September Weather in San Carlos, Mexico

Last updated: April 22, 2025

Experience the vibrant September weather of San Carlos, Mexico, where temperatures soar to a maximum of 41°C (106°F) while maintaining an inviting average of 28°C (83°F). As the warmth envelops the region, the nights offer a refreshing drop to a minimum of 13°C (56°F). This month brings an average precipitation of 125 mm (4.9 in) over approximately 8 days, contributing to a tropical ambiance with humidity levels hovering around 68%. Whether soaking up the sun or enjoying the gentle rain, September in San Carlos promises a dynamic and delightful climate for all.

September Temperature in San Carlos

In September, San Carlos, Mexico, begins to transition from the intense summer heat as temperatures start to cool slightly. With minimums dipping to a comfortable 13°C (56°F) and average highs reaching up to 41°C (106°F), the month offers a delightful balance between warmth and refreshing breezes. Notably, the average temperature of 28°C (83°F) signals a shift from the scorching highs of the preceding months while still retaining enough heat for sun seekers. This pattern of moderated heat makes September an attractive time for visitors looking to enjoy the beauty of San Carlos without the extreme summer temperatures.

September Weather in San Carlos: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Carlos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec545867748186888882736357
Data source: Temperature data for San Carlos generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in San Carlos

In September, San Carlos experiences a significant leap in precipitation, receiving a hefty 125 mm (4.9 in) of rain over 8 days. This surge marks the month as the wettest of the year, contrasting sharply with the lighter rainfall seen in the preceding months. From an average of around 20 to 80 mm from January to August, September's rainfall reflects the onset of the rainy season, bringing much-needed moisture to the region. Following the breezy summer months, the increase not only rejuvenates the landscape but also signals the transition into the milder fall ahead, culminating in a vibrant, lush environment that thrives from this seasonal downpour.

September Precipitation Trends in San Carlos

The chart displays monthly precipitation patterns in San Carlos, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2025253679453827125601321
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Carlos

In September, San Carlos experiences a noticeable increase in humidity, leveling out at 68%. This marks a shift from the drier months of July and August, which see humidity dip to 65% and 55%, respectively. Following the summer, September signals a return to more comfortable conditions as seasonal changes begin to unfold, preparing the region for the wetter months ahead. This trend continues into October, where humidity rises again to 77%, while winter months gradually escalate to more humid levels, peaking at 87% by December. Overall, September serves as a vital transitional month that bridges the dry summer to the more humid fall, offering a refreshing change in the climate.

September Average Humidity in San Carlos

This chart illustrates the average monthly humidity levels in San Carlos, 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.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%70%73%79%78%65%55%68%77%84%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Carlos

In September, San Carlos, Mexico, experiences a UV Index of 11, placing it in the extreme exposure category with a burn time of just 10 minutes. As summer fades, the UV Index begins to decline slightly from the peak levels seen in the preceding months; however, the need for sun protection remains critical. This month’s index, although lower than August's consistent 12, still indicates substantial intensity that warrants caution for outdoor activities. Visitors and residents alike should be mindful of sun safety as they enjoy the warm weather, ensuring they apply sunscreen regularly and seek shade when necessary. For more details on UV levels throughout the year, check out the full information here: San Carlos UV Index.

Maximum UV Index Levels in San Carlos for September

The chart shows the monthly maximum UV Index (UVI) for San Carlos 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.
JanFebMarAprMayJunJulAugSepOctNovDec5810111212121211965
Data source: San Carlos 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 San Carlos

As the summer heat begins to wane in San Carlos, September offers a delightful transition with 291 hours of sunshine. This month retains the warmth of summer while gradually ushering in a change, reflecting a typical pattern seen from the peak of July with its impressive 360 hours of sunlight. Following an energetic August that boasts 344 hours, September gently descends into the milder days of autumn, yet still shines brightly compared to the cooler months ahead. With sunshine hours tapering off in October at 268 hours, this month serves as a beautiful reminder of the vibrant energy that summer brings, bridging the gap to the serene ambiance of fall.

Monthly Sunshine Duration in San Carlos: September Highlighted

The September sunshine duration represents the total number of hours San Carlos 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.
JanFebMarAprMayJunJulAugSepOctNovDec197h230h273h290h320h342h360h344h291h268h249h248h
Data source: San Carlos September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Carlos During September

September boasts a notable 75% chance of sunny weather in San Carlos, Mexico, making it one of the sunniest months of the year. This uptick in sunshine contrasts with the preceding summer months, where the likelihood hovers between 50% and 60%. After a summer of mixed weather, September welcomes a refreshing shift, heralding the onset of clearer skies and more radiant days. As the temperature begins to cool slightly moving into fall, outdoor enthusiasts can revel in the beautiful weather, making it an ideal time for beach activities and exploration. With such a high chance of sun, September is undoubtedly a fantastic time to visit San Carlos and soak up the vibrant hues of the coastal landscape.

Percentage of Sunny Days in September in San Carlos

The chart illustrates the percentage of sunny days in San Carlos 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 San Carlos experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec70%60%62%49%49%60%53%50%75%64%53%52%
Data source: San Carlos September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Carlos in September

In San Carlos, Mexico, the daylight duration showcases an intriguing seasonal rhythm throughout the year. Starting at 10 hours in January, daylight gradually increases to a peak of 13 hours from May to August, providing ample time for outdoor activities and exploration. As summer transitions into fall, September witnesses a slight decrease, returning to 12 hours of daylight. This moderate decline continues into October, bringing shorter days as the year progresses again towards winter with 11 hours in October and ultimately settling back to 10 hours in November and December. Overall, the pattern highlights a vibrant summer abundance of sunlight, before gently easing into the shorter days of winter.

Average Daylight Hours in San Carlos for September

The chart illustrates the variation in daylight duration in San Carlos throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 30m11h 9m12h12h 52m13h 36m13h 57m13h 45m13h 7m12h 17m11h 25m10h 40m10h 18m
Data source: San Carlos daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in San Carlos

As September rolls in, the winds in San Carlos, Mexico, start to calm down slightly, with an average speed of 3.4 m/s (8 mph). This marks a gentle retreat from the breezier summer months, where April and May showcased steadier gusts of 4.8 m/s (11 mph). Following a summer peak, the wind speed gradually declines, echoing the shift from the vibrant warmth of summer toward the more temperate autumn days. While September's breeze is delicate, a soft reminder of the season change, it still retains a refreshing allure, especially for those looking to embrace the tranquil atmosphere of this beautiful coastal locale.

Average September Wind Speed in San Carlos

The chart displays monthly wind speed patterns in San Carlos, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.53.64.74.84.84.33.74.03.4 m/s3.73.73.0
Data source: San Carlos September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in San Carlos Compares to Other Months

The weather in San Carlos 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 Carlos and find detailed weather information for every month.

Comparing the weather in September and January reveals striking differences in temperature and overall climate conditions. September boasts warm temperatures with a minimum of 13°C (56°F) and an average high reaching up to 41°C (106°F), often accompanied by considerable rainfall totaling 125 mm (4.9 in) over about 8 days. In contrast, January experiences much cooler weather, with temperatures ranging from a minimum of -5°C (22°F) to a maximum of 33°C (91°F). The precipitation is significantly lower in January, averaging only 20 mm (0.8 in) over 3 days, and the humidity level is slightly higher at 76%. For a more detailed look at January weather, you can visit San Carlos weather in January.

September and February present starkly contrasting weather conditions. In September, temperatures range from a minimum of 13°C (56°F) to a sweltering maximum of 41°C (106°F), with an average temperature of 28°C (83°F). This month also experiences significant rainfall, with 125 mm (4.9 in) of precipitation over 8 days and a humidity level of 68%. In contrast, February features much cooler temperatures, with a minimum of -11°C (13°F) and a maximum of 35°C (95°F), averaging just 14°C (58°F). Precipitation in February is considerably lower, at 25 mm (1.0 in) over 5 days, and humidity rises to 75%. For a more detailed look at February weather in San Carlos, you can visit San Carlos weather in February.

September and March present strikingly different weather patterns. In September, temperatures soar with a minimum of 13°C (56°F) and can peak at a sweltering 41°C (106°F), while the average temperature hovers around 28°C (83°F). This month also experiences significant rainfall, with 125 mm (4.9 in) falling over about 8 days, and humidity levels remain relatively high at 68%. In contrast, March begins with cooler temperatures, starting at a minimum of 0°C (32°F) and reaching a maximum of 34°C (94°F), with an average temperature of 20°C (68°F). Rainfall is minimal in March, totaling only 25 mm (1.0 in) across 4 days, and humidity is slightly higher at 70%. For more detailed information on March weather, visit San Carlos weather in March.

September typically experiences warmer temperatures compared to April, with averages soaring to around 28°C (83°F) and the potential for maximums hitting 41°C (106°F). In contrast, April enjoys a milder average of 23°C (74°F), but it can still reach the same peak temperature of 41°C (106°F). Precipitation is notably higher in September, with 125 mm (4.9 in) spread over 8 days, while April sees only 36 mm (1.4 in) across 4 days, leading to a drier climate as spring unfolds. Humidity levels are slightly higher in April at 73%, compared to 68% in September. For a more detailed analysis, you can explore San Carlos weather in April.

When comparing the weather in September and May, both months share similar maximum temperatures, peaking at 41°C (106°F). However, September tends to be warmer on average, with temperatures reaching up to 28°C (83°F), while May has a slightly lower average of 27°C (81°F). Precipitation levels also differ, with September receiving 125 mm (4.9 in) over 8 days, compared to May's 79 mm (3.1 in) across 11 days, indicating that September is wetter despite having fewer rainy days. Humidity levels are higher in May at 79%, compared to September's 68%, which contributes to a more muggy feeling during that month. For a closer look at May's weather specifics, visit San Carlos weather in May.

In comparing the weather between September and June, we find notable differences in temperature and precipitation. September features a minimum temperature of 13°C (56°F) and an average high of 28°C (83°F), while June boasts warmer temperatures with a minimum of 19°C (67°F) and an average high of 30°C (86°F). Moreover, June's maximum temperature reaches 42°C (108°F), closely mirroring September's peak of 41°C (106°F). In terms of precipitation, September is significantly wetter with 125 mm (4.9 in) over 8 days compared to June's relatively dry 45 mm (1.8 in) across 6 days. Additionally, humidity levels are higher in June at 78%, compared to September's 68%. For more detailed information about the weather in June, you can visit San Carlos weather in June.

In comparing the weather between September and July, one can observe distinct differences. September experiences slightly cooler temperatures, with a minimum of 13°C (56°F) and an average of 28°C (83°F), while July is warmer, showcasing a minimum of 19°C (67°F) and an average of 31°C (88°F). July also reaches higher maximum temperatures, peaking at 43°C (110°F), compared to September's high of 41°C (106°F). Furthermore, September is noticeably wetter, with 125 mm (4.9 in) of precipitation over 8 days, compared to July's 38 mm (1.5 in) over just 5 days. Humidity levels are slightly higher in September at 68%, compared to July's 65%. For more detailed insights into July's weather, check out San Carlos weather in July.

In comparing the weather of September and August, September tends to be slightly cooler, with a minimum temperature of 13°C (56°F) and an average of 28°C (83°F), compared to August's higher minimum of 19°C (67°F) and average of 31°C (88°F). Both months can reach a maximum of 41°C (106°F), but September experiences significantly more rainfall, accumulating 125 mm (4.9 in) over 8 rainy days, while August only sees 27 mm (1.0 in) over 3 days. Additionally, September's humidity is notably higher at 68% compared to August’s 55%, contributing to a different overall feel for the month. For more detailed insights, you can check out San Carlos weather in August.

In September, temperatures are notably higher, with an average of 28°C (83°F) and peaks reaching up to 41°C (106°F), creating a sweltering climate. This month also sees substantial rainfall, accumulating 125 mm (4.9 in) over about 8 days, alongside a humidity level of 68%. In contrast, October experiences a significant drop in temperatures, with an average of 23°C (73°F) and maximums hitting 38°C (101°F). Precipitation decreases to 60 mm (2.4 in) across 7 days, but humidity rises slightly to 77%. For more specific details about October weather, you can refer to San Carlos weather in October.

September and November present striking contrasts in weather. In September, temperatures can soar with highs reaching up to 41°C (106°F) and an average of 28°C (83°F), complemented by an average humidity of 68% and significant rainfall at 125 mm (4.9 inches) over about 8 days. In stark contrast, November experiences much cooler temperatures, with minimums dipping to as low as -2°C (29°F) and an average of 17°C (63°F). Precipitation is minimal during this month, totaling only 13 mm (0.5 inches) across 2 days, while humidity rises to a higher 84%. For a more detailed overview, check out San Carlos weather in November.

September and December present stark contrasts in weather. In September, temperatures soar with a minimum of 13°C (56°F) and can reach highs of 41°C (106°F), making the month feel quite hot, with an average of 28°C (83°F). This month also sees significant rainfall, with 125 mm (4.9 in) over about 8 days and humidity levels hovering around 68%.

In contrast, December brings cooler temperatures, with a minimum of -2°C (28°F) and a maximum of 32°C (90°F), averaging 14°C (57°F). Rainfall is considerably less in December, totaling only 21 mm (0.8 in) across 2 days, while humidity rises to 87%. For a more detailed look at climate specifics, you can check this link: San Carlos weather in December.

Compare San Carlos's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in San Carlos

September in San Carlos presents a unique climate experience, distinguished by its significant humidity levels and relatively high precipitation. As summer transitions to fall, temperatures can soar, peaking at 41°C, yet the average remains comfortable at 28°C. Unlike the drier preceding months, September welcomes rain with around eight wet days, contributing to the lush scenery and vibrant atmosphere of the region. This blend of warmth and moisture creates a distinctive weather pattern that sets September apart from the typically drier summer months. For more detailed insights on the nuances of weather patterns throughout the year, be sure to check out San Carlos Climate.