Last updated: April 22, 2025
Discover the September weather in Guanajuato, Mexico, where the temperatures can soar to a sweltering 49°C (121°F), with an average daily peak of 32°C (90°F). Despite these high temperatures, the nights offer a refreshing contrast, dipping down to a pleasant minimum of 15°C (59°F). The month sees a modest 13 mm (0.5 in) of rain, occurring across just 2 days, contributing to a humidity level of 52% that enhances the warmth. Whether you're exploring the city's vibrant streets or relaxing in the colorful plazas, September in Guanajuato promises a unique blend of heat and cultural charm.
In Guanajuato, Mexico, September marks a transition as temperatures begin to soften from the intense summer heat. The month boasts a minimum temperature of 15°C (59°F), providing a comforting start to the day. As the sun rises higher, afternoons warm up to an average temperature of 32°C (90°F), making it ideal for outdoor exploration. With maximum temperatures peaking at 49°C (121°F), visitors can still expect the lingering warmth typical of summer. However, the noticeable dip in the morning temperatures hints at the arrival of autumn, creating a harmonious blend of summer and fall that invites both adventure and relaxation under the vibrant skies of Guanajuato.
In September, Guanajuato experiences a slight uptick in precipitation, with a total of 13 mm (0.5 in) recorded over two days of rain. This marks a continuation of the rainy season that typically begins in July, following a summer trend where the region sees modest but consistent rainfall, peaking in the late summer months. Notably, September’s precipitation is a slight decrease from August's 12 mm, yet it remains significant compared to the drier months earlier in the year, such as April and May, where rainfall was nearly negligible. As the month transitions into October, the overall precipitation begins to decline sharply, showcasing the cyclical nature of Guanajuato's climate.
In September, Guanajuato experiences a notable shift in humidity, rising to 52% after a summer of drier air, which has hovered around 42% in August. This uptick is part of a gradual trend where humidity levels begin to climb again in the fall, setting the stage for the wetter months ahead. Throughout the year, the region showcases a striking seasonal rhythm — beginning with a high of 72% in January, gradually dropping to its annual low of 42% in August, before trending upwards once more. As September rolls in, the transition from summer to autumn brings a refreshing change, hinting at the lushness of the season ahead while still maintaining relatively comfortable conditions for residents and visitors alike.
In September, Guanajuato experiences a UV Index of 10, categorized as very high, prompting a cautious approach to sun exposure with a burn time of just 15 minutes. This month follows a summer of extreme UV levels, peaking at 12 in July and 11 in both May and June, illustrating a consistent trend of intensified solar radiation during the hotter months. As the fall season approaches, there's a slight dip in UV intensity, yet the risk remains significant. Visitors and residents alike should take precautions, such as wearing protective clothing and applying sunscreen, to shield against the sun's harmful rays. For more details on sun safety, check out the full Guanajuato UV Index.
UV Risk Categories
As summer transitions to autumn, September in Guanajuato, Mexico, radiates with an impressive 322 hours of sunshine, providing a perfect backdrop for exploration and relaxation. This month reflects a subtle decline from the peak sunny months of May through July, but still holds onto a generous amount of bright days. With daylight gradually tapering off from the sweltering summer highs, September strikes a harmonious balance—one that invites visitors to enjoy the vibrant culture and stunning scenery while basking in the warm glow of the sun. This delightful array of sunshine sets the stage for a picturesque fall, making Guanajuato an irresistible destination for those seeking both adventure and tranquility.
As September approaches in Guanajuato, Mexico, residents and visitors can look forward to a notably bright month, with a sunny weather likelihood of 85%. This marks a slight increase from the previous month, August, which enjoys a robust 83% chance of sunshine. The trend for September indicates a continued pattern of plentiful sunshine following the peak sunny days of May at 93%. As the year transitions into the cooler autumn months, the chances of sunshine remain favorable, maintaining a strong presence through October with an 80% likelihood. This consistent sunlight throughout early fall adds to the charm of Guanajuato, making it an appealing destination for those seeking warm, sunlit days before the winter chill sets in.
In Guanajuato, Mexico, September marks a transition into shorter days, as the average daylight duration dips to 12 hours. Following the long, sun-soaked days of summer, which peak at 14 hours in June and July, early fall signals the gradual winding down of daylight. As summer gives way to autumn, the daylight slowly recedes, transitioning from the 13 hours seen in August. This progressive shift continues into October, dropping to 11 hours. The rhythm of daylight in Guanajuato not only reflects the changing seasons but also invites locals and visitors alike to relish the beautiful evenings as summer fades into the cozy embrace of autumn.
As September unfolds in Guanajuato, Mexico, the wind slows to a gentle breeze, averaging just 2.1 m/s (5 mph). This marks a slight decline from the preceding months, continuing a trend observed throughout the late summer. While the winds pick up slightly in July, they tend to soften as autumn approaches, reflecting a calming shift in the climate. The transition is subtle, yet it creates a serene atmosphere perfect for enjoying the city's vibrant culture, rich history, and stunning architecture. Thus, September becomes a time for leisurely strolls through the colorful streets, where the light wind whispers tales of Guanajuato's enchanting allure.
The weather in Guanajuato 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 Guanajuato and find detailed weather information for every month.
September and January present starkly contrasting weather conditions. In September, temperatures can soar from a minimum of 15°C (59°F) to a sweltering maximum of 49°C (121°F), with an average of 32°C (90°F). The month sees relatively low precipitation, averaging 13 mm (0.5 in) over just 2 days, alongside a humidity level of 52%. In contrast, January offers a much cooler climate, with temperatures ranging from a chilly 1°C (35°F) at night to a daytime high of 30°C (86°F), averaging around 15°C (60°F). Precipitation is slightly lower at 9 mm (0.3 in) over just 1 day, but the humidity rises significantly to 72%. For more detailed insights on January weather, you can check Guanajuato weather in January.
September and February present a striking contrast in weather conditions. In September, temperatures soar, with a minimum of 15°C (59°F) and an average high of 32°C (90°F), peaking at an extreme 49°C (121°F). This month experiences relatively low precipitation at 13 mm (0.5 inches) over just two days, with humidity at a moderate 52%. In contrast, February offers much cooler temperatures, ranging from a minimum of 2°C (35°F) to an average of 17°C (62°F), with a maximum of 31°C (89°F). While precipitation is slightly lower at 12 mm (0.5 inches) over the same two days, humidity is significantly higher at 77%, giving February a much more damp and chilly feel. For a detailed look at February weather, you can visit Guanajuato weather in February.
September and March present contrasting weather patterns. In September, temperatures can soar to a maximum of 49°C (121°F) with an average of 32°C (90°F), while the minimal temperature sits at a more comfortable 15°C (59°F). The month experiences only 13 mm (0.5 in) of precipitation over about two days, coupled with a humidity level of 52%.
In contrast, March offers cooler conditions, with a maximum temperature of 37°C (99°F) and an average temperature of 20°C (68°F), while the minimum temperature drops to 5°C (41°F). This month sees slightly less precipitation at 11 mm (0.4 in), occurring over just one day, but the humidity is higher at 67%.
For more detailed weather information, you can explore Guanajuato weather in March.
When comparing the weather in September and April, it’s clear that September is significantly warmer, with average temperatures reaching up to 32°C (90°F) and maximums soaring as high as 49°C (121°F). In contrast, April has a milder average temperature of 25°C (77°F) and a maximum of 43°C (110°F). Precipitation is minimal in both months, but April experiences no rainy days compared to the two days of light rainfall in September. Additionally, humidity levels are quite similar, with April at 56% and September at 52%. For more detailed information, you can check out the Guanajuato weather in April.
In comparing the weather of September and May, September tends to be hotter with an average temperature of 32°C (90°F) and a maximum of 49°C (121°F), whereas May has a slightly cooler average of 28°C (82°F) and a maximum of 44°C (111°F). Both months experience low precipitation, but September sees more rain with 13 mm (0.5 in) over 2 days, compared to May, which records just 3 mm (0.1 in) without any rainy days. The humidity in September is also higher at 52%, while May enjoys a drier atmosphere with 46% humidity. For more detailed insights on May weather, you can check out Guanajuato weather in May.
In comparing September and June weather, both months experience similar extreme temperatures, with maximums reaching up to 49°C (121°F). However, June tends to be slightly warmer on average, with temperatures peaking at 33°C (91°F) and a minimum of 18°C (64°F), as opposed to September's average of 32°C (90°F) and minimum of 15°C (59°F). Precipitation is minimal in both months, but June boasts completely dry conditions with only 1 mm of rain and no rainy days, contrasting with September's 13 mm of precipitation over 2 days. Humidity levels are also slightly higher in September at 52%, compared to June's 48%. For more details, you can check Guanajuato weather in June.
In comparing the weather of September to that of July, we see notable differences in temperature and humidity. September has a minimum temperature of 15°C (59°F) and an average of 32°C (90°F), while July's temperatures start higher, with a minimum of 22°C (72°F) and an average of 36°C (97°F). Both months experience similar precipitation levels, with July receiving 14 mm (0.5 in) over three days and September seeing slightly less at 13 mm (0.5 in) over two days. Humidity is also lower in July at 46%, compared to September's 52%, suggesting a slightly more comfortable feel in the earlier summer month. For a detailed look at July weather in Guanajuato, visit Guanajuato weather in July.
In September, the weather shows a slight cooling trend compared to August, with minimum temperatures dropping to 15°C (59°F) and an average of 32°C (90°F). In contrast, August experiences higher minimum temperatures of 24°C (76°F) and an average of 36°C (97°F). Although both months share similar precipitation levels, September records rain on just 2 days, while August sees rain over 4 days, with humidity slightly higher in August at 42% compared to 52% in September. For a closer look at August weather specifics, check out Guanajuato weather in August.
September and October weather show a notable transition as summer fades into fall. September features higher temperatures, with a minimum of 15°C (59°F) and an average soaring to 32°C (90°F), peaking at a sweltering 49°C (121°F). In contrast, October cools down significantly, presenting a minimum of 7°C (46°F) and an average of 26°C (79°F) while maxing out at 43°C (110°F). Precipitation decreases considerably from 13 mm (0.5 in) over 2 days in September to just 5 mm (0.2 in) with no rain in October. Humidity also rises slightly from 52% in September to 58% in October, adding to the crispness of the autumn air. For a detailed look at October weather, check out Guanajuato weather in October.
September and November exhibit strikingly different weather patterns. In September, temperatures can soar with a minimum of 15°C (59°F) and an average high of 32°C (90°F), reaching extremes of up to 49°C (121°F). This month also experiences limited precipitation, averaging 13 mm (0.5 in) over just 2 days, while maintaining a humidity level of 52%. In contrast, November offers a much cooler climate, with temperatures dropping to a minimum of 7°C (44°F) and an average of 20°C (68°F), peaking at 35°C (96°F). Rainfall is minimal in November, with only 4 mm (0.1 in) and no recorded rainy days, accompanied by higher humidity at 66%. For more details on the weather in November, you can check Guanajuato weather in November.
In September, the weather tends to be hot with temperatures ranging from a minimum of 15°C (59°F) to a scorching maximum of 49°C (121°F), averaging around 32°C (90°F). The humidity level is moderate at 52%, accompanied by a small amount of rainfall totaling 13 mm (0.5 in) over two days. In contrast, December brings much cooler temperatures, with a minimum of 3°C (38°F) and a maximum of 29°C (84°F), averaging 14°C (58°F). The month has lower precipitation at 7 mm (0.3 in) over just one day, but significantly higher humidity at 74%. For more details, check out Guanajuato weather in December.
In September, Guanajuato experiences a notable shift as the sweltering heat of summer begins to wane, making way for more comfortable average temperatures. The days are warm, often reaching the high 30s°C, but a slight dip towards cooler evenings introduces refreshing air, offering a welcome relief from the summer highs. With minimal precipitation and humidity levels hovering around 52%, the month tends to be drier, allowing for plenty of sunshine while still retaining a hint of tropical flair. This transitional period makes September an ideal time to explore the vibrant culture and stunning scenery of Guanajuato. For a detailed overview of weather patterns throughout the year, visit Guanajuato Climate.