Last updated: August 27, 2025
September in Cusco, Peru offers a unique interplay of cool days and chilly nights, with average temperatures around 10°C (49°F), peaking at a comfortable 21°C (70°F) during the day. Visitors can expect the crisp highland air, especially as temperatures dip to a brisk -1°C (30°F) at night. With 34 mm (1.3 in) of precipitation spread over approximately 11 days, rain showers are a regular occurrence, contributing to the region's lush landscapes. The humidity levels hover around 51%, creating a refreshing environment that perfectly complements the vibrant culture and stunning scenery of this historical city.
In September, Cusco begins to transition into milder weather, offering a delightful mix of cool nights and pleasant days. The minimum temperature hovers around -1°C (30°F), rising to an average of 10°C (49°F), with daytime highs reaching up to 21°C (70°F). This slight warmth signals an end to winter's chilly grip, allowing visitors to explore the city's vibrant culture while enjoying the clear skies of early spring. Compared to the preceding months, September presents just a tad more warmth; the steady increase in temperatures from August's max of 20°C (68°F) suggests that the region is steadily adapting to the emerging season. This makes it an ideal time for trekking and immersing in the breathtaking landscapes that surround the historical city.
September in Cusco marks a gradual transition in precipitation, with 34 mm (1.3 in) of rain falling over 11 days. This slight increase in rainfall compared to the preceding months—where dry patterns dominated—is indicative of the region's shift towards the wetter season. While still relatively mild, September’s precipitation lays the groundwork for the more substantial downpours expected in the coming months, particularly as October sees a significant jump to 86 mm (3.4 in). The rising trend in both rainfall amount and frequency signals the onset of spring and foreshadows the lush landscapes that will soon envelop the iconic Andean city.
In September, humidity in Cusco, Peru, settles at a moderate 51%, marking a noticeable shift from the previous months. After a steep decline from a high of 94% in January down to a mere 44% in August, September brings a subtle increase, hinting at the gradual return of moisture as the dry season transitions. This trend showcases the region's dynamic climate, where humidity levels fluctuate significantly throughout the year. As Cusco approaches the final months of the year, an uptick in humidity to 64% in October suggests that the wet season is approaching, restoring the vibrancy of the lush landscapes that characterize this enchanting destination.
In September, Cusco, Peru, experiences a UV Index of 16, categorizing it as extreme and indicating a burn time of just 10 minutes. As the year progresses, there's a noticeable fluctuation in UV intensity, peaking in December with a staggering UV Index of 22, while the summer months consistently hover around 19. This trend underscores the necessity for sun protection year-round, particularly during these months where UVA and UVB exposure is heightened. Whether you're exploring the rich cultural landmarks or trekking the breathtaking landscapes, don't forget to stay safe under the sun! For more information on UV levels throughout the year, visit Cusco UV Index.
UV Risk Categories
As September rolls in, Cusco, Peru basks in a remarkable 325 hours of sunshine, continuing the streak of beautiful weather that peaks during the winter months. Following a surging increase since May, when the sun begins to shine brightly, the daylight hours remain abundant through August. Although September experiences a slight dip compared to its predecessor, it still offers plenty of golden rays, making it an ideal time for exploring the city's rich history and stunning surroundings. The trend of abundant sunshine in the latter half of the year sets a vibrant backdrop for both locals and travelers, highlighting the region's allure during these springtime months.
As September rolls in, the likelihood of sunny weather in Cusco, Peru, experiences a notable decline compared to the previous months. After enjoying peak sunshine in July and August, where the chances soared to 72% and 62%, respectively, September offers a more modest 31% chance of sun. This shift marks a transition into the latter part of the year, where cloud cover begins to creep back in, leading to an October forecast of only 19% sunshine. Despite this reduction, September retains a fairly favorable outlook for those visiting, showcasing Cusco's stunning landscapes under the warm rays of the late winter sun.
In September, Cusco, Peru experiences a delightful return to longer days, with 12 hours of daylight that echo the consistent brightness seen in the earlier months of the year, like January and February. As daylight begins to stretch after the shorter autumn months of April through August, this shift signifies the transition into spring in the Southern Hemisphere. The gradual increase in sunlight not only rejuvenates the landscape but also invites locals and visitors alike to explore the vibrant culture and breathtaking scenery of this historic city. Following the rhythm of the seasons, October and November will maintain this generous daylight, ensuring that Cusco remains a welcoming destination as the year progresses.
As September rolls into Cusco, the gentle caress of the wind picks up slightly, reaching an average speed of 1.3 m/s (3 mph). This marks a transition from the calmer breezes of the preceding months, where the wind remained consistently low, hovering around 1.0 to 1.1 m/s. The increase in wind speed during September aligns with the gradual shift from the dry season to the more variable weather of spring. This subtle uptick not only enhances the crispness in the air but also adds a refreshing backdrop for the bustling life of Cusco, inviting locals and travelers alike to embrace the city's vibrant atmosphere as they soak in the beauty of the surrounding landscapes.
Weather in Cusco varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Cusco, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January in Cusco present contrasting weather conditions. In September, temperatures range from a minimum of -1°C (30°F) to a maximum of 21°C (70°F), with an average of 10°C (49°F). This month experiences relatively low precipitation at 34 mm (1.3 in) over about 11 days, along with a moderate humidity level of 51%. In contrast, January sees slightly warmer temperatures, with a minimum of 2°C (35°F) and a maximum of 19°C (66°F), yet the average remains the same at 9°C (49°F). However, January is significantly wetter, with 170 mm (6.7 in) of precipitation spread across 23 days and a high humidity of 94%. For more detailed insights, check out Cusco weather in January.
September and February in Cusco exhibit notable differences in weather patterns. September experiences a milder climate with temperatures ranging from a minimum of -1°C (30°F) to a maximum of 21°C (70°F), alongside relatively low precipitation of 34 mm (1.3 in) falling over 11 days. In contrast, February is characterized by warmer temperatures, with lows around 3°C (37°F) and highs reaching 19°C (67°F). However, this month is significantly wetter, receiving 230 mm (9.1 in) of rainfall over 27 days, resulting in much higher humidity levels of 92%. For more detailed insights into February weather, check out Cusco weather in February.
September and March present contrasting weather patterns. In September, temperatures range from a minimum of -1°C (30°F) to a maximum of 21°C (70°F), with an average of 10°C (49°F). This month receives moderate precipitation of 34 mm (1.3 in) over approximately 11 days, resulting in a humidity level of 51%. In stark contrast, March tends to be warmer with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 19°C (66°F) and an average of 9°C (49°F). However, March is significantly wetter, with a total of 180 mm (7.1 in) of rainfall across 27 days and a high humidity level of 92%. For more information about the weather in March, you can check Cusco weather in March.
In comparing the weather conditions of September and April, it's clear that both months have their unique characteristics. September generally enjoys milder temperatures, with a minimum of -1°C (30°F) and a maximum of 21°C (70°F), while April's temperatures range from a minimum of 1°C (35°F) to a maximum of 18°C (64°F). Precipitation also plays a significant role; September receives 34 mm (1.3 in) of rain over approximately 11 days, whereas April sees a much higher total of 90 mm (3.5 in) spread over 20 days. Additionally, humidity levels in April are notably higher at 90%, compared to September's more comfortable 51%. For more detailed insights, you can check Cusco weather in April.
September and May exhibit distinct weather patterns, showcasing the transition between seasonal changes. In September, temperatures range from a minimum of -1°C (30°F) to a maximum of 21°C (70°F), with an average of 10°C (49°F). The month sees 34 mm (1.3 in) of precipitation over 11 days, and the humidity levels are at a moderate 51%. In contrast, May experiences slightly cooler temperatures, with a minimum of -2°C (28°F) and a maximum of 17°C (63°F), averaging 9°C (48°F). May also has less precipitation, totaling 30 mm (1.2 in) over 10 days, but the humidity is notably higher at 88%. For a more detailed look at the weather during this time, you can visit Cusco weather in May.
In comparing the weather of September and June, we find notable differences in temperature, precipitation, and humidity. September offers a wider temperature range with minimums of -1°C (30°F), an average of 10°C (49°F), and maximums reaching 21°C (70°F). In contrast, June presents a slightly cooler profile, with minimums at -1°C (30°F), an average of 9°C (48°F), and maximums of only 18°C (65°F). Additionally, September experiences more precipitation at 34 mm (1.3 in) spread over 11 days, whereas June sees just 15 mm (0.6 in) over only 3 days. Humidity levels are also significantly higher in June, sitting at 77%, compared to September's 51%. For more details on June weather specifics, visit Cusco weather in June.
In comparing the weather between September and July, September generally experiences milder temperatures, with an average of 10°C (49°F) compared to July's average of 8°C (47°F). Notably, September's maximum temperature reaches up to 21°C (70°F), whereas July only sees a maximum peak of 19°C (66°F). Additionally, September has slightly more precipitation, totaling 34 mm (1.3 in) over 11 days, while July records only 19 mm (0.7 in) across 4 days. Humidity levels are also moderately different, with September at 51% and July a bit higher at 55%. For more specific insights on July weather, you can visit Cusco weather in July.
In September, the weather in Cusco is milder compared to August, with average temperatures rising to 10°C (49°F), peaking at a maximum of 21°C (70°F). In contrast, August experiences slightly cooler temperatures, with an average of 9°C (48°F) and a maximum of 20°C (68°F). While both months see a fair amount of precipitation, September has a higher total of 34 mm (1.3 in) over 11 days, compared to August's 21 mm (0.8 in) spread over just 7 days. Additionally, September's humidity is slightly higher at 51%, compared to 44% in August, making the air feel a bit more damp. For more insights on August weather in Cusco, visit Cusco weather in August.
In September, temperatures in Cusco range from a chilly -1°C (30°F) to a mild 21°C (70°F), with an average of 10°C (49°F). The month sees relatively light precipitation, totaling 34 mm (1.3 in) over about 11 days, and humidity levels are around 51%. In contrast, October experiences a slight increase in minimum temperature to 1°C (35°F) while maintaining a similar maximum of 21°C (69°F) and an average of 10°C (51°F). However, October is markedly wetter, with precipitation rising to 86 mm (3.4 in) spread over 18 days, and humidity increasing to 64%. For more detailed information, check out Cusco weather in October.
In comparing the weather of September and November, we can observe notable differences. September typically experiences cooler temperatures, with a minimum of -1°C (30°F) and an average of 10°C (49°F), while November sees slightly warmer conditions with a minimum of 3°C (38°F) and an average of 11°C (51°F). Both months share a maximum temperature of 21°C (70°F), but November is significantly wetter, receiving 128 mm (5.0 in) of precipitation over 24 days, compared to September's 34 mm (1.3 in) over just 11 days. Additionally, November has higher humidity at 84% versus September’s 51%. For more detailed insights, you can check Cusco weather in November.
In comparing the weather of September and December, it's evident that December experiences milder temperatures with a minimum of 2°C (36°F) and an average of 10°C (50°F), while September is cooler, with a minimum of -1°C (30°F) and a slightly higher maximum temperature of 21°C (70°F). Notably, December sees a significant increase in precipitation, with 214 mm (8.4 in) over 27 days compared to September's 34 mm (1.3 in) over just 11 days. Additionally, humidity levels rise sharply in December to 93%, in contrast to September’s more comfortable 51%. For more detailed information, you can check Cusco weather in December.
As September rolls in, Cusco experiences a distinct transition in weather, marking the tail end of the dry season. With average temperatures hovering around a cool 10°C, and occasional highs of 21°C, visitors can expect pleasantly mild days and crisp evenings. Unlike the peak dry months, September introduces a slight uptick in precipitation, with about 11 rain days bringing a total of 34 mm of rainfall. This dynamic shift enhances the lushness of the surroundings, making it an ideal time for exploring the region's breathtaking landscapes. For a deeper dive into what to expect throughout the year, check out the full details at Cusco Climate.