September weather forecast
Rosario, Argentina

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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. The wind speed dips slightly compared to preceding months. As we stride into October, warmer days are on the horizon.

Temperature

September's commencement in Rosario is accompanied by an average high-temperature of a pleasant 20.6°C (69.1°F), diverging marginally from August's 18.8°C (65.8°F). Rosario experiences an average low-temperature of 9.7°C (49.5°F) in the month of September.

Humidity

In September, the average relative humidity in Rosario, Argentina, is 71%.

Rainfall

In Rosario, in September, it is raining for 7.5 days, with typically 34mm (1.34") of accumulated precipitation. Throughout the year, there are 89.9 rainfall days, and 475mm (18.7") of precipitation is accumulated.

Daylight

In September, the average length of the day is 11h and 55min.
On the first day of the month, sunrise is at 07:19 and sunset at 18:45. On the last day of September, in Rosario, Argentina, sunrise is at 06:40 and sunset at 19:04 -03.

Sunshine

In September, the average sunshine is 8h.

UV index

The months with the lowest UV index in Rosario, Argentina, are April through September, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.
Note: A maximum daily UV index of 4 during September morphs into the following directions:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.

Frequently asked questions

What are the temperatures in Rosario in September?

In September, the average high-temperature and low-temperature in Rosario are 20.6°C (69.1°F) and 9.7°C (49.5°F) respectively. In March, the average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is computed to be 30°C (86°F).

What is the average humidity in September in Rosario?

In September, the average relative humidity is 71%.

How many days does it rain in September in Rosario?

In Rosario, in September, during 7.5 rainfall days, 34mm (1.34") of precipitation is typically accumulated.

What is the average length of the day in September in Rosario?

In Rosario, the average day length in September is 11h and 55min.

What time are sunrise and sunset in September in Rosario?

In September, on the first day of the month, sunrise is at 07:19 and sunset at 18:45. On the last day of the month, sunrise is at 06:40 and sunset at 19:04 -03.

How long on average sun shines in September in Rosario?

In Rosario, the average sunshine duration in September is 8h.

What are the months with the lowest UV index in Rosario?

The months with the lowest UV index in Rosario are April through September, with an average maximum UV index of 4.

What is the UV index intensity in September in Rosario?

In September, the average daily maximum UV index in Rosario is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.

Average temperature in September
Rosario, Argentina

Average temperature in September - Rosario, Argentina
  • Average high temperature in September: 20.6°C

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).

  • Average low temperature in September: 9.7°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 in September
Rosario, Argentina

Average pressure in September - Rosario, Argentina
  • Average pressure in September: 1017mbar

The month with the highest atmospheric pressure is July (1019mbar).
The month with the lowest atmospheric pressure is December (1009.6mbar).

Average wind speed in September
Rosario, Argentina

Average wind speed in September - Rosario, Argentina
  • Average wind speed in September: 13km/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 in September
Rosario, Argentina

Average humidity in September - Rosario, Argentina
  • Average humidity in September: 71%

The month with the highest relative humidity is May (75%).
The month with the lowest relative humidity is January (52%).

Average rainfall in September
Rosario, Argentina

Average rainfall in September - Rosario, Argentina
  • Average rainfall in September: 34mm

The wettest month (with the highest rainfall) is December (72mm).
The driest month (with the least rainfall) is June (16mm).

Average rainfall days in September
Rosario, Argentina

Average rainfall days in September - Rosario, Argentina
  • Average rainfall days in September: 7.5 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 in September /
Average sunshine in September
Rosario, Argentina

Average daylight in September / Average sunshine in September - Rosario, Argentina
  • Average daylight in September: 11h and 5min

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 September: 8h and 0min

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 in September
Rosario, Argentina

Average sunshine days in September - Rosario, Argentina
  • Average sunshine days in September: 21.4 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 in September
Rosario, Argentina

Average UV index in September - Rosario, Argentina
  • Average UV index in September: 4

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 in September
Rosario, Argentina

Average cloud cover in September - Rosario, Argentina
  • Average cloud cover in September: 29

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 in September
Rosario, Argentina

Average visibility in September - Rosario, Argentina
  • Average visibility in September: 9km

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).

Rosario, Argentina

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