Last updated: February 24, 2025
In September, Santa Monica experiences mild and pleasant weather, with temperatures soaring to a maximum of 37°C (100°F) and averaging around 22°C (72°F). Meanwhile, the nights cool down to a minimum of 14°C (57°F), providing a comfortable respite. With an impressively low precipitation amount of just 2 mm (0.1 in) and zero rainy days, the city basks in ample sunshine, complemented by a humidity level of 68%. This delightful climate makes September an ideal time to enjoy outdoor activities and the stunning coastal views that Santa Monica has to offer.
In September, Santa Monica experiences a delightful transition as summer begins to wane. With minimum temperatures averaging around 14°C (57°F) and rising to a comfortable average of 22°C (72°F), this coastal city showcases a perfect blend of warmth and cool breezes. The maximum temperatures can soar up to a sizzling 37°C (100°F), reflecting the lingering summer heat. As the month progresses, locals and visitors alike can enjoy outdoor activities in pleasantly mild conditions, making September an ideal time to revel in the beachside vibe before autumn sets in. With these trends, it's clear that Santa Monica remains a vibrant destination that balances warmth with refreshing coastal air.
In September, Santa Monica typically experiences a notable shift in its precipitation patterns, almost mirroring the dryness of summer months. With an average of only 2 mm (0.1 in) of rainfall recorded and no precipitation days, September marks a continuation of the arid conditions that started in late spring. This stark contrast to the wetter seasons, such as January (68 mm) and March (71 mm), illustrates a broader trend of decreasing rainfall during the summer and early fall. As residents enjoy the lingering warmth of summer, the lack of rain highlights the region's characteristic dry spell, paving the way for the slightly wetter months ahead in October and November.
In Santa Monica, September marks a gentle transition into drier conditions, with humidity dipping to 68%. This decline is part of a noticeable trend as summer fades; the highest humidity levels are typically seen in the early months of the year, peaking at 79% in February. As the seasons progress, the humidity gradually decreases, reaching its lowest point of 67% in October. The overall pattern indicates a comforting shift towards crisper air, making September an ideal time for outdoor activities under the Californian sun, while still enjoying a hint of coastal moisture.
In September, Santa Monica experiences a UV Index of 10, falling into the very high exposure category, which means that sun protection is essential to avoid sunburn in just 15 minutes. As summer transitions into fall, the UV levels remain elevated, similar to August’s readings but lower than the extreme levels observed in June and July. This trend indicates that while the sun begins to mellow, it still poses significant risks. It's a reminder to enjoy the sunny beaches while staying sun-safe. For more information on UV exposure, visit Santa Monica UV Index.
UV Risk Categories
As summer gracefully transitions into autumn, September in Santa Monica continues to bask in ample sunshine, totaling 314 hours of daylight. This marks a slight decrease from the sun-drenched July, which boasts a peak of 380 hours, yet still outshines the earlier months of the year. The month reflects a wonderful balance, bridging the vibrant energy of summer with the mellow charm of fall. Interestingly, September's sunshine hours mirror those of April, suggesting that while the seasons shift, Santa Monica maintains its allure with consistently bright days. As the days grow shorter in October, the warmth of September lingers in the hearts of both locals and visitors, making it a perfect time to embrace the beautiful coastal scenery before the cooler months set in.
September in Santa Monica heralds a delightful peak in sunny weather, boasting a 76% chance of sunshine—the highest percentage during the entire year. As summer transitions to fall, the region enjoys an abundance of clear skies, benefiting from the lingering warmth of summer. This uptick in sunlight follows a trend seen from the previous months, particularly August's 73%, setting the stage for outdoor activities and beach outings. With October still reflecting a healthy 70% chance of sunshine, September clearly stands out as the perfect month to soak in Santa Monica’s beach vibes and stunning sunsets.
As summer draws to a close in September, Santa Monica experiences a slight decline in daylight duration, with the sun gracing the skies for approximately 12 hours each day. This marks a transition from the peak summer months of June and July, where sunlight reached an impressive 14 hours. However, September still offers more sunlight than spring months, promoting outdoor activities in the crisp early fall air. Following this month, daylight hours will continue to shrink, paving the way for the shorter days of autumn and winter. This ebb and flow of daylight not only shapes daily routines but also enriches the vibrant atmosphere of this coastal haven.
As September rolls into Santa Monica, the coastal breezes begin to soften, with average wind speeds dipping to 2.2 m/s (5 mph). This marks a gentle decline from the earlier months of summer, where winds hovered around 2.3 m/s in July and August. Following a steady trend, the wind starts to taper off, signaling the transition into the crispness of autumn. While January through April typically enjoy a slightly brisker atmosphere, with averages around 2.7 m/s to 2.9 m/s, September ushers in a calmer, more serene environment, inviting locals and visitors alike to bask in the understated charm of the Santa Monica shoreline as the season shifts.
The weather in Santa Monica 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 Monica and find detailed weather information for every month.
September and January showcase contrasting weather patterns. In September, temperatures range from a mild 14°C (57°F) to a scorching 37°C (100°F), with minimal precipitation, averaging just 2 mm over the entire month and typically experiencing no rainy days. The humidity sits at a comfortable 68%. In stark contrast, January presents much cooler temperatures, with a minimum of 5°C (40°F) and a maximum of 29°C (84°F), accompanied by significantly higher precipitation totaling 68 mm over about four rainy days. Additionally, humidity rises slightly to 74%. For more detailed insights, you can check out Santa Monica weather in January.
September and February present stark contrasts in weather conditions. September typically enjoys warmer temperatures, with minimums around 14°C (57°F), average highs of 22°C (72°F), and peak temperatures reaching up to 37°C (100°F). Rainfall is minimal, with only about 2 mm over the month and no recorded precipitation days, resulting in a relatively dry atmosphere with 68% humidity. In contrast, February experiences cooler temperatures, with a minimum of 4°C (39°F) and an average high of 14°C (57°F), peaking at 28°C (83°F). This month is significantly wetter, receiving 53 mm of precipitation over five days, and features higher humidity levels at 79%. For more details on February weather, you can visit Santa Monica weather in February.
September and March showcase contrasting weather patterns. In September, temperatures can soar, with a minimum of 14°C (57°F) and reaching as high as 37°C (100°F), while remaining relatively dry with just 2 mm of precipitation over the month. Humidity levels are moderate at 68%. In contrast, March presents cooler temperatures, starting from a minimum of 6°C (43°F) to a maximum of 27°C (80°F), and is much wetter, receiving a total of 71 mm of precipitation across 8 days, accompanied by slightly higher humidity at 75%. For more details about March weather conditions, check out Santa Monica weather in March.
When comparing the weather between September and April, there are notable differences in temperature and precipitation. September boasts a higher average temperature of 22°C (72°F), with maximum highs reaching up to 37°C (100°F), making it notably warmer than April, which has an average of 17°C (62°F) and a maximum of 33°C (92°F). Additionally, September experiences minimal precipitation, with only 2 mm (0.1 in) and no rainy days, whereas April sees more rainfall at 15 mm (0.6 in) over two days. Both months share relatively similar humidity levels, with September at 68% and April slightly higher at 70%. For a closer look at April’s weather specifics, check out Santa Monica weather in April.
In September, the weather tends to be significantly warmer than in May, with average temperatures ranging from a minimum of 14°C (57°F) to a maximum of 37°C (100°F). This month boasts a very low precipitation level of only 2 mm (0.1 in) and generally enjoys clear skies, as there are no recorded rainy days. In contrast, May sees cooler temperatures, with a minimum of 10°C (50°F) and a maximum of 31°C (88°F), along with slightly higher precipitation of 10 mm (0.4 in) and one rainy day. Both months have similar humidity levels, around 68% in September and 70% in May. For more detailed insights into May's weather specifics, visit Santa Monica weather in May.
When comparing the weather in September and June, September tends to be a bit warmer overall. In September, temperatures range from a minimum of 14°C (57°F) to a maximum of 37°C (100°F), with an average temperature of 22°C (72°F). The humidity sits at 68%, and the month sees no precipitation. In contrast, June has a slightly cooler temperature range, with a minimum of 13°C (56°F) and a maximum of 33°C (91°F); the average temperature is 20°C (68°F), and the humidity is a touch higher at 72%, also with no rainy days throughout the month. For more detailed insights, you can check out Santa Monica weather in June.
In comparing the weather of September and July, we see that both months experience warm temperatures with July slightly edging out with a maximum of 38°C (101°F) compared to September's 37°C (100°F). The average temperatures remain similar, with both months averaging around 22°C (72°F) to 23°C (73°F). However, September has a slightly lower minimum temperature at 14°C (57°F) compared to July's 16°C (60°F). Both months record minimal precipitation, with just 2 mm (0.1 in) and zero rainy days. Humidity levels are also comparable, with September at 68% and July slightly higher at 73%. For a detailed look at July conditions specifically, you can refer to Santa Monica weather in July.
In comparison to August, September experiences a slightly wider range of temperatures, with minimums of 14°C (57°F) and maximums reaching up to 37°C (100°F). August has a minimum temperature of 16°C (61°F) and peaks at 34°C (93°F). Both months exhibit low precipitation, with September recording just 2 mm (0.1 in) and August only 1 mm (0.0 in), resulting in dry conditions throughout. Humidity levels are quite similar, with September at 68% and August slightly higher at 69%. For more detailed insights about August weather specifics, you can visit Santa Monica weather in August.
In September, the weather is typically warm with an average temperature of 22°C (72°F), peaking at a hot 37°C (100°F), and experiencing very little precipitation with only 2 mm noted across the month. The humidity remains relatively high at 68%. In contrast, October sees a slight dip in temperatures, with an average of 20°C (69°F) and a minimum of 10°C (50°F), while still allowing for peak temperatures to reach up to 37°C (99°F). Additionally, October brings slightly more rainfall, accumulating 7 mm over just one day, with humidity dropping slightly to 67%. For more details, see Santa Monica weather in October.
In September, the weather is typically warm and dry, with temperatures ranging from a minimum of 14°C (57°F) to a scorching maximum of 37°C (100°F) and an average of 22°C (72°F). In contrast, November brings cooler temperatures, with a minimum of 6°C (44°F), an average of 17°C (63°F), and a maximum of 32°C (89°F). While September experiences virtually no rainfall, November sees some precipitation, totaling 17 mm (0.7 in) over just one day, yet maintains similar humidity levels at 68%. For those interested in specific weather patterns, check out the detailed information on Santa Monica weather in November.
In September, the weather is typically warm, with average temperatures reaching around 22°C (72°F) and highs peaking at 37°C (100°F). The month boasts very little precipitation, with only 2 mm recorded and no rainy days, while humidity levels hover around 68%. In contrast, December brings a significant drop in temperatures, with minimums of 5°C (42°F) and an average of 14°C (57°F). The month experiences more moisture, totaling 80 mm of rain over five days, and a slight increase in humidity to 71%. For more details on December weather patterns, please refer to Santa Monica weather in December.
As summer transitions to fall, September in Santa Monica offers a delightful respite from the heat, showcasing a perfect blend of sunshine and mild temperatures. With an average temperature around 22°C (72°F), it stands out from the sweltering peak of summer, while the notably low precipitation—with 0 rainy days—ensures that outdoor activities can be enjoyed uninterrupted. Additionally, the humidity remains manageable, creating an inviting atmosphere for both locals and visitors alike. For a comprehensive look at the weather trends throughout the year, be sure to explore Santa Monica Climate.