Climate averages 1991–2020
San Martín weather
in January.
A hot, moderately wet month: the warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a hot month in San Martín: daytime highs average 31.3°C and nights cool to about 20.0°C. By daytime temperature it is the warmest month of the year.
Expect about 48 mm of rain on roughly 8 days, which makes January a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 04 min on an average January day.
The nearest other city in this atlas is Mendoza (41 km away). In January its highs average 28.4°C, 3.0°C cooler than San Martín, with 48 mm of rain.
Among the 67 cities listed in Argentina, San Martín ranks 10th of 67 for the warmest January highs and joint 11th of 67 for the driest January (rainfall, lowest first). The mean January high of those 67 cities is 29.0°C; San Martín is 2.3°C warmer than that mean.
From January to February, average highs fall by 1.6°C to 29.7°C, and monthly rainfall falls from 48 mm to 38 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
San Martín climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 31.3°C20.0°C | 20.0°C | 48 | 7.7 | 14.114 h |
| February | 29.7°C18.6°C | 18.6°C | 38 | 6.4 | 13.313 h |
| March | 26.7°C16.3°C | 16.3°C | 43 | 6.2 | 12.312 h |
| April | 22.0°C11.9°C | 11.9°C | 20 | 4.3 | 11.311 h |
| May | 17.8°C8.1°C | 8.1°C | 12 | 2.6 | 10.410 h |
| June | 14.9°C4.4°C | 4.4°C | 5.5 | 1.3 | 10.010 h |
| July | 14.5°C3.2°C | 3.2°C | 5.6 | 1.6 | 10.210 h |
| August | 17.7°C5.3°C | 5.3°C | 10 | 1.9 | 10.911 h |
| September | 21.1°C8.5°C | 8.5°C | 11 | 2.3 | 11.912 h |
| October | 24.9°C12.5°C | 12.5°C | 20 | 3.9 | 12.913 h |
| November | 28.4°C16.0°C | 16.0°C | 27 | 5.1 | 13.814 h |
| December | 30.9°C18.8°C | 18.8°C | 39 | 6.7 | 14.314 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Mendoza in JanuaryArgentina · 41 kmHigh 28.4°C · Low 17.8°C · 48 mm rain
- Rawson in JanuaryArgentina · 167 kmHigh 30.5°C · Low 18.5°C · 17 mm rain
- San Rafael in JanuaryArgentina · 171 kmHigh 30.5°C · Low 18.3°C · 45 mm rain
- San Juan, Argentina in JanuaryArgentina · 172 kmHigh 31.0°C · Low 19.2°C · 17 mm rain
- Peñalolén in JanuaryChile · 196 kmHigh 26.8°C · Low 15.9°C · 15 mm rain
- San Luis in JanuaryArgentina · 201 kmHigh 29.7°C · Low 19.2°C · 107 mm rain
- Puente Alto in JanuaryChile · 204 kmHigh 27.7°C · Low 15.8°C · 15 mm rain
- Colina in JanuaryChile · 205 kmHigh 29.7°C · Low 18.3°C · 7.7 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for San Martín) is explained once on the San Martín year overview and on the Sources, method and limits page.