September weather forecast
Montevideo, Uruguay

Beautiful lawns and palm trees in the independence square outside the Centrally placed Salvo Palace in Montevideo, Uruguay
Beautiful lawns and palm trees in the independence square outside the Centrally placed Salvo Palace in Montevideo, Uruguay

Weather in September

September, the first month of the spring in Montevideo, is still a comfortable month, with temperature in the range of an average low of 9.1°C (48.4°F) and an average high of 18°C (64.4°F).

Temperature

In Montevideo, the average high-temperature in September is practically the same as in August - a still comfortable 18°C (64.4°F). In September, in Montevideo, the average low-temperature is 9.1°C (48.4°F).

Humidity

In Montevideo, the average relative humidity in September is 74%.

Rainfall

In Montevideo, Uruguay, during 6 rainfall days, 93.9mm (3.7") of precipitation is typically accumulated. Throughout the year, in Montevideo, Uruguay, there are 77 rainfall days, and 1101.2mm (43.35") of precipitation is accumulated.

Sea temperature

In September, the average sea temperature is 13.3°C (55.9°F).
Note: Swimming in 13.3°C (55.9°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In Montevideo, Uruguay, the average length of the day in September is 11h and 53min.
On the first day of September, sunrise is at 07:03 and sunset at 18:25. On the last day of the month, sunrise is at 06:22 and sunset at 18:47 -03.

Sunshine

In Montevideo, the average sunshine in September is 6.1h.

UV index

In Montevideo, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in Montevideo?

In September, the average relative humidity in Montevideo, Uruguay, is 74%.

How many days does it rain in September in Montevideo?

In Montevideo, during September, the rain falls for 6 days and regularly aggregates up to 93.9mm (3.7") of precipitation.

How cold is the water in September in Montevideo?

In Montevideo, the average seawater temperature in September is 13.3°C (55.9°F). Swimming in 13.3°C (55.9°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Montevideo have in September?

In Montevideo, Uruguay, the average day length in September is 11h and 53min.

When are sunrise and sunset in September in Montevideo?

In September, on the first day of the month, sunrise is at 07:03 and sunset at 18:25. On the last day of the month, in Montevideo, sunrise is at 06:22 and sunset at 18:47 -03.

How many hours of sunshine does Montevideo have in September?

In September, the average sunshine duration is 6.1h.

What is the UV index intensity in September in Montevideo?

In Montevideo, Uruguay, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.

Average temperature in September
Montevideo, Uruguay

Average temperature in September - Montevideo, Uruguay
  • Average high temperature in September: 18°C

The warmest month (with the highest average high temperature) is January (28.4°C).
The month with the lowest average high temperature is July (15°C).

  • Average low temperature in September: 9.1°C

The month with the highest average low temperature is January (18°C).
The coldest month (with the lowest average low temperature) is July (7.2°C).

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Average humidity in September
Montevideo, Uruguay

Average humidity in September - Montevideo, Uruguay
  • Average humidity in September: 74%

The month with the highest relative humidity is June (82%).
The month with the lowest relative humidity is December (67%).

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Average rainfall in September
Montevideo, Uruguay

Average rainfall in September - Montevideo, Uruguay
  • Average rainfall in September: 93.9mm

The wettest month (with the highest rainfall) is October (108.5mm).
The driest month (with the least rainfall) is June (83.1mm).

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Average rainfall days in September
Montevideo, Uruguay

Average rainfall days in September - Montevideo, Uruguay
  • Average rainfall days in September: 6 days

The months with the highest number of rainy days are February, June, July, October and November (7 days).
The months with the least rainy days are January, March, April, May, August, September and December (6 days).

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Average sea temperature in September
Montevideo, Uruguay

Average sea temperature in September - Montevideo, Uruguay
  • Average sea temperature in September: 13.3°C

The best month for swimming (with the highest average sea temperature) is January (24.2°C).
The coldest month (with the lowest average sea temperature) is July (11.3°C).

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Average daylight in September /
Average sunshine in September
Montevideo, Uruguay

Average daylight in September / Average sunshine in September - Montevideo, Uruguay
  • Average daylight in September: 11h and 53min

The month with the longest days is December (Average daylight: 14h and 28min).
The month with the shortest days is June (Average daylight: 9h and 51min).

  • Average sunshine in September: 6.1h

The month with the most sunshine is January (Average sunshine: 9.5h).
The month with the least sunshine is June (Average sunshine: 4.3h).

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Average UV index in September
Montevideo, Uruguay

Average UV index in September - Montevideo, Uruguay
  • Average UV index in September: 6

The months with the highest UV index are January and December (UV index 12).
The months with the lowest UV index are June and July (UV index 2).

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