Climate averages 1991–2020
Rosario weather
in August.
A mild, moderately wet month: the 10th warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Rosario: daytime highs average 18.1°C and nights cool to about 8.1°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 53 mm of rain on roughly 5 days, which makes August a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 55 min on an average August day.
The nearest other city in this atlas is Gobernador Gálvez (9 km away). In August its highs average 18.1°C, about as warm as Rosario, with 53 mm of rain.
Among the 67 cities listed in Argentina, Rosario ranks joint 22nd of 67 for the warmest August highs and joint 29th of 67 for the driest August (rainfall, lowest first). The mean August high of those 67 cities is 17.2°C; Rosario is 0.9°C warmer than that mean.
From August to September, average highs rise by 2.3°C to 20.4°C, and monthly rainfall rises from 53 mm to 61 mm.
The annual picture
August 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 | 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, selected | 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
August in nearby cities
- Gobernador Gálvez in AugustArgentina · 9 kmHigh 18.1°C · Low 8.3°C · 53 mm rain
- San Nicolás de los Arroyos in AugustArgentina · 59 kmHigh 17.8°C · Low 8.6°C · 56 mm rain
- Pergamino in AugustArgentina · 105 kmHigh 17.5°C · Low 7.4°C · 56 mm rain
- Paraná in AugustArgentina · 135 kmHigh 18.6°C · Low 9.2°C · 47 mm rain
- Santa Fe in AugustArgentina · 144 kmHigh 19.1°C · Low 9.4°C · 48 mm rain
- Venado Tuerto in AugustArgentina · 152 kmHigh 17.8°C · Low 7.4°C · 36 mm rain
- Junín in AugustArgentina · 185 kmHigh 17.2°C · Low 7.0°C · 45 mm rain
- Zárate in AugustArgentina · 197 kmHigh 17.2°C · Low 7.5°C · 69 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.