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

A minimal variation is noted in Montevideo's average high-temperature at the onset of September, reaching a still refreshing 18°C (64.4°F) from August's 16.2°C (61.2°F). Montevideo reports a consistent average low-temperature of 9.1°C (48.4°F) throughout September nights.

Humidity

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

Rainfall

In September, the rain falls for 6 days. Throughout September, 94mm (3.7") of precipitation is accumulated. In Montevideo, Uruguay, 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: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

Daylight

The average length of the day in September 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, in Montevideo, sunrise is at 06:21 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 value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 6 suggests these recommendations:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.