September Weather in San Lucas, Mexico

Last updated: April 22, 2025

In San Lucas, Mexico, September brings a warm embrace, with maximum temperatures reaching a sizzling 38°C (100°F) and an average comfortable 28°C (83°F). Evenings cool down slightly to a minimum of 22°C (72°F), providing a respite from the heat. However, this month is also characterized by significant precipitation, accumulating to 213 mm (8.4 in) over 25 rainy days, and a persistent humidity level of 85%. Visitors should be prepared for frequent showers amid the tropical warmth, making it a unique time to experience the lush beauty of the region.

September Temperature in San Lucas

In September, San Lucas experiences warm and inviting temperatures, with a minimum of 22°C (72°F) and an average of 28°C (83°F). The maximum temperature reaches a comfortable 38°C (100°F), marking a gentle transition from the summer heat, yet still offering plenty of sunshine. This month is characterized by a slight dip in daytime temperatures compared to the peak summer months of June through August, making it an ideal time for outdoor excursions and exploring the vibrant local culture. As the fall season approaches, the humidity remains prevalent, but the overall weather is still favorable, allowing visitors to enjoy the stunning surroundings while basking in the pleasant climate.

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

The chart illustrates September temperature patterns in San Lucas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec808286889086848483828179
Data source: Temperature data for San Lucas 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 San Lucas

In September, San Lucas, Mexico, experiences a remarkable continuation of its wet season, with precipitation totaling 213 mm (8.4 in), making it one of the heaviest rainfall months of the year. This follows a trend set in the preceding months of July and August, where rainfall peaked at 187 mm (7.4 in) and 218 mm (8.6 in), respectively. Interestingly, September boasts 25 rainy days, maintaining a vibrant atmosphere, though slightly less intense than the 26 days recorded in August. As the wet season progresses, the precipitation not only nourishes the lush landscape but also sets the stage for a rejuvenating transition into the drier months ahead.

September Precipitation Trends in San Lucas

The chart displays monthly precipitation patterns in San Lucas, 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.
JanFebMarAprMayJunJulAugSepOctNovDec120021168187218213168364
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Lucas

In September, San Lucas, Mexico, experiences a notable peak in humidity, reaching 85%—tying with August for the year's highest record. This is part of a rising trend observed from the summer months, where humidity climbs from 75% in May to a consistent 83% in June and July. Following a brief increase in October to 79%, humidity begins to gradually decrease as the year transitions into the cooler months. Overall, the consistent humidity levels during late summer and early fall create a lush and vibrant atmosphere, contributing to the area's natural beauty while highlighting the characteristic tropical climate of the region.

September Average Humidity in San Lucas

This chart illustrates the average monthly humidity levels in San Lucas, 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.
JanFebMarAprMayJunJulAugSepOctNovDec70%64%54%61%75%83%83%85%85%79%76%75%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Lucas

In September, San Lucas, Mexico, continues to experience a very high UV Index of 13, placing it firmly in the extreme exposure category with a burn time of only 10 minutes. This trend of sustained high UV levels from June through September signals that visitors and locals alike must remain vigilant and prioritize sun protection. As the summer wanes, the UV Index gradually decreases towards October, but the risks remain significant through this month. Ensuring proper precautions are in place is essential for enjoying the vibrant outdoor life San Lucas has to offer. For more detailed information, check the San Lucas UV Index.

Maximum UV Index Levels in San Lucas for September

The chart shows the monthly maximum UV Index (UVI) for San Lucas 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.
JanFebMarAprMayJunJulAugSepOctNovDec911131313141313131188
Data source: San Lucas 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 Lucas

September in San Lucas, Mexico, continues the delightful trend of abundant sunshine, offering 277 hours of glorious daylight. This month marks the gentle transition from the peak summer brightness of May, which boasts an impressive 335 hours. As the year progresses, sunshine hours gradually taper off, reflecting a steady decline from June's vibrant 289 hours. Despite this decline, September still shines brighter than the winter months ahead, maintaining a warm ambiance perfect for beach lovers and outdoor enthusiasts. The harmonious blend of sun and sea makes San Lucas a year-round paradise, with September's golden rays setting the stage for a beautiful autumn ahead.

Monthly Sunshine Duration in San Lucas: September Highlighted

The September sunshine duration represents the total number of hours San Lucas 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.
JanFebMarAprMayJunJulAugSepOctNovDec244h279h321h325h335h289h311h290h277h282h286h295h
Data source: San Lucas September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Lucas During September

In San Lucas, Mexico, the month of September offers a notably low chance of sunny weather, with only a 13% likelihood of clear skies. This decline in sunshine follows the summer months, where the probability plummets from 20% in August and 21% in July, indicating a trend of increasingly cloudier weather as the rainy season approaches its peak. Interestingly, this contrasts sharply with the sunny disposition of earlier months, such as February and March, which boast chances soaring above 80%. As fall sets in, San Lucas transitions from its summer heat and vibrant blue skies to a time of variable weather, making September a less favorable choice for sun seekers.

Percentage of Sunny Days in September in San Lucas

The chart illustrates the percentage of sunny days in San Lucas 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 Lucas experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec63%94%87%79%60%11%21%20%13%33%70%81%
Data source: San Lucas September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Lucas in September

In September, San Lucas continues to bask in the golden glow of 12 hours of daylight, a consistent feature carried over from the previous month. As the year progresses, daylight duration reached its peak during the summer months of June and July with 13 hours, before gradually tapering down in the fall. This trend reveals a balanced climate, ensuring that residents and visitors alike can enjoy ample daylight as summer transitions into the softer hues of autumn. Following September, daylight will once again decrease, rounding out the year with shorter days, but for now, there's still plenty of time to soak up the sun.

Average Daylight Hours in San Lucas for September

The chart illustrates the variation in daylight duration in San Lucas throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 9m11h 32m12h 2m12h 33m12h 59m13h 12m13h 5m12h 42m12h 12m11h 41m11h 14m11h 1m
Data source: San Lucas daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in San Lucas

As summer transitions to autumn in San Lucas, Mexico, the September winds whisper at a gentle 1.0 m/s (2 mph), mirroring the calmness of August and July. This consistent breeze marks a notable shift from the earlier months when stronger winds prevailed, peaking around 2.0 m/s (4 mph) in April. Throughout the year, there is a clear decline in wind speeds, especially in the sweltering summer months, suggesting a serene backdrop for the region. As the calendar turns towards October and November, these soft currents remain at a stable 1.0 m/s, hinting at the tranquil climate that defines this coastal paradise in the fall season.

Average September Wind Speed in San Lucas

The chart displays monthly wind speed patterns in San Lucas, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.31.51.82.01.81.21.01.01.0 m/s1.01.01.1
Data source: San Lucas September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in San Lucas Compares to Other Months

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

September and January showcase a stark contrast in weather conditions. In September, the temperatures range from a minimum of 22°C (72°F) to an average of 28°C (83°F), with peaks reaching up to 38°C (100°F). This month experiences significant rainfall, accumulating 213 mm (8.4 in) over 25 days, accompanied by high humidity levels at 85%. In contrast, January presents a cooler climate with minimum temperatures dropping to 13°C (56°F) and an average of 27°C (80°F). Remarkably, January sees virtually no precipitation, with only about 1 mm (0.1 in) of rain across the month and no rainy days, alongside lower humidity at 70%. For detailed insights into the January weather patterns, you can refer to San Lucas weather in January.

September and February present contrasting weather patterns. In September, temperatures range from a minimum of 22°C (72°F) to a maximum of 38°C (100°F), with an average temperature of 28°C (83°F). The month is characterized by high humidity at 85% and significant rainfall, totaling 213 mm (8.4 in) over 25 days. In stark contrast, February sees cooler temperatures with a minimum of 15°C (59°F) and a similar average of 28°C (83°F), reaching a maximum of 39°C (102°F). This month enjoys much drier conditions, with only 2 mm (0.1 in) of precipitation recorded on no days, and lower humidity at 64%. For more details about February weather, you can check San Lucas weather in February.

September and March present notably different weather patterns. September experiences a warm average temperature of 28°C (83°F) with highs reaching 38°C (100°F), accompanied by significant precipitation totaling 213 mm (8.4 in) across 25 days, and a high humidity level of 85%. In contrast, March boasts slightly cooler nighttime temperatures, with a minimum of 17°C (63°F) and an average of 30°C (87°F), but can peak at a scorching 41°C (107°F). Significantly, March sees no rainfall, resulting in a dry climate with just 54% humidity. For a detailed view of March weather, check San Lucas weather in March.

When comparing the weather in September and April, significant differences are evident. September experiences warmer temperatures with a minimum of 22°C (72°F), averaging around 28°C (83°F), and peaking at a scorching 38°C (100°F). This month is also characterized by high humidity at 85% and substantial precipitation, totaling 213 mm (8.4 in) across 25 days. In contrast, April boasts slightly cooler minimum temperatures at 18°C (66°F) and a much higher average of 31°C (89°F), with maximum temperatures soaring to 42°C (108°F). Remarkably, April sees no rainfall or humidity concerns, maintaining a drier climate with humidity at only 61%. For a more detailed look at April weather conditions, you can check San Lucas weather in April.

In comparing the weather in September and May, September tends to be slightly cooler overall, with average temperatures ranging from a minimum of 22°C (72°F) to a maximum of 38°C (100°F). However, it is also significantly wetter, with 213 mm (8.4 in) of precipitation spread over 25 days and a higher humidity of 85%. In contrast, May is hotter, with temperatures reaching up to 43°C (109°F) and a more tolerable average of 32°C (90°F). May experiences much less rainfall, approximately 21 mm (0.8 in) over just 3 days, contributing to a lower humidity of 75%. For more detailed insights, you can visit San Lucas weather in May.

When comparing the weather in September and June, September tends to be slightly cooler with an average temperature of 28°C (83°F), while June is warmer, averaging at 30°C (86°F). June also experiences higher maximum temperatures, reaching up to 41°C (106°F) compared to September's 38°C (100°F). In terms of precipitation, September is notably wetter, with 213 mm (8.4 in) falling over 25 days, whereas June sees 168 mm (6.6 in) across 19 days. Humidity levels are similar in both months, with September at 85% and June at 83%. For more detailed information about June weather, you can visit San Lucas weather in June.

When comparing the weather between September and July, we see that both months have similar minimum temperatures at 22°C (72°F), but July tends to be slightly warmer on average, with an average temperature of 29°C (85°F) compared to September's average of 28°C (83°F). July also experiences higher maximum temperatures, reaching up to 40°C (104°F), while September peaks at 38°C (100°F). Precipitation is more significant in September, with 213 mm (8.4 in) of rain over 25 days, compared to July's 187 mm (7.4 in) during the same number of days. Both months have high humidity levels, with September at 85% and July at 83%, indicating a muggy atmosphere throughout. For more detailed weather insights, you can check San Lucas weather in July.

In comparing the weather between September and August, we see some notable similarities and differences. Both months experience a minimum temperature of 22°C (72°F), but September has a slightly lower average temperature at 28°C (83°F) compared to August's 29°C (84°F). The maximum temperatures are also comparable, with September reaching 38°C (100°F) and August peaking at 39°C (102°F). Precipitation is similar in both months, with September recording 213 mm (8.4 in) over 25 days, slightly less than August's 218 mm (8.6 in) over 26 days. Humidity remains constant at 85% for both months, creating a consistently humid environment. For more detailed insights, you can explore San Lucas weather in August.

In September, the weather tends to be notably warmer, with minimum temperatures around 22°C (72°F) and maximums peaking at 38°C (100°F). This month also experiences high humidity levels at 85% and substantial precipitation, averaging 213 mm (8.4 in) over 25 days. In contrast, October sees slightly cooler weather, with minimum temperatures dropping to 21°C (70°F) and maximums reaching 36°C (98°F). Precipitation decreases to 168 mm (6.6 in) over 18 days, and humidity levels drop to 79%, making October a bit more comfortable. For more detailed insights, check out San Lucas weather in October.

September and November present notably different weather conditions. In September, temperatures are typically warmer, with minimums around 22°C (72°F) and maximums reaching up to 38°C (100°F). The month is also marked by high humidity at 85% and significant rainfall, with 213 mm (8.4 in) occurring over 25 days. Conversely, November sees a drop in temperature, with minimums of 15°C (59°F) and an average temperature of 27°C (81°F). Precipitation decreases dramatically to just 36 mm (1.4 in) over 5 days, and humidity also falls to 76%. For more detailed information, check out San Lucas weather in November.

In September, the weather is characterized by significantly warmer temperatures, with daily highs reaching up to 38°C (100°F) and an average of 28°C (83°F). This month also experiences high humidity levels at 85% and considerable rainfall, measuring 213 mm (8.4 in) over 25 days. In contrast, December presents a much cooler climate, with minimum temperatures dropping to 13°C (55°F) and an average of 26°C (79°F). Precipitation is minimal in December, only 4 mm (0.2 in) over the course of the month, and there are no rainy days, making it a much drier period. For a more detailed look at December weather, check out San Lucas weather in December.

Compare San Lucas's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in San Lucas

As September arrives in San Lucas, the weather shifts notably compared to other months. With high humidity levels hovering around 85%, this month is characterized by a combination of warmth and frequent rain, resulting in significant precipitation over nearly every day. The average temperature rests at a comfortable 28°C (83°F), yet the maximum can soar up to 38°C (100°F), presenting more sultry conditions than the preceding summer months. This unique blend of heat and moisture creates a lush atmosphere, distinguishing September as a month of transformation. For more detailed insight on what to expect throughout the year, check out San Lucas Climate.