September weather forecast
Peru

In September, Peru transitions into spring, bringing about gradual changes in weather across its varied regions. In the coastal region, cities such as Lima and Trujillo see the end of winter and the temperatures start to climb gradually with averages ranging from 16°C (60.8°F) to 22°C (71.6°F). The garúa, or coastal mist, begins to dissipate, and rainfall remains minimal, as is characteristic of this region.

In the Andean highlands, home to cities like Cusco and Arequipa, September still falls within the dry season, although it is nearing its end. Rainfall remains low, with average precipitation levels of about 20mm (0.79"). Daytime temperatures fluctuate between 10°C (50°F) to 20°C (68°F), while nighttime temperatures continue to drop close to freezing at higher altitudes.

Over in the Amazon rainforest, cities such as Iquitos and Puerto Maldonado begin to experience a gradual increase in rainfall. The average precipitation in September is around 120mm (4.72"), marking the end of the dry season and the beginning of the wetter months. Despite the increase in rainfall, temperatures remain consistently high, typically exceeding 30°C (86°F).

Comparing to August, September sees a slight increase in temperatures across all regions, particularly in the coastal area. Rainfall also begins to increase in the Amazon, indicating the end of the dry season. Looking forward to October, Peru continues its transition into spring with further increases in both temperatures and rainfall.

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• Lima - September »
  September is the month with the coldest seawater in Lima, with an average sea temperature of 15.8°C (60.4°F). The month with the coldest seawater in Lima is September, with an average sea temperature of 15.8°C (60.4°F).
• Arequipa - September »
  In September, in Arequipa, Peru, the rain falls for 2.7 days. September nights in Arequipa are marked by an average temperature drop to a frosty 7.7°C (45.9°F).
• Cusco - September »
  On the first day of September in Cusco, sunrise is at 05:51 and sunset at 17:43. 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).
• Trujillo - September »
  January through April, September through December, with an average maximum UV index of 12, are months with the highest UV index in Trujillo, Peru. Trujillo ushers in September with an average high-temperature of a still pleasant 20.5°C (68.9°F), showing a close resemblance to the previous month.
• Chiclayo - September »
  The months with the least rainfall in Chiclayo are August and September Rain falls for 2.2 days and accumulates 2mm (0.08") of rain. June through September, with an average relative humidity of 81%, are most humid months in Chiclayo, Peru.
• Iquitos - September »
  In Iquitos, Peru, during September, the rain falls for 21.5 days and regularly aggregates up to 80mm (3.15") of precipitation. August and September, with an average relative humidity of 77%, are the least humid months in Iquitos.
• Callao - September »
  September is the month with the coldest seawater in Callao with an average sea temperature of 15.8°C (60.4°F). In Callao during September, the rain falls for 1.5 days and regularly aggregates up to 1mm (0.04") of precipitation.
• Pucallpa - September »
  On the first day of September in Pucallpa sunrise is at 05:59 and sunset at 17:56. September proves to be the warmest month in Pucallpa, recording an average peak temperature of 33.1°C (91.6°F) and a minimum temperature of 20°C (68°F).
• Tacna - September »
  The months with the least rainfall in Tacna are June through September Rain falls for 1.1 days and accumulates 1mm (0.04") of rain. The months with the least rainfall in Tacna are June through September Rain falls for 1.1 days and accumulates 1mm (0.04") of rain.
• Chimbote - September »
  With an average sea temperature of 16.2°C (61.2°F), September is the month with the coldest seawater in Chimbote, Peru. With an average sea temperature of 16.2°C (61.2°F), September is the month with the coldest seawater in Chimbote, Peru.
• Ica - September »
  On the first day of September in Ica sunrise is at 06:07 and sunset at 17:58. As Ica steps into September, the trends of temperatures remain consistent with August, providing a seamless transition into the new month.