Rosario, Argentina climate

Cfa Humid subtropical

Rosario has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is January with an average daily high near 32°C, while the coldest is July averaging around 4°C at night. Precipitation totals about 1067 mm a year and is strongly seasonal — March alone averages 145 mm while June barely receives 22 mm.

☀️ Summers

Hot

Highs near 32°C in January.

❄️ Winters

Chilly

Lows near 4°C in July.

🌧️ Rain

Wet

About 1067 mm of rain a year.

Wettest in March

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Rosario climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	32	30	28	25	21	18	17	20	22	25	28	31
Avg temp (°C)	25	24	22	19	15	12	11	13	16	19	22	24
Avg low (°C)	19	18	16	12	9	6	4	6	9	12	15	17
Precipitation (mm)	122	119	145	123	67	22	22	43	50	117	107	132

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	32	30	28	25	21	18
Avg temp (°C)	25	24	22	19	15	12
Avg low (°C)	19	18	16	12	9	6
Precipitation (mm)	122	119	145	123	67	22

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	17	20	22	25	28	31
Avg temp (°C)	11	13	16	19	22	24
Avg low (°C)	4	6	9	12	15	17
Precipitation (mm)	22	43	50	117	107	132

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	50	55	46	50	54	54	53	48	50	54	48	50
Relative humidity (%)	60	65	69	75	79	80	78	73	68	67	63	60
Wind speed (m/s)	2.0	2.0	1.9	2.0	2.0	2.1	2.2	2.3	2.4	2.4	2.4	2.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	50	55	46	50	54	54
Relative humidity (%)	60	65	69	75	79	80
Wind speed (m/s)	2.0	2.0	1.9	2.0	2.0	2.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	53	48	50	54	48	50
Relative humidity (%)	78	73	68	67	63	60
Wind speed (m/s)	2.2	2.3	2.4	2.4	2.4	2.2

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Rosario, a weather station, about 14 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →