San Luis?
January is the warmest month in San Luis, with an average high of 33°C.
What is the coldest month in San Luis?
July is the coldest month in San Luis, with an average low of 3°C.
What is the record high temperature in San Luis?
Within the available 1973–2025 station history, the record high at the San Luis station is 42°C, set on January 23, 2014. The record low is -9°C, on July 6, 1989.
What is the sunniest month in San Luis?
September is the sunniest month in San Luis, with estimated sunshine of 74% of daylight hours from ERA5 cloud cover. January is the cloudiest.
When is the first frost in San Luis?
The first fall freeze in San Luis typically comes around June 7. The last spring freeze is around August 26.
What is the best time to visit San Luis?
The most comfortable time to visit is typically April to September, when daytime highs sit near 21°C.