Last updated: April 22, 2025
San Cristobal, Mexico, experiences a dynamic September marked by warm temperatures and significant rainfall. With maximums reaching 36°C (97°F) and an average of 28°C (82°F), the weather remains humid, averaging 87% humidity. This month witnesses approximately 358 mm (14.1 in) of precipitation over 27 days, making it one of the wettest periods of the year. Visitors should prepare for a blend of tropical warmth and frequent showers, showcasing the region's lush landscape in full bloom.
In September, San Cristobal experiences a comfortable climate, where temperatures typically hover between a pleasant 22°C (72°F) and a warm 36°C (97°F) during the day. With an average temperature of 28°C (82°F), this month marks a brief pause in the hotter months, maintaining the warmth familiar in late summer. The consistent temperature patterns from August—characterized by minimums of 22°C (73°F)—persist, indicating that early fall still embraces the lingering warmth of summer. As the days start to shorten, the gradual cooling trend hints at the approach of autumn, making September a delightful time to explore the vibrant landscapes of this picturesque Mexican town.
September in San Cristobal is characterized by significant rainfall, with an impressive 358 mm (14.1 in) recorded over the month. This substantial precipitation comes from 27 rainy days, continuing the trend of wet weather established in the previous months of August and July, which saw 369 mm (14.5 in) and 302 mm (11.9 in) respectively. The rainy season peaks during this time, resulting in lush landscapes and vibrant environments. As September transitions into October, the overall precipitation begins to decrease, with a notable drop to 295 mm (11.6 in), suggesting that while the tail end of the rainy season still delivers ample moisture, a gradual shift toward drier days is on the horizon.
In September, the humidity in San Cristobal, Mexico remains high at 87%, mirroring the peak levels typically experienced in August. This month marks a transition from the summer's sweltering embrace, with humidity gradually increasing since the drier months of April and May, which recorded significantly lower levels at 59% and 64%, respectively. The influx of moisture in the atmosphere is emblematic of the region’s tropical climate, where the humidity frequently hovers above 80% from July through October. As the year progresses into the fall, the humidity levels remain resiliently high, showcasing a climatic pattern that emphasizes San Cristobal's lush environment.
In September, San Cristobal experiences a UV Index of 13, categorizing the sun's rays as extreme, with a quick burn time of just 10 minutes. This places September firmly among the peak months for UV exposure, a trend that begins in early spring and continues through summer. While the index dips slightly in October, both months fall into the extreme category, emphasizing the importance of sun protection year-round. As you plan outdoor activities, be mindful of this high UV Index and take necessary precautions to safeguard your skin. For more detailed information, visit San Cristobal UV Index.
UV Risk Categories
September in San Cristobal, Mexico, marks the transition between the advent of autumn and the remnants of summer, boasting an impressive 251 hours of sunshine. This month shows a slight decline from the sun-drenched days of May, which peaks at 317 hours, but still holds its own compared to the earlier months of the year. As the summer sun gradually wanes, September's bright days are reminiscent of the vibrant energy of July and August, while maintaining a substantial glow that leads into the cooler autumn months. The trend reflects a rich tapestry of sunlight throughout the year, with September serving as a calm bridge, balancing the lush brightness of summer and the comforting embrace of fall.
As September rolls into San Cristobal, the likelihood of sunny weather dwindles significantly, with only a 14% chance of sun. This marks one of the lowest probabilities of the year, following the already rainy months of June and August. The trend shows that as summer transitions into fall, the region experiences a notable decrease in clear skies, dropping from the highs of around 58% in April and 63% in March. September's cloudy disposition hints at a shift towards wetter weather, making it a less favorable month for sun-seekers, who may want to plan their visits for the sunnier months of February, March, or even October, when the chance of sunshine increases again.
In San Cristobal, Mexico, the daylight duration reveals a captivating rhythm throughout the year. As the calendar turns to September, residents enjoy approximately 12 hours of daylight, maintaining the trend established in the summer months. Following a gradual increase peaking at 13 hours in June and July, daylight starts to recede, hinting at the approach of autumn. This steady consistency of 12 hours from March through September creates a vibrant atmosphere, perfect for exploring the rich cultural landscape and breathtaking surroundings. As the days shorten in October, the cycle continues, marking the transition to the cozy, more introspective months ahead.
In September, the air in San Cristobal takes on a character of its own, with an average wind speed of just 1.8 m/s (4 mph), making it one of the stillest months of the year. This gentle breeze contrasts sharply with the more invigorating winds of March and April, which see speeds reaching 3.2 m/s (7 mph). Interestingly, September's calmness continues a trend observed since the early summer months, where the winds gradually decreased from 2.6 m/s in May to this current low. As autumn approaches, the subtle shifts in wind emphasize the changing seasons, inviting a reflective pause against the vibrant backdrop of this charming Mexican town.
The weather in San Cristobal 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 Cristobal and find detailed weather information for every month.
In September, the weather is significantly warmer and more humid compared to January, with minimum temperatures around 22°C (72°F) and averages peaking at 28°C (82°F). This month also experiences heavy rainfall, totaling 358 mm (14.1 in) spread over 27 days, resulting in a high humidity level of 87%. In contrast, January presents milder conditions, featuring a minimum temperature of 13°C (55°F) and an average of 23°C (73°F), with a maximum reaching 34°C (94°F). The precipitation in January drops to 84 mm (3.3 in) over just 12 days, along with a slightly lower humidity of 83%. For more details, you can check San Cristobal weather in January.
September and February present contrasting weather patterns. In September, temperatures soar, with averages around 28°C (82°F) and peaks reaching up to 36°C (97°F), while the high humidity of 87% and nearly daily rainfall (358 mm over 27 days) create a muggy climate. In stark contrast, February offers a milder climate, where temperatures range from a minimum of 13°C (56°F) to a maximum of 34°C (94°F), accompanied by lower humidity at 76% and minimal rainfall of just 53 mm over 9 days. For more details on February's climate, you can visit San Cristobal weather in February.
When comparing the weather in September and March, significant differences emerge. September experiences much higher temperatures, with an average of 28°C (82°F) and maximums reaching up to 36°C (97°F), contrasted with March's milder average of 25°C (78°F) and maximums of 37°C (99°F). However, September is characterized by much heavier rainfall, accumulating 358 mm (14.1 in) over 27 days, while March sees only 31 mm (1.2 in) across just 8 days. Additionally, the humidity in September is notably higher at 87%, compared to March's 66%. For a more detailed look at the weather during this time, visit San Cristobal weather in March.
When comparing the weather between September and April, notable differences emerge in temperature and precipitation. In September, the temperatures range from a minimum of 22°C (72°F) to a maximum of 36°C (97°F), with an average of 28°C (82°F). This month is characterized by high humidity at 87% and significant rainfall, totaling 358 mm (14.1 in) over 27 days. In contrast, April features a lower minimum temperature of 18°C (64°F) and a higher maximum of 39°C (102°F), while maintaining the same average of 28°C (82°F). However, April experiences considerably less precipitation, with only 28 mm (1.1 in) over just 6 days and a much lower humidity level of 59%. For more details on the specifics of April weather, you can refer to San Cristobal weather in April.
September and May exhibit distinct weather patterns that reflect their positioning in the seasonal calendar. In September, temperatures typically range from a minimum of 22°C (72°F) to a maximum of 36°C (97°F), with an average of 28°C (82°F). This month is characterized by high humidity at 87% and significant precipitation, totaling 358 mm (14.1 in) over 27 days. In contrast, May boasts slightly lower minimum temperatures of 19°C (67°F) and higher maximums reaching 39°C (103°F), with an average of 29°C (85°F). The month sees much less rainfall, with only 83 mm (3.3 in) spread over 12 days and a humidity level of 64%. For more detailed information, you can check San Cristobal weather in May.
In comparing the weather between September and June, both months feature similar minimum temperatures of around 22°C (72°F) to 23°C (73°F) and average temperatures near 28°C (82°F to 83°F). However, June tends to be slightly hotter, with maximum temperatures reaching up to 38°C (100°F), compared to September's peak of 36°C (97°F).
When it comes to precipitation, September experiences significantly more rainfall, totaling 358 mm (14.1 in) over 27 days, whereas June has only 270 mm (10.6 in) across 24 days. Additionally, September is notably more humid, with levels around 87%, compared to June's 69%. For a detailed look at June's weather patterns, you can check San Cristobal weather in June.
In both September and July, the temperatures remain quite similar, with minimums of 22°C (72°F), average highs of 28°C (82°F), and maximums reaching up to 36°C (97°F). However, September experiences higher precipitation, totaling 358 mm (14.1 in) over 27 days, compared to July's 302 mm (11.9 in) across 28 days. Additionally, September is slightly more humid, with an average humidity of 87% versus July's 82%. For a detailed look at the conditions during July, you can visit San Cristobal weather in July.
In comparing the weather of September and August, we note that both months share similar temperature ranges, with minimum temperatures around 22°C (72°F), average temperatures at 28°C (82°F), and maximum temperatures peaking at 36°C (96-97°F). However, September experiences slightly less rainfall, with 358 mm (14.1 in) over 27 days, compared to August's 369 mm (14.5 in) over 28 days. Interestingly, both months maintain a high humidity level of 87%, providing a consistently muggy atmosphere. For more detailed insights on August weather, check out San Cristobal weather in August.
In comparing the weather between September and October, September features slightly higher temperatures, with average highs reaching 36°C (97°F) compared to October's 35°C (96°F). Both months experience high humidity, but October sees a marginal decrease in average temperatures, with a minimum of 20°C (68°F) versus September's 22°C (72°F). Precipitation levels are also lower in October, with 295 mm (11.6 in) recorded over 24 days, compared to September's 358 mm (14.1 in) over 27 days. For more detailed insights on weather patterns, you can visit San Cristobal weather in October.
In September, the weather is noticeably hotter and more humid, with average temperatures reaching 28°C (82°F) and maximums peaking at 36°C (97°F). This month also experiences significant rainfall, totaling 358 mm (14.1 inches) over 27 days, contributing to a high humidity level of 87%. In contrast, November brings cooler temperatures, with an average of 25°C (76°F) and a maximum of 34°C (93°F). Precipitation drops significantly to 151 mm (5.9 inches) over just 18 days, while humidity remains slightly higher at 88%. For more detailed information, you can check San Cristobal weather in November.
In September, temperatures in San Cristobal range from a warm minimum of 22°C (72°F) to a scorching maximum of 36°C (97°F), with an average temperature of 28°C (82°F). The month is characterized by high humidity at 87% and considerable precipitation, totaling 358 mm (14.1 in) over 27 days. In contrast, December sees milder conditions, with temperatures dropping to a minimum of 14°C (57°F) and peaking at 34°C (93°F), averaging 23°C (74°F). The amount of rainfall also decreases significantly to 81 mm (3.2 in) over just 16 days, while humidity remains high at 88%. For more detailed information, check out San Cristobal weather in December.
As September rolls into San Cristobal, the weather experiences noticeable shifts compared to the drier months that precede it. High humidity levels and frequent rain transform the lush landscape, creating a vibrant and flourishing environment. With average temperatures maintaining a warm and comfortable feel, the increased precipitation results in lush scenery that contrasts to the relatively parched summer. This unique combination of warmth and moisture defines September as a month of rejuvenation, offering a stark reminder of the region's tropical nature. For a deeper understanding of what to expect from the climate throughout the year, check out San Cristobal Climate.