September Weather in Hermosa Beach, United States

Last updated: February 24, 2025

In September, Hermosa Beach experiences a delightful coastal climate marked by a maximum temperature of 29°C (85°F) and a comfortable average of 20°C (69°F). Residents and visitors enjoy clear skies and abundant sunshine, with a minimum temperature of 16°C (61°F) ensuring pleasant evenings. Notably, the month records a mere 2 mm (0.1 in) of precipitation, spread across zero rainy days, creating ideal conditions for outdoor activities. With humidity levels at 68%, the ocean breeze keeps the environment refreshing, making September a perfect time to explore this beautiful beach destination.

September Temperature in Hermosa Beach

In September, Hermosa Beach experiences a pleasant transition towards the end of summer, with temperatures that invite both beach lounging and evening strolls. The minimum temperature hovers around 16°C (61°F), providing a warm start to the day, while the average reaches a comfortable 20°C (69°F), perfect for outdoor activities. The maximum temperature can rise up to 29°C (85°F), reminiscent of the earlier summer months but balanced by the cooler ocean breeze. This month reflects a notable trend of warmth, sustaining the inviting climate just before autumn sets in, making it an ideal time for visitors to soak in the last bits of summer sun.

September Weather in Hermosa Beach: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Hermosa Beach, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec575758606164686968676358
Data source: Temperature data for Hermosa Beach 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 Hermosa Beach

In September, Hermosa Beach experiences a remarkable shift in precipitation patterns, recording only 2 mm (0.1 inches) of rain, which reflects an overall trend of diminishing rainfall as summer transitions to fall. This month stands out, not just for its minimal rainfall, but for being entirely dry with 0 days of recorded precipitation—an indication of the usually sunny and pleasant weather typical for the region. Following the wetter months of January through March, where an average of 52 mm (2.0 in) of rain fell over several days, September’s meager totals emphasize the dry spell that characterizes the late summer season in this coastal paradise. As the year progresses, precipitation begins to tick upwards again in October and November, but for now, September remains a sun-soaked respite, setting a perfect backdrop for beachgoers and outdoor activities.

September Precipitation Trends in Hermosa Beach

The chart displays monthly precipitation patterns in Hermosa Beach, 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.
JanFebMarAprMayJunJulAugSepOctNovDec584653148121261774
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hermosa Beach

As September rolls in, Hermosa Beach experiences a noticeable dip in humidity, settling at 68%—a consistent decline from the summer months. This marks a trend as the humidity gradually decreases from its peak in February and hovers between 69% and 79% during the earlier months of the year. With the arrival of fall, the coastal air becomes crisper, providing a refreshing contrast to the humidity of the preceding summer. Interestingly, the trend continues into October, where humidity further decreases to 67%, suggesting that the region is transitioning into a drier atmosphere. Overall, September serves as a bridge, gently easing residents from the humid warmth of summer into the more comfortable, drier fall days ahead.

September Average Humidity in Hermosa Beach

This chart illustrates the average monthly humidity levels in Hermosa Beach, 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.
JanFebMarAprMayJunJulAugSepOctNovDec74%79%75%71%70%72%73%69%68%67%68%71%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hermosa Beach

As September rolls in at Hermosa Beach, the UV Index remains high, consistently landing at 10, which indicates a very high exposure category. This trend follows the peak summer months, where the UV Index reached its highest points, notably 11 in July and June. With burn times reduced to 15 minutes, sun safety becomes paramount, echoing the preceding months of intense sun exposure. As the days begin to shorten and autumn approaches, the UV Index starts its gradual decline, yet September still calls for vigilance under the sun. Stay informed and protect your skin as you enjoy the beautiful beach days. For more details, check out the Hermosa Beach UV Index.

Maximum UV Index Levels in Hermosa Beach for September

The chart shows the monthly maximum UV Index (UVI) for Hermosa Beach 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.
JanFebMarAprMayJunJulAugSepOctNovDec46891011111010754
Data source: Hermosa Beach 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 Hermosa Beach

As summer gracefully transitions into fall, September in Hermosa Beach remains a radiant affair, with 315 hours of sunshine lighting up the days. This month marks a slight dip from the peak summer brilliance of July and August, where sunny hours peaked at 379 and 359 hours, respectively. However, September still boasts a robust amount of sunshine, outshining the earlier months of the year. The increasing daylight from the winter months, which see only 191 hours in January and 228 hours in December, emphasizes the lingering warmth of early autumn. As the days gradually shorten, the rich golden sunsets by the ocean continue to enchant residents and visitors alike, creating a perfect backdrop for beach activities and gatherings.

Monthly Sunshine Duration in Hermosa Beach: September Highlighted

The September sunshine duration represents the total number of hours Hermosa Beach 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.
JanFebMarAprMayJunJulAugSepOctNovDec191h233h290h318h347h362h379h359h315h293h256h228h
Data source: Hermosa Beach September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Hermosa Beach During September

As summer transitions into fall, September in Hermosa Beach offers a promising 71% chance of sunny weather, making it one of the sunniest months of the year. This slight uptick from August's 70% reflects a consistent trend of increased sunshine as the days gradually shorten. In fact, the sunshine likelihood begins to rise from the early winter months, peaking in the vibrant spring and summer, before settling into a pleasantly warm September. With this favorable weather, visitors and locals alike can enjoy the beach and outdoor activities, taking advantage of the area's stunning coastal scenery before the autumn chill begins to set in.

Percentage of Sunny Days in September in Hermosa Beach

The chart illustrates the percentage of sunny days in Hermosa Beach 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 Hermosa Beach experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec64%67%74%57%49%57%62%70%71%69%63%51%
Data source: Hermosa Beach September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Hermosa Beach in September

As September rolls into Hermosa Beach, the length of daylight begins a gentle decline, offering about 12 hours of sunlight each day. Following the high of 14 hours seen during the summer months of June and July, this transition signifies the onset of autumn, where lingering beach days are still enjoyed but are noticeably shorter. This month stands as a bridge from the vibrant high summer days to the cozier fall evenings, with daylight gradually tapering off as it prepares for the shorter days ahead in October and November. The gradual ebb of daylight throughout the year highlights the natural rhythm of the seasons, while maintaining the charming allure of coastal life.

Average Daylight Hours in Hermosa Beach for September

The chart illustrates the variation in daylight duration in Hermosa Beach throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 11m10h 58m11h 59m13h 2m13h 55m14h 20m14h 6m13h 19m12h 19m11h 17m10h 23m9h 56m
Data source: Hermosa Beach daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Hermosa Beach

As summer fades into autumn, September in Hermosa Beach brings a gentle shift in the breeze, with average wind speeds dipping to 3.1 m/s (7 mph). This marks a notable decline from the more robust winds of earlier months, illustrating a calming trend as the year progresses. While the spring and early summer months flirt with higher averages around 4.0 m/s (9 mph), September's lighter gusts indicate a transition towards cooler weather. As the ocean currents shift and the days grow shorter, this month heralds a serene yet refreshing atmosphere, perfect for leisurely beach strolls and sunset gazing along the iconic shoreline.

Average September Wind Speed in Hermosa Beach

The chart displays monthly wind speed patterns in Hermosa Beach, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.53.44.03.63.43.53.23.23.1 m/s3.22.73.6
Data source: Hermosa Beach September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Hermosa Beach Compares to Other Months

The weather in Hermosa Beach 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 Hermosa Beach and find detailed weather information for every month.

September weather features a warm and inviting climate, with average temperatures ranging from a minimum of 16°C (61°F) to a maximum of 29°C (85°F) and very little precipitation, making it a dry month with 0 days of rain. In contrast, January presents a cooler atmosphere, with average temperatures between 8°C (47°F) and 25°C (77°F), and a notable increase in precipitation, totaling 58 mm (2.3 in) over 4 rainy days. Additionally, January's humidity is slightly higher at 74%, compared to September's 68%. For a closer look at January's conditions, you can check out Hermosa Beach weather in January.

September and February present stark contrasts in weather conditions. In September, temperatures are generally warmer, with minimums around 16°C (61°F) and maximums reaching up to 29°C (85°F). The month experiences minimal precipitation, averaging only 2 mm and no rainy days, alongside a comfortable humidity level of 68%. In contrast, February is noticeably cooler, with temperatures ranging from a low of 7°C (45°F) to a high of 26°C (78°F). This month is also wetter, bringing about 46 mm of precipitation over four days, accompanied by slightly higher humidity at 79%. For more details about February weather specifics, you can refer to Hermosa Beach weather in February.

In September, Hermosa Beach experiences warmer temperatures, with a minimum of 16°C (61°F) and a maximum reaching up to 29°C (85°F), creating a comfortable average of 20°C (69°F). The month is characterized by very little precipitation, with just 2 mm (0.1 in) recorded and no rainy days, alongside a humidity level of 68%. In contrast, March sees cooler temperatures, with a minimum of 9°C (48°F) and a maximum of 22°C (72°F), leading to a lower average of 14°C (58°F). This month is much wetter, receiving 53 mm (2.1 in) of precipitation over approximately six days, and the humidity rises slightly to 75%. For more detailed insights, check out Hermosa Beach weather in March.

In comparing the weather of September and April, one can note distinct differences in temperature and precipitation. September enjoys warmer average temperatures, ranging from a minimum of 16°C (61°F) to a pleasant maximum of 29°C (85°F), with very little precipitation and humidity at 68%. In contrast, April experiences cooler weather with temperatures ranging from a minimum of 11°C (52°F) to a peak of 30°C (86°F), but it receives more rainfall, totaling 14 mm (0.6 in) over two days, and has a slightly higher humidity level of 70%. For more details on April’s weather, check out Hermosa Beach weather in April.

In September, the weather tends to be warmer compared to May, with average temperatures ranging from a mild 20°C (69°F) to a max of 29°C (85°F), while May sees cooler averages of 16°C (61°F) peaking at 24°C (75°F). September also experiences significantly less precipitation, with just 2 mm (0.1 in) and no rainy days, in contrast to May's 8 mm (0.3 in) of rainfall on one day. Humidity levels remain relatively similar, with September at 68% and May slightly higher at 70%, but overall, September offers a more summery climate. For more detailed weather insights, check out Hermosa Beach weather in May.

September weather tends to be slightly warmer than June, with average temperatures reaching 20°C (69°F) compared to June’s 18°C (64°F). Although both months experience minimal precipitation, September records a slightly higher maximum temperature of 29°C (85°F) against June’s 28°C (82°F). Humidity levels are similar, with September at 68% and June at 72%, providing a comfortable atmosphere overall. For more detailed insights, you can check out Hermosa Beach weather in June.

When comparing the weather in September to that of July, we find that both months enjoy similar temperature ranges, with minimums around 16°C (61°F), averages of 20°C (68-69°F), and maximums reaching up to 29°C (85°F). Both months also experience minimal rainfall, recording just 2 mm (0.1 in) with no precipitation days. However, September boasts slightly lower humidity at 68% compared to July’s 73%. This makes September feel a bit drier and more comfortable, while July tends to be more humid. For more information on July weather specifics, you can refer to Hermosa Beach weather in July.

In comparing the weather between September and August, both months exhibit mild temperatures, though September tends to be slightly warmer. September has a minimum temperature of 16°C (61°F) and an average of 20°C (69°F), while August’s minimum is also 16°C (62°F), but with a higher average of 21°C (69°F). The maximum temperatures reveal a more noticeable difference, with September reaching up to 29°C (85°F) compared to August's 26°C (80°F). Precipitation levels in both months are quite low, with September recording only 2 mm (0.1 in) and August at 1 mm (0.0 in), and neither month experiencing any rain days. Humidity remains relatively stable, with September at 68% and August at 69%. For more detailed insights, check out Hermosa Beach weather in August.

September and October present a noticeable transition in weather patterns. In September, temperatures range from a minimum of 16°C (61°F) to a maximum of 29°C (85°F), with an average of 20°C (69°F) and hardly any rainfall, maintaining a humidity level of 68%. By contrast, October experiences a slight drop in the minimum temperature to 13°C (56°F) and an average of 19°C (67°F), although it can still peak at a higher maximum of 33°C (91°F). Precipitation increases in October to 6 mm (0.3 in), with a day of rain likely, while humidity remains steady at 67%. For more details on October's weather, you can check out Hermosa Beach weather in October.

September typically offers warmer and drier conditions, with average temperatures around 20°C (69°F) and virtually no precipitation. In contrast, November experiences a noticeable drop in temperature, averaging 17°C (63°F), with increased humidity and a higher chance of rain, receiving about 17 mm over two days. Although November can be cooler, it still shares the same maximum temperature of 29°C (85°F) as September. For more detailed insights into the weather during this month, check Hermosa Beach weather in November.

In September, the weather is generally warm and pleasant, with average temperatures around 20°C (69°F) and a maximum of 29°C (85°F). The month experiences very little rainfall, with just 2 mm and no rainy days, contributing to a comfortable humidity level of 68%. In contrast, December brings cooler temperatures, with averages dropping to 15°C (58°F) and a maximum of 24°C (75°F). This month sees a significant increase in precipitation, totaling 74 mm over four days, leading to a slightly higher humidity of 71%. For more detailed information on December weather, visit Hermosa Beach weather in December.

Compare Hermosa Beach's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Hermosa Beach

As summer transitions into autumn, September in Hermosa Beach offers a delightful escape with pleasantly warm temperatures and minimal precipitation, showcasing a stark contrast to the wetter months that precede it. With average highs around 20°C (69°F) and no significant rain, residents and visitors alike can bask in the sun-drenched shores. The comfortable humidity levels contribute to an enjoyable outdoor atmosphere perfect for beach activities or leisurely strolls along the coastline. For those seeking a detailed overview of what to expect throughout the year, check out the Hermosa Beach Climate page for more insights.