September Weather in La Union, Peru

Last updated: August 27, 2025

In September, La Union, Peru, enjoys pleasant weather characterized by maximum temperatures reaching 28°C (83°F) and an average of 20°C (68°F), creating an inviting atmosphere for outdoor activities. With minimum temperatures of 15°C (60°F), the days remain comfortably warm while evenings are cooler. Notably, precipitation is minimal, with just 2 mm (0.1 in) recorded and zero rainy days, allowing residents and visitors to bask in the dry conditions. The air carries a humidity level of 75%, adding a slight tropical touch to this idyllic month, making it an ideal time for exploration and enjoyment in the region.

September Temperature in La Union

In September, La Union, Peru, experiences a gentle transition towards warmer days as temperatures start to rise. With a minimum of 15°C (60°F) and an average of 20°C (68°F), the month marks a slight increase in warmth compared to the cooler peak winter months of July and August. The maximum temperature reaches 28°C (83°F), inviting residents and visitors alike to enjoy the mild conditions that precede the higher temperatures of late spring and summer. Overall, September balances coolness with comfortable warmth, making it an ideal time to explore the beautiful landscape of La Union.

September Weather in La Union: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in La Union, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In La Union, 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).
JanFebMarAprMayJunJulAugSepOctNovDec777980777371686868697074
Data source: Temperature data for La Union 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 La Union

In September, La Union, Peru experiences a notable transition in its climate as the dry season begins to wind down. With just 2 mm (0.1 in) of precipitation recorded, the month reflects a continuation of the minimal rains that characterize the late winter months. Interestingly, there are no recorded precipitation days this month, underscoring the dry spell following the peak wet period in March when rainfall reached 97 mm (3.8 in) over seven days. This trend of dwindling rain persists into the spring months, as the region prepares for a gradual increase in moisture, leading into the more humid months ahead. As the landscape rests under the bright skies of early spring, the slight uptick in precipitation expected in October, at 7 mm (0.3 in), hints at the changing climate patterns to come.

September Precipitation Trends in La Union

The chart displays monthly precipitation patterns in La Union, 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 La Union, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec14439719741227915
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in La Union

In La Union, Peru, September marks a transition in humidity levels as the dry season gives way to more moisture-laden air. At 75%, September's humidity represents a moderate rise from the previous months of July and August, which both recorded a low 71%. This increase can signal the gradual onset of the rainy season, providing a refreshing change after the drier winter months. While September’s humidity remains notably lower than the peak levels seen in the early months of the year, such as 89% in January and May, it sets the stage for a shift that continues into October and November. Overall, the trend indicates a seasonal dance between humidity and dryness, showcasing La Union's diverse climate throughout the year.

September Average Humidity in La Union

This chart illustrates the average monthly humidity levels in La Union, 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 La Union is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%87%87%86%89%84%71%71%75%77%79%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in La Union

In September, La Union, Peru, continues to experience a high UV Index of 14, placing it firmly in the extreme exposure category, with a burn time of just 10 minutes. This month maintains the scorching trend established earlier in the year, characterized by consistently elevated UV levels from January through April, with peaks reaching up to 16 in March. While the index shows slight variations in the summer months, it remains notably high at 14 in both September and October, urging residents and visitors alike to exercise caution and protect their skin when enjoying the outdoors. For a detailed look at UV levels throughout the year, check out La Union UV Index.

Maximum UV Index Levels in La Union for September

The chart shows the monthly maximum UV Index (UVI) for La Union 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 La Union typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141516151311111214141413
Data source: La Union 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 La Union

September in La Union, Peru, continues the trend of abundant sunshine, boasting 315 hours of bright, warm days. As the final month of winter transitions into spring, sunlight remains consistent with the peak sunshine of the previous months. The region experiences a gradual increase from 274 hours in January to nearly 340 hours by December, illustrating a steady climb toward longer days. This seasonal shift not only enhances the vibrant landscape but also invites outdoor exploration and adventure, making September a delightful time to embrace the sun-soaked beauty of La Union.

Monthly Sunshine Duration in La Union: September Highlighted

The September sunshine duration represents the total number of hours La Union 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.
JanFebMarAprMayJunJulAugSepOctNovDec274h303h314h322h331h308h318h324h315h331h317h340h
Data source: La Union September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in La Union During September

In September, La Union experiences a notable 49% chance of sunny weather, marking a peak in the region's transition from the cooler months of winter to a more inviting spring climate. This represents a significant improvement from the lower probabilities of sun seen in the earlier months of the year, particularly when compared to the average of around 32% from January to March. As the year progresses, the likelihood of sunshine grows, and September stands out as a promising time for enjoying outdoor activities. With the sun beginning to break through more frequently, locals and visitors can anticipate a vibrant and bright atmosphere that hints at the approaching summer months ahead.

Percentage of Sunny Days in September in La Union

The chart illustrates the percentage of sunny days in La Union 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 La Union experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec32%32%29%41%61%43%58%44%49%33%30%27%
Data source: La Union September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in La Union in September

In September, La Union, Peru, experiences a refreshing return to 12 hours of daylight, marking a transition from the slightly shorter days of the previous months. This seasonal shift showcases a striking consistency in daylight hours throughout the year, with 12 hours dominating the summer months of January through March, and a brief dip to 11 hours during the cooler winter months from April to August. As September unfolds, the days lengthen again, smoothly transitioning into the equal daylight of October through December, creating a harmonious rhythm of light that defines La Union's unique climatic pattern.

Average Daylight Hours in La Union for September

The chart illustrates the variation in daylight duration in La Union throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec12h 23m12h 15m12h 6m11h 57m11h 50m11h 47m11h 49m11h 55m12h 3m12h 13m12h 21m12h 25m
Data source: La Union daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in La Union

In September, La Union experiences a noticeable uptick in wind speed, reaching an average of 4.2 m/s (9 mph), marking it as one of the breeziest months of the year. This trend of increasing winds becomes evident from August, where average speeds hover around 4.1 m/s, creating a gentle transition into the brisk September air. With the onset of this month, the winds continue to maintain their strength, only slightly dipping in the following months of October and November. Overall, the data suggests that September serves as a pivotal time when the coastal breezes of La Union begin to assert their presence, enhancing the region's vibrant natural scenery.

Average September Wind Speed in La Union

The chart displays monthly wind speed patterns in La Union, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.33.62.93.73.93.93.84.14.2 m/s4.13.83.7
Data source: La Union September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in La Union Compares to Other Months

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

In September, the weather is pleasantly mild, with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 28°C (83°F) and an average of about 20°C (68°F). The humidity sits comfortably at 75%, with little to no precipitation, allowing for dry and sunny days. In contrast, January brings warmer temperatures, with a minimum of 18°C (65°F) and a maximum of 33°C (92°F), averaging around 25°C (78°F). However, this month experiences more humidity at 89% and increased precipitation, averaging 14 mm (0.6 in) over three days. For a closer look at the January weather specifics, you can refer to La Union weather in January.

September and February showcase distinct weather patterns. In September, temperatures are milder, with a minimum of 15°C (60°F) and a maximum of 28°C (83°F), accompanied by low humidity at 75% and almost no precipitation. This month is characterized by dry and pleasant conditions. In contrast, February experiences warmer temperatures, with a minimum of 19°C (67°F) and a maximum of 33°C (92°F). The humidity rises to 87%, and rainfall becomes more frequent, averaging 43 mm (1.7 in) over five days. For a closer look at February conditions, you can check La Union weather in February.

In September, the weather is relatively mild with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 28°C (83°F), complemented by minimal precipitation of just 2 mm and an average humidity of 75%. In contrast, March brings warmer conditions, featuring temperatures that range from a minimum of 20°C (68°F) to a maximum of 34°C (94°F), along with significantly higher precipitation levels of 97 mm spread across 7 rainy days, resulting in a humidity level of 87%. For more specific details on the weather during March, you can check La Union weather in March.

September and April offer distinctly different weather experiences. In September, temperatures range from a cooler minimum of 15°C (60°F) to a maximum of 28°C (83°F), with an average of 20°C (68°F). The month is relatively dry, receiving only 2 mm (0.1 in) of precipitation over no rainy days and maintaining a humidity level of 75%. In contrast, April sees warmer temperatures, with a minimum of 18°C (64°F), an average of 25°C (77°F), and a peak of 33°C (92°F). It is also wetter, with 19 mm (0.7 in) of rainfall spread across 2 days and a higher humidity of 86%. For more detailed insights on the weather in April, you can check La Union weather in April.

September and May present distinct weather patterns. In September, temperatures range from a minimum of 15°C (60°F) to a maximum of 28°C (83°F), with an average of 20°C (68°F) and virtually no precipitation. The humidity is relatively high at 75%. In contrast, May experiences slightly warmer temperatures, with a minimum of 16°C (61°F) and a maximum of 31°C (89°F), averaging around 23°C (74°F). This month sees a bit more precipitation, totaling 7 mm (0.3 in) over one day, and the humidity rises to 89%. For those interested in more detailed weather insights, you can check La Union weather in May.

In comparing the weather of September and June, we observe that September generally offers slightly cooler temperatures, with an average of 20°C (68°F) compared to June's average of 21°C (71°F). September also features a maximum temperature of 28°C (83°F), while June reaches up to 30°C (85°F). Both months exhibit relatively low precipitation, but June has a bit more rain, totaling 4 mm (0.2 in) on 1 day versus September's negligible 2 mm (0.1 in) with no rain days. Humidity levels are higher in June at 84%, compared to 75% in September, making June feel slightly more humid. For a detailed look at June weather, you can check La Union weather in June.

In comparing the weather between September and July, both months experience mild temperatures, but September tends to be slightly warmer. September's minimum temperature is 15°C, with an average of 20°C and a maximum reaching 28°C, whereas July has similar minimum and average temperatures at 15°C and 20°C, but a slightly lower maximum of 27°C. Precipitation levels are minimal in both months, with September receiving only 2 mm and July just 1 mm, both recording no days of rain. September also sees a slightly higher humidity level at 75% compared to July's 71%. For more specifics on July weather, you can check out La Union weather in July.

In September, the weather remains quite pleasant, with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 28°C (83°F), while maintaining an average of 20°C (68°F). Precipitation remains low at 2 mm (0.1 in) with no rainy days, and humidity is slightly higher at 75%. In comparison, August features similar temperature ranges, with minimums at 15°C (58°F), maximums reaching 27°C (81°F), and an average of 20°C (68°F). Like September, August also records minimal precipitation at 2 mm (0.1 in) and no rainy days, though it has a slightly lower humidity level of 71%. For more detailed insights on August weather, you can view La Union weather in August.

September typically offers pleasantly warm weather with average temperatures around 20°C (68°F) and a maximum of 28°C (83°F). During this month, precipitation is minimal, with only 2 mm recorded over 0 days, and humidity remains at a comfortable 75%. In contrast, October sees a slight uptick in temperatures, with an average of 21°C (69°F) and a similar maximum of 28°C (83°F). However, it experiences a bit more precipitation, totaling 7 mm over 1 day, and humidity increases slightly to 77%. For more specific details, you can check out La Union weather in October.

In September, the weather in La Union is typically warm, with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 28°C (83°F), and an average of 20°C (68°F). It enjoys very low precipitation, with just 2 mm (0.1 in) over the course of the month, and humidity sits at a moderate 75%. In contrast, November brings slightly warmer conditions, with the minimum temperature remaining the same at 15°C (59°F) but rising to a maximum of 30°C (86°F) and an average of 21°C (71°F). This month experiences a bit more rainfall, totaling 9 mm (0.4 in) over 2 days, and humidity increases to 79%. For a detailed look at how the weather varies, check out La Union weather in November.

In September, the weather is generally mild with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 28°C (83°F), averaging around 20°C (68°F). With only 2 mm of precipitation over 0 rainy days, the humidity stands at 75%, creating pleasant conditions. In contrast, December experiences warmer temperatures, with a minimum of 18°C (64°F) and a maximum reaching 31°C (88°F), averaging at 23°C (74°F). However, this month sees an increase in precipitation, totaling 14 mm over 4 days, and a rise in humidity to 86%. For a more detailed outlook on December weather, you can visit La Union weather in December.

Compare La Union's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in La Union

As September rolls into La Union, the weather paints a delightful picture, distinct from the preceding months. With mild temperatures ranging from a pleasant maximum of 28°C to an inviting average of 20°C, this month offers a respite from the heat often felt earlier in the year. Notably, precipitation is virtually absent, making September one of the driest months, which allows for uninterrupted outdoor adventures. Coupled with a comfortable humidity level of 75%, the climate strikes a perfect balance between warmth and freshness. For a deeper dive into seasonal changes, check out La Union Climate.