September weather forecast
Cusco, Peru

September marks a gradual transition from the dry to the wet season in Cusco, Peru. Rainfall starts to rise, but remains relatively low at 22mm (0.87"), reserved for a minor 7 days in the month. As the return of the rainy season becomes more evident, there's a noticeable rise in humidity. Nevertheless, the weather remains comfortable for exploring local attractions, ensuring Cusco remains a popular stop for tourists. Although the UV index begins to drop, protection against sun exposure is still advised.

Temperature

The unfolding of September in Cusco shows an average high-temperature of a pleasant 20.1°C (68.2°F), indicating a slight variance from August's 19.9°C (67.8°F). Cusco registers a significant drop in temperature in September, with average nighttime lows of 4°C (39.2°F).

Humidity

In Cusco, the average relative humidity in September is 51%.

Rainfall

In September, in Cusco, the rain falls for 7 days. Throughout September, 22mm (0.87") of precipitation is accumulated. In Cusco, during the entire year, the rain falls for 102 days and collects up to 708mm (27.87") of precipitation.

Daylight

The average length of the day in September is 12h and 2min.
On the first day of September in Cusco, sunrise is at 05:51 and sunset at 17:43. On the last day of the month, sunrise is at 05:31 and sunset at 17:44 -05.

Sunshine

In September, the average sunshine is 6.5h.

UV index

The months with the highest UV index in Cusco are January through April, August through December, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the maximum UV index of 12 suggests these recommendations:
Enforce all necessary safety measures, unprotected skin may suffer burns swiftly. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.