Last updated: August 27, 2025
In September, Callao, Peru experiences a mild climate characterized by an average temperature of 17°C (62°F). Daily highs reach a comfortable 20°C (69°F), while nighttime lows settle around 14°C (57°F). This month sees minimal rainfall, with only 10 mm (0.4 in) of precipitation over just one day, resulting in a humidity level of 53%. With its temperate weather, September is an ideal time to explore Callao's vibrant culture and scenic coastlines.
In September, Callao, Peru, experiences a mild and consistent climate that's characteristic of its coastal location. The temperatures range from a cool 14°C (57°F) at night to a comfortable 20°C (69°F) during the day, with an average temperature settling at 17°C (62°F). This month marks the transition to slightly warmer conditions, as temperatures begin to rise gradually after the cooler winter months of July and August. Despite being one of the cooler months, September retains a pleasant atmosphere, making it an ideal time for exploring this vibrant coastal city. As the spring season approaches, Callao offers visitors a refreshing escape with its stable weather and invigorating ocean breeze.
In September, Callao, Peru, experiences a continuation of its typically dry conditions, with just 10 mm (0.4 inches) of precipitation recorded over a single day. This slight rainfall marks a transition from the more humid months earlier in the year, where precipitation peaked in January at 47 mm (1.9 in) across 15 days. As the region shifts towards its drier season, the frequency of rainy days diminishes significantly, with September contributing to an overall trend of increasing aridity as the year progresses. Notably, this pattern is mirrored in the subsequent months, where consistent low precipitation levels become the norm, emphasizing Callao's distinctive climate.
As the climate transitions from the dry winter months to the wetter season, September in Callao, Peru, marks a notable shift in humidity levels. With humidity at 53%, September experiences a slight increase compared to the drier summer peaks of 50% in August and 56% in July. This gradual rise signals the onset of spring, where the air begins to hold more moisture, setting the stage for the wet season ahead. Notably, this value, while significantly lower than the tropical humidity of the earlier months, serves as a reminder of the varying microclimates that define Callao throughout the year, leading to a refreshing yet subtly moist atmosphere as the year progresses.
In September, Callao, Peru experiences an extreme UV Index of 12, maintaining a consistent pattern seen throughout the months leading up to it. With a rapid burn time of just 10 minutes, sun safety is crucial during this time, aligning with the overall trend of high UV levels from January through November. Interestingly, the intensity dipped slightly in May and June to a very high category but surged back in the following months, underscoring the importance of protective measures against UV radiation. As you plan your outings this month, don’t forget to stay informed about the sun’s intensity by checking the Callao UV Index regularly.
UV Risk Categories
September in Callao, Peru, continues the trend of abundant sunshine, contributing to a delightful average of 326 hours of sunlight. This month sits comfortably within the warm embrace of a generally radiant year, following the peak of 335 hours in August. As the days begin to shift towards October, which records the highest annual average of 340 hours, September offers a perfect blend of lingering summer warmth and early autumn freshness. It's a time when the coastline buzzes with activity, inviting locals and visitors alike to bask in the sunshine before the shift in seasons. With light and warmth dominating the landscape, September shines as a picturesque month in Callao’s vibrant yearly narrative.
As September rolls around in Callao, Peru, there’s a notable shift in the likelihood of sunny weather, with a 41% chance of sunshine illuminating the skies. Following the impressive peaks of July and August, when the sun was more generous, the chances in September still remain relatively promising, even as they dip slightly. This late winter month marks a transition into spring, establishing a pleasant mix of sunny days that residents and visitors alike can enjoy. Notably, the sun's presence remains a welcoming aspect of the bustling coastal climate, making September an appealing time for outdoor activities under the Peruvian skies.
In Callao, Peru, the rhythm of daylight mirrors the seasons, showcasing a fascinating pattern throughout the year. From January to March, residents bask in a consistent 12 hours of daylight, making these months perfect for outdoor activities and exploration. As the calendar transitions into April, daylight begins to wane, cutting back to 11 hours, a trend that persists through the depths of winter until August. However, come September, the daylight once again extends to 12 hours, signaling the start of a brighter phase as daylight gradually returns, accompanied by the arrival of spring. This cyclical dance of daylight, characterized by its notable splits, exemplifies the unique climatological features of Callao, inviting both locals and visitors to relish the balanced mix of light and shadow throughout the year.
As September rolls into Callao, Peru, the winds continue to maintain a lively presence, averaging 3.0 m/s (7 mph)—a rhythm established over the previous month. Following a steady increase throughout the winter months, where winds reliably picked up from 2.9 m/s in June to 3.1 m/s in August, September marks a slight dip, but without sacrificing the breezy energy that defines the region. This month’s winds embody the transitional nature of spring, striking a balance before the upcoming fluctuations in speed through the remainder of the year. Overall, the steady flow of air serves as a reminder of the ever-charming coastal climate that makes Callao an alluring spot.
Weather in Callao varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Callao, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is generally mild with temperatures ranging from a minimum of 14°C (57°F) to a maximum of 20°C (69°F), accompanied by relatively low precipitation of only 10 mm (0.4 in) over just one day. The humidity sits at a comfortable 53%, making it a pleasant time to be outdoors. In contrast, January sees significantly warmer conditions, with temperatures ranging from a minimum of 17°C (64°F) to a maximum of 27°C (81°F). However, it also brings a higher level of precipitation, totaling 47 mm (1.9 in) across 15 days, and the humidity climbs to 89%. This dramatic shift highlights the transition from the more temperate early spring conditions of September to the warm and humid summer weather typical of January. For more details on January weather in Callao, check out Callao weather in January.
September and February present notably different weather patterns. In September, temperatures range from a minimum of 14°C (57°F) to a maximum of 20°C (69°F), with a comfortable average of 17°C (62°F). The month experiences relatively low precipitation, with only 10 mm (0.4 in) spread over just one day, and humidity sits at 53%. In contrast, February is significantly warmer, with temperatures starting at 18°C (65°F) and peaking at 28°C (82°F), averaging 22°C (72°F). This month sees much higher rainfall, totaling 53 mm (2.1 in) over 12 days, alongside increased humidity at 89%. For more details on February's climate, you can check out Callao weather in February.
September and March present distinctly different weather patterns. In September, temperatures range from a mild minimum of 14°C (57°F) to a comfortable maximum of 20°C (69°F), with an average of 17°C (62°F). The month sees minimal rainfall, typically only 10 mm (0.4 in) over just one day, and the humidity averages around 53%. In contrast, March boasts significantly warmer temperatures, with a minimum of 17°C (64°F) and an average of 22°C (72°F), peaking at a high of 27°C (81°F). However, it also experiences much more precipitation, totaling 50 mm (2.0 in) over about 14 days, alongside much higher humidity levels at 90%. These differences highlight the transition from the cooler, drier early spring of September to the warmer, wetter conditions typical of March. For more details, you can check Callao weather in March.
In comparing September and April weather, it is evident that both months present distinct climatic characteristics. September has milder temperatures with a minimum of 14°C (57°F) and a maximum of 20°C (69°F), along with low precipitation averaging only 10 mm (0.4 in) over just one day and a comfortable humidity of 53%. In contrast, April enjoys higher temperatures, with a minimum of 15°C (60°F) and a maximum of 26°C (79°F), though it experiences more rainfall totaling 18 mm (0.7 in) spread across five days, accompanied by significantly higher humidity at 89%. For more detailed insights into April weather, you can refer to Callao weather in April.
In September, the weather tends to be mild, with temperatures ranging from a minimum of 14°C (57°F) to a maximum of 20°C (69°F) and an average of 17°C (62°F). The month typically experiences low precipitation, averaging only 10 mm (0.4 in) with just one day of rainfall and a relatively comfortable humidity level of 53%. In contrast, May is warmer, featuring a minimum temperature of 14°C (58°F) and a maximum of 25°C (78°F), with an average temperature of 19°C (66°F). Despite having slightly lower precipitation at 9 mm (0.4 in) also spread across one day, May comes with higher humidity at 83%, contributing to a more humid feel. For a closer look at what to expect, check out Callao weather in May.
September and June showcase similar temperature ranges, with September experiencing slightly cooler conditions—averaging 17°C (62°F) compared to June's 18°C (64°F). Both months receive the same precipitation of 10 mm (0.4 in), although September has light rain on one day, while June enjoys a dry spell with no rainy days. Additionally, humidity tends to be higher in June at 69%, compared to September's more comfortable 53%. This makes June feel a bit more humid, which can be a factor for outdoor activities. For more detailed insights on the weather in June, check out Callao weather in June.
In comparing the weather of September and July, we find that both months exhibit similar temperature ranges, with September featuring a minimum of 14°C (57°F), an average of 17°C (62°F), and a maximum of 20°C (69°F), which is quite comparable to July’s minimum of 14°C (57°F), average of 17°C (63°F), and maximum of 21°C (69°F). Precipitation levels are also close, with September receiving 10 mm (0.4 inches) over one day, while July has 11 mm (0.4 inches) but experiences no rainy days. Humidity slightly varies, standing at 53% in September compared to 56% in July. For more detailed insights on July weather, you can visit this link: Callao weather in July.
In comparing the weather between August and September, we see similar temperature ranges for both months, with minimums around 14°C (57°F), averages at 17°C (62°F), and maximums hitting 20°C (69°F). However, September experiences slightly higher humidity at 53% compared to August's 50%. Notably, while August recorded no days of precipitation, September saw light rainfall, totaling 10 mm (0.4 in) across one day. For a closer look at August's weather, you can visit this link: Callao weather in August.
In September, the weather features mild temperatures with a minimum of 14°C (57°F) and an average of 17°C (62°F), peaking at 20°C (69°F). The month sees minimal precipitation, only 10 mm (0.4 in) spread over just one day, resulting in a relatively low humidity of 53%.
In contrast, October maintains a similar temperature range, with a minimum of 14°C (58°F), an average of 17°C (63°F), and a maximum of 21°C (71°F). However, it experiences slightly more precipitation at 10 mm (0.4 in) over two days, leading to increased humidity levels of 68%. For more details about October's weather, you can visit Callao weather in October.
In September, the weather is generally mild, with temperatures ranging from a minimum of 14°C (57°F) to a maximum of 20°C (69°F) and an average temperature of 17°C (62°F). The month experiences minimal rainfall, with only 10 mm (0.4 in) of precipitation over just one day, coupled with a comfortable humidity level of 53%. In contrast, November boasts slightly warmer temperatures, with a minimum of 15°C (59°F) and a maximum of 23°C (74°F), averaging 18°C (65°F). While precipitation remains low at 9 mm (0.4 in), it is spread across two days, and the humidity rises significantly to 81%. For those interested in seasonal weather patterns, more details can be found in Callao weather in November.
In September, the weather tends to be mild, with average temperatures around 17°C (62°F) and maximums reaching up to 20°C (69°F). The month is relatively dry, featuring just 10 mm (0.4 in) of precipitation over only 1 day, coupled with a humidity level of 53%. In contrast, December experiences warmer temperatures, with averages of 20°C (68°F) and highs of 25°C (76°F). However, this month also sees increased moisture, with precipitation measuring 17 mm (0.7 in) across 3 days and a much higher humidity at 87%. For more detailed information, you can check Callao weather in December.
As September unfolds in Callao, the weather strikes a refreshing balance, featuring mild temperatures that typically range from the comfortable mid-teens to a pleasant 20°C (69°F). Compared to the winter months, this time of year sees a notable reduction in precipitation, with only one day of rain expected, and humidity levels hovering at a moderate 53%. This transitional month paves the way for the upcoming warmer season, making it an ideal time for outdoor activities. For a more detailed insight into the overall climate trends in Callao, explore Callao Climate.