September Weather in Mazatlan, Mexico

Last updated: April 22, 2025

September in Mazatlán, Mexico, offers a tropical experience characterized by warm temperatures and high humidity. With a maximum temperature of 29°C (84°F) and an average of 20°C (68°F), visitors can expect balmy days. However, nighttime brings cooler relief, with a minimum of 15°C (59°F). This month is also marked by significant rainfall, accumulating to 412 mm (16.2 in) across 28 days, making it one of the wettest times of the year. The 82% humidity adds to the tropical atmosphere, emphasizing the lush surroundings and vibrant coastal life that Mazatlán is known for. Prepare for both sunshine and showers as you explore this beautiful destination!

September Temperature in Mazatlan

In Mazatlán, Mexico, September offers a delightful taste of late summer, with temperatures showcasing a harmonious balance between warmth and comfort. The average temperature hovers around 20°C (68°F), with daytime highs reaching 29°C (84°F) and nighttime lows settling at 15°C (59°F). This month marks a smooth transition as the extreme heat of July and August begins to taper off, making September an ideal time for visitors to enjoy the city's stunning beaches without the sweltering humidity. As summer fades, the mild and inviting climate invites outdoor adventures and leisurely strolls along the serene coastal promenade, where the beauty of the Pacific coastline can be savored in pleasant temperatures.

September Weather in Mazatlan: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Mazatlan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec656769717168696868686765
Data source: Temperature data for Mazatlan generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Mazatlan

In Mazatlán, September marks the pinnacle of the rainy season, with 412 mm (16.2 in) of precipitation falling across 28 days. This trend showcases the region's significant shift from the drier months of early the year, where January receives just 10 mm over a single rainy day. As summer approaches its end, the torrential downpours intensify, peaking in August with 517 mm before transitioning slightly downward in September. This pattern reflects a consistently moist environment, fostering lush landscapes and vibrant ecosystems, while also encouraging outdoor adventures amid the refreshing rain. As the month closes, October's precipitation begins to taper off, hinting at the dry warmth that awaits in the final months of the year.

September Precipitation Trends in Mazatlan

The chart displays monthly precipitation patterns in Mazatlan, 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.
JanFebMarAprMayJunJulAugSepOctNovDec10513351553673575174122565615
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mazatlan

In Mazatlán, Mexico, September marks a peak in humidity, matching the sultry conditions of August with a notable 82%. Following the trend from earlier months, where humidity levels steadily rose from 59% in March to May’s 73%, the air becomes increasingly thick and steamy as summer transitions into fall. This high humidity level doesn’t just characterize the month but also reflects the region's tropical climate, setting the stage for vibrant sunsets and refreshing sea breezes. As temperatures start to cool slightly in October, humidity levels will begin to decline, providing a welcome relief after the sultry summer months.

September Average Humidity in Mazatlan

This chart illustrates the average monthly humidity levels in Mazatlan, 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.
JanFebMarAprMayJunJulAugSepOctNovDec65%61%59%62%73%78%79%82%82%79%72%70%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mazatlan

As summer gives way to autumn, September in Mazatlan, Mexico continues to showcase a consistently high UV Index of 14, categorizing it as extreme. Beachgoers and outdoor enthusiasts should remain vigilant, as the burn time is a mere 10 minutes under the strong sun. This trend of high UV levels persists from June through September, reflecting the region's intensity during the warmer months. With the UV Index gradually decreasing in October, those enjoying Mazatlan's beautiful beaches should take necessary precautions to protect their skin while soaking up the sun. For more detailed information on UV exposure, check out Mazatlan UV Index.

Maximum UV Index Levels in Mazatlan for September

The chart shows the monthly maximum UV Index (UVI) for Mazatlan 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.
JanFebMarAprMayJunJulAugSepOctNovDec10121414141414141412109
Data source: Mazatlan 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 Mazatlan

September in Mazatlán offers a delightful experience, boasting 242 hours of sunshine that evokes the calm of late summer. As part of a captivating pattern, this month shares the same sunlit tally as January, hinting at a coastal charm that remains steadfast throughout the year. Following a vibrant summer, where the sun bathed the city in over 280 hours per month, the transition into autumn brings a slight dip in sunlight, yet the warmth lingers. Notably, the city enjoys ample daylight almost year-round, with only June and September showing lower totals. This consistency underscores Mazatlán's allure as the perfect escape, where even in September, you can relive the sun-drenched days of summer while anticipating the crispness of fall.

Monthly Sunshine Duration in Mazatlan: September Highlighted

The September sunshine duration represents the total number of hours Mazatlan 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.
JanFebMarAprMayJunJulAugSepOctNovDec242h281h321h321h316h252h289h267h242h267h289h297h
Data source: Mazatlan September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Mazatlan During September

In Mazatlán, Mexico, the likelihood of sunny weather in September is notably low, with only a 7% chance of sunshine. This trend reflects the significant shift in weather patterns as summer transitions to fall. Throughout the summer months, from June to August, the likelihood of sunny skies plummets even further, peaking in February at a robust 74% before gradually declining. September often finds itself among the cloudier periods of the year, with minimal sun exposure, making it a less ideal choice for those chasing the sun. As autumn approaches, hope for sunnier days returns in October with a slight improvement to 16%, but for September, residents and visitors alike may need to prepare for more overcast skies.

Percentage of Sunny Days in September in Mazatlan

The chart illustrates the percentage of sunny days in Mazatlan 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 Mazatlan experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec46%74%68%68%39%5%14%8%7%16%46%66%
Data source: Mazatlan September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Mazatlan in September

In Mazatlán, Mexico, September marks a delightful transition in daylight duration, offering around 12 hours of bright sunshine each day. As we progress from the summer months, where daylight peaks at 13 hours in June and July, September gracefully maintains this luminous pattern before gradually dipping to 11 hours by October. This consistent light during September not only enhances the vibrant coastal scenery but also invites visitors to enjoy an array of outdoor activities against the backdrop of a stunning sunset, making it an ideal time for exploration and relaxation. Overall, September stands out as a month where the days are still abundant with light, setting a perfect stage for memorable experiences along Mazatlán's beautiful shores.

Average Daylight Hours in Mazatlan for September

The chart illustrates the variation in daylight duration in Mazatlan throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 12m11h 34m12h 2m12h 32m12h 56m13h 8m13h 2m12h 40m12h 12m11h 42m11h 17m11h 5m
Data source: Mazatlan daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Mazatlan

In September, Mazatlán experiences a gentle breeze with an average wind speed of 1.1 m/s (3 mph), marking a slight decline from the previous months. As the summer heat begins to wane, this soft wind creates a refreshing atmosphere, perfect for leisurely strolls along the picturesque beaches. Notably, wind speeds are at their lowest for the year, mirroring the overall trend of decreasing wind as the months progress from the breezier spring and early summer. As the city transitions into the fall, the tranquil winds of September are ideal for those seeking a serene escape, making it a delightful time to enjoy Mazatlán's coastal charm.

Average September Wind Speed in Mazatlan

The chart displays monthly wind speed patterns in Mazatlan, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.41.61.61.81.51.11.21.21.1 m/s1.21.21.2
Data source: Mazatlan September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Mazatlan Compares to Other Months

The weather in Mazatlan 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 Mazatlan and find detailed weather information for every month.

September and January exhibit quite distinct weather patterns. In September, temperatures range from a minimum of 15°C (59°F) to a maximum of 29°C (84°F), with an average of 20°C (68°F). The month is characterized by high humidity at 82% and significant rainfall, totaling 412 mm (16.2 in) over 28 days. In contrast, January experiences milder temperatures, with a minimum of 9°C (48°F) and a maximum reaching 29°C (85°F), resulting in an average of 18°C (65°F). Rainfall in January is minimal, only 10 mm (0.4 in) over just 1 day, and the humidity drops to a comfortable 65%. For more details, you can check Mazatlan weather in January.

September and February present quite contrasting weather patterns. In September, temperatures range from a minimum of 15°C (59°F) to a maximum of 29°C (84°F), with an average of 20°C (68°F). This month is characterized by high precipitation, averaging 412 mm (16.2 in) over 28 wet days, and a humidity level of 82%, making the air feel quite heavy and moist. In contrast, February sees milder temperatures, with a minimum of 9°C (48°F) and a maximum reaching 31°C (88°F), while maintaining an average temperature of 19°C (67°F). Notably, February is much drier, with only 5 mm (0.2 in) of rain falling over one day, and a significantly lower humidity level of 61%, resulting in a much more comfortable atmosphere. For further details, you can check out Mazatlan weather in February.

When comparing the weather between September and March, we see notable differences. September tends to be much wetter, with an average precipitation of 412 mm over 28 days, while March experiences a much drier climate, receiving only 13 mm of rain over just 3 days. In terms of temperature, September has a minimum of 15°C (59°F) and a maximum of 29°C (84°F), whereas March offers a slightly warmer average temperature with a minimum of 11°C (52°F) and a maximum of 32°C (90°F). Additionally, the humidity in September is notably high at 82%, in contrast to March's more comfortable 59%. For a more detailed look at the weather specifics in March, check out Mazatlan weather in March.

When comparing the weather in September and April, notable differences emerge in temperature, precipitation, and humidity. September tends to have milder temperatures, with an average of 20°C (68°F) and a high of 29°C (84°F), while April is generally warmer, boasting an average of 22°C (71°F) and a maximum of 34°C (93°F). In terms of rainfall, September is significantly wetter, receiving 412 mm (16.2 in) of precipitation over 28 days, whereas April has a much drier climate, with only 35 mm (1.4 in) of rain across just 5 days. Additionally, September's humidity is higher at 82%, compared to April's more comfortable 62%. For a closer look at what April weather is like, check out Mazatlan weather in April.

Comparing the weather in September and May reveals some notable differences. September tends to be a bit warmer overall, with average temperatures reaching 20°C (68°F) and maximums climbing to 29°C (84°F). However, it also experiences higher humidity at 82% and significantly more precipitation, totaling 412 mm (16.2 in) over 28 days. In contrast, May is slightly cooler with an average of 22°C (71°F) and temperatures peaking at 32°C (90°F). It is much drier, with only 155 mm (6.1 in) of rainfall spread over 19 days and relatively lower humidity at 73%. For more details on the pleasant weather conditions during May, you can check out Mazatlan weather in May.

In September, temperatures range from a minimum of 15°C (59°F) to a maximum of 29°C (84°F), with an average of around 20°C (68°F). The month sees significant rainfall, accumulating to 412 mm (16.2 in) over 28 days, and maintains a high humidity level of 82%. In contrast, June generally has slightly warmer temperatures, with a minimum of 14°C (58°F) and a maximum of 30°C (87°F), and it averages at 20°C (69°F). Rainfall in June is less intense, totaling 367 mm (14.4 in), yet it also experiences precipitation across 28 days, with humidity at 78%. For a more detailed look at June weather, you can check Mazatlan weather in June.

In comparing the weather between September and July, we notice that both months have similar temperature ranges, with July experiencing a minimum of 14°C (58°F) and a maximum of 29°C (85°F), while September's temperatures range from a minimum of 15°C (59°F) to a maximum of 29°C (84°F). The average temperature remains relatively stable, around 20°C (68°F for September and 69°F for July). However, September is notably wetter, with 412 mm (16.2 in) of precipitation over 28 days, compared to July's 357 mm (14.0 in) over 29 days. Humidity also slightly increases in September, reaching 82% compared to 79% in July. For more detailed insights, check out Mazatlan weather in July.

Comparing the weather of September and August reveals some intriguing similarities and differences. Both months experience temperatures ranging from a minimum of 15°C (59°F) to an average of 20°C (68°F), with September seeing a slightly warmer maximum of 29°C (84°F) compared to August’s 28°C (83°F). However, September is notably wetter, with 412 mm (16.2 in) of precipitation over 28 days, whereas August has higher precipitation at 517 mm (20.4 in) across 30 days. Despite the similar humidity levels of 82% in both months, these factors contribute to a noticeably more balanced weather experience in September. For those interested in exploring the weather specifics, you can find more details here: Mazatlan weather in August.

In September, the weather features a minimum temperature of 15°C (59°F), an average of 20°C (68°F), and a maximum of 29°C (84°F). However, it also brings significant rainfall with 412 mm (16.2 in) spread over 28 days, resulting in higher humidity levels at 82%. In contrast, October sees slightly cooler temperatures, with a minimum of 13°C (56°F) while maintaining the same average maximum of 29°C (84°F). The month experiences considerably less rainfall, with only 256 mm (10.1 in) over 25 days, leading to a decrease in humidity to 79%. For more detailed information, you can check Mazatlan weather in October.

In September, the weather tends to be warmer and much wetter, with temperatures ranging from a minimum of 15°C (59°F) to a maximum of 29°C (84°F) and an average temperature of 20°C (68°F). The month also experiences significant rainfall, totaling 412 mm (16.2 in) over 28 days, leading to high humidity levels of 82%. In contrast, November offers a cooler climate, with a minimum temperature of 11°C (52°F) and an average temperature of 19°C (67°F), while still reaching a similar maximum of 29°C (85°F). The precipitation in November significantly decreases to 55 mm (2.2 in) over just 9 days, and humidity falls to 72%. For more detailed information on November weather, check this link: Mazatlan weather in November.

In September, temperatures range from a minimum of 15°C (59°F) to a maximum of 29°C (84°F), with an average of 20°C (68°F). The month is characterized by significant rainfall, totaling 412 mm (16.2 in) spread over 28 days, and high humidity levels at 82%. In contrast, December experiences cooler temperatures, with a minimum of 9°C (48°F) and maintaining a maximum of 29°C (85°F), an average of 18°C (65°F). The weather is drier, with only 15 mm (0.6 in) of precipitation occurring over just 4 days and a lower humidity of 70%. For more details, feel free to check Mazatlan weather in December.

Compare Mazatlan's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Mazatlan

In September, Mazatlán experiences a unique blend of warmth and moisture, setting it apart from other months. With maximum temperatures reaching a comfortable 29°C, it’s ideal for those looking to enjoy the beach while also feeling the refreshing embrace of higher humidity levels at 82%. However, this month is characterized by frequent rainfall, with nearly every day seeing some precipitation, totaling a substantial 412 mm throughout the month. This contrasts sharply with the drier and sunnier conditions of the peak summer months and the cooler, more temperate weather that follows in the fall. For those interested in understanding the full scope of Mazatlán's climate, visit Mazatlan Climate for detailed insights.