San Nicolás de los Arroyos climate
San Nicolás de los Arroyos (Argentina) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 17 °C63 °F, and about 1,178 mm46 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
San Nicolás de los Arroyos climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 3290 | 1865 | 2578 | 1305.1 | 0 |
| Feb | 3087 | 1763 | 2475 | 1375.4 | 0 |
| Mar | 2882 | 1559 | 2170 | 1445.7 | 0 |
| Apr | 2374 | 1152 | 1763 | 1114.4 | 0 |
| May | 1966 | 846 | 1356 | 672.6 | 0 |
| Jun | 1661 | 541 | 1051 | 361.4 | 2 |
| Jul | 1559 | 439 | 1049 | 451.8 | 4 |
| Aug | 1864 | 541 | 1253 | 562.2 | 2 |
| Sep | 2169 | 745 | 1457 | 752.9 | 0 |
| Oct | 2476 | 1151 | 1864 | 1365.4 | 0 |
| Nov | 2883 | 1457 | 2170 | 1094.3 | 0 |
| Dec | 3188 | 1661 | 2475 | 1335.2 | 0 |
| Year | 3290 | 439 | 1763 | 1,17846 | 8 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 62% | 48% | 7.2 | 14:07 |
| Feb | 68% | 50% | 6.3 | 13:20 |
| Mar | 72% | 46% | 5.2 | 12:23 |
| Apr | 76% | 46% | 3.9 | 11:18 |
| May | 81% | 54% | 2.8 | 10:25 |
| Jun | 81% | 53% | 2.4 | 9:57 |
| Jul | 80% | 55% | 2.6 | 10:09 |
| Aug | 77% | 51% | 3.5 | 10:54 |
| Sep | 73% | 49% | 4.6 | 11:56 |
| Oct | 71% | 51% | 5.7 | 12:59 |
| Nov | 65% | 47% | 6.8 | 13:54 |
| Dec | 61% | 49% | 7.3 | 14:21 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of San Nicolás de los Arroyos is like
The warmest month is January, with an average high of 32 °C90 °F and a low of 18 °C65 °F. The coldest is July, when highs average 15 °C59 °F and lows 4 °C39 °F. There is a clear seasonal cycle, with 15.7 °C28.3 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,178 mm46 in of precipitation per year. The wettest three-month stretch is January–March, which brings 35% of the annual total. The wettest month is March (144 mm5.7 in), the driest is June (36 mm1.4 in).
Relative humidity ranges from 61% in December to 81% in June. The clearest skies (lowest average cloud amount, 46%) are typical of March. Average wind speed near the ground ranges from 5 km/h (3 mph) in April to 6 km/h (4 mph) in September. Daylight lasts from about 10.0 hours in June to 14.3 hours in December.
Best time to visit San Nicolás de los Arroyos
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May and September: average highs of 19 °C66 °F to 21 °C69 °F with 67 mm2.6 in to 75 mm2.9 in of precipitation per month.
The most challenging month is January, which is hot, with average highs of 32 °C90 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for San Nicolás de los Arroyos
- Summer (December–February) — highs 3087 to 32 °C90 °F, lows 1661 to 18 °C65 °F, about 133 mm5.3 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Autumn (March–May) — highs 1966 to 28 °C82 °F, lows 846 to 15 °C59 °F, about 107 mm4.2 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Winter (June–August) — highs 1559 to 18 °C64 °F, lows 439 to 5 °C41 °F, about 46 mm1.8 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
- Spring (September–November) — highs 2169 to 28 °C83 °F, lows 745 to 14 °C57 °F, about 107 mm4.2 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
How San Nicolás de los Arroyos compares
Compared with Rosario, about 59 km to the northwest, San Nicolás de los Arroyos is on average 0.5 °C1 °F cooler and receives 8% more precipitation (1,178 mm46 in vs 1,091 mm43 in). The difference is largest in October (0.8 °C1.4 °F cooler).
Of the 31 places in Argentina covered by World Climates, San Nicolás de los Arroyos is the 17th warmest by annual mean temperature and the 6th wettest by annual precipitation. See all of them on the Argentina climate page.
Places in other countries with the most similar temperature and rainfall pattern: Liverpool (Australia, Cfa), Salto (Uruguay, Cfa) and Richmond (New South Wales) (Australia, Cfa).
Nearby places
- Rosario 59 km · 18 °C64 °F · 1,091 mm43 in
- Santa Fe 193 km · 19 °C67 °F · 1,153 mm45 in
- Merlo 202 km · 17 °C62 °F · 1,108 mm44 in
- Laferrere 217 km · 16 °C62 °F · 1,069 mm42 in
- Buenos Aires 221 km · 18 °C64 °F · 1,103 mm43 in
- Berazategui 243 km · 17 °C62 °F · 1,072 mm42 in
- La Plata 273 km · 17 °C62 °F · 1,072 mm42 in
- Concordia 298 km · 19 °C66 °F · 1,414 mm56 in
Frequently asked questions
What is the warmest month in San Nicolás de los Arroyos?
January is the warmest month in San Nicolás de los Arroyos, with an average high of 32 °C (90 °F) and an average low of 18 °C (65 °F).
What is the coldest month in San Nicolás de los Arroyos?
July is the coldest month, with an average high of 15 °C (59 °F) and an average low of 4 °C (39 °F).
When does it rain the most in San Nicolás de los Arroyos?
March is the wettest month with about 144 mm (5.7 in) of precipitation; June is the driest with about 36 mm (1.4 in).
What is the best time to visit San Nicolás de los Arroyos?
Judging by long-term averages, the most comfortable months are May and September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.