Last updated: April 22, 2025
Experience the September weather in Santa Barbara, Mexico, characterized by a pleasant average temperature of 20°C (68°F), with daily highs reaching up to 32°C (89°F) and nighttime lows dipping to 9°C (49°F). This month brings significant precipitation, with 109 mm (4.3 in) of rainfall spread over 18 days, lending a lush vibrancy to the local landscape. Humidity levels remain high at 84%, creating a warm, tropical atmosphere that envelops the area. Whether you are planning outdoor activities or simply enjoying the local scenery, September offers a unique blend of warmth and moisture, making it an enchanting time to visit.
In September, Santa Barbara, Mexico experiences a delightful transition as the summer warmth begins to wane. With minimum temperatures around 9°C (49°F) and an average of about 20°C (68°F), the climate remains pleasantly mild, making it perfect for outdoor adventures. The highs can reach a comfortable 32°C (89°F), keeping the spirit of summer alive while hinting at the cooler autumn months ahead. Compared to the vibrant warmth of July and August, which sustain average temperatures around 21°C (70°F) and maxima in the low 30s°C, September offers a refreshing balance, inviting visitors to soak in the enduring sunshine without the peak heat. This gradual cooling trend sets the stage for the beautiful fall season that follows.
September marks a significant peak in precipitation for Santa Barbara, Mexico, receiving 109 mm (4.3 in) of rain over the course of 18 days. This surge is a notable increase from the preceding months, reflecting the region’s transition into a wetter season. Following a relatively dry summer, where rainfall ranged from 75 mm in July to 76 mm in August, September emerges as the month with the highest rainfall, while simultaneously also featuring the most rain days. The uptick can be attributed to seasonal changes, indicating the onset of fall storms. As October approaches, rainfall diminishes to 62 mm (2.4 in), suggesting a gradual return to drier conditions, yet the lush aftermath of September's rains often leaves the landscape vibrant and renewed.
September in Santa Barbara, Mexico, experiences a notable shift in humidity, clocking in at 84%. This month serves as a transition point as summer draws to a close, showcasing a slight increase from August's 74%. The trend throughout the year reveals a pattern of elevated humidity, particularly in the cooler months of late fall and winter, where figures peak at around 91% in November and December. Fall begins to regain some moisture with the September readings, hinting at the wetter months ahead. As humidity levels fluctuate, they underscore the coastal area's rich, lush environment, inviting both residents and visitors to enjoy the unique climate before the heavy rains of October set in.
As September rolls into Santa Barbara, Mexico, sunlight intensity remains notably high with a UV Index of 14, classified as extreme. This signifies continuity in a striking pattern established during the summer months, where the UV Index consistently stayed around the same level from June to August. With a burn time of just 10 minutes, it's essential for residents and visitors alike to take proper precautions against harmful UV exposure. As the year progresses into October, the UV Index does dip slightly to 12, yet remains in the extreme category. For detailed UV forecasts and safety tips, check out Santa Barbara UV Index.
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September in Santa Barbara, Mexico, offers a delightful transition into autumn with 270 hours of sunshine, perfectly complementing the lingering warmth of summer. As the month rolls in, it showcases a gradual decline from the sun-soaked heights of May’s 330 hours and the vibrant summer months of July and August, both hovering around 312 and 305 hours respectively. This slight dip in sunshine hours continues into October, which receives 267 hours, suggesting a gentle embrace of the cooler fall season. Despite this decrease, September remains a golden time, allowing visitors to bask in the tail end of summer while enjoying the vibrant colors and tranquil atmosphere that this coastal paradise has to offer.
In Santa Barbara, Mexico, September marks one of the least sunny months, with just a 14% chance of clear skies. This trend of diminishing sunshine begins in the early summer, with chances plummeting from 48% in May to a mere 14% in September. Following a brief uptick in October, the likelihood of sunny weather gradually improves as the year progresses, with November boasting a 43% chance and December rising to 63%. Overall, September stands out as a notably drizzly month, contrasting sharply with the brighter spells that envelope other times of the year. If you're planning a visit, be prepared for overcast skies and a higher chance of rain.
In Santa Barbara, Mexico, September marks the shift towards shorter days as daylight stretches to about 12 hours. This duration is consistent with the previous month, August, which also enjoys a generous amount of sunlight. The trend for the year showcases gradual increases from 11 hours in January and February to a peak of 13 hours from May to July. As summer wanes, daylight remains stable in September before gradually declining into October and beyond. This pattern reflects the region's temperate climate, offering a balanced mix of light and warmth as the year transitions to autumn.
As September unfolds in Santa Barbara, Mexico, the winds begin to whisper a gentle lull, with an average speed dipping to just 1.8 m/s (4 mph). This marks a notable decline from the slightly breezier months preceding it, revealing a trend of calmness that characterizes the transition into autumn. After enjoying relatively consistent speeds throughout the summer, September’s breezes invite a more tranquil atmosphere, perfect for leisurely strolls by the beach or serene moments in nature. With wind speeds gradually rising again in October, this brief period of softness highlights the unique charm of Santa Barbara's seasonal shifts.
The weather in Santa Barbara 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 Santa Barbara and find detailed weather information for every month.
September is characterized by warm temperatures, with a minimum of 9°C (49°F) and an average of 20°C (68°F), peaking at 32°C (89°F). It is also a relatively wet month, receiving 109 mm (4.3 in) of precipitation over 18 days, along with high humidity at 84%. In contrast, January sees cooler weather, with a minimum of 1°C (34°F) and an average of 15°C (59°F), while still reaching a maximum of 30°C (87°F). January is significantly drier, with only 6 mm (0.2 in) of rain over a single day, and slightly higher humidity at 88%. For more detailed insights into January weather, you can check Santa Barbara weather in January.
September and February offer contrasting weather experiences. In September, temperatures range from a minimum of 9°C (49°F) to a maximum of 32°C (89°F), averaging around 20°C (68°F). This month also sees considerable rainfall, totaling 109 mm (4.3 inches) over 18 days, and maintains high humidity levels at 84%. In contrast, February showcases milder conditions with a minimum temperature of 2°C (37°F) and a maximum of 34°C (93°F), averaging 17°C (64°F). Notably, February is much drier, receiving only 5 mm (0.2 inches) of precipitation over just 1 day, and features slightly higher humidity at 86%. For a closer look at February's conditions, check out Santa Barbara weather in February.
September and March offer distinctly different weather experiences. In September, temperatures range from a cool 9°C (49°F) to a warm 32°C (89°F), with an average of 20°C (68°F). This month also sees significant rainfall, averaging 109 mm (4.3 in) over 18 days, resulting in high humidity levels of 84%. In contrast, March has milder temperatures, with a minimum of 4°C (39°F) and a maximum of 35°C (95°F), while maintaining an average of 20°C (67°F). Notably, March is much drier, receiving only 13 mm (0.5 in) of precipitation over just one day, and the humidity remains relatively similar at 83%. For more detailed information about March weather, you can check Santa Barbara weather in March.
In comparing the weather of September and April, we find notable differences in temperature and precipitation. September experiences a wider temperature range, with a minimum of 9°C (49°F) and a maximum of 32°C (89°F), averaging around 20°C (68°F). In contrast, April has a slightly lower minimum temperature of 8°C (46°F) but reaches higher highs, peaking at 35°C (95°F) with an average of 22°C (72°F). April is considerably drier, receiving only 17 mm (0.7 in) of precipitation over just 4 days, while September sees much more rain, totaling 109 mm (4.3 in) across 18 days, contributing to a higher humidity level of 84% compared to April's 80%. For a closer look at April weather specifics, you can visit Santa Barbara weather in April.
When comparing the weather in September and May, we see distinct differences that mark each month. September experiences a wider temperature range, with minimums around 9°C (49°F) and maximums peaking at 32°C (89°F), characterized by higher precipitation at 109 mm (4.3 in) over 18 days. In contrast, May offers slightly warmer temperatures, with minimums of 11°C (52°F) and maximums reaching 36°C (96°F). Additionally, May enjoys significantly less rainfall, totaling only 34 mm (1.3 in) across just 8 days, and slightly lower humidity levels at 82%. For those looking to explore the beauty of Santa Barbara, detailed weather insights can be found here: Santa Barbara weather in May.
In comparing the weather of September and June, we can see some noteworthy differences. September features a minimum temperature of 9°C (49°F) and can reach up to 32°C (89°F), with an average temperature of 20°C (68°F). In contrast, June enjoys slightly warmer temperatures with a minimum of 11°C (53°F) and a maximum reaching 34°C (94°F), resulting in an average temperature of 21°C (71°F). While both months experience considerable precipitation, September sees a total of 109 mm (4.3 in) over 18 days, slightly more than June's 102 mm (4.0 in) over 16 days. Additionally, September has higher humidity at 84%, compared to June's 79%. For more detailed insights into June weather in this area, you can visit Santa Barbara weather in June.
In comparing the weather in September and July, we notice notable differences in temperature and humidity. September experiences cooler minimum temperatures, averaging around 9°C (49°F), whereas July starts at a warmer 14°C (57°F). Both months share a similar maximum temperature, peaking at about 32°C (89°F in September and 90°F in July). However, September is marked by higher precipitation levels, with 109 mm (4.3 in) spread across 18 days, compared to July’s 75 mm (3.0 in) over 15 days. Additionally, humidity is higher in September at 84%, compared to 72% in July, making September feel slightly more damp. For more specifics on July’s weather, visit Santa Barbara weather in July.
In comparing the weather between August and September, we see a noticeable shift in temperatures and precipitation patterns. September experiences a broader range of temperatures, with a minimum of 9°C (49°F) and a maximum that matches August at 32°C (89°F). The average temperature in September is slightly lower at 20°C (68°F), compared to August's 21°C (70°F). Humidity levels are higher in September at 84%, while August maintains a more moderate humidity of 74%. Additionally, September sees increased precipitation, totaling 109 mm (4.3 in) over 18 days, whereas August records 76 mm (3.0 in) across 14 days. For more detailed insights, you can refer to Santa Barbara weather in August.
September and October exhibit notable differences in weather patterns. In September, temperatures range from a minimum of 9°C (49°F) to a maximum of 32°C (89°F), with an average of 20°C (68°F). This month also experiences higher precipitation at 109 mm (4.3 in) over 18 days, resulting in a humidity level of 84%. In contrast, October sees slightly cooler temperatures, with a minimum of 6°C (44°F) and a maximum of 30°C (87°F), averaging 19°C (66°F). The month is drier, with only 62 mm (2.4 in) of precipitation over 12 days and a higher humidity level of 92%. For more detailed climate information, check out Santa Barbara weather in October.
In comparing the weather between September and November, September tends to be warmer, with temperatures ranging from a minimum of 9°C (49°F) to a maximum of 32°C (89°F) and an average of 20°C (68°F). It also experiences significantly higher precipitation, with about 109 mm (4.3 in) falling over 18 days, leading to a humidity level of 84%. In contrast, November brings cooler temperatures that dip to a minimum of 0°C (33°F) and an average of 17°C (62°F), with a maximum of 30°C (87°F). Rainfall is minimal at only 19 mm (0.8 in) over just 3 days, and the humidity rises slightly to 91%. For more detailed insights into the weather conditions in November, you can refer to this link: Santa Barbara weather in November.
September and December present contrasting weather conditions. In September, temperatures range from a cooler 9°C (49°F) to a warm maximum of 32°C (89°F), with an average of 20°C (68°F). The month is marked by significant precipitation, totaling 109 mm over 18 days, and humidity remains high at 84%. In contrast, December features milder temperatures, with lows around 0°C (33°F) and highs reaching 29°C (85°F), and an average of 15°C (60°F). Importantly, December experiences minimal rainfall, with only 5 mm recorded across 0 days, along with slightly higher humidity at 91%. For a deeper dive into the specifics of December weather, check Santa Barbara weather in December.
In September, Santa Barbara transitions into a unique weather pattern characterized by increased humidity and higher precipitation compared to the drier summer months. While temperatures remain pleasantly warm, averaging around 20°C, the higher humidity levels can make the air feel more oppressive. This month often sees the tail end of the summer heat, with maximums reaching 32°C, creating a contrast to the cooler nights that dip down to approximately 9°C. The frequent rain—with about 18 days experiencing precipitation—sets September apart, inviting a lushness not found in the arid months before. For a deeper understanding of the weather nuances throughout the year, explore Santa Barbara Climate.