September weather forecast
Montevideo, Uruguay

September, the dawn of Montevideo's spring exhibits warmer temperatures and extended sunshine hours. The sea temperature gradually increases to 13.3°C (55.9°F), inviting for enjoyable walks along the beaches. From a climatological perspective, a rise in rainfall to 94mm (3.7") can be seen. The gradually increasing daylight duration marks longer days, providing more time for outdoor explorations. A drop in humidity perfectly aligns with the comfortable weather spring offers.

Temperature

September's arrival in Montevideo brings an average high-temperature of a still comfortable 18°C (64.4°F), slightly deviating from August's 16.2°C (61.2°F). Throughout September, Montevideo encounters an average temperature drop to a chilly 9.1°C (48.4°F).

Humidity

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

Rainfall

In Montevideo, Uruguay, during September, the rain falls for 6 days and regularly aggregates up to 94mm (3.7") of precipitation. In Montevideo, during the entire year, the rain falls for 77 days and collects up to 1101mm (43.35") of precipitation.

Sea temperature

In Montevideo, in September, the average water temperature is 13.3°C (55.9°F).
Note: Dipping into 13.3°C (55.9°F) below 10°C (50°F) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 13°C (55.4°F) can be jarring.

Daylight

In September, the average length of the day in Montevideo is 11h and 53min.
On the first day of the month, sunrise is at 07:02 and sunset at 18:26. On the last day of September, sunrise is at 06:21 and sunset at 18:47 -03.

Sunshine

In September, the average sunshine is 6.1h.

UV index

In Montevideo, Uruguay, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 6 in September translates into this advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Employ a wide-brim hat for potent defense against up to 50% of UV rays.