Weather in Rosario in August
Argentina · 20-year averages, August
Prime time. August is about as good as Rosario gets. Highs average 19 °C, lows 6.3 °C, and rain falls on 4 days — nothing in the month is working against you.
August is the highest-scoring month of the twelve. The nearest rival is September, and the month at the other end of the year is January.
Rain falls on only 4 days, so an itinerary with no wet-weather fallback is a reasonable risk. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.
What the averages hide
The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest August day reached 34.4 °C and the coldest night fell to -3.1 °C, and the wettest single day dropped 78 mm — roughly 205% of the month's rain in one day.
This is the volatile part. August rainfall has ranged from 1 mm to 144 mm across the twenty years measured — a 143 mm spread around an average of 38 mm. The average is real but almost no individual August looks like it, so treat the figure as the middle of a wide range rather than a forecast.
Wind is light at 8.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 74%.
How August sits in the year
The month is on the way up: 2.5 °C warmer than July, and September adds another 3 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.
Daylight in August
10.9 hours of daylight, gaining 0.8 hours across the month. That is between Rosario's extremes of 14.3 and 10 hours, so days are long enough not to constrain the plan.
An inland climate
With no coast nearby, the year swings a fair way — 27.9 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.
How busy it gets
Peak season. Expect the highest prices of the year and to be booking well ahead.
Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.
August in Rosario versus nearby
If Rosario is one option among several, the nearby comparison is worth making. Buenos Aires is the weaker option in August — 4 °C cooler, 3 days more rain. Córdoba is a better bet in August — 4.2 °C warmer, 3 days less rain.
So: August is the answer for Rosario. If it is booked out or priced out, September is the next best thing at 1 points behind, and January is the month to keep off the shortlist.
Every month in Rosario
| Month | High °C | Low °C | Rain days | Rain mm | Humidity % | Daylight h | Score |
|---|---|---|---|---|---|---|---|
| January | 32.9 | 19 | 10 | 123 | 61 | 14.1 | 52 |
| February | 30.9 | 18.1 | 10 | 139 | 67 | 13.3 | 59 |
| March | 28.3 | 15.7 | 10 | 148 | 71 | 12.3 | 73 |
| April | 24.1 | 12.3 | 9 | 111 | 75 | 11.3 | 80 |
| May | 19.7 | 9 | 6 | 52 | 80 | 10.5 | 87 |
| June | 17 | 5.9 | 3 | 22 | 80 | 10 | 84 |
| July | 16.5 | 5 | 4 | 26 | 78 | 10.2 | 81 |
| August | 19 | 6.3 | 4 | 38 | 74 | 10.9 | 89 |
| September | 22 | 8.5 | 6 | 58 | 69 | 11.8 | 88 |
| October | 25.5 | 11.7 | 10 | 123 | 68 | 12.9 | 78 |
| November | 29.1 | 14.8 | 9 | 109 | 63 | 13.8 | 72 |
| December | 31.5 | 17 | 11 | 142 | 60 | 14.3 | 57 |
See all twelve months in Rosario, or where else to go in August.
Planning the rest of the trip
- Flight time to Rosario how long you are actually in the air
- Rosario time zone and the difference from home
- Days until your trip count down to the departure date