Last updated: April 22, 2025
September in San Andres, Mexico brings a blend of mild temperatures and considerable precipitation. With maximum temperatures reaching up to 25°C (78°F) and an average of 16°C (61°F), the weather is pleasantly comfortable, although cooler nights can drop to 6°C (44°F). This month is also characterized by significant rainfall, totaling 202 mm (8.0 in) over approximately 21 days, resulting in a humidity level of 82%. Travelers should prepare for wet conditions while enjoying the lush landscape that September's rains foster.
In September, temperatures in San Andres, Mexico, begin to show the subtle hints of autumn, with a minimum temperature of 6°C (44°F), an average of 16°C (61°F), and a maximum of 25°C (78°F). This month marks a slight cooling trend from the summer's warmth, providing a refreshing change without the sudden chill of winter. While September’s temperatures maintain a comfortable range, the generally mild weather encourages outdoor activities, making it a delightful time for exploration and relaxation in this charming locale. As the month progresses, the gradual drop in temperatures signals the advent of fall, inviting visitors to enjoy the crisp air and vibrant landscape.
In September, San Andres experiences a significant uptick in precipitation, with 202 mm (8.0 in) of rainfall over 21 days, making it one of the wettest months of the year. This surge follows a summer filled with heavy rains, especially in June, July, and August, where the average monthly rainfall hovered around 167 mm (6.6 in). As the rainy season peaks in September, the lush surroundings transform into a vibrant green, offering a beautiful contrast to the previous drier months. However, as October approaches, a noticeable decline in both precipitation and rainy days occurs, signaling a gradual transition away from this wetter period. This pattern highlights the region's distinct seasonal variations, showcasing the captivating rhythm of San Andres’ climate.
In September, San Andres experiences a notable rise in humidity, reaching 82%, which marks a significant increase from the drier months of mid-summer, particularly July and August, where levels dipped to 68% and 70%, respectively. This uptick in moisture can create a more tropical feel as the summer heat begins to fade, setting the stage for the wetter months ahead. As the year progresses into the fall, humidity levels continue their ascent, peaking in October at a substantial 91%. Overall, September serves as a transitional month, highlighting the gradual return to more humid conditions that characterize the latter part of the year in this picturesque coastal destination.
September in San Andres, Mexico, continues the trend of intense sun exposure, maintaining a high UV Index of 14, classified as extreme. This level of ultraviolet radiation demands caution, with a burn time of just 10 minutes for unprotected skin. As this month follows several others marked by similarly oppressive indices, it underscores the necessity for sun safety practices, including wearing protective clothing and sunscreen. As the year transitions towards the cooler months, the UV Index will eventually decline, but for now, those enjoying the beautiful San Andres beaches should remain vigilant. For more information about the UV levels throughout the year, visit San Andres UV Index.
UV Risk Categories
September in San Andres, Mexico, offers a warm embrace of sunshine with an average of 265 hours of glorious sunlight. While this marks a slight dip from the peak of 335 hours in May, the month maintains a vibrant atmosphere as it transitions into the cooler months. The summer months of June through August witness a gradual decrease in sunshine hours, yet September holds on to the last vestiges of summer warmth before the autumn months bring a slight uptick in sunlight once again. This ebb and flow of sunlight throughout the year not only enhances the island's breathtaking landscapes but also invites visitors to enjoy the golden hues of early fall along the picturesque shores.
September in San Andres, Mexico, marks a significant dip in the likelihood of sunny weather, with only a 12% chance of sun. This stark contrast follows a pattern observed throughout the summer months, where sunny days become increasingly rare, with July and August similarly showcasing low probabilities of 15% and 19%, respectively. As autumn approaches, the weather begins to transition, leading to a gradual increase in sunny days in the following months, notably 27% in October and rising to 45% by November. Therefore, if you're planning a trip in September, it's wise to prepare for more overcast skies rather than basking in the sun.
In September, daylight in San Andrés, Mexico, is 12 hours, marking a transitional period as the days begin to shorten slightly from the peak summer months. The daylight duration has steadily increased from 11 hours in January and February to a high of 13 hours from May to August. This gradual shift reflects the region's warm climate, where summer days invite vibrant outdoor activities, while September still benefits from generous sunlight before the approach of fall. As the year progresses, September stands as a blend of lingering summer light and the gentle onset of the shorter days that characterizes the approaching autumn months.
In September, the gentle winds of San Andres, Mexico, reach their lowest average speed of 1.9 m/s (4 mph), marking a tranquil pause as the summer season transitions into autumn. Though this suggests a slight decrease in wind activity compared to the bustling breezes of August, the overall trend reveals a consistency in mild wind speeds throughout the year. With the winds historically hovering around 2.0 m/s (5 mph) during the preceding months, September’s calm provides a charming backdrop for beachgoers and nature enthusiasts alike, embodying the serene essence of coastal life in this vibrant locale. As the year progresses into the more blustery October and November, this brief lull in September offers a perfect moment to appreciate the tranquil beauty of San Andres.
The weather in San Andres 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 San Andres and find detailed weather information for every month.
In September, the weather is generally mild, with temperatures ranging from a minimum of 6°C (44°F) to a pleasant average of 16°C (61°F) and peaking at a comfortable 25°C (78°F). However, this month experiences significant rainfall, with approximately 202 mm (8.0 in) of precipitation over 21 days, contributing to a high humidity level of 82%.
Conversely, January presents a stark contrast with colder temperatures, featuring a minimum of -1°C (30°F) and an average of 12°C (54°F), while still reaching a maximum of 26°C (79°F). This month is much drier, with only 11 mm (0.4 in) of rain falling over just 2 days, and a slightly higher humidity at 84%. For those interested in more detailed weather patterns, check San Andres weather in January.
In comparing the weather between September and February, September tends to be cooler and wetter, with average temperatures ranging from a minimum of 6°C (44°F) to a maximum of 25°C (78°F). The month sees significant rainfall, totaling 202 mm (8.0 in) over 21 days, and has a humidity level of 82%. In contrast, February offers milder conditions, with temperatures varying from a minimum of 2°C (36°F) to a maximum of 29°C (85°F). This month experiences much less rainfall, only 14 mm (0.6 in) over just 3 days, and a slightly lower humidity at 78%. For more insights on February weather, you can check out San Andres weather in February.
In comparing the weather between September and March, we observe notable differences in temperature and precipitation. September typically experiences a wider range, with minimum temperatures around 6°C (44°F) and maximums reaching 25°C (78°F), while March's temperatures range slightly lower, from a minimum of 4°C (39°F) up to a warmer maximum of 31°C (88°F). Precipitation levels in September are considerably higher, averaging 202 mm (8.0 in) over 21 days, compared to March's much drier conditions with only 24 mm (0.9 in) spread across just 6 days. Additionally, September's humidity is generally higher at 82%, compared to March's 75%. To learn more about March weather in specific locations, you can check San Andres weather in March.
In comparing the weather of September and April, we notice significant differences. September offers a cooler climate with an average temperature of 16°C (61°F), reaching a maximum of 25°C (78°F), while April tends to be warmer, averaging 18°C (64°F) and peaking at 31°C (88°F). Additionally, September is quite wet, receiving 202 mm (8.0 in) of precipitation over 21 days, whereas April experiences much lighter rainfall, totaling just 40 mm (1.6 in) over 8 days. Humidity levels are also higher in September at 82%, compared to April's more comfortable 70%. For more specific details about the weather during April, you can visit San Andres weather in April.
September and May present distinct contrasts in weather conditions. In September, temperatures range from a cooler minimum of 6°C (44°F) to a maximum of 25°C (78°F), with an average of 16°C (61°F). This month also experiences significant rainfall, accumulating 202 mm (8.0 in) over 21 days, contributing to high humidity levels at 82%. Conversely, May brings warmer temperatures, with a minimum of 8°C (46°F), an average of 19°C (66°F), and a peak of 32°C (90°F). Furthermore, May sees considerably less precipitation, totaling just 55 mm (2.2 in) over 10 days, and lower humidity at 77%. For more details on the weather in May, you can check San Andres weather in May.
September and June present distinctly different weather patterns. In September, the average temperature is slightly lower, ranging from a minimum of 6°C (44°F) to a maximum of 25°C (78°F), while June enjoys warmer temperatures with a minimum of 8°C (46°F) and a peak of 31°C (87°F). Additionally, September experiences higher precipitation, averaging 202 mm (8.0 in) over 21 days, compared to June's 171 mm (6.7 in) across 18 days. Humidity levels are also higher in September at 82%, contrasting with June's more comfortable 76%. For a detailed look at June weather, you can visit San Andres weather in June.
In comparing the weather between September and July, it’s evident that July tends to be slightly warmer, with minimum temperatures averaging around 9°C (49°F) compared to September's cooler minimum of 6°C (44°F). Both months have similar average temperatures of around 16°C (61°F), but July features a marginally higher maximum temperature of 26°C (79°F) compared to September's 25°C (78°F). Precipitation is notably higher in September, with 202 mm (8.0 in) falling over 21 days, making it a wetter month than July, which receives 167 mm (6.6 in) of rain over 23 days. Additionally, September experiences higher humidity at 82%, while July has a more comfortable 68%. For a closer look at July conditions, you can check out San Andres weather in July.
In comparing the weather between September and August, September tends to be cooler with a minimum temperature of 6°C (44°F), compared to August's minimum of 9°C (49°F). Both months have an average temperature of around 16°C (61°F), but August reaches a slightly higher maximum of 27°C (81°F) compared to September's 25°C (78°F). Precipitation is notably higher in September, with 202 mm (8.0 in) falling over 21 days, while August sees 164 mm (6.4 in) over 23 days. Additionally, humidity levels are higher in September at 82%, compared to August's 70%. For a more detailed look at August weather, you can visit San Andres weather in August.
In September, the weather tends to be milder with average temperatures ranging from a minimum of 6°C (44°F) to a maximum of 25°C (78°F). This month also sees significant rainfall of 202 mm (8.0 in) over 21 days, accompanied by a relatively high humidity level of 82%. In contrast, October experiences slightly cooler temperatures, with a minimum of 4°C (39°F) and an average of 15°C (59°F), while still reaching a maximum of 26°C (78°F). The precipitation in October decreases to 95 mm (3.7 in), spread over 15 days, but humidity rises slightly to 91%. For more detailed insights on October weather, check out San Andres weather in October.
September and November exhibit noteworthy differences in weather conditions. In September, temperatures range from a minimum of 6°C (44°F) to a maximum of 25°C (78°F), with an average temperature of 16°C (61°F). The month is characterized by significant precipitation, totaling 202 mm (8.0 in) over 21 days, and a humidity level of 82%. In contrast, November sees cooler temperatures, with a minimum of 1°C (34°F) and an average of 13°C (56°F), while the maximum temperature can reach 26°C (79°F). Rainfall is notably less, with only 22 mm (0.9 in) occurring over just 5 days, and humidity rises slightly to 89%. For more detailed information, you can check San Andres weather in November.
In September, the weather is generally mild, with temperatures ranging from a minimum of 6°C (44°F) to a maximum of 25°C (78°F). This month experiences significant rainfall, totaling 202 mm (8.0 in) over 21 days, along with a humidity level of 82%. In contrast, December brings cooler temperatures, with a minimum of -1°C (30°F) and an average of 12°C (54°F), while still reaching up to 25°C (77°F) on warmer days. Notably, December sees far less precipitation, with only 5 mm (0.2 in) over just 1 day, and humidity slightly increases to 88%. For more detailed insights, check San Andres weather in December.
As September rolls into San Andres, the weather presents a unique interplay between warmth and moisture that sets it apart from other months. With an average temperature hovering around a comfortable 16°C (61°F), the air is more humid, reflecting the 82% humidity that contributes to a sense of balmy heaviness. However, don’t forget your umbrella—this month often experiences an uptick in rainfall, with precipitation contributing to 202 mm over 21 days. The maximum temperature reaches a pleasant 25°C (78°F), offering a welcome warmth that, when coupled with the frequent showers, transforms the landscape into a lush paradise. For a deeper dive into the climate nuances of this enchanting locale, visit San Andres Climate.