September Weather in Iquitos, Peru

Last updated: August 27, 2025

In September, Iquitos, Peru experiences a warm and humid climate, with maximum temperatures reaching up to 34°C (94°F). The average temperature hovers around 26°C (80°F), while the minimum can drop to 20°C (69°F) during the nights. This month is characterized by significant rainfall, with a total precipitation of 176 mm (6.9 in) spread over 23 days, making it one of the wetter months of the year. With an average humidity level of 60%, visitors can expect a tropical atmosphere, ideal for exploring the lush surroundings of the Amazon rainforest.

September Temperature in Iquitos

In September, Iquitos, Peru experiences a pleasant warmth, with temperatures showcasing a harmonious blend of tropical heat. The month begins with a minimum temperature of 20°C (69°F) and reaches a comfortable average of 26°C (80°F), peaking at about 34°C (94°F). This steady warmth continues the trend observed throughout the year, where temperatures remain relatively consistent, notably lingering around that inviting 26°C mark. As the weather transitions from the cooler months of July and August, September sets the stage for the warming up that prepares Iquitos for the more intense heat of the coming months. Visitors can enjoy the lush Amazonian scenery in comfortably warm conditions, making it an ideal time for exploration and adventure.

September Weather in Iquitos: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Iquitos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iquitos, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec797979797878777980807979
Data source: Temperature data for Iquitos generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Iquitos

In September, Iquitos experiences a moderate amount of rainfall, recording 176 mm (6.9 in) over the month. This marks a slight rebound from August’s drier conditions, where only 122 mm (4.8 in) fell on 17 days. With 23 days of precipitation in September, the city transitions back into its characteristic wet season, setting the stage for the heavier rains to come in the following months. The precipitation trend clearly indicates that as the year progresses, the intensity and frequency of rainfall tend to increase, peaking in March with an impressive 335 mm (13.2 in). This pattern underscores the tropical climate's dynamic nature, where periodic downpours shape both the environment and daily life in this vibrant Peruvian city.

September Precipitation Trends in Iquitos

The chart displays monthly precipitation patterns in Iquitos, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Iquitos, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec255216335309230222155122176213244292
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Iquitos

In September, Iquitos, Peru experiences a notable drop in humidity, averaging around 60%, the lowest point in the year. This decline marks a significant shift from the sweltering midsummer months when humidity peaks at 91% in May. Following a gradual decrease from the rainy season, September's more comfortable atmosphere signals the transition into a drier, cooler period. However, humidity begins to creep back up in October, reaching 62%, hinting at the upcoming wet season. This cycle of humidity illustrates the tropical climate of Iquitos, characterized by a dynamic interplay between heat and moisture throughout the year.

September Average Humidity in Iquitos

This chart illustrates the average monthly humidity levels in Iquitos, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Iquitos is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%82%86%91%85%77%68%60%62%76%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Iquitos

In September, Iquitos, Peru, experiences a UV Index of 13, categorizing it as extreme and maintaining a consistent burn time of just 10 minutes. This month reflects a slight increase from August's UV Index of 12, indicative of Iquitos' year-round intensity in sun exposure. The UV Index has generally remained high across the year, with values peaking at 16 from January to April. As autumn approaches, while the numbers may fluctuate slightly, the importance of sun protection remains constant. For detailed information and insight on UV levels throughout the year, visit Iquitos UV Index.

Maximum UV Index Levels in Iquitos for September

The chart shows the monthly maximum UV Index (UVI) for Iquitos in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Iquitos typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151616161412111213141313
Data source: Iquitos September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Iquitos

As September unfolds in Iquitos, Peru, it brings a dazzling 286 hours of sunshine, comfortably nestled between the intense light of August and the softer glow of October. This month marks a subtle transition, showcasing a remarkable summer peak in sunlight that began in May. With hours of sunshine consistently rising from January’s 222 hours to a high of 299 hours in August, September signals a gentle tapering yet still offers ample bright days, contributing to the vibrant atmosphere of the city. This trend reflects the rich, tropical climate that Iquitos is known for, making September a splendid time for exploration and adventure under the sun.

Monthly Sunshine Duration in Iquitos: September Highlighted

The September sunshine duration represents the total number of hours Iquitos experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec222h229h234h232h248h263h296h299h286h269h230h255h
Data source: Iquitos September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Iquitos During September

In Iquitos, Peru, September marks a noticeable shift in sunny weather, boasting a 34% chance of sunshine, making it one of the more favorable months for clear skies. As the region transitions from the drier months of August—which enjoys the highest likelihood of sun at 38%—to the onset of the wetter season, the sunny days in September hint at a gradual decline in bright weather ahead. This trend showcases the area's seasonal variability; after September, the chance of sun decreases significantly, plummeting to 21% in October and continuing downward through the rest of the year. Thus, September offers an ideal window for enjoying Iquitos' natural beauty before the rainy season takes hold.

Percentage of Sunny Days in September in Iquitos

The chart illustrates the percentage of sunny days in Iquitos throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Iquitos experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec13%8%9%13%21%21%36%38%34%21%14%10%
Data source: Iquitos September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Iquitos in September

In Iquitos, Peru, the daylight duration creates a fascinating rhythm throughout the year. From January to April, the city enjoys a consistent 12 hours of daylight, offering ample opportunity for exploration and outdoor activities. As May rolls in, daylight diminishes slightly to 11 hours, and this trend continues through the cooler months of June, July, and August. However, as September arrives, daylight returns to a generous 12 hours, welcoming back the sun with open arms. This consistent cycle continues into the final months of the year, with October, November, and December also basking in the same ample sunlight. Overall, Iquitos transitions from a brief dip in daylight during the midyear months to a rejuvenating stretch of sunny days towards the end of the year, creating a vibrant and inviting atmosphere for both residents and visitors alike.

Average Daylight Hours in Iquitos for September

The chart illustrates the variation in daylight duration in Iquitos throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec12h 18m12h 12m12h 6m12h11h 55m11h 53m11h 54m11h 58m12h 4m12h 10m12h 16m12h 19m
Data source: Iquitos daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Iquitos

As September sweeps into Iquitos, Peru, the gentle whispers of the wind continue to echo the patterns of previous months. With an average wind speed of 1.2 m/s (3 mph), the breeze is consistent with the slightly calmer conditions experienced in the mid-year months. The transition from August's 1.3 m/s to September’s mild gusts marks a subtle shift, but the overall trend remains steady, maintaining a tranquil atmosphere. This serene wind flow, prevalent from January through September, offers a comforting backdrop to the vibrant life in Iquitos, as the winds linger lightly, inviting residents and visitors alike to embrace the enchanting rhythms of the Amazon.

Average September Wind Speed in Iquitos

The chart displays monthly wind speed patterns in Iquitos, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec1.31.31.31.21.21.21.21.31.2 m/s1.31.31.3
Data source: Iquitos September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Iquitos Compares to Other Months

Weather in Iquitos varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Iquitos, focusing on differences in temperature, rainfall, humidity, and UV levels.

In September, the weather is characterized by warm temperatures, with a minimum of 20°C (69°F), an average of 26°C (80°F), and a maximum of 34°C (94°F). The month experiences significant rain, accumulating to 176 mm (6.9 in) over about 23 days, accompanied by a humidity level of 60%. In contrast, January sees a slightly warmer minimum temperature of 21°C (71°F) and maintains the same average and maximum temperatures as September. However, it has heavier rainfall, measuring 255 mm (10.0 in) across the same number of rainy days, and increased humidity at 83%. For more detailed insights, you can visit Iquitos weather in January.

September and February both offer warm temperatures, with average highs around 26°C (80°F). However, September tends to have a slightly lower minimum temperature of 20°C (69°F) compared to February's minimum of 22°C (72°F). February also experiences higher humidity at 79%, while September's humidity is at 60%. Precipitation is notably more pronounced in February, with 216 mm (8.5 in) of rainfall over 24 days, compared to September's 176 mm (6.9 in) over 23 days. For more detailed insights, check out Iquitos weather in February.

In comparing the weather of September and March, both months feature similar average temperatures around 26°C (79°F), but they differ in other respects. In September, temperatures range from a minimum of 20°C (69°F) to a maximum of 34°C (94°F), with a total precipitation of 176 mm (6.9 in) over 23 days and a humidity level of 60%. By contrast, March experiences slightly warmer temperatures, with a minimum of 22°C (73°F) and a maximum of 35°C (96°F). This month also sees considerably more rainfall, totaling 335 mm (13.2 in) across 28 days, and higher humidity at 82%. For a detailed look at March's weather, check out Iquitos weather in March.

In comparing the weather of September and April, both months exhibit warm temperatures with September averaging 26°C (80°F) and April slightly higher at the same average but with a maximum of 35°C (95°F). However, April tends to be wetter, receiving significantly more precipitation at 309 mm (12.2 in) over 26 days, compared to September’s 176 mm (6.9 in) across 23 days. The humidity also rises in April to 86%, making it feel more tropical than September, which has a humidity level of 60%. For more detailed information, you can check Iquitos weather in April.

September and May exhibit similar average temperatures, both ranging from a minimum of 20°C (69°F) to around 26°C (80°F), with maximum temperatures slightly higher in September at 34°C (94°F) compared to May’s 33°C (92°F). However, May tends to be wetter, experiencing higher precipitation levels at 230 mm (9.0 in) across 25 days, compared to September's 176 mm (6.9 in) over 23 days. Furthermore, humidity is notably higher in May at 91%, making it feel more oppressive than September’s 60%. For more information about the weather in May, you can refer to Iquitos weather in May.

In September, temperatures in Iquitos range from a comfortable minimum of 20°C (69°F) to a warm maximum of 34°C (94°F), with an average of 26°C (80°F). The month sees relatively high humidity at 60%, along with 176 mm (6.9 in) of precipitation spread over 23 days. In contrast, June experiences slightly warmer nighttime temperatures with a minimum of 21°C (69°F) and a similar average of 26°C (78°F). However, June is characterized by heavier rainfall, accumulating 222 mm (8.8 in) over 24 days, and significantly higher humidity at 85%. This makes June a wetter and more humid month compared to September. For more detailed insights, you can check out Iquitos weather in June.

When comparing the weather of September to that of July, one can observe a slight increase in temperature in September, with a minimum of 20°C (69°F) and an average of 26°C (80°F), compared to July's minimum of 17°C (64°F) and average of 25°C (78°F). However, July boasts a more moderate humidity level at 76%, while September sees a decrease to 60%. Both months experience significant rainfall, but September has slightly higher precipitation at 176 mm (6.9 in) over 23 days, compared to July's 155 mm (6.1 in) across 19 days. For more detailed insights on July weather conditions, you can visit Iquitos weather in July.

In comparing the weather between August and September, we see that September tends to be warmer overall, with minimum temperatures rising to 20°C (69°F) compared to August's 17°C (63°F). Both months share a maximum temperature of 34°C (94°F), but September experiences more precipitation at 176 mm (6.9 in) over 23 days, compared to August's 122 mm (4.8 in) over 17 days. Additionally, humidity levels are slightly higher in August at 68%, while September sees a decrease to 60%. For a more detailed look at Iquitos weather during August, you can visit Iquitos weather in August.

In September, temperatures in Iquitos range from a minimum of 20°C (69°F) to a maximum of 34°C (94°F), with an average temperature of 26°C (80°F). The month experiences significant rainfall, totaling 176 mm (6.9 in) over 23 days, and humidity levels hover around 60%. In contrast, October sees a slight increase in temperatures, with a minimum of 22°C (71°F) and a maximum of 35°C (95°F), while maintaining the same average of 26°C (80°F). Precipitation rises to 213 mm (8.4 in) spread over 24 days, and humidity increases to 62%. For more specific details on the weather during October, please refer to Iquitos weather in October.

September and November in Iquitos exhibit similar average temperatures, with both months hovering around 26°C (80°F). However, September features slightly lower minimum temperatures at 20°C (69°F) compared to November's 22°C (72°F). Precipitation increases in November, reaching 244 mm (9.6 in) over 25 days, while September sees 176 mm (6.9 in) across 23 days, indicating a wetter month. Additionally, humidity rises in November to 76%, contrasting with September’s 60%. For more detailed insights, you can check Iquitos weather in November.

In September, Iquitos experiences warm temperatures with a minimum of 20°C (69°F), averaging around 26°C (80°F), and peaking at 34°C (94°F). The month sees a significant amount of rainfall, totaling 176 mm (6.9 in) across 23 days, accompanied by a humidity level of 60%. In contrast, December maintains a similar temperature range, with minimums of 22°C (73°F), averaging 26°C (79°F), and a maximum of 34°C (93°F). However, December is notably wetter, with precipitation climbing to 292 mm (11.5 in) over 27 days, and humidity levels rising to 87%. For more details, you can check Iquitos weather in December.

Compare Iquitos's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Iquitos

As September rolls into Iquitos, the weather showcases a blend of warmth and humidity, making it distinct from other months. With average temperatures hovering around 26°C (80°F), the days can reach a maximum of 34°C (94°F), creating a tropical atmosphere. However, this month also witnesses a significant amount of precipitation, with rain gracing the city on about 23 days. This combination of heat and consistent showers contributes to the region's lush landscape but also means that visitors should be prepared for a muggy experience. For a deeper dive into the yearly patterns and nuances of the city's climate, check out Iquitos Climate.