Montevideo
Uruguay
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
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
The first month of the spring, September, is also an enjoyable month in Montevideo, Uruguay, with average temperature varying between 18°C (64.4°F) and 9.1°C (48.4°F).

Temperature

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

Humidity

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

Rainfall

In Montevideo, it is raining for 6 days, with typically 93.9mm (3.7") of accumulated precipitation. In Montevideo, during the entire year, the rain falls for 77 days and collects up to 1101.2mm (43.35") of precipitation.

Sea temperature

In Montevideo, the average water 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, the average length of the day in September is 11.9h.

Sunshine

The average sunshine in Montevideo is 6.1h.

UV index

The average daily maximum UV index in Montevideo, Uruguay, is 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to the UV radiation for the average person.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Montevideo?

In Montevideo, in September, the average high-temperature is 18°C (64.4°F), and the average low-temperature is 9.1°C (48.4°F).

What is the average humidity in September in Montevideo?

The average relative humidity in September in Montevideo is 74%.

How many days does it rain in September in Montevideo?

In September, the rain falls for 6 days. Throughout September, 93.9mm (3.7") of precipitation is accumulated.

What is the sea water temperature in September in Montevideo?

In Montevideo, in September, the average water temperature 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.

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

In Montevideo, Uruguay, the average length of the day in September is 11.9h.

How many hours of sunshine does Montevideo have in September?

The average sunshine in September in Montevideo, Uruguay, is 6.1h.

What is the UV index intensity in September in Montevideo?

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation.
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).

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%).

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 lowest rainfall) is June (83.1mm).

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

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

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).

Average daylight in September / Average sunshine in September - Montevideo, Uruguay
  • Average daylight in September: 11.9h

The month with the longest days is December (Average daylight: 14.5h).
The month with shortest days is June (Average daylight: 9.8h).

  • Average sunshine in September: 6.1h

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

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

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