September Weather in Alto Mayo, Peru

Last updated: August 27, 2025

In September, Alto Mayo, Peru experiences a diverse climate marked by temperatures ranging from a maximum of 28°C (83°F) to a minimum of 10°C (51°F), averaging a comfortable 19°C (66°F). This transitional month sees frequent rainfall, with 20 days of precipitation contributing to an overall total of 89 mm (3.5 in). The humidity level sits at a moderate 49%, creating a refreshing atmosphere amidst the lush surroundings. Visitors can expect a mix of sunny and rainy days, making it an ideal time to appreciate the region's vibrant greenery and rich biodiversity.

September Temperature in Alto Mayo

In September, Alto Mayo, Peru, experiences a gentle transition in temperatures, marking the end of winter. With minimum temperatures hovering around 10°C (51°F) and reaching an average of 19°C (66°F), the days begin to feel increasingly comfortable. The maximum temperatures can soar to 28°C (83°F), consistent with the warmth seen in the preceding months of August and the upcoming October. This stability in temperature trends highlights a delightful blend of cool mornings and pleasantly warm afternoons, making September an ideal time for outdoor exploration and enjoying the lush beauty of the region.

September Weather in Alto Mayo: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Alto Mayo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alto Mayo, 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).
JanFebMarAprMayJunJulAugSepOctNovDec666666666665646465666767
Data source: Temperature data for Alto Mayo generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Alto Mayo

September in Alto Mayo, Peru, marks a modest transition in precipitation patterns as the region receives 89 mm (3.5 in) of rainfall over 20 days. This shift follows the driest months of July and August, where average rainfall dips significantly, with August registering only 69 mm (2.7 in). The rainfall in September signals the beginning of a resurgence, setting the stage for the heavier downpours typical in the coming months. As September ends, the precipitation levels begin to climb again, leading up to October’s average of 195 mm (7.7 in), indicating an overall trend of increasing moisture as the region prepares for its wet season ahead.

September Precipitation Trends in Alto Mayo

The chart displays monthly precipitation patterns in Alto Mayo, 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 Alto Mayo, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec291247352257188134916989195268281
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Alto Mayo

In September, Alto Mayo experiences a notable rise in humidity, settling at 49%, a slight increase from the low of 44% recorded in August. This month marks a transition away from the drier conditions of mid-year, with humidity levels beginning to recover as the region prepares for the wetter months ahead. The humidity starts to climb progressively in the subsequent months, reaching 71% by October. Overall, the data reveals a clear pattern: humidity in Alto Mayo peaks during the first half of the year, dips to a minimum in the middle of the dry season, and then steadily rises again as the region moves towards its rainy season, creating a dynamic yet rhythmic climatic dance throughout the months.

September Average Humidity in Alto Mayo

This chart illustrates the average monthly humidity levels in Alto Mayo, 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 Alto Mayo is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%85%87%88%73%51%44%49%71%77%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Alto Mayo

In September, the UV Index in Alto Mayo, Peru, measures 15, categorizing it as extreme with a quick burn time of just 10 minutes. This month continues the trend established in the preceding months, where the UV Index has remained consistently high throughout the year, peaking at 18 in March. Although September sees a slight decline from the peak summer levels, it still requires vigilance when it comes to sun protection. The overall pattern showcases a robust need for sunscreen and protective clothing, as the risk of skin damage remains significant. For comprehensive insights on UV levels, check out the detailed data here: Alto Mayo UV Index.

Maximum UV Index Levels in Alto Mayo for September

The chart shows the monthly maximum UV Index (UVI) for Alto Mayo 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 Alto Mayo typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec161718171412121315161515
Data source: Alto Mayo 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 Alto Mayo

As September unfolds in Alto Mayo, visitors are greeted with an impressive 312 hours of sunshine, signaling the tail end of a vibrant dry season. This month follows the sun-soaked peak of August, which boasts 324 hours, but still holds strong with slightly less radiance. The trend is clear: as winter transitions into spring, the days become increasingly luminous, culminating in the region's sunniest months of July and August. Following this bright spell, October sees a gentle decline to 284 hours, hinting at the upcoming rainier season. This consistent exposure to sunlight not only enhances the area's lush landscapes but also invites outdoor adventures, making September a perfect time to explore Alto Mayo's natural beauty.

Monthly Sunshine Duration in Alto Mayo: September Highlighted

The September sunshine duration represents the total number of hours Alto Mayo 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.
JanFebMarAprMayJunJulAugSepOctNovDec210h249h244h256h293h287h313h324h312h284h252h288h
Data source: Alto Mayo September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Alto Mayo During September

In Alto Mayo, Peru, the likelihood of sunny weather shows a distinct trend as summer approaches, particularly in September, when sunshine chances stand at 35%. Following a peak in July with nearly half the days seeing sun, the numbers gradually decline in August but remain relatively promising in September. This month captures the tail end of the dry season, just before the rain begins to reclaim its hold. The chance of clear skies in September reflects a transitional phase, balancing between the hot, sunny months of mid-year and the impending wet season, making it an intriguing time for visitors looking to enjoy a mix of sun and scenic greenery.

Percentage of Sunny Days in September in Alto Mayo

The chart illustrates the percentage of sunny days in Alto Mayo 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 Alto Mayo experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec14%10%8%16%37%30%49%40%35%20%11%15%
Data source: Alto Mayo September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Alto Mayo in September

In September, Alto Mayo experiences a delightful return to 12 hours of daylight, mirroring the consistent brightness of the preceding months, January through March. As the seasons transition, daylight hours gradually shift, with a notable dip to 11 hours from April to August, creating a rhythm that enhances the region's vibrant ecosystem. This month heralds a balance, signaling the onset of longer days as it slides into October, when daylight remains plentiful. The steady pattern of light and dark not only influences the daily life of residents but also nourishes the lush biodiversity that Alto Mayo is renowned for.

Average Daylight Hours in Alto Mayo for September

The chart illustrates the variation in daylight duration in Alto Mayo throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec12h 24m12h 16m12h 6m11h 57m11h 50m11h 46m11h 48m11h 54m12h 3m12h 13m12h 22m12h 26m
Data source: Alto Mayo daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Alto Mayo

In September, Alto Mayo experiences a consistent breeze with an average wind speed of 1.3 m/s (3 mph). This gentle wind is part of a broader trend that sees the region enjoying relatively calm conditions throughout much of the year, with wind speeds rarely fluctuating beyond the 1.1 to 1.4 m/s range. Interestingly, September's wind speed mirrors that of January, February, and July, suggesting a seasonal stability that is comforting to the lush landscapes of this Peruvian paradise. As the year transitions into the slightly windier months of November and December, the steady September winds help create a serene atmosphere, perfect for exploring the vibrant flora and fauna that thrive in this unique ecosystem.

Average September Wind Speed in Alto Mayo

The chart displays monthly wind speed patterns in Alto Mayo, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.31.31.11.11.21.11.31.41.3 m/s1.21.41.4
Data source: Alto Mayo September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Alto Mayo Compares to Other Months

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

In September, temperatures in Alto Mayo range from a cool 10°C (51°F) to a warm 28°C (83°F), averaging around 19°C (66°F). The month sees about 89 mm (3.5 in) of precipitation over approximately 20 days, with a moderate humidity level of 49%. In contrast, January experiences slightly higher minimum temperatures at 13°C (55°F) but maintains the same average and maximum temperatures. However, January is much wetter, with precipitation reaching 291 mm (11.5 in) over 25 days, leading to a significant increase in humidity at 82%. This stark difference in rainfall and humidity makes January feel much more tropical compared to the relatively drier September. For more detailed information, check out Alto Mayo weather in January.

When comparing the weather in September and February, there are some notable differences. September generally features milder temperatures, with a minimum of 10°C (51°F), an average of 19°C (66°F), and a maximum of 28°C (83°F). Precipitation during this month averages 89 mm (3.5 inches) over about 20 days, leading to a humidity level of 49%. In contrast, February brings slightly warmer temperatures, with a minimum of 12°C (54°F), an average of 19°C (67°F), and a maximum of 27°C (81°F). However, it is significantly wetter, with 247 mm (9.7 inches) of rain falling over 27 days, resulting in a much higher humidity of 80%. For more specific insights into February weather, you can check Alto Mayo weather in February.

When comparing the weather in September and March, it's clear that both months feature similar average temperatures of around 19°C (66°F). However, the overall experience differs significantly. September boasts milder conditions with a minimum temperature of 10°C (51°F) and a maximum of 28°C (83°F), alongside lower humidity levels of 49% and limited precipitation of 89 mm (3.5 in) spread over 20 days. In contrast, March is characterized by a higher minimum temperature of 13°C (55°F) and a maximum of 27°C (80°F), yet it faces much heavier rainfall, with a staggering 352 mm (13.9 in) over 31 days and significantly increased humidity at 85%. For those interested in more details, you can find additional information at Alto Mayo weather in March.

Comparing the weather in September and April reveals some interesting contrasts. September features a milder temperature range with minimums around 10°C (51°F) and maximums reaching 28°C (83°F), while the average temperature remains steady at 19°C (66°F). In contrast, April sees slightly warmer nights with minimum temperatures of 13°C (55°F) and maximums of 27°C (81°F), maintaining a similar average. However, April is considerably wetter, with precipitation measuring 257 mm (10.1 in) over 29 days compared to September's 89 mm (3.5 in) across 20 days. Additionally, April's humidity is much higher at 87%, while September's humidity sits at a more comfortable 49%. For more detailed insights into April's weather, you can visit Alto Mayo weather in April.

When comparing the weather in September and May, several key differences stand out. In September, temperatures range from a minimum of 10°C (51°F) to a maximum of 28°C (83°F), with an average of 19°C (66°F). The month sees a relatively moderate amount of rainfall, totaling 89 mm (3.5 in) over about 20 rainy days and a humidity level of 49%. In contrast, May experiences slightly warmer temperatures, with a minimum of 12°C (53°F) and a maximum of 27°C (81°F), while still maintaining an average of 19°C (66°F). However, it is notably wetter, with precipitation reaching 188 mm (7.4 in) across 29 rainy days and significantly higher humidity at 88%. For more detailed weather information, you can check Alto Mayo weather in May.

When comparing the weather in September to that of June, several differences become apparent. September generally features slightly warmer temperatures, with an average of 19°C (66°F) and a maximum of 28°C (83°F), compared to June's average of 18°C (65°F) and maximum of 26°C (79°F). However, June is characterized by higher humidity levels at 73%, significantly more than September’s 49%. Precipitation is also more frequent in June, with 134 mm (5.3 in) spread over 24 days, while September sees less rain at 89 mm (3.5 in) over 20 days. To explore the weather in June further, you can visit Alto Mayo weather in June.

In comparing the weather between September and July, we see some notable similarities and differences. Both months experience relatively mild temperatures, with September having a slightly warmer average of 19°C (66°F) compared to July's 18°C (64°F). The maximum temperatures are also higher in September, reaching up to 28°C (83°F) versus July's 26°C (79°F). Precipitation levels are quite similar, with September having 89 mm (3.5 in) and July slightly higher at 91 mm (3.6 in), and both months experiencing rainfall on about 20 days. Humidity levels are also comparable, with September at 49% and July at 51%. For more details specifically about July's weather patterns, you can refer to Alto Mayo weather in July.

In comparing the weather of September and August, we see that September has a slightly higher average temperature of 19°C (66°F) compared to August's 18°C (65°F). Both months experience similar maximum temperatures, peaking at 28°C (83°F). However, September is wetter, with 89 mm (3.5 in) of precipitation over 20 days, contrasting with August's 69 mm (2.7 in) over 16 days. Additionally, September's humidity is a bit higher at 49% compared to August's 44%. For a more detailed look at August weather in the Alto Mayo region, you can check out Alto Mayo weather in August.

September and October show notable contrasts in weather patterns. In September, temperatures range from a minimum of 10°C (51°F) to a maximum of 28°C (83°F), accompanied by moderate precipitation totaling 89 mm (3.5 in) over 20 days and a humidity level of 49%. In contrast, October experiences slightly warmer minimum temperatures at 12°C (53°F) while maintaining the same average and maximum temperatures as September. However, it sees a significant increase in rainfall, accumulating 195 mm (7.7 in) across 29 days, and humidity rises to 71%. These changes reflect a transition towards a wetter season, making October noticeably more humid and rainy. For more details, check out Alto Mayo weather in October.

September and November exhibit notable differences in weather patterns. September typically sees a minimum temperature of 10°C (51°F) and a maximum of 28°C (83°F), with an average of 19°C (66°F). In this month, precipitation reaches 89 mm (3.5 in) over approximately 20 days, resulting in a humidity level of 49%. In contrast, November experiences slightly higher temperatures, with a minimum of 12°C (54°F) and a maximum of 27°C (81°F), while maintaining an average of 19°C (67°F). However, it is significantly wetter, with precipitation soaring to 268 mm (10.5 in) over 29 days, leading to a much higher humidity of 77%. For more details on November weather, you can check Alto Mayo weather in November.

In September, temperatures in Alto Mayo typically range from a minimum of 10°C (51°F) to a maximum of 28°C (83°F), with an average of 19°C (66°F). The month sees a moderate level of precipitation at 89 mm (3.5 in) over approximately 20 days and maintains a humidity level of 49%. In contrast, December brings slightly warmer temperatures, with a minimum of 13°C (55°F) and a maximum of 27°C (81°F), along with an unchanged average of 19°C (67°F). However, December is significantly wetter, receiving 281 mm (11.1 in) of rain over 30 days and experiencing much higher humidity at 85%. For more details about December weather in Alto Mayo, visit Alto Mayo weather in December.

Compare Alto Mayo's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Alto Mayo

In September, Alto Mayo welcomes a notable shift in weather as it transitions from the dry season to a wetter climate. With an average temperature of 19°C and maximums reaching 28°C, the month provides a pleasant respite from the higher summer temperatures. However, the increase in rainfall—totaling 89 mm over 20 days—brings a refreshing change, enhancing the lush landscapes that Alto Mayo is known for. This month also boasts a moderate humidity level of 49%, making it feel comfortable amidst the occasional showers. For a deeper dive into the region's climate patterns, check out Alto Mayo Climate.