Last updated: August 21, 2025
In September, San Andres, Colombia, experiences a tropical climate characterized by temperatures ranging from a pleasant 12°C (55°F) at night to a maximum of 26°C (79°F) during the day, with an average temperature of 18°C (66°F). This month is marked by significant precipitation, totaling 418 mm (16.5 in), and rainfall occurs nearly every day, contributing to the island's lush vegetation. Humidity levels hover around a high 88%, creating a warm and humid atmosphere that captivates visitors. The recurring showers provide a unique charm to San Andres, making September a vibrant yet wet month for both locals and travelers alike.
In September, temperatures in San Andres, Colombia continue to reflect the island's tropical charm, with minimums around 12°C (55°F) and a comfortable average of 18°C (66°F). The daytime highs peak at 26°C (79°F), hinting at a perfect blend of warm sunshine and gentle sea breezes. As the month transitions into autumn, the weather remains consistent with the preceding months, showcasing a slight dip in maximum temperatures compared to the warmer summer months of July and August. This stability makes September an inviting time for travelers, where the mild climate perfectly complements the island's stunning landscapes and vibrant culture.
In September, San Andres, Colombia experiences a significant increase in precipitation, accumulating 418 mm (16.5 in) over the course of the month, establishing it as one of the wettest periods of the year. This substantial rainfall is spread across 30 days, maintaining a consistent pattern of moisture typical for the month. Following the peak months of May and June, where rainfall reached record levels, September continues the trend of heavy precipitation, although with slightly reduced intensity. The consistent pattern of rain throughout September indicates the ongoing influence of tropical weather systems, providing vital water supplies while also reminding residents of the island's lush, vibrant ecosystem.
In September, San Andres, Colombia, experiences a notable humidity level of 88%, a figure that reflects the island's tropical climate. This month is part of a trending pattern where humidity consistently remains high, particularly from May to November, with levels soaring to 89% in the peak months of June and October. Although slightly lower than the preceding August's 87%, September's humidity still contributes to the lush, verdant landscapes for which the region is famous. The elevated humidity levels throughout the latter part of the year not only create a rich environment for flora but also signify the onset of the wet season, offering a unique experience for both residents and visitors alike.
In September, the UV Index in San Andres, Colombia remains high at 14, categorizing the exposure level as extreme with a burn time of just 10 minutes. This trend is consistent with previous months such as July and August, where the UV Index also stood at 14. The peak occurs in April, hitting 16, followed closely by February and March at 15. Despite a slight dip towards the end of the year—with indices dropping to 13 in November and 12 in December—the overall pattern highlights the need for vigilant sun protection year-round. For more detailed information, check out the San Andres UV Index.
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September in San Andres, Colombia, offers a delightful blend of sun as the island enjoys 239 hours of sunshine. This month maintains a steady brightness, sitting comfortably between the peak summer months of January and February, which boast over 250 hours each. While sunshine hours dip slightly from the vibrant summer, they are far from lackluster. As the year progresses, September stands out, bridging the gap between the sunny season and the upcoming cooler months, which see a modest resurgence in sunshine by December. With this consistent glow, September invites both relaxation and adventure, making it an ideal time to explore the island’s natural beauty.
In September, the likelihood of sunny weather in San Andres, Colombia remains modest, with only a 7% chance of sunshine. This aligns with the general trend observed during the year, where the chances of sunny days dip significantly from the slightly brighter months of January and February, which boast around 25% and 22% respectively. As we move through the year, the probability of sun dwindles, reaching its lowest point in the spring and summer months. While September does not offer much in the way of sunny skies, it does hint at a gradual recovery, with the chances improving slightly in October, which presents a 6% chance, showing a subtle pattern of variability that reflects the tropical climate of the region.
September in San Andres, Colombia, continues the trend of abundant sunshine with 12 hours of daylight, maintaining the length seen throughout the summer months. This consistent daylight duration not only enhances the island's vibrant atmosphere but also provides ample time for visitors to explore its stunning beaches and lush landscapes. As the year transitions toward October, daylight begins to taper off to 11 hours, signaling the approach of shorter days. Overall, September exemplifies the island's near-equatorial positioning, offering a delightful blend of sunlight and warmth that enriches the tropical experience.
As September graces San Andres, Colombia, it brings with it a gentle breeze, with average wind speeds lingering around 0.9 m/s (2 mph). This mild wind is consistent with the summer months, revealing a trend of stability in airflow that stretches from June to September. In fact, September's breeziness mirrors that of its preceding months, indicating a serene climate that invites relaxation. As the calendar shifts to October, a subtle decrease to 0.8 m/s (2 mph) suggests the approach of change, yet the gentle winds of September still embody the island's tranquil charm.
Weather in San Andres varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Andres, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is characterized by a mild average temperature of 18°C (66°F), with daily highs reaching up to 26°C (79°F). However, this month also sees significant rainfall, totaling 418 mm (16.5 in) over 30 days, leading to a high humidity level of 88%. In contrast, January presents slightly cooler conditions with an average temperature similar to September at 18°C (65°F), but boasts a higher maximum of 27°C (80°F) and significantly less precipitation at 105 mm (4.1 in) over just 18 days. The humidity in January is also lower at 74%, making it a more comfortable month overall. For more details, visit San Andres weather in January.
September and February exhibit distinct weather characteristics. In September, the temperatures range from a minimum of 12°C (55°F) to a maximum of 26°C (79°F), with an average of 18°C (66°F). This month is marked by significant precipitation, totaling 418 mm (16.5 in) across 30 days, contributing to a high humidity level of 88%. In contrast, February features slightly cooler mornings with a minimum temperature of 9°C (49°F) and a maximum of 27°C (80°F), while maintaining a similar average of 18°C (65°F). Precipitation is much lower in February, with 125 mm (4.9 in) spread over 21 days, and humidity drops to 68%. For more detailed information on February weather, visit San Andres weather in February.
In September, the weather features a minimum temperature of 12°C (55°F) and an average of 18°C (66°F), with maximum highs reaching 26°C (79°F). The month is characterized by high humidity at 88% and significant rainfall, accumulating 418 mm (16.5 in) over 30 days. In contrast, March maintains similar temperature averages, with a minimum of 12°C (54°F) and a maximum of 26°C (79°F). However, it experiences lower humidity at 65% and less precipitation, totaling 267 mm (10.5 in) across 28 days. For more detailed information on March weather, you can check San Andres weather in March. Overall, March tends to be drier and less humid compared to the wet and humid conditions of September.
September and April exhibit some similarities in temperature, with both months featuring maximum temperatures around 26°C (79°F to 80°F). However, September tends to be slightly cooler, with an average temperature of 18°C (66°F), compared to April's average of 19°C (66°F). A notable difference lies in the precipitation levels, where September receives a significant 418 mm (16.5 in) of rain over 30 days, making it a much wetter month than April, which has 298 mm (11.7 in) of rainfall across 29 days. Additionally, the humidity in September is quite high at 88%, whereas April maintains a lower, more comfortable level of 73%. For more detailed information, visit San Andres weather in April.
September and May exhibit similar temperature patterns, with both months seeing minimums around 12-13°C (55°F) and maximums reaching 26°C (79-80°F). However, May tends to be slightly warmer on average, averaging 19°C (66°F) compared to September's 18°C (66°F). Precipitation levels are notably high in both months, but May receives a bit more, with 453 mm (17.8 in) compared to September's 418 mm (16.5 in). Both months experience high humidity levels at 88%, contributing to a lush and vibrant atmosphere. For a deeper look into the climate specifics for May, check out San Andres weather in May.
In comparing the weather of September and June, both months exhibit similar temperature ranges, with September having a minimum of 12°C (55°F) and a maximum of 26°C (79°F), while June slightly edges with a minimum of 13°C (55°F) and a maximum of 27°C (80°F). The average temperatures in both months are closely aligned, with September averaging 18°C (66°F) and June averaging 19°C (66°F). However, September experiences significantly more precipitation, totaling 418 mm (16.5 in) compared to June's 373 mm (14.7 in), despite the same number of rainy days at 30. Humidity levels are slightly higher in June at 89%, compared to 88% in September. For a more detailed look at the weather in June, you can refer to San Andres weather in June.
In comparing the weather of September and July, both months exhibit mild temperatures but with some notable differences. September sees a minimum temperature of 12°C (55°F), an average of 18°C (66°F), and a maximum of 26°C (79°F), whereas July has slightly warmer readings with a minimum of 13°C (56°F), an average of 19°C (66°F), and a maximum of 27°C (81°F). Additionally, September experiences higher precipitation at 418 mm (16.5 in) over 30 days, compared to July's 319 mm (12.6 in) across 31 days. Humidity levels remain quite high in both months, with September at 88% and July at 89%. For more detailed information, you can check San Andres weather in July.
In comparing the weather between September and August, both months experience similar temperature ranges, with September averaging slightly lower at 18°C (66°F) compared to August's average of 19°C (66°F). Both months also share the same minimum and maximum temperatures of 12°C (53°F) and 26°C (80°F), respectively. However, September sees a significant increase in precipitation, totaling 418 mm (16.5 in) over 30 days, compared to August's 328 mm (12.9 in) over the same duration. The humidity remains relatively high in both months, with September at 88% and August at 87%. For detailed information on August weather, you can visit San Andres weather in August.
In comparing the weather of September and October, both months exhibit similar temperature ranges, with September experiencing a minimum of 12°C (55°F), an average of 18°C (66°F), and a maximum of 26°C (79°F). In October, the minimum remains the same at 12°C (53°F), while the average temperature is slightly lower at 18°C (65°F), and the maximum rises slightly to 27°C (81°F). Precipitation decreases from 418 mm (16.5 in) in September to 377 mm (14.8 in) in October, although both months have rain on 30 days. Humidity is slightly higher in October at 89% compared to 88% in September. For more detailed insights into October weather, you can check San Andres weather in October.
In September, the weather is characterized by a slightly broader temperature range, with minimums around 12°C (55°F), averages of 18°C (66°F), and maximums reaching 26°C (79°F). The month sees a significant amount of rainfall, totaling 418 mm (16.5 in) across 30 days and maintaining high humidity levels at 88%. In contrast, November experiences similar average temperatures, with a minimum of 13°C (55°F), an average of 18°C (65°F), and a maximum of 25°C (78°F). However, the precipitation is notably lower at 249 mm (9.8 in) over 28 days, leading to a slightly higher humidity level of 90%. Overall, while both months are quite humid and mild, November offers a less rainy experience compared to September. For more detailed information, you can check San Andres weather in November.
In comparing the weather of September and December, we find that both months share similar average temperatures, hovering around 18°C (66°F). However, September tends to be slightly warmer, with maximum temperatures reaching up to 26°C (79°F), compared to December's maximum of 25°C (78°F). Humidity levels remain high in both months, with September at 88% and December slightly lower at 85%. A notable difference is the significant decrease in precipitation: September receives 418 mm (16.5 in) of rain over 30 days, while December sees only 125 mm (4.9 in) over 25 days, making December feel drier and more pleasant. For more detailed insights, you can check out San Andres weather in December.
As September unfolds in San Andres, visitors can expect cooler temperatures compared to the warmer months, with average highs around a comfortable 26°C. However, this month is renowned for its high humidity and frequent rainfall, marking it as one of the wettest periods of the year. While the tropical climate ensures pleasant warmth, the 418 mm of rain over a full month may surprise those unfamiliar with its tendency for daily showers. This blend of conditions makes September distinctly different, inviting travelers to experience a lush and vibrant environment. For a detailed overview of what to expect throughout the year, check out San Andres Climate.