Last updated: February 24, 2025
In September, Isla Vista showcases a delightful range of temperatures, with a maximum hitting a sizzling 36°C (97°F) and a comfortable average around 21°C (70°F). The thermometers dip to a cool minimum of 9°C (48°F), offering refreshing evenings. Remarkably, the month sees negligible precipitation at just 2 mm (0.1 in) across no rainy days, highlighting its dry and pleasant climate. With humidity levels sitting at a moderate 48%, September in Isla Vista is the perfect backdrop for outdoor adventures and sun-soaked relaxation.
In September, Isla Vista experiences a delightful interplay of summer warmth and early autumn coolness. With minimum temperatures dipping to around 9°C (48°F) and averaging 21°C (70°F), the month retains a pleasant balance before transitioning into fall. The maximum temperature can soar up to 36°C (97°F), mirroring the peaks of July and August, making for occasional sweltering days. This month stands out as a bridge between the intense heat of summer and the cooler, milder fall, allowing residents and visitors to enjoy both warm afternoons and refreshing evenings. Overall, September showcases Isla Vista’s climate versatility, inviting outdoor activities and vibrant gatherings under the sun.
In Isla Vista, September marks yet another dry month, with just 2 mm (0.1 in) of precipitation recorded, consistent with the patterns of the prior two months. The region experiences a notable reduction in rainfall, a continuation from the summer season where both July and August saw no precipitation days at all. This trend indicates a significant dry spell typical for the late summer and early fall months, contributing to the overall lower annual precipitation totals. With zero reported precipitation days in September, the landscape remains parched, setting the stage for the gradual return of more significant rainfall as the year transitions into October and beyond.
As summer fades in Isla Vista, September brings a noticeable shift in humidity, rising to 48% after the drier months of July and August. This uptick marks a transition from the low humidity levels typically experienced over the summer, which dipped to just 39% in August, the driest month. The gradual increase in humidity signals the impending arrival of autumn, as the air becomes a bit more moist and invigorating. Looking further ahead, October sees an increase to 59%, setting the stage for a trend of rising humidity through the fall months, eventually peaking again in the winter. This natural fluctuation highlights the coastal environment's moderate yet dynamic climate, where seasonal changes are felt vividly.
In September, Isla Vista experiences a UV Index of 10, placing it in the very high exposure category, with a burn time of just 15 minutes for unprotected skin. This marks a slight decrease from the extreme levels seen in the summer months, yet it's still vital to take precautions, such as applying sunscreen and wearing protective clothing. The trend observed throughout the months highlights a consistent pattern of increasing UV exposure from January through August, peaking in July at 12, before the gradual decline starting in September. As autumn approaches, the UV Index drops to 7 in October but remains a notable consideration for those enjoying the sunny California coast. For further details on UV exposure and recommendations, visit Isla Vista UV Index.
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As the year progresses, September shines brightly in Isla Vista with 317 hours of sunshine, marking a delightful transition from the sun-drenched summer months. Following a peak in July with a remarkable 383 hours, the sunshine begins to wane slightly, but September still offers a generous glow that invites outdoor activities and beach outings. The month transitions elegantly from the sweltering heat of August and sets the stage for a gradual decline into autumn as October brings 295 hours of sunlight. Overall, the trend shows that from the beginning of the year, where sunshine starts at 186 hours in January, Isla Vista experiences a steady increase, peaking in mid-summer and tapering off gracefully as the seasons change. The vibrant September sun is a reminder of summer's lingering warmth before the cooler months embrace the shoreline.
As September rolls in, Isla Vista basks in one of its sunniest months, boasting an impressive 86% chance of sunny weather. This trend of bright skies follows a summer of consistent sunshine, with July and August experiencing 81% and 84% chances, respectively. Notably, this rise from summer culminates in September, making it an ideal time for outdoor activities and enjoying the beach. As the season transitions into fall, the likelihood of sunny days begins to dip, with October returning to a more modest 73%. Thus, September stands out not just for its warmth but also for its exceptional clarity, inviting both locals and visitors alike to soak in the last rays of summer.
As September arrives in Isla Vista, the days gradually shorten, with an average of 12 hours of daylight illuminating the landscape. This month marks a transition, following July and June's peak of 14 hours, which basked the community in ample sunlight. As summer wanes, September retains a hint of warmth, with slightly more daylight than October’s expected 11 hours. This gradual decrease signals the onset of autumn, where daylight slowly gives way to cozy evenings, reminding residents that the natural cycle of the seasons is in full swing. Overall, September stands as a bridge between the lively long days of summer and the shorter, quieter periods of fall.
As summer fades into autumn, September in Isla Vista brings with it the calmest winds of the year, averaging just 2.2 m/s (5 mph). This marks a distinct dip from the breezier months of spring and early summer, where average wind speeds hovered between 3.1 to 3.6 m/s (7 to 8 mph). The trend reveals a gradual decline from the lively winds of April, which often invigorate coastal activities, to the mellow breezes of September, creating a tranquil atmosphere ideal for relaxation. As the year progresses, wind speeds tend to slightly rebound in October, but September stands out as a month where the gentle whispers of the wind invite moments of calm reflection along the beautiful shoreline.
The weather in Isla Vista 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 Isla Vista and find detailed weather information for every month.
September typically boasts warm temperatures, with averages around 21°C (70°F) and highs reaching up to 36°C (97°F). This month is characterized by minimal precipitation, often with dry conditions and a humidity level of 48%. In contrast, January presents a much cooler climate, with average temperatures around 12°C (54°F) and maximums peaking at 27°C (81°F). This winter month experiences significant rainfall, recording about 93 mm (3.7 in) over six days, resulting in a much higher humidity level of 78%. For a detailed look at January weather, you can visit Isla Vista weather in January.
September and February showcase strikingly different weather patterns. September enjoys warm temperatures, with a minimum of 9°C (48°F) and an average of 21°C (70°F), peaking at a sweltering 36°C (97°F). The month is relatively dry, featuring only 2 mm (0.1 in) of precipitation and an average humidity of 48%. In contrast, February is much cooler, with temperatures dipping to a minimum of 2°C (36°F) and averaging only 12°C (53°F), while the maximum reaches 25°C (78°F). This month experiences significantly more rainfall, with 81 mm (3.2 in) over six days and much higher humidity at 82%. For more detailed insights into February weather, you can refer to Isla Vista weather in February.
In September, the weather is generally warm, with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 36°C (97°F) and an average of 21°C (70°F). The month boasts minimal precipitation, totaling only 2 mm (0.1 in) over zero rainy days, resulting in a relatively dry climate with a humidity level of 48%. In contrast, March experiences cooler temperatures, with a minimum of 3°C (37°F) and a maximum of 25°C (77°F), averaging 12°C (55°F). This month is notably wetter, with 88 mm (3.5 in) of precipitation spread across nine days, leading to a higher humidity of 75%. For a detailed overview of weather patterns in March, you can check Isla Vista weather in March.
When comparing the weather in September and April, September stands out with generally warmer temperatures, averaging 21°C (70°F) and peaking at a maximum of 36°C (97°F), while April offers milder weather with an average of 15°C (60°F) and a maximum of 30°C (86°F). In terms of precipitation, September is quite dry with only 2 mm and no rain days, whereas April sees significantly more rain at 21 mm over two days. Additionally, humidity is lower in September at 48% compared to a higher 68% in April, contributing to a different overall atmosphere for each month. For more detailed information, you can check out Isla Vista weather in April.
September generally boasts warmer temperatures compared to May, with average highs reaching 21°C (70°F) and occasional peaks of 36°C (97°F). In contrast, May sees a milder maximum temperature of 29°C (85°F) and an average of 16°C (62°F). While both months experience relatively low precipitation, September is remarkably drier with no recorded rainfall, whereas May has about 12 mm (0.5 in) over two days. Additionally, humidity levels are slightly higher in May at 57%, compared to 48% in September. For a more detailed look at the weather in May, check out Isla Vista weather in May.
Comparing the weather in September and June reveals notable differences. September boasts a wider temperature range, with minimums as low as 9°C (48°F) and maximums reaching up to 36°C (97°F), resulting in an average of 21°C (70°F). In contrast, June has slightly milder temperatures, with a minimum of 10°C (51°F) and a maximum of 33°C (91°F), averaging around 19°C (67°F). While September experiences almost no precipitation with just 2 mm and 0 days of rain, June sees a bit more moisture with 4 mm and 1 rainy day. Additionally, humidity levels are marginally lower in September at 48% compared to 52% in June. For more specific details about June weather, you can refer to Isla Vista weather in June.
In comparing the weather of September to that of July, September offers slightly cooler temperatures, with a minimum of 9°C (48°F) compared to July's minimum of 14°C (57°F). Both months reach a maximum of 36°C (97°F), but September has an average temperature of 21°C (70°F), which is very close to July's average of 22°C (72°F). Interestingly, both months report negligible precipitation, with just 2 mm (0.1 in) and no rainy days. Humidity levels are relatively similar, with September at 48% and July slightly lower at 46%. For a closer look at July's weather specifics, visit Isla Vista weather in July.
September experiences a wider temperature range compared to August, with minimum temperatures dropping to 9°C (48°F) and maximum temperatures reaching up to 36°C (97°F), while August maintains a milder range between 14°C (58°F) and 33°C (92°F). Despite both months reporting negligible precipitation of 2 mm (0.1 in) and 0 rainy days, September boasts slightly higher average temperatures at 21°C (70°F) compared to August's 22°C (72°F). Additionally, September's humidity level is higher at 48% compared to August's 39%, contributing to a more sultry atmosphere as summer transitions into fall. For a detailed overview of September’s weather, check out Isla Vista weather in August.
In September, the weather typically features a wider temperature range, with minimums around 9°C (48°F) and maximums reaching up to 36°C (97°F), while maintaining a comfortable average of 21°C (70°F) and low precipitation at just 2 mm (0.1 in). In contrast, October sees a slight dip in temperatures, with minimums around 7°C (45°F) and maximums peaking at 33°C (92°F), leading to a cooler average of 18°C (65°F). Additionally, October experiences a higher humidity level of 59% compared to September's 48%, along with increased precipitation of 10 mm (0.4 in) over the month. For more detailed information, visit Isla Vista weather in October.
September typically offers warmer weather compared to November, with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 36°C (97°F) and an average of 21°C (70°F). The month is generally dry, featuring minimal precipitation of just 2 mm (0.1 in) over no rainy days and a comfortable humidity level of 48%.
In contrast, November sees a significant drop in temperature, with a minimum of 3°C (38°F), an average of 15°C (60°F), and a maximum of 28°C (83°F). This month is wetter, accumulating 23 mm (0.9 in) of rainfall over approximately one rainy day, and exhibits higher humidity at 72%. For more detailed insights, you can check Isla Vista weather in November.
In comparing the weather patterns of September and December, a marked shift is evident. September boasts warmer temperatures with a minimum of 9°C (48°F) and an average high of 36°C (97°F), accompanied by minimal precipitation at just 2 mm (0.1 in) and no rainy days. In contrast, December experiences cooler conditions, with temperatures ranging from a minimum of 3°C (38°F) to an average of 12°C (54°F), and a notable increase in precipitation to 62 mm (2.5 in) over 6 days. Additionally, humidity levels rise significantly in December to 76%, compared to September's more comfortable 48%. For more detailed insights, you can check Isla Vista weather in December.
As September unfolds in Isla Vista, the weather takes on a unique character compared to other months. With an impressive maximum temperature that can reach up to 36°C (97°F), it showcases the remaining warmth of summer, yet it balances with an average comfortable 21°C (70°F). Notably, this month also enjoys a dryness rarely found in the preceding summer months, as evidenced by the scant 2 mm of precipitation and no rain days at all. Combined with a moderate 48% humidity, September becomes a perfect time to bask in the sun and enjoy the outdoors. To learn more about the broader climate trends in Isla Vista, visit Isla Vista Climate.