September Weather in La Union, Mexico

Last updated: April 22, 2025

In September, La Union, Mexico, experiences a tropical climate characterized by warm temperatures and high humidity. With maximum temperatures reaching 34°C (93°F) and average daytime conditions around 24°C (76°F), the weather can feel quite sultry. Nights bring a refreshing drop to a minimum of 15°C (60°F). This month also sees significant precipitation, totaling approximately 330 mm (13.0 in) across about 24 days, making it one of the wetter months of the year. Humidity levels remain consistently high at 84%, creating a muggy but lush environment perfect for appreciating the region’s vibrant landscapes.

September Temperature in La Union

In September, La Union, Mexico, showcases a delightful transition in temperatures as summer begins to wane. With a minimum of 15°C (60°F) and a comfortable average of 24°C (76°F), days still bask in warmth, peaking at a lively 34°C (93°F). This month is a perfect blend of lingering summer heat while nudging towards the mildness of autumn. The gradual decrease in minimum temperatures from earlier in the season indicates a shift, yet the maximum still echoes the vibrant energy of summer. Visitors can enjoy sunny days suitable for outdoor adventures, all set against the backdrop of strikingly beautiful coastal landscapes.

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.
JanFebMarAprMayJunJulAugSepOctNovDec636569737777767776736864
Data source: Temperature data for La Union 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 La Union

September marks a peak in precipitation for La Union, Mexico, as the region experiences an impressive 330 mm (13.0 in) of rainfall, making it one of the wettest months of the year. Following the trend of increasing precipitation that begins in May, September sees rainfall on 24 days, contributing to a lush and vibrant landscape. This spike is typical for the region, as it transitions from the summer months, where heavy rains can lead to a humid atmosphere and dramatic weather patterns. As the rainy season continues into October with a nearly identical precipitation amount of 329 mm, the cooling effect of the rains brings a refreshing change after the sweltering summer. Overall, this period of abundant rainfall not only showcases the dynamic nature of La Union’s climate but also emphasizes the importance of water for the local ecosystem and agriculture.

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.
JanFebMarAprMayJunJulAugSepOctNovDec11810815214019629025129733032916481
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in La Union

In September, La Union, Mexico, experiences a noticeable rise in humidity, reaching 84%. This makes it a month where the air starts to feel notably warmer and more humid compared to the drier summer months of July and August, which recorded 72% and 74% respectively. As the year progresses, humidity levels tend to fluctuate, peaking in the winter months of January and October, at an impressive 88% and 92%. The transition into fall indicates a shift from the lighter summer air, hinting at a more moist atmosphere that characterizes the region's climate as the monsoon season approaches. Overall, while September sees a marked increase, it is part of a broader trend of elevated humidity levels leading into late autumn, creating a unique, tropical ambiance.

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, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec89%86%83%80%82%79%72%74%84%92%91%91%
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, Mexico, continues to bask in the sun with a UV Index of 12, maintaining its status in the extreme exposure category, much like the preceding months from May through August. With a burn time of just 10 minutes, it’s clear that caution is essential for sunbathers and outdoor enthusiasts alike. As summer gives way to fall, the UV levels do not drop significantly, reminding visitors to remain vigilant against the sun's harmful rays. This trend of elevated UV levels underscores the importance of sun protection throughout the year, particularly in these high-exposure months. For more detailed information, explore the 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.
JanFebMarAprMayJunJulAugSepOctNovDec810111213131312121197
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, Mexico, offers a delightful transition as the month records an impressive 280 hours of sunshine. This notable figure closely follows the vibrant summer months of July and August, which boast an abundance of sunshine at 320 and 309 hours, respectively. As the summer draws to a close, September retains much of that sun-kissed warmth, though it signifies the beginning of a gradual decline. Compared to earlier months, such as May, which shines brightly with 313 hours, September still holds its own. This consistent weather pattern not only allows for enjoyable beach days but also hints at the approaching cooler months ahead, making it an ideal time for both relaxation and exploration.

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.
JanFebMarAprMayJunJulAugSepOctNovDec195h234h282h287h313h292h320h309h280h273h251h258h
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

When it comes to the likelihood of sunny weather in September in La Union, Mexico, the chances appear more modest, sitting at 19%. This figure reflects a noticeable dip compared to the preceding summer months, with July and August showing relatively higher probabilities of sunshine at 22% and 31%, respectively. As the rainy season begins to recede, one might anticipate a gradual return of bright days, particularly in the months leading up to December, where the sun's presence shines more consistently, reaching 51%. Overall, while September may not offer the best odds for sunbathers and beachgoers, it sets the stage for clearer skies as autumn approaches.

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.
JanFebMarAprMayJunJulAugSepOctNovDec24%29%41%35%32%12%22%31%19%32%33%51%
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 La Union, Mexico, September marks a subtle transition as daylight begins to wane, offering 12 hours of sunlight. This aligns with the latter part of a summer that sees the peak daylight duration at 13 hours in May through July. After basking in longer days, the sunlight gradually diminishes into the fall, with October dropping back to 11 hours. Interestingly, the pattern reveals a harmonious cycle, where daylight peaks in the summer months before receding gracefully into autumn, inviting residents and visitors alike to enjoy the balanced blend of warmth and twilight that September provides.

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.
JanFebMarAprMayJunJulAugSepOctNovDec11h 2m11h 28m12h 2m12h 36m13h 5m13h 19m13h 11m12h 46m12h 13m11h 38m11h 9m10h 55m
Data source: La Union daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in La Union

As September settles in La Union, Mexico, the wind whispers gently through the coastal landscape, with an average speed of 1.2 m/s (3 mph), mirroring the lighter breezes of earlier months. Generally characterized by its consistent calm, the summer transition sees only subtle shifts in wind patterns. While the speed remains steady through the season, dipping slightly from August's 1.3 m/s, it continues to maintain a serene atmosphere ideal for beachgoers and nature lovers alike. As the year progresses towards autumn, the winds in La Union embody a tranquil rhythm, providing a perfect backdrop for relaxation and leisure by the shore.

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.
JanFebMarAprMayJunJulAugSepOctNovDec1.21.41.51.51.51.21.21.31.2 m/s1.21.31.3
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

The weather in La Union changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in La Union and find detailed weather information for every month.

In September, the weather is generally warmer, with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 34°C (93°F) and an average of 24°C (76°F). This month experiences significant rainfall, with 330 mm (13.0 in) spread over 24 days, contributing to a high humidity level of 84%. In contrast, January brings cooler temperatures, with a minimum of 6°C (43°F), an average of 17°C (63°F), and a maximum of 31°C (88°F). Precipitation decreases to 118 mm (4.6 in) over 16 days, along with a slightly higher humidity of 88%. For a more in-depth look at January weather, check out La Union weather in January.

In September, the weather is generally warmer and more humid compared to February, with average temperatures ranging from a minimum of 15°C (60°F) to a maximum of 34°C (93°F). The month sees significant rainfall, with 330 mm (13.0 in) of precipitation spread over 24 days, contributing to a high humidity level of 84%. In contrast, February has cooler temperatures, with a minimum of 5°C (41°F) and an average of 19°C (66°F), peaking at a maximum of 33°C (92°F). Additionally, February's precipitation is considerably lower at 108 mm (4.3 in) over 15 days, while humidity remains high at 86%. For more detailed weather information, you can check La Union weather in February.

In September, the weather is characterized by warm temperatures, with a minimum of 15°C (60°F) and an average of 24°C (76°F), peaking at 34°C (93°F). This month also sees significant rainfall, with precipitation of 330 mm (13.0 in) spread over 24 days, and humidity levels remain high at 84%. In contrast, March experiences cooler conditions, with temperatures starting at a minimum of 8°C (47°F) and an average of 20°C (69°F), reaching a maximum of 33°C (92°F). Precipitation in March is much lower at 152 mm (6.0 in) over 18 days, while humidity is slightly lower at 83%. For more details, check out La Union weather in March.

In September, temperatures typically range from a minimum of 15°C (60°F) to a maximum of 34°C (93°F), with an average of 24°C (76°F). The month experiences considerable rainfall, totaling around 330 mm (13.0 in) over approximately 24 days, and a high humidity of 84%. In contrast, April offers slightly cooler temperatures, with a minimum of 11°C (52°F) and a maximum of 35°C (96°F), maintaining an average of 23°C (74°F). Precipitation is significantly lower in April, at 140 mm (5.5 in) over 13 days, with humidity levels at 80%. For more specific information about weather in April, you can check La Union weather in April.

September and May present distinct weather patterns, showcasing the transition of seasons. In September, temperatures range from a minimum of 15°C (60°F) to a maximum of 34°C (93°F), with an average of 24°C (76°F). The month is characterized by high precipitation, receiving 330 mm (13.0 in) over 24 days, and a humidity level of 84%. Conversely, May enjoys slightly warmer weather with temperatures spanning from 15°C (59°F) to a peak of 36°C (97°F) and an average of 25°C (77°F). This month is drier, with only 196 mm (7.7 in) of rain falling over 19 days and a humidity level of 82%. For a closer look at the weather in La Union during May, check out La Union weather in May.

In comparing the weather of September and June, both months exhibit warm temperatures, with September featuring a minimum of 15°C (60°F) and averaging 24°C (76°F), while June starts slightly warmer with a minimum of 17°C (63°F) and an average of 25°C (77°F). The maximum temperatures are comparable, with June peaking at 35°C (95°F) and September reaching 34°C (93°F). Precipitation levels are higher in September, with 330 mm (13.0 in) falling over 24 days compared to June's 290 mm (11.4 in) across 23 days. September also experiences higher humidity at 84%, compared to June’s 79%. For more detailed insights, you can refer to La Union weather in June.

In comparing the weather between September and July, September tends to be slightly warmer overall, with average temperatures ranging from a minimum of 15°C (60°F) to a maximum of 34°C (93°F). In contrast, July's temperatures are a bit milder, featuring a minimum of 18°C (65°F) and a maximum of 32°C (90°F), but shows higher humidity levels at 72%. Additionally, September experiences significantly more precipitation, totaling 330 mm (13.0 in) over 24 days, compared to July's 251 mm (9.9 in) over 28 days. For more detailed July weather insights, you can explore La Union weather in July.

In comparing the weather of September and August, September tends to be slightly cooler, with a minimum temperature of 15°C (60°F) and a maximum of 34°C (93°F), compared to August’s minimum of 17°C (63°F) and maximum of 32°C (91°F). Despite the warmer temperatures in August, September experiences more rainfall, totaling 330 mm (13.0 in) over 24 days, compared to August’s 297 mm (11.7 in) over 27 days. Additionally, September has a higher humidity level at 84%, while August's humidity is at 74%. For a more detailed comparison, you can check La Union weather in August.

In comparing the weather between September and October, we see only slight variations. September typically experiences a minimum temperature of 15°C (60°F) and an average of 24°C (76°F), peaking at 34°C (93°F). With 330 mm (13.0 in) of precipitation over 24 days, September has a relatively high humidity level of 84%. In contrast, October sees a slight drop in temperatures, with a minimum of 14°C (57°F), an average of 23°C (73°F), and a maximum of 33°C (92°F). Interestingly, October's precipitation is almost equivalent at 329 mm (13.0 in) but occurs over fewer days (19), leading to a higher humidity level of 92%. For more detailed information on weather conditions specific to October, you can check La Union weather in October.

In September, the weather is characterized by warm temperatures, with a minimum of 15°C (60°F) and an average high of 34°C (93°F). The month also experiences significant rainfall, totaling 330 mm (13.0 in) over 24 days, accompanied by a high humidity level of 84%. In contrast, November sees cooler temperatures, with a minimum of 4°C (40°F) and a comfortable average of 20°C (68°F), peaking at 30°C (87°F). The precipitation drops to 164 mm (6.4 in) over 17 days, while humidity rises slightly to 91%. For a more detailed look at weather conditions specific to November, check out La Union weather in November.

In September, the weather is typically warm and humid, with temperatures ranging from a cool 15°C (60°F) at night to a peak of 34°C (93°F) during the day. This month experiences substantial rainfall, totaling 330 mm (13.0 in) over 24 days, contributing to a high humidity level of 84%.

In contrast, December brings a noticeable drop in temperature, with min values dropping to 4°C (39°F) and average daily temperatures around 18°C (64°F), reaching a maximum of 30°C (86°F). Transitions from September to December include significantly reduced precipitation, amounting to just 81 mm (3.2 in) over 11 days, while humidity remains relatively high at 91%. For more detailed insights, check out 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 in, La Union experiences a distinct shift in weather, marked by higher humidity levels and increased rainfall that sets it apart from the drier months. With an average temperature hovering around 24°C, the warmth is complemented by the occasional refreshing showers, making the environment feel lush and vibrant. Travelers should be prepared for the frequent precipitation, which can occur on nearly three-quarters of the days this month. Despite the rain, the landscape thrives, showcasing the beauty of La Union during this transitional period. For a deeper understanding of the climatic patterns throughout the year, explore more at La Union Climate.