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San Justo Weather by Month
Average temperatures, rainfall and humidity for San Justo, Argentina, month by month, built from OpenWeather’s historical records. Use it to see what a typical San Justo month looks like before you travel — then check the live San Justo forecast for the days ahead.
Warmest month
January
30°C average high
Coolest month
July
8°C average low
Wettest month
October
50 mm of rain
Driest month
June
23 mm of rain
Average temperature and rainfall in San Justo by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 30°C | 20°C | 9°C / 41°C | 38 mm | 64% | 14 km/h |
| February | 29°C | 19°C | 8°C / 39°C | 30 mm | 68% | 13 km/h |
| March | 26°C | 17°C | 1°C / 38°C | 36 mm | 71% | 13 km/h |
| April | 23°C | 14°C | 3°C / 32°C | 50 mm | 76% | 14 km/h |
| May | 18°C | 10°C | 1°C / 27°C | 42 mm | 79% | 12 km/h |
| June | 16°C | 8°C | -4°C / 26°C | 23 mm | 77% | 12 km/h |
| July | 15°C | 8°C | -2°C / 27°C | 29 mm | 78% | 11 km/h |
| August | 17°C | 9°C | -3°C / 29°C | 25 mm | 72% | 14 km/h |
| September | 19°C | 11°C | 0°C / 31°C | 35 mm | 72% | 13 km/h |
| October | 22°C | 13°C | 3°C / 35°C | 50 mm | 70% | 13 km/h |
| November | 26°C | 16°C | 7°C / 36°C | 50 mm | 65% | 14 km/h |
| December | 29°C | 18°C | 8°C / 39°C | 32 mm | 63% | 13 km/h |
Best time to visit San Justo
The most comfortable time to visit San Justo is generally March to April and November, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rainfall is spread evenly across the months, totalling about 441 mm a year.
Travellers who prefer heat should aim for January, when highs average 30°C. October is the month to avoid if rain would spoil your plans — it averages 50 mm, roughly 2× the rainfall of the driest month (June).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the San Justo forecast for what is happening now.