Last updated: April 22, 2025
In Monterrey, Mexico, September showcases a warm climate with maximum temperatures reaching up to 32°C (90°F) and an average of 25°C (76°F), creating an inviting atmosphere suitable for outdoor activities. However, the month is characterized by significant precipitation—totaling 302 mm (11.9 in) over approximately 28 days, resulting in a high humidity level of around 80%. This combination of warmth and frequent rains contributes to a lush and vibrant environment, making September a unique experience for both locals and visitors.
In September, Monterrey experiences a delightful transition as summer begins to fade. With minimum temperatures averaging around 19°C (67°F) and daytime highs reaching up to 32°C (90°F), the weather remains pleasantly warm but slightly milder than the peak summer months. The average temperature hovers around 25°C (76°F), providing comfortable conditions for outdoor activities. As the month progresses, you may notice a gradual dip from the high summer heat, making September an ideal time to explore this vibrant city without the sweltering intensity of previous months. This combination of warmth and decreasing temperatures offers a perfect climate for both tourists and locals alike.
September marks a significant peak in precipitation for Monterrey, Mexico, with a remarkable 302 mm (11.9 in) of rainfall recorded over 28 days. This surge is part of a broader trend characterized by an escalating rainy season from May through September, culminating in the highest rainfall of the year. The transition from August's 266 mm (10.5 in) to September's amounts underscores the intensity of the monsoon season, which not only enriches the soil and replenishes reservoirs but also shapes the region's climate dynamics. Following September, the rainfall begins to taper off, with October still experiencing notable precipitation at 231 mm (9.1 in) but less frequent rain days. As such, September stands out as a pivotal month, representing both the zenith of the rainy season and a critical time for agricultural and water resource management in the region.
In September, Monterrey, Mexico experiences a significant transition in humidity, registering at 80%. This value reflects a slight decline from the peak levels observed in August at 82%, marking the end of the summer months where humidity tends to reach its highest. The overall trend throughout the year shows a gradual rise in humidity from the drier winter months, peaking in mid-summer. As September approaches, the atmosphere begins to cool slightly, allowing for a more comfortable yet still humid environment, as it prepares to reclaim lower levels seen earlier in the season.
In September, Monterrey, Mexico experiences a UV Index of 13, maintaining its status in the extreme exposure category, with a burn time of just 10 minutes. This trend continues from the preceding months, where the UV Index remained consistently high, peaking at 15 in July and generally fluctuating between 13 and 14 throughout the summer. Despite a slight decrease from August’s Index of 14, the sunlight remains unforgiving, reminding residents and visitors alike of the importance of sun protection. As autumn approaches, it's crucial to stay vigilant about UV exposure. For those looking to understand more about UV levels in the area, further information can be found at Monterrey UV Index.
UV Risk Categories
September in Monterrey, Mexico, brings an inviting 285 hours of sunshine, continuing the region's trend of abundant daylight as summer transitions into autumn. Following the vibrant warmth of August, which recorded 300 hours of sunshine, September’s sun-soaked days offer a delightful mix of warmth and cooler breezes. Notably, the month maintains a strong performance within a generally sun-rich season that peaks in intensity with July’s impressive 317 hours. This consistency suggests that as the year progresses, Monterrey enjoys a reliable array of sunlit moments, perfect for outdoor activities and exploration. With October's slight dip to 287 hours, September serves as a beautiful reminder of the lingering summer vibes before the gradual shift into the cooler months ahead.
In Monterrey, Mexico, September tends to be one of the cloudier months, with a relatively low 17% chance of sunny weather. This marks a noticeable decline as summer transitions into fall, following the peak months of February and March, which boast sunny probabilities of 85% and 77%, respectively. Interestingly, the likelihood of sun significantly drops during the summer months of June, July, and August, reaching a low of 12% in June. As September rolls in, residents and visitors can expect mostly overcast skies, making it less favorable for those hoping to bask in the sun. However, the transition into October brings a moderate increase in sunny days, hinting at the gradual return of clearer skies as the year progresses.
As September arrives in Monterrey, Mexico, the city enjoys a constant daylight duration of 12 hours, mirroring the preceding months of June, July, and August. This month marks a seamless transition into the more subdued hours of autumn, as daylight gradually begins to recede after reaching its peak in early summer. Notably, the daylight hours remain stable throughout September, reflecting a pattern of consistency in the length of days that captivates locals and visitors alike. This equilibrium in daylight prepares the city for the shorter days of October, while still inviting plenty of opportunities for outdoor activities under the vibrant sun.
As summer gives way to autumn in Monterrey, September brings a gentle shift in the wind, marking a notable transition from the sweltering heat of previous months. With an average wind speed of 1.2 m/s (3 mph), the breezes begin to pick up slightly from August's calm. This subtle increase reflects a broader trend observed as the year progresses; while winter months like November and December feature brisker winds, September's relatively mild gusts offer a refreshing escape from the peak summer stillness. The delicate balance of warm days and cooling winds makes this month a perfect time for outdoor activities, inviting residents and visitors alike to savor the pleasant embrace of nature.
The weather in Monterrey 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 Monterrey and find detailed weather information for every month.
In comparing the weather of September and January, it's clear that September experiences a warmer and more humid climate, with average temperatures ranging from a minimum of 19°C to a maximum of 32°C. This month also sees significant rainfall, totaling 302 mm over 28 days, leading to a humidity level of around 80%. In contrast, January offers a cooler atmosphere with temperatures ranging from a minimum of 12°C to a maximum of 33°C but with much less precipitation—only 4 mm and no rainy days. The humidity is also lower at 70%, contributing to a more comfortable, dry climate. For those interested in more details, you can explore Monterrey weather in January.
September and February in Monterrey showcase distinct weather patterns that highlight the transition from late summer to early spring. In September, temperatures range from a minimum of 19°C (67°F) to a maximum of 32°C (90°F), with an average of 25°C (76°F). This month is characterized by significant rainfall, with 302 mm (11.9 in) of precipitation occurring over 28 days, resulting in high humidity levels of around 80%. In contrast, February experiences milder conditions, with temperatures varying from a minimum of 12°C (54°F) to a maximum of 35°C (95°F), averaging 24°C (75°F). Notably, February features minimal precipitation, with only 2 mm (0.1 in) recorded over the month, leading to lower humidity at 68%. For more detailed insights, visit Monterrey weather in February.
When comparing the weather in September to March, notable differences emerge. September features warmer temperatures with a minimum of 19°C (67°F) and a maximum of 32°C (90°F), while March enjoys slightly cooler mornings with a minimum of 15°C (60°F) and hot afternoons peaking at 35°C (96°F). However, September is less favorable in terms of dryness, experiencing significant precipitation of 302 mm (11.9 in) over 28 days and high humidity levels at 80%. In stark contrast, March boasts a much drier climate, receiving only 6 mm (0.2 in) of rain in just one day and lower humidity at 64%. For more details on weather trends, explore Monterrey weather in March.
September and April present notably different weather patterns. In September, temperatures range from a minimum of 19°C (67°F) to a sweltering maximum of 32°C (90°F), accompanied by high humidity levels at 80% and significant rainfall of 302 mm (11.9 in) spread over 28 days. In contrast, April offers a slightly lower minimum temperature of 16°C (61°F) and a higher maximum of 36°C (97°F), but with much less precipitation, totaling only 36 mm (1.4 in) over just 6 days and lower humidity at 67%. This makes April generally warmer and drier, while September is characterized by more rain and humidity. For more detailed information, you can visit Monterrey weather in April.
In comparing the weather between September and May, we see notable differences in temperature, precipitation, and humidity. September experiences a warmer average temperature of 25°C (76°F) with a maximum of 32°C (90°F), while May boasts a higher maximum temperature of 35°C (96°F), although it has a slightly lower average of 26°C (79°F). Precipitation is considerably heavier in September, with 302 mm (11.9 in) spread across 28 rainy days, compared to May's 143 mm (5.6 in) over 25 days, making September a much wetter month. Additionally, September has higher humidity at 80%, compared to May’s 74%, contributing to a more oppressive feeling in the air during that time. For more details, you can check Monterrey weather in May.
September and June exhibit similar temperature ranges, with both months featuring a minimum of 19°C (67°F) and an average of around 25°C (76°F). However, June tends to have slightly higher maximum temperatures, reaching up to 33°C (92°F) compared to September's 32°C (90°F). In terms of precipitation, September is notably wetter, receiving 302 mm (11.9 in) over 28 days, while June records 281 mm (11.1 in) across 27 days. Additionally, September experiences a higher humidity level at 80%, compared to June's 78%. For a comprehensive look at weather conditions, you can check Monterrey weather in June.
In comparing the weather between September and July, we observe that both months experience similar average temperatures, with September averaging around 25°C (76°F) and July slightly warmer at 25°C (78°F). However, July tends to have higher maximum temperatures, reaching up to 34°C (93°F), compared to September's maximum of 32°C (90°F). Precipitation also varies significantly, with September receiving 302 mm (11.9 in) across 28 days, making it notably wetter than July, which sees only 178 mm (7.0 in) of rain over 26 days. Humidity levels are quite similar, remaining high in both months at around 80% for September and 81% for July. For more detailed insights, you can visit Monterrey weather in July.
In comparing the weather between August and September, both months feature similar minimum temperatures of 19°C (67°F) and average temperatures around 25°C (76°F). However, September tends to be slightly cooler at its maximum, reaching 32°C (90°F), whereas August peaks at a warmer 34°C (93°F). Precipitation levels are higher in September, with 302 mm (11.9 in) falling over 28 days compared to August's 266 mm (10.5 in) over 26 days. Additionally, humidity remains relatively high in both months, with September at 80% and August at 82%. For more detailed insights, you can check Monterrey weather in August.
September and October present a gradual transition in weather characteristics. In September, the average temperature settles around 25°C (76°F), with a minimum of 19°C (67°F) and a maximum reaching 32°C (90°F). This month experiences high precipitation levels of 302 mm (11.9 in) over 28 days, and humidity hovers around 80%, contributing to a more tropical feel.
In contrast, October slightly lowers the average temperature to 24°C (76°F), with a minimum of 17°C (63°F) and a peak at 33°C (91°F). Precipitation diminishes to 231 mm (9.1 in) over 23 days, while humidity increases marginally to 81%. For a more detailed look at what October has in store, check out Monterrey weather in October.
In September, the weather tends to be warmer and more humid, with temperatures ranging from a minimum of 19°C (67°F) to a maximum of 32°C (90°F) and an average of 25°C (76°F). This month also experiences significant rainfall, averaging 302 mm (11.9 in) over 28 days, contributing to the overall high humidity of 80%.
In contrast, November sees a slight drop in temperatures, with a minimum of 14°C (58°F), an average of 24°C (75°F), and a peak of 33°C (92°F). Rainfall during this month decreases dramatically to just 24 mm (0.9 in) over 5 days, while humidity remains steady at 80%. For more detailed information, you can refer to Monterrey weather in November.
September and December in Monterrey showcase contrasting weather patterns. In September, temperatures range from a minimum of 19°C (67°F) to a maximum of 32°C (90°F), accompanied by significantly high humidity levels of 80%. This month also experiences considerable rainfall, with an average precipitation of 302 mm (11.9 in) over 28 days, creating a rather wet and humid atmosphere.
In contrast, December presents a milder climate, with minimum temperatures dropping to 13°C (55°F) and average highs reaching 33°C (92°F). Notably, precipitation is much lower, with only 6 mm (0.2 in) recorded on just one day, keeping the month predominantly dry and more comfortable, evidenced by a decrease in humidity to 75%. For more details about December weather, refer to Monterrey weather in December.
As September unfolds in Monterrey, the city experiences a distinct shift in its weather patterns, characterized by higher humidity and a notable increase in rainfall compared to other months. With frequent precipitation, the vibrant landscapes come alive, while temperatures remain comfortably warm, offering a pleasant contrast to the often arid heat of summer. This blend of warmth and moisture sets September apart, making it an enchanting time to experience the lush beauty of Monterrey's surroundings. For a deeper understanding of what to expect throughout the year, check out Monterrey Climate.