Climate and monthly weather forecastRosario, Argentina
Climate and monthly weather forecast
The climate of Rosario
Rosario, located in Argentina, experiences a Humid Subtropical climate with no dry season, tracked as 'Cfa' within the Köppen climate classification system. The city experiences considerable weather variation throughout the year, with changes in temperature, humidity, rainfall, and sunshine hours evidencing this.Throughout the year, high temperatures range from 15.7°C (60.3°F) in July to 33.4°C (92.1°F) in January, showcasing the summer's intensity. Low temperatures are not too severe, fluctuating between 7.5°C (45.5°F) in July and 18.8°C (65.8°F) in January. The relative humidity in the city varies from 52% in January to a higher 75% in May, typically when the air tends to feel most humid.
Rainfall in Rosario ranges from a low of 16mm (0.63") in June to a high of 72mm (2.83") in December. The number of rainy days varies from as low as 4.8 in June to a high of 10 in October. December brings the maximum rainfall, with an average of 9.1 rainy days. The UV index ranges from a low of 4 from April to September to a high of 7 in January, indicating the need for protection from potential sun exposure.
Both wind speed and gusts are generally mild, with wind traveling between 10.2km/h (6.3mph) to 13km/h (8.1mph) and gusts with a maximum speed of 21.3km/h (13.2mph) in August. Cloud cover in Rosario ranges from a low of 17% in January to a high of 37% in May.
The best time to visit Rosario
Considering the weather elements and typical visitor preferences, the best time to visit Rosario is between April and June. During these months, the region experiences mild weather and may be more attractive for outdoor activities. The temperatures are moderate, ranging from the high of 28.3°C (82.9°F) to 19.6°C (67.3°F), with a low between 15.6°C (60.1°F) and 11.7°C (53.1°F).Daily sunshine hours are reasonable, between 7.4 hours to 8.9 hours, providing ample time for sightseeing. Relative humidity does increse from 62% to 75%, indicative of an uptick in moisture. Those sensitive to humidity should be prepared for these conditions.
The worst time to visit Rosario
The summer months of January and February might be quite challenging for some visitors due to the high temperatures that can reach up to 33.4°C (92.1°F) accompanied by relatively higher humidity levels of 52% to 58%. These conditions could result in discomfort, especially for people not accustomed to such weather.During December, the city receives the maximum rainfall of 72mm (2.83") over about 9.1 days. This measure could disrupt outdoor activities and sightseeing schedules, making December less suitable for tourists who prefer to stay dry.
Spring weather in Rosario
The spring season in Rosario, occurring from September to November, is filled with warm, sunny weather. Daytime high temperatures range from 20.6°C (69.1°F) to 28.5°C (83.3°F), ensuring pleasant weather for outdoor activities. However, evenings are cooler with a range between 9.7°C (49.5°F) to 15.3°C (59.5°F).The city enjoys around eight hours of sunshine per day during spring, and the UV index is usually at a safe level of around 5 during October and 6 in November. Tourists during this season should expect around 34mm (1.34") to 53mm (2.09") of rain spread over about 7.5 to 8.9 days.
Summer weather in Rosario
Summer in Rosario, spanning from December to February, is characterized by high temperatures and frequent rainfall. The daytime high temperature can soar up to 33.4°C (92.1°F) in January, and night temperatures remain warm between 17.5°C (63.5°F) to 18.8°C (65.8°F).Rainfall is a common occurrence during summer months with approximately 45mm (1.77") to 72mm (2.83") falling over 7.8 to 9.1 days. Despite the rainfall, Rosario enjoys a significant amount of sunshine, averaging between 11.1 hours to 9.5 hours per day.
Autumn weather in Rosario
Autumn in Rosario, which extends from March to May, is mild and characterized by decreasing temperatures. With daytime highs moving from 24.5°C (76.1°F) to 19.6°C (67.3°F) and low temperatures decreasing from 13.8°C (56.8°F) to 11.7°C (53.1°F), the season offers relief from the high summer heat.Rainfall decreases from 35mm (1.38") in March to 23mm (0.91") in May spread over approximately seven to eight rainy days. While the hours of sunshine gradually lessen from 8.4 hours to 7.4 hours, the level of UV radiation also declines to a safer zone during this season.
Winter weather in Rosario
Winter season in Rosario, which stretches from June to August, witnesses the lowest temperatures of the year. The highs range from 15.7°C (60.3°F) to 18.8°C (65.8°F) while the lows vary between 7.5°C (45.5°F) to 8.7°C (47.7°F).Despite being the coldest part of the year, Rosario's winter is less rainy, with precipitation levels declining to 16mm (0.63") in June, then slightly increasing to 21mm (0.83") in July and 28mm (1.1") in August. Over these months, the people of Rosario experience the longest nights but still manage to enjoy roughly nine hours of daily sunshine. Nonetheless, it's worth noting that the strength of UV radiation remains consistently lower at 4.
Weather in January
The year in Rosario starts off with January being one of the warmest months, with daily highs peaking at 33.4°C (92.1°F). Typically, the day extends to 14 hours of daylight filled primarily with sunshine. Sunlight is radiated for nearly two-thirds of the day, generating a UV index of 7, necessitating appropriate protective measures for outdoor activities. Weather in January »Weather in February
As the atmosphere settles following the heat wave of January, February offers slightly cooler weather conditions in Rosario. Compared to its predecessor, February exhibits a slight dip in temperatures and comes in a bit windy with wind speeds maxing out at 11km/h (6.8mph). Weather in February »Weather in March
In March, the weather takes a gentle turn towards mild conditions as Rosario inches closer to autumn. The city witnesses a further drop in temperatures and also in rainfall quantities. Notably, the length of the day drops to about 12.3 hours, signalling the shorter days of the year ahead. Weather in March »Weather in April
April is when Rosario firmly steps into autumn. The weather becomes noticeably cooler, and the city experiences a consistent increase in relative humidity. Accompanying the cool breeze are showers, though the volume of rain is lesser compared to the initial months of the year. Weather in April »Weather in May
May signals the onset of cooler months in Rosario, as both day and night temperatures continue their descent. Relative to the previous months, the daylight hours keep shrinking but the city still witnesses about 10.4 hours of day time. Weather in May »Weather in June
June presents Rosario with the typical winter weather, characterized by lower temperatures and shorter days. The wind speed hits a new high this year, reaching up to 12.8km/h (8mph), adding to the perceived cold. As a result of the shortened days, there’s a decline in the number of sunshine days. Weather in June »Weather in July
July depicts the coldest weather in Rosario with temperatures barely making it above 15.7°C (60.3°F), a significant drop from earlier months. Even winters in Rosario are not devoid of sunshine, as the town still manages to get 7.5 hours of sunshine. Weather in July »Weather in August
August presents a slightly warmer Rosario as the city slowly shakes off the winter chill. The temperatures begin to rise and the length of the day starts to increase as well. The month overall remains dry, with only a moderate amount of rainfall. Weather in August »Weather in September
In September, the tables are turned as Rosario transitions to a warmer climate signalling the beginning of spring. Relative to the previous months, changes in temperature and rainfall quantities can be observed. The length of the day inches closer to the 12-hour mark, yielding longer sunny periods. Weather in September »Weather in October
October in Rosario is pleasantly warm, and the city finds itself experiencing longer days and shorter nights. Comparatively warmer than September, October still enjoys a substantial amount of sunlight. The rainfall volume experiences a slight increase, adding to the favourable weather conditions. Weather in October »Weather in November
November ushers in a hotter climate in Rosario with notable rise in temperatures. It also sees a significant boost in daylight hours, leading to more sunny days. This month also witnesses a substantial increase in both the volume and frequency of rainfall. Weather in November »Weather in December
December brings full-blown summer to Rosario with the hottest weather of the year featuring temperatures reaching 31.7°C (89.1°F). The longest days of the year are recorded in this month, with day time reaching a maximum of 14.3 hours. Weather in December »Updated: Jan 25, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, recognised by an average high temperature of 33.4°C (92.1°F) and a low of 18.8°C (65.8°F), is Rosario's warmest month.
The least humid month in Rosario is January, with an average relative humidity of 52%.
In Rosario, during the entire year, the rain falls for 89.9 days and collects up to 475mm (18.7") of precipitation.
The month with the highest UV index in Rosario, Argentina, is January, with an average maximum UV index of 7.
The months with the lowest UV index in Rosario, Argentina, are April through September, with an average maximum UV index of 4.
With an average relative humidity of 75%, May is the most humid month in Rosario.
With an average of 7.4h of sunshine, May has the least sunshine of the year.
The month with the least rainfall in Rosario, Argentina, is June, when the rain falls for 4.8 days and typically collects 16mm (0.63") of precipitation.
The month with the shortest days is June, with an average of 10h and 0min of daylight.
Rosario's July weather, with an average high temperature of 15.7°C (60.3°F) and an average low temperature of 7.5°C (45.5°F), tends to be the coldest of the year.
The month with the most rainfall is December, when the rain falls for 9.1 days and typically aggregates up to 72mm (2.83") of precipitation.
With an average of 14h and 18min of daylight, December has the longest days of the year.
Rosario does not utilize Daylight Saving Time (DST). -03 timezone is used throughout the entire year.
The month with the most sunshine in Rosario is December, with an average of 11.1h of sunshine.
Average temperature
Rosario, Argentina
The warmest month (with the highest average high temperature) is January (33.4°C).
The month with the lowest average high temperature is July (15.7°C).
The month with the highest average low temperature is January (18.8°C).
The coldest month (with the lowest average low temperature) is July (7.5°C).
Average pressure
Rosario, Argentina
- Average pressure in January:
1010.3mbar - Average pressure in February:
1011mbar - Average pressure in March:
1013.5mbar - Average pressure in April:
1015.8mbar - Average pressure in May:
1017.3mbar - Average pressure in June:
1017.9mbar
- Average pressure in July:
1019mbar - Average pressure in August:
1018mbar - Average pressure in September:
1017mbar - Average pressure in October:
1014.4mbar - Average pressure in November:
1011.6mbar - Average pressure in December:
1009.6mbar
The month with the highest atmospheric pressure is July (1019mbar).
The month with the lowest atmospheric pressure is December (1009.6mbar).
Average wind speed
Rosario, Argentina
- Average wind speed in January:
10.9km/h - Average wind speed in February:
10.3km/h - Average wind speed in March:
10.2km/h - Average wind speed in April:
10.9km/h - Average wind speed in May:
11.2km/h - Average wind speed in June:
12km/h
- Average wind speed in July:
12.3km/h - Average wind speed in August:
13km/h - Average wind speed in September:
13km/h - Average wind speed in October:
12.7km/h - Average wind speed in November:
12km/h - Average wind speed in December:
10.9km/h
The windiest months (with the highest average wind speed) are August and September (13km/h).
The calmest month (with the lowest average wind speed) is March (10.2km/h).
Average humidity
Rosario, Argentina
The month with the highest relative humidity is May (75%).
The month with the lowest relative humidity is January (52%).
Average rainfall
Rosario, Argentina
The wettest month (with the highest rainfall) is December (72mm).
The driest month (with the least rainfall) is June (16mm).
Average rainfall days
Rosario, Argentina
- Average rainfall days in January:
7.8 days - Average rainfall days in February:
7.8 days - Average rainfall days in March:
7.4 days - Average rainfall days in April:
8 days - Average rainfall days in May:
6.9 days - Average rainfall days in June:
4.8 days
- Average rainfall days in July:
6.6 days - Average rainfall days in August:
5.1 days - Average rainfall days in September:
7.5 days - Average rainfall days in October:
10 days - Average rainfall days in November:
8.9 days - Average rainfall days in December:
9.1 days
The month with the highest number of rainy days is October (10 days).
The month with the least rainy days is June (4.8 days).
Average daylight / Average sunshine
Rosario, Argentina
- Average daylight in January:
14h and 0min - Average daylight in February:
13h and 18min - Average daylight in March:
12h and 18min - Average daylight in April:
11h and 18min - Average daylight in May:
10h and 24min - Average daylight in June:
10h and 0min
- Average daylight in July:
10h and 12min - Average daylight in August:
10h and 54min - Average daylight in September:
11h and 54min - Average daylight in October:
12h and 54min - Average daylight in November:
13h and 48min - Average daylight in December:
14h and 18min
The month with the longest days is December (Average daylight: 14h and 18min).
The month with the shortest days is June (Average daylight: 10h and 0min).
- Average sunshine in January:
9h and 30min - Average sunshine in February:
8h and 54min - Average sunshine in March:
8h and 54min - Average sunshine in April:
8h and 24min - Average sunshine in May:
7h and 24min - Average sunshine in June:
7h and 36min
- Average sunshine in July:
7h and 30min - Average sunshine in August:
8h and 12min - Average sunshine in September:
8h and 0min - Average sunshine in October:
8h and 6min - Average sunshine in November:
10h and 18min - Average sunshine in December:
11h and 6min
The month with the most sunshine is December (Average sunshine: 11h and 6min).
The month with the least sunshine is May (Average sunshine: 7h and 24min).
Average sunshine days
Rosario, Argentina
- Average sunshine days in January:
22.8 days - Average sunshine days in February:
19.8 days - Average sunshine days in March:
22.3 days - Average sunshine days in April:
21.4 days - Average sunshine days in May:
22.3 days - Average sunshine days in June:
23.9 days
- Average sunshine days in July:
23.2 days - Average sunshine days in August:
24.3 days - Average sunshine days in September:
21.4 days - Average sunshine days in October:
19.7 days - Average sunshine days in November:
20.1 days - Average sunshine days in December:
20.7 days
The month with the most sunshine days is August (24.3 days).
The month with the least sunshine days is October (19.7 days).
Average UV index
Rosario, Argentina
The month with the highest UV index is January (UV index 7).
The months with the lowest UV index are April, May, June, July, August and September (UV index 4).
Average cloud cover
Rosario, Argentina
The month with the most cloud cover is May (Cloud cover 37).
The month with the least cloud cover is January (Cloud cover 17).
Average visibility
Rosario, Argentina
The months with the highest visibility are January, February, March, June and December (10km).
The months with the lowest visibility are April, May, July, August, September, October and November (9km).
