Last updated: August 21, 2025
September in Retalhuleu, Guatemala offers a warm, tropical climate marked by a maximum temperature reaching 34°C (93°F) and an average of 26°C (80°F), creating a cozy atmosphere for visitors. With a minimum temperature of 21°C (71°F), evenings remain pleasantly warm. However, travelers should be prepared for significant rainfall, as the region experiences 418 mm (16.5 in) of precipitation over 29 days, contributing to its lush landscapes. The humidity levels hover around 82%, enhancing the tropical feel of this vibrant destination.
In September, Retalhuleu, Guatemala, experiences a delightful transition as temperatures remain warm but slightly cooler compared to the peak summer months. With minimums hovering around 21°C (71°F) and an average of 26°C (80°F), the days are comfortable. The maximum temperatures can still reach 34°C (93°F), offering a taste of summer’s lingering warmth. As the month unfolds, the pattern reveals a consistent trend: temperatures gradually cool down leading into the rainy season, striking a balance between sun-soaked afternoons and the refreshing relief of evening breezes. This makes September an inviting time for visitors to enjoy the vibrant culture and lush landscapes of Retalhuleu.
September in Retalhuleu, Guatemala, sees a significant increase in precipitation, with 418 mm (16.5 in) of rainfall recorded over 29 days. This trend follows the peak rainy season that begins in May, which brings an astounding 447 mm (17.6 in) of rain, and continues through the summer months, marking September as one of the wettest in the year. The consistent rainfall during this month not only sustains the region's lush landscape but also sets the stage for transitioning into October, which remains similarly damp with 378 mm (14.9 in) of precipitation. As the rainy season reaches its climax, the increased moisture supports the vibrant biodiversity of the area while also presenting challenges, such as flooding and soil erosion, that the local communities must navigate.
In September, Retalhuleu, Guatemala, experiences high humidity levels, reaching 82%, matching the peak humidity seen in August. This period marks a notable humid trend for the region, as it transitions from the lower humidity months of January through April, where levels dipped to a refreshing 57%. As the rainy season progresses, humidity tends to rise, peaking again in October at 83%. The consistency of elevated moisture in the air throughout late summer and early fall creates a lush environment, emphasizing the tropical nature of this vibrant region. While humidity levels fluctuate throughout the year, September signifies the transition into the most humid time, setting the stage for a rich and fertile landscape.
In September, Retalhuleu maintains its trend of high UV exposure, with an impressive UV Index of 13, categorized as extreme. This level indicates that individuals should be particularly cautious, as the burn time is a mere 10 minutes. Following a pattern established earlier in the year, September continues to showcase the persistent intensity of sunlight in this region, similar to the months prior, from February through August. As the rainy season begins to wind down, the UV levels remain steadfastly high, reminding residents and visitors alike to prioritize sun safety. For more details about UV exposure throughout the year, check out the Retalhuleu UV Index.
UV Risk Categories
September in Retalhuleu, Guatemala, showers its residents with 281 hours of sunshine, continuing a trend of vibrant summer days as the rainy season begins to ease. This month, while slightly cooler than the sun-drenched highs of March (322 hours) and April (315 hours), still boasts a generous amount of sunlight compared to earlier months. With summer's warmth lingering from July (312 hours) and August (299 hours), September offers a delightful balance of bright days and the refreshing onset of fall. As the year progresses towards October, which typically sees a minor dip to 278 hours, September remains a cherished time for outdoor activities, basking in the golden glow of late summer before the clouds return.
In Retalhuleu, Guatemala, September marks a shift in weather patterns, with the likelihood of sunny days dropping to just 16%. This trend follows a gradual decline from the sunnier months of January through April, where the chances hovered between 42% and 72%. As the rainy season peaks in May and June, the expectation of sunshine decreases dramatically, reaching a low that makes September one of the cloudiest months of the year. This seasonal pattern suggests that travelers seeking sunny skies may want to plan their visits outside of this time frame, as October offers a slight rebound to 31% sunshine. Ultimately, September's mix of cloud cover and limited sunlight embodies the transition into Guatemala's wetter autumn months.
In Retalhuleu, Guatemala, the rhythm of daylight reveals an intriguing pattern throughout the year. Notably, September marks a continuation of the 12-hour daylight experience that begins in March and persists through to August. This consistent duration not only offers ample time for outdoor activities and exploration but also reflects the region's relatively stable climate. As the days gradually shorten into October, the shift to 11 hours of daylight begins, reminiscent of the earlier months of the year. Thus, September stands out as a vibrant month, maintaining a balance of light that fosters both productivity and leisure in this beautiful part of Central America.
As September sets in Retalhuleu, Guatemala, the gentle whispers of the wind greet the changing season, with an average speed of 1.3 m/s (3 mph). This month mirrors the breeziness of the summer, maintaining a consistent pace that hovers slightly above the fluctuations seen in the previous months. While May experiences a dip with the lowest average wind speed at 1.1 m/s (2 mph), the winds begin to strengthen again in June and July, leading into a September that welcomes the subtle cooling of the air. Notably, the month stands out as a prelude to October's softer breezes; September's winds are a gentle reminder of the nature's rhythm, bridging the warm summer months with the cooler approach of fall, creating an inviting atmosphere that enhances the serene beauty of this vibrant region.
Weather in Retalhuleu varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Retalhuleu, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present notably different weather patterns. In September, temperatures range from a minimum of 21°C (71°F) to a maximum of 34°C (93°F), accompanied by high humidity at 82%. This month experiences significant rainfall, with an impressive 418 mm (16.5 in) spread over 29 days. In contrast, January has a slightly cooler minimum temperature of 18°C (65°F) while maintaining the same maximum of 34°C (93°F). Rainfall plummets to just 24 mm (1.0 in) over six days, and humidity decreases to 76%. For more detailed information, you can check Retalhuleu weather in January.
September and February showcase distinct weather patterns. September experiences higher average temperatures, ranging from a minimum of 21°C (71°F) to a maximum of 34°C (93°F), while February's temperatures are slightly cooler, with a minimum of 19°C (66°F) and a maximum of 36°C (97°F). Notably, September is characterized by significant rainfall, with 418 mm (16.5 inches) falling over 29 days, leading to high humidity levels of 82%. In contrast, February is remarkably drier, with only 18 mm (0.7 inches) of precipitation over just 3 days and a lower humidity of 68%. For further details on the February weather in Retalhuleu, visit Retalhuleu weather in February.
In September, the weather is characterized by higher humidity and significant rainfall, with average temperatures ranging from a minimum of 21°C (71°F) to a maximum of 34°C (93°F) over 29 days of precipitation totaling 418 mm (16.5 in). In contrast, March presents a warmer and drier month, showcasing temperatures that range from a minimum of 20°C (68°F) to a maximum of 36°C (96°F), with only 44 mm (1.7 in) of precipitation spread across 10 days. Additionally, March boasts a lower humidity level of 59%, making it feel considerably less muggy than September. For a closer look at what to expect, check out the full details Retalhuleu weather in March.
When comparing the weather in September and April, notable differences emerge. September features a minimum temperature of 21°C (71°F) and averages around 26°C (80°F), but it can reach highs of 34°C (93°F). This month is characterized by heavy rainfall, accumulating 418 mm (16.5 in) over 29 days, alongside high humidity levels of 82%. In contrast, April experiences slightly cooler nighttime temperatures, also starting at a minimum of 21°C (70°F), but it averages higher at 28°C (83°F) and can soar to a maximum of 37°C (99°F). Rainfall is significantly lighter in April, totaling only 105 mm (4.1 in) across 17 days, which coincides with lower humidity levels at 57%. For more details, you can refer to Retalhuleu weather in April.
In comparing the weather of September and May, we see notable differences in temperature and humidity. September typically has a minimum temperature of 21°C (71°F), an average of 26°C (80°F), and a maximum of 34°C (93°F), accompanied by high humidity levels at 82%. In contrast, May boasts slightly warmer temperatures, with a minimum of 22°C (72°F), an average of 27°C (81°F), and a maximum reaching 37°C (98°F). Both months feature considerable precipitation, with September receiving 418 mm (16.5 in) over 29 days and May slightly higher at 447 mm (17.6 in) over 31 days. The humidity in May, however, is lower at 65%, making it feel less oppressively humid than September. For a detailed look at May weather in Retalhuleu, check out Retalhuleu weather in May.
In comparing the weather of September and June, we see that both months experience similar high temperatures, with maximums reaching up to 34°C (93°F). However, September has slightly lower average temperatures, with a minimum of 21°C (71°F) compared to June's 22°C (72°F). One of the most significant differences is in precipitation; September sees a higher total rainfall of 418 mm (16.5 in) over 29 days, while June has less at 373 mm (14.7 in) across the same number of days. Additionally, September is notably more humid, with levels at 82% compared to June's 66%. For a detailed overview of June weather, you can visit Retalhuleu weather in June.
In comparing the weather between September and July, both months experience similar temperature ranges, with minimums around 21°C (71°F) and maximums peaking at 34°C (93°F). However, September tends to be slightly cooler on average, with a temperature of 26°C (80°F) compared to July’s 27°C (81°F). One notable difference is the increased precipitation in September, where it receives 418 mm (16.5 in) over 29 days, as opposed to July’s 292 mm (11.5 in) over 26 days, resulting in a significantly higher humidity level of 82% in September, compared to 75% in July. For more detailed insights about the weather in July, you can visit Retalhuleu weather in July.
In comparing the weather between August and September, both months exhibit similar temperature ranges, with September slightly cooler, experiencing a minimum temperature of 21°C (71°F) and an average of 26°C (80°F), compared to August's minimum of 22°C (72°F) and average of 27°C (80°F). However, September sees increased precipitation, with 418 mm (16.5 in) spread over 29 days, compared to August's 362 mm (14.3 in) over the same number of days. Despite the higher rainfall in September, humidity remains consistent at 82% for both months. For more specific details on August weather, please refer to Retalhuleu weather in August.
September and October present similar weather patterns, but there are some notable differences. In September, the temperatures range from a minimum of 21°C (71°F) to a maximum of 34°C (93°F), with an average of 26°C (80°F). Precipitation is significantly high at 418 mm (16.5 in), occurring on 29 days, while humidity sits at 82%. In contrast, October experiences slightly warmer minimum temperatures at 22°C (71°F) and a modest drop in maximum temperatures, reaching 33°C (92°F). The rainfall also decreases to 378 mm (14.9 in) over the same number of days, and humidity rises slightly to 83%. For more detailed information about October weather, you can visit Retalhuleu weather in October.
In September, the weather is characterized by high humidity of 82% and substantial rainfall, accumulating 418 mm over 29 days. The temperatures range from a minimum of 21°C (71°F) to a maximum of 34°C (93°F), with an average of 26°C (80°F). In contrast, November offers a slightly warmer average temperature at 27°C (80°F) while maintaining the same minimum and maximum extremes as September. However, it experiences significantly less precipitation at 106 mm over just 14 days, and humidity dips slightly to 80%. For more detailed information, you can check Retalhuleu weather in November.
In comparison to September, December features slightly cooler temperatures, with a minimum of 19°C (67°F), while still maintaining an average of 26°C (80°F) and a maximum reaching up to 34°C (94°F). Notably, December experiences significantly less rainfall, accumulating only 26 mm (1.0 in) over just 6 days, in contrast to September’s substantial 418 mm (16.5 in) spread over 29 days. Additionally, humidity levels decrease to 76% in December from the high of 82% in September, resulting in a more comfortable environment. For those interested in specific December conditions, you can explore more at Retalhuleu weather in December.
As September unfolds in Retalhuleu, the weather takes on a distinct character with notably higher humidity and frequent rainfall, setting it apart from other months. While the temperatures remain warm, peaking at a maximum of 34°C, the average cools slightly, leading to a more refreshing atmosphere amidst the showers. The region experiences nearly 29 days of rainfall, totaling 418 mm, making it one of the wettest months of the year. This combination of conditions fosters a lush, vibrant environment, appealing to those who appreciate the beauty that comes with the tropical rains. For a deeper understanding of how these factors play into the overall climate of Retalhuleu, check out Retalhuleu Climate.