Best time to visit Rosario

August is the best month in Rosario, scoring 89 out of 100, with January the weakest at 52. The 37-point spread means timing is worth planning around without being decisive. The good window runs April to September — 6 months within ten points of the best.

January is the warmest month at 32.9 °C and July the coolest at 16.5 °C — a 16.4 °C spread across the year. Around 91 days a year top 30 °C, concentrated in January and the months either side. 5 nights a year dip below freezing.

There is a real wet season here. January, February, March, October and December carry the rain — up to 11 wet days in a month — while June to August drop as low as 3. That 8-day gap is the biggest single difference between a good month and a bad one in Rosario, and it moves further than the temperature does.

Daylight runs from 10 hours in winter to 14.3 in summer, enough to notice on a sightseeing itinerary.

The three strongest months are August, September, May. The one to think twice about is January. Each month below has its own page with rainfall reliability, extremes, daylight and crowd levels.

Rosario month by month