Rosario weather in December
December in Rosario: hot, a little rain, with clean air — an excellent time to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#9 of 12 months in Rosario · #437 of 1413 destinations to visit in December · comfort 81/100 (tier A)
- Days
- 31°C
- Nights
- 17°C
- Wet days
- 8
- Sun
- 11.9 h
- Humidity
- 58%
- Daylight
- 14 h
Traveller notes on Rosario in December
Other months in Rosario
Forum posters specifically recommend March or April for visiting Rosario, describing the weather then as noticeably more comfortable than the hotter January-February stretch. Posters more broadly rate March and April as beautiful months for travel across Argentina generally, with April weather described as delightful. Posters consistently describe Rosario itself as a kind of mini Buenos Aires - chic, attractive, and centered on a scenic riverfront rambla worth strolling for its parks, river views and upscale apartment buildings. Posters generally rate two to three days as enough time to enjoy the city, with April's milder temperatures adding real appeal to that recommendation.
Forum posters describe October as squarely inside Argentina's pleasant spring stretch - sunny, not too hot and not too wet, with the city's parks and gardens in full bloom. One recurring regional comparison posters make: Rosario runs noticeably more humid than nearby Cordoba, which is comparatively dry, though both cities get genuinely hot come summer. Posters recommend budgeting two to three days for Rosario itself, and specifically flag March/April and, by extension, the similarly mild October window as better timing than the peak-summer months of January/February when the heat becomes properly oppressive along the Parana riverfront.
Add your own note from Rosario's card on the map.
Rosario climate normals — December
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Rosario in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsRiver season on the Parana, Christmas and New Year, Summer holidays in Argentina(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Rosario's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherRosario's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in Rosario in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
River season on the Parana
15 Nov – 15 Mar · usuallySummer season opensCrowdedThe balnearios along the north bank open and the launches start running to the sandbank beaches on the island side. It is the only time of year the city faces its river properly.
- Holiday
Christmas and New Year
24 Dec – 1 JanChristmas & New YearClosuresArgentines celebrate at midnight on 24 and 31 December with family dinners and fireworks. Shops close early on those evenings, and on 25 December and 1 January almost everything is shut, including many restaurants. Source ↗
Nearby, and something's on
Within 300 km of Rosario — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Rosario?
Rosario in December — FAQ
- Is December a good time to visit Rosario?
- December in Rosario: hot, a little rain, with clean air — an excellent time to visit. It ranks #9 of 12 months for Rosario on SeasonMap's comfort score (81/100).
- What is the weather like in Rosario in December?
- In December, Rosario averages a daily high of 31.3°C and a low of 17.2°C, with about 74.4 mm of rain over roughly 7.6 rainy days.
- What is the air quality in Rosario in December?
- Rosario has a mean US Air Quality Index of about 30 in December.
Within 300 km: Buenos Aires' January summer shutdown around 24 Dec – 1 Feb.