Climate averages 1991–2020
Rosario weather
in January.
A hot, wet month: the warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a hot month in Rosario: daytime highs average 30.0°C and nights cool to about 20.1°C. By daytime temperature it is the warmest month of the year.
Expect about 102 mm of rain on roughly 8 days, which makes January a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 03 min on an average January day.
The nearest other city in this atlas is Gobernador Gálvez (9 km away). In January its highs average 29.9°C, about as warm as Rosario, with 102 mm of rain.
Among the 67 cities listed in Argentina, Rosario ranks 23rd of 67 for the warmest January highs and joint 43rd of 67 for the driest January (rainfall, lowest first). The mean January high of those 67 cities is 29.0°C; Rosario is 1.0°C warmer than that mean.
From January to February, average highs fall by 1.6°C to 28.4°C, and monthly rainfall rises from 102 mm to 113 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
Rosario climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 30.0°C20.1°C | 20.1°C | 102 | 8.1 | 14.114 h |
| February | 28.4°C19.3°C | 19.3°C | 113 | 8.5 | 13.313 h |
| March | 26.6°C17.5°C | 17.5°C | 126 | 7.6 | 12.312 h |
| April | 22.7°C14.1°C | 14.1°C | 103 | 7.9 | 11.311 h |
| May | 18.8°C11.1°C | 11.1°C | 66 | 6.0 | 10.510 h |
| June | 16.0°C8.1°C | 8.1°C | 40 | 4.6 | 10.010 h |
| July | 15.4°C6.9°C | 6.9°C | 36 | 5.0 | 10.210 h |
| August | 18.1°C8.1°C | 8.1°C | 53 | 4.6 | 10.911 h |
| September | 20.4°C10.1°C | 10.1°C | 61 | 5.8 | 11.912 h |
| October | 23.2°C13.1°C | 13.1°C | 111 | 9.7 | 12.913 h |
| November | 26.3°C15.8°C | 15.8°C | 115 | 8.3 | 13.814 h |
| December | 28.8°C18.5°C | 18.5°C | 104 | 8.6 | 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
- Gobernador Gálvez in JanuaryArgentina · 9 kmHigh 29.9°C · Low 20.2°C · 102 mm rain
- San Nicolás de los Arroyos in JanuaryArgentina · 59 kmHigh 29.7°C · Low 20.3°C · 103 mm rain
- Pergamino in JanuaryArgentina · 105 kmHigh 29.2°C · Low 19.0°C · 103 mm rain
- Paraná in JanuaryArgentina · 135 kmHigh 30.1°C · Low 20.7°C · 105 mm rain
- Santa Fe in JanuaryArgentina · 144 kmHigh 30.5°C · Low 21.2°C · 112 mm rain
- Venado Tuerto in JanuaryArgentina · 152 kmHigh 29.1°C · Low 19.2°C · 110 mm rain
- Junín in JanuaryArgentina · 185 kmHigh 28.9°C · Low 18.6°C · 114 mm rain
- Zárate in JanuaryArgentina · 197 kmHigh 29.3°C · Low 19.2°C · 95 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 Rosario) is explained once on the Rosario year overview and on the Sources, method and limits page.
Gobernador Gálvez lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.