September Weather in Loreto, Mexico

Last updated: April 22, 2025

Experience the vibrant climate of Loreto, Mexico in September, where the weather is a delightful mix of warm days and cool nights. With maximum temperatures reaching 29°C (85°F) and an average of 19°C (67°F), this coastal paradise offers a comfortable escape from the heat. However, evenings can be brisk, dipping to a minimum of 9°C (48°F). Be prepared for the moisture in the air, as humidity hovers around 81% and rainfall totals approximately 117 mm (4.6 in) over the month, spread across 14 rainy days. Whether you're planning outdoor adventures or relaxing by the beach, September in Loreto promises a unique blend of sun and refreshing showers.

September Temperature in Loreto

September in Loreto, Mexico, offers a delightful transition as summer gradually fades. With minimum temperatures around 9°C (48°F) and an average comfortable climate of 19°C (67°F), the month serves as a gentle reminder of the pleasant warmth of the season. Average highs can reach 29°C (85°F), striking a perfect balance between sunny days and cooler evenings. This month stands out for its notable shift from the extreme heat of July and August; it marks a gradual decline in temperatures, paving the way for the cooler months ahead. As the sizzle of summer wanes, September becomes an inviting time for outdoor adventures, making it a perfect month to explore the natural beauty and rich culture of Loreto.

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

The chart illustrates September temperature patterns in Loreto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec566065697271686966656056
Data source: Temperature data for Loreto 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 Loreto

September marks a significant peak in precipitation for Loreto, Mexico, with 117 mm (4.6 in) of rainfall, making it one of the wettest months of the year. This rise in moisture is accompanied by an increase in rainy days, reaching 14 days, which contributes to the vibrant ecosystem and lush surroundings. Following August's 79 mm (3.1 in), September's deluge not only serves as a transition into the cooler autumn months but also signals the tail-end of the rainy season. As patterns suggest, the summer months—especially from June to September—experience heightened rainfall, while the rest of the year remains relatively dry, highlighting the region's stark seasonal contrasts. This seasonal shift beautifully encapsulates Loreto's unique climatic rhythm, enriching its natural beauty and allure for visitors.

September Precipitation Trends in Loreto

The chart displays monthly precipitation patterns in Loreto, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1094321981107911740128
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Loreto

In September, Loreto, Mexico experiences a notable rise in humidity, reaching a peak of 81%. This shift marks the transition from the relatively drier summer months, where humidity dipped to the low 60s in July and August. Following the tropical patterns typical for this region, September's increased moisture sets the stage for the approaching autumn, where humidity levels continue to climb, culminating at a humidity rate of 85% in October. The pattern suggests a dynamic climate, where the balance of warm temperatures and elevated humidity creates a vibrant, lush environment, influencing both the landscape and the overall experience of this beautiful coastal destination.

September Average Humidity in Loreto

This chart illustrates the average monthly humidity levels in Loreto, 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.
JanFebMarAprMayJunJulAugSepOctNovDec75%69%65%64%75%78%67%64%82%86%87%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Loreto

In September, Loreto’s UV Index remains a striking 14, consistent with the previous month and indicating an extreme level of sun exposure that requires caution. With a burn time of just 10 minutes, it's crucial for residents and visitors alike to take protective measures when enjoying the sun. This trend of elevated UV levels persists from February through October, highlighting Loreto as a sunny destination for most of the year but also emphasizing the importance of sun safety. As the summer transitions to fall, remember to check the latest information at Loreto UV Index to stay informed and protected during your outdoor adventures!

Maximum UV Index Levels in Loreto for September

The chart shows the monthly maximum UV Index (UVI) for Loreto 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.
JanFebMarAprMayJunJulAugSepOctNovDec9111415151414141412108
Data source: Loreto 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 Loreto

In Loreto, Mexico, September marks a delightful transition, boasting approximately 297 hours of sunshine—a slight dip from the sun-soaked heights of the peak summer months. Following the summer's consistent warmth where sunshine peaked at 349 hours in May, the days gradually shorten, yet September's sunny disposition remains vibrant. This month stands as a beautiful reminder of the lingering summer, outshining the earlier winter months with notable brightness while paving the way for the cooler temperatures of autumn. As the year progresses, sunshine hours gracefully decline, illustrating the rhythmic dance of seasons, but September holds onto a sweet balance of warmth and light, perfect for outdoor adventures and relaxing beach days.

Monthly Sunshine Duration in Loreto: September Highlighted

The September sunshine duration represents the total number of hours Loreto 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.
JanFebMarAprMayJunJulAugSepOctNovDec230h268h317h328h349h332h336h336h297h293h280h284h
Data source: Loreto September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Loreto During September

As summer gives way to autumn, September in Loreto, Mexico experiences a notable dip in sunshine, with only a 27% chance of sunny days. This marks a significant drop from the preceding months of July and August, which are characterized by even lower sunshine probabilities at 31% and 48%, respectively. Following the vibrant days of spring, where chances soar the highest in February (83%), there seems to be a pattern of diminishing sunlight as the year progresses towards the fall months. Consequently, if you're seeking bright, sunny weather, it might be wise to keep September on your radar as a less favorable time to soak up the sun in Loreto.

Percentage of Sunny Days in September in Loreto

The chart illustrates the percentage of sunny days in Loreto 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 Loreto experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec62%83%71%69%69%35%31%48%27%50%67%69%
Data source: Loreto September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Loreto in September

In September, Loreto, Mexico, enjoys a pleasing 12 hours of daylight, maintaining the same sunny duration as the previous month. This month marks a transition as the summer days begin to shorten, ushering in a gradual descent in daylight as we approach autumn. From a peak of 13 hours in the summer months of May through July, the daylight starts to recede, settling into a comfortable rhythm. As the year progresses, the pattern clearly illustrates a gentle ebb in sunlight, with October and November bringing 11 hours each, before tapering off to 10 hours in the depths of winter. This cyclical change in daylight not only fosters a dynamic environment but also enhances the allure of Loreto's landscapes throughout the year.

Average Daylight Hours in Loreto for September

The chart illustrates the variation in daylight duration in Loreto throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 56m11h 24m12h 1m12h 40m13h 11m13h 27m13h 18m12h 50m12h 14m11h 35m11h 3m10h 47m
Data source: Loreto daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Loreto

In September, Loreto, Mexico, experiences a gentle breeze with an average wind speed of only 2.3 m/s (5 mph), marking a noticeable dip from the summer months. As the year progresses, the wind speeds gradually decrease, reaching their lowest point in this early fall month. This trend of diminishing winds is a contrast to the more robust breezes felt in April and August, which often hover around 3.2 to 3.5 m/s. The subtle winds of September provide a tranquil backdrop, perfect for experiencing the serene beauty of Loreto’s landscapes, making it an ideal time for leisurely outdoor activities as the summer heat begins to wane. As autumn approaches, the calm winds invite both relaxation and exploration, creating a peaceful atmosphere for residents and visitors alike.

Average September Wind Speed in Loreto

The chart displays monthly wind speed patterns in Loreto, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.93.43.33.53.13.02.53.22.3 m/s2.62.72.3
Data source: Loreto September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Loreto Compares to Other Months

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

In September, the weather is characterized by a mild to warm temperature range, with minimums around 9°C (48°F) and maximums reaching up to 29°C (85°F). The month sees significant rainfall, with about 117 mm (4.6 in) of precipitation spread over 14 days and a relatively high humidity level of 81%. In contrast, January experiences cooler conditions, with temperatures ranging from a minimum of -1°C (30°F) to a maximum of 26°C (80°F). The winter month is much drier, with only 9 mm (0.4 in) of precipitation over just 2 days, and humidity at a lower 75%. For a detailed look at what to expect in January, check out Loreto weather in January.

September and February present distinctly different weather patterns. September boasts milder temperatures, with averages around 19°C (67°F) and highs reaching 29°C (85°F), accompanied by significant rainfall of 117 mm (4.6 inches) spread over 14 days, resulting in a humid environment with 81% humidity. In contrast, February experiences cooler temperatures, with averages of 15°C (60°F) and highs peaking at 30°C (86°F), but it remains considerably drier, with only 8 mm (0.3 inches) of precipitation over just one day and a lower humidity of 69%. For more details on February weather, you can check out Loreto weather in February.

When comparing the weather in September and March, several notable differences emerge. September tends to be more humid, averaging 81% with rainfall of 117 mm over 14 days, while March features significantly lower humidity at 65% and only minimal precipitation of 4 mm across a single day. Temperature-wise, September ranges from a cooler 9°C (48°F) to a more pleasant average of 19°C (67°F) and peaks at 29°C (85°F). In contrast, March starts with a lower minimum of 3°C (38°F) but can reach an impressive maximum of 33°C (91°F), making it the warmer month overall. For a detailed look at the weather in March, check out Loreto weather in March.

When comparing the weather in September and April, it's evident that April tends to have warmer temperatures, with an average of 20°C (69°F) and highs reaching up to 33°C (92°F), whereas September features a broader temperature range, averaging 19°C (67°F) with maximums of 29°C (85°F). In terms of precipitation, September is significantly wetter, receiving 117 mm (4.6 in) over 14 days, while April is quite dry with only 3 mm (0.1 in) over just one day. Additionally, the humidity in September is higher at 81%, compared to April's 64%, making September feel more humid and potentially less comfortable. For a detailed look at April's weather, refer to Loreto weather in April.

When comparing the weather in September and May, several notable differences emerge. September tends to be cooler, with average temperatures ranging from a minimum of 9°C (48°F) to a maximum of 29°C (85°F), while May is generally warmer, with minimums around 8°C (47°F) and maximums reaching up to 35°C (95°F). Additionally, September experiences significantly more precipitation, averaging 117 mm (4.6 in) over 14 days, compared to May’s much drier conditions, which only see around 21 mm (0.8 in) over just 3 days. The humidity is also higher in September at 81%, compared to May's 75%, making the latter a more comfortable time of year overall. For more details, you can check Loreto weather in May.

When comparing the weather in September and June, it's evident that June generally experiences warmer temperatures, with averages around 21°C (71°F) and maximums reaching up to 35°C (95°F), while September's average is slightly cooler at 19°C (67°F), peaking at 29°C (85°F). Additionally, both months see a similar amount of rainfall, but September has a higher average precipitation of 117 mm (4.6 in) over 14 days compared to June's 98 mm (3.9 in) across 12 days. Humidity levels are also comparable, with September at 81% and June at 78%. For more detailed information, check out Loreto weather in June.

In comparing the weather of September and July, September tends to be slightly cooler, with average temperatures ranging from a minimum of 9°C (48°F) to a maximum of 29°C (85°F), while July showcases a warmer range with minimum temperatures of 12°C (54°F) and maximums reaching 31°C (89°F). Precipitation levels are similar, with September recording 117 mm (4.6 in) and July close behind at 110 mm (4.3 in), both spread across 14 days. Additionally, September has higher humidity at 81%, compared to July's 67%, contributing to a more muggy feel as the summer winds down. For more detailed insights on July weather, you can visit Loreto weather in July.

In comparing the weather of September and August, September exhibits a noticeable cooling trend with average temperatures dropping from August's 21°C (69°F) to 19°C (67°F). While August experiences higher maximum temperatures peaking at 31°C (89°F), September's high reaches 29°C (85°F), suggesting a gradual transition towards autumn. Additionally, September is wetter, with 117 mm (4.6 in) of precipitation over 14 days, compared to August's 79 mm (3.1 in) over just 10 days. The humidity also rises in September, averaging 81% versus August's 64%, indicating a more humid atmosphere as summer wanes. For further insights, you can check Loreto weather in August.

In comparing the weather between September and October, we see a noticeable shift. While September enjoys an average temperature of 19°C (67°F) with highs reaching up to 29°C (85°F), October experiences a slight dip, averaging 18°C (65°F) but maintaining the same maximum temperature. Precipitation also decreases significantly, with September receiving 117 mm (4.6 in) over 14 days, while October only sees 40 mm (1.6 in) over just 6 days. Humidity remains fairly constant, rising from 81% in September to 85% in October. For more detailed insights on October weather, you can visit Loreto weather in October.

September and November exhibit distinct differences in weather patterns. September features a broader temperature range, with minimums at 9°C (48°F) and maximums reaching 29°C (85°F), while November's temperatures are slightly milder, ranging from a minimum of 0°C (32°F) to a maximum of 28°C (84°F). Precipitation in September is significantly higher at 117 mm (4.6 in) over 14 days, compared to November's sparse 12 mm (0.5 in) over just 1 day, indicating a much drier month. Additionally, humidity levels in November are moderately higher at 87%, compared to September’s 81%. For a detailed look at the weather in November, visit Loreto weather in November.

The weather in September is warm and relatively humid, with average temperatures ranging from a cool 9°C (48°F) at night to a high of 29°C (85°F) during the day. This month also sees considerable precipitation, averaging 117 mm (4.6 in) over about 14 days, making it one of the wetter months. In contrast, December experiences much colder weather, with minimum temperatures dropping to -6°C (22°F) and average highs at 28°C (82°F). The month is significantly drier, with just 8 mm (0.3 in) of precipitation over only one day, though it maintains a high humidity level of 87%. For more detailed insights, you can refer to Loreto weather in December.

Compare Loreto's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Loreto

As September rolls in, Loreto experiences a distinct shift in its weather, contrasting with the drier heat of summer. The temperatures are notably moderate, offering a comfortable average that invites outdoor exploration, yet the month is marked by increased humidity and a significant rise in rainfall, making it one of the wetter periods of the year. With approximately half the days being rainy, visitors should prepare for occasional showers amid the warm, tropical atmosphere. This blend of warmth and moisture creates a lush environment, perfect for experiencing Loreto's vibrant natural beauty. For a detailed overview of how September fits into the broader patterns of the year, check out Loreto Climate.