Last updated: August 27, 2025
September in Arequipa, Peru offers a delightful mild climate, with temperatures peaking at a comfortable 25°C (77°F) during the day and dipping to a cool 6°C (43°F) at night. The average temperature hovers around 15°C (59°F), inviting both locals and visitors to enjoy outdoor activities. Notably, this month experiences low precipitation, recording just 1 mm, with 0 days of rain, making it ideal for exploring the city's stunning landscapes. With humidity levels at 58%, the weather is pleasantly crisp, creating a perfect backdrop for travel in this enchanting region.
In September, Arequipa experiences a delightful transition as temperatures start to warm up, marking the onset of spring. With minimums around 6°C (43°F) and maximums reaching up to 25°C (77°F), the city offers a pleasant average of 15°C (59°F). This increase in warmth, compared to the chillier months of July and August, hints at the approaching summer, while still retaining the refreshing coolness that characterizes the region. The gradual rise in daytime temperatures creates an inviting atmosphere for outdoor exploration, making it an ideal time to appreciate Arequipa's vibrant culture and stunning landscapes.
In September, Arequipa experiences a significant shift towards the dry season, marked by a strikingly low precipitation amount of just 1 mm (0.0 in) and no recorded rainy days. This pattern follows August, which also saw no rainfall, continuing a trend of minimal precipitation that begins around mid-year. Compared to the preceding months of January to March, which collectively showcase substantial rainfall with totals around 240 mm (9.4 in) and extensive rainy days, September highlights the transition to Arequipa's drier climate. As the annual cycle progresses, this notable decrease underscores the region's climatic rhythm, paving the way for the upcoming months that see sporadic increases in precipitation, but none compare to the wetness of early the year.
In September, Arequipa experiences a notable shift in humidity as it steadily declines to 58%, marking one of the driest months of the year. This drop follows the cooler, more humid months of July and August, where humidity levels hovered around 61% and 57%, respectively. As the region transitions into spring, the relatively low humidity in September sets the stage for more comfortable conditions, contrasting sharply with the high levels encountered earlier in the year, such as the peak of 91% in April. Following September, humidity begins to rise again as October arrives, reminding residents and visitors alike of Arequipa's dynamic climate patterns.
As the sun begins to transition from winter to spring in Arequipa, September maintains a notably high UV Index of 15, categorizing the exposure as extreme and cautioning that skin can burn in as little as 10 minutes. This month, like several preceding it, signals a continuation of intense solar radiation, following an upward trend from July’s 11 to August’s 13, and setting the stage for October’s further elevation back to 17. With the UV Index remaining persistently high throughout the year, it's crucial for residents and visitors alike to stay protected against the sun's rays. For more detailed information, visit the Arequipa UV Index.
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As September rolls in, Arequipa basks in a splendid 342 hours of sunshine, marking a slight decline from the peak of August's 346 hours but still showcasing the city's ample light. This month continues a promising trend seen throughout winter and spring, where daylight hours steadily increase from January's modest 250 hours to nearly touch the 350-hour mark by October. Visitors can savor the warm glow of early spring days, as Arequipa makes a seamless transition from winter's gentle sun to the vibrant rays of the approaching summer. With each passing month, the city reveals a delightful dance of light, inviting both locals and tourists to revel in its sunny embrace.
In Arequipa, Peru, September offers a promising 68% chance of sunny weather, marking a transition from the peak dry season experienced in the previous months. This trend reflects a gradual decrease from the 94% sunshine in July and an 88% chance in August, suggesting that while the weather remains predominantly bright, it hints at the onset of humidity as spring approaches. Following September, the likelihood of sunshine dips slightly to 64% in October, emphasizing that early spring is still quite generous with sunny days. Overall, September stands out as a delightful prelude to the warmer months ahead, inviting outdoor enthusiasts to enjoy the beautiful landscape bathed in sunlight.
In Arequipa, Peru, September marks a delightful transition as the daylight duration returns to 12 hours, reminiscent of the summer months of January through March. This change follows a period of slightly shorter days during the cooler months between April and August, where daylight was capped at 11 hours. With September's longer days, residents and visitors alike can enjoy the increasing sunlight, which heralds the approach of the warmer and brighter months ahead. This seasonal rhythm beautifully highlights Arequipa's unique climate, balancing periods of light and shadow throughout the year.
As September arrives in Arequipa, Peru, the gentle breeze begins to ebb and flow with an average wind speed of 1.8 m/s (4 mph), mirroring the consistent patterns observed in previous months. From January through August, the winds steadily increase before stabilizing in the early autumn, with only slight variations. This trend of gradually intensifying winds, peaking in July and August at 1.9 m/s, hints at an approaching seasonal shift. As the dry season continues into September, the reliable winds contribute to the region's warm, sunny climate, making it an ideal time for outdoor exploration and enjoyment of Arequipa’s stunning landscapes.
Weather in Arequipa varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Arequipa, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is generally mild and pleasant, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F) and an average of 15°C (59°F). The month typically experiences very little rainfall, with only 1 mm recorded over 0 days, and a humidity level of 58%. In contrast, January brings cooler average temperatures of 13°C (55°F) and a maximum of 23°C (73°F), but significantly more precipitation, totaling 242 mm (9.5 in) over 25 days, along with increased humidity at 89%. For more details on January weather, you can visit Arequipa weather in January.
Comparing the weather in September and February reveals significant differences in temperature, precipitation, and humidity. September boasts a comfortable range of temperatures, with a minimum of 6°C (43°F) and a maximum of 25°C (77°F), accompanied by nearly zero precipitation and moderate humidity at 58%. In contrast, February sees a slight increase in minimum temperature at 7°C (44°F) but a decrease in maximum temperature to 20°C (69°F). This month is characterized by heavy rainfall, with a staggering 235 mm (9.3 in) of precipitation over 27 days, and humidity levels are notably higher at 90%. For more detailed insights into February weather in Arequipa, you can check out Arequipa weather in February.
In comparing the weather of September and March, September boasts milder temperatures with a minimum of 6°C (43°F), an average of 15°C (59°F), and a maximum reaching 25°C (77°F). It experiences minimal precipitation, with only 1 mm (0.0 in) recorded over the month, resulting in a comfortable humidity level of 58%. In contrast, March tends to be wetter and cooler, with a minimum temperature of 7°C (44°F), an average of 13°C (55°F), and a maximum of 20°C (68°F). This month sees significant rainfall, accumulating to 231 mm (9.1 in) over 29 days, leading to a much higher humidity level of 90%. To explore more about the specific weather conditions in March, visit Arequipa weather in March.
In comparing the weather of September and April, September tends to be milder with an average temperature of 15°C (59°F) and minimal precipitation, enjoying dry conditions with only 1 mm of rain over the month. In contrast, April experiences cooler average temperatures at 13°C (56°F) and significantly more rainfall, totaling 57 mm over approximately 12 rainy days, resulting in a much higher humidity of 91%. This stark difference highlights September's drier and warmer climate compared to the wetter and cooler conditions of April. For more details on April's weather, visit Arequipa weather in April.
In September, the weather is generally warmer with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F) and an average of 15°C (59°F). The month enjoys dry conditions, with only 1 mm of precipitation over no rainy days and a humidity level of 58%. In contrast, May presents cooler temperatures, with a minimum of 5°C (41°F), an average of 13°C (56°F), and a maximum of 23°C (74°F). There is a slight increase in precipitation in May, totaling 6 mm over 2 days, alongside a higher humidity of 88%. For more details, you can check out Arequipa weather in May.
In comparing the weather between September and June, September generally offers slightly warmer temperatures, with averages around 15°C (59°F) and maximums reaching 25°C (77°F), while June temperatures are a bit cooler, with an average of 13°C (55°F) and maximums peaking at 23°C (74°F). Both months experience minimal precipitation, with only 1 mm recorded across zero rainy days. However, September has a lower humidity level at 58%, compared to June, where humidity is higher at 76%. For a more detailed look at June weather in Arequipa, visit Arequipa weather in June.
In September, the temperatures tend to be slightly warmer, with an average of 15°C (59°F) compared to July's average of 13°C (55°F). The maximum temperature in September can reach up to 25°C (77°F), offering more warmth than July's peak of 23°C (73°F). Both months see minimal precipitation, with September and July recording just 1 mm (0.0 in) and no rainy days, although humidity levels are slightly lower in September at 58%, compared to July's 61%. For more detailed insights, you can check Arequipa weather in July.
In August, the weather in Arequipa is characterized by cooler temperatures, with a minimum of 3°C (38°F) and an average of 13°C (56°F), peaking at 23°C (74°F). The humidity is fairly stable at 57%, and there is no recorded precipitation. In contrast, September sees a noticeable rise in temperatures, with a minimum of 6°C (43°F) and an average of 15°C (59°F), reaching a maximum of 25°C (77°F). Despite the increase in warmth, September also maintains a dry trend with just 1 mm of precipitation over the month and no rainy days. For more details, check out Arequipa weather in August.
In September, the weather features a comfortable range of temperatures, with a minimum of 6°C (43°F), an average of 15°C (59°F), and a maximum of 25°C (77°F). This month experiences very little precipitation, with only 1 mm recorded over no rainy days, resulting in a humidity level of 58%. In contrast, October sees a slight dip in maximum temperature to 24°C (76°F), while maintaining the same minimum and average temperatures. However, October is noticeably wetter, with 12 mm of precipitation spread over three days and an increase in humidity to 75%. For more detailed information, you can check Arequipa weather in October.
In comparing the weather of September and November, we notice some notable differences. September typically enjoys milder temperatures, with a minimum of 6°C (43°F) and a maximum of 25°C (77°F), whereas November sees slightly warmer conditions, with a minimum of 7°C (44°F) and a maximum of 24°C (75°F). While both months share an average temperature of 15°C (59°F), November experiences significantly more precipitation, totaling 17 mm (0.7 in) over five days, compared to September's dry spell with no recorded rainfall. Additionally, November's humidity rises to 83%, creating a more oppressive atmosphere compared to September's 58%. For a more detailed look at November's climate, you can visit Arequipa weather in November.
September and December weather in Arequipa exhibit noticeable differences. In September, temperatures range from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), with an average of around 15°C (59°F). The month is quite dry, receiving only 1 mm of precipitation and experiencing zero rainy days, accompanied by a moderate humidity level of 58%. In contrast, December sees slightly warmer temperatures with minimums of 7°C (45°F) and maximums reaching 24°C (75°F), resulting in an average of 14°C (58°F). However, it is significantly wetter, with a total of 65 mm (2.5 in) of rain spread across 12 days, leading to a higher humidity level of 84%. For more information, you can check Arequipa weather in December.
September in Arequipa offers a pleasant respite from the extremes of other months, delivering mild temperatures and inviting conditions for exploration. With daytime highs reaching a comfortable 25°C (77°F) and nights cooling down to a refreshing 6°C (43°F), visitors can enjoy a perfect blend of warmth and cool breezes. Uniquely, September boasts no precipitation, allowing for uninterrupted outdoor activities and stunning views of the surrounding landscapes. The relatively low humidity level of 58% enhances the overall comfort, making this month an ideal time to experience Arequipa's beauty. For those keen to learn more about how this month fits into the region’s overall climate profile, visit Arequipa Climate.