September Weather in Redondo Beach, United States

Last updated: February 24, 2025

Experience the vibrant weather of Redondo Beach in September, where the charm of coastal life shines brightly. With maximum temperatures reaching 29°C (85°F) and an average of 20°C (69°F), the month offers a delightful warmth perfect for outdoor activities. Nighttime brings a refreshing drop to a minimum of 16°C (61°F), ensuring comfortable evenings by the ocean. Notably, the region boasts zero precipitation days with a light total rainfall of just 2 mm (0.1 in), allowing you to soak up the sun without interruption. With humidity levels around 68%, September in Redondo Beach is a spectacular blend of summer’s warmth and coastal breezes, inviting both residents and visitors to enjoy its stunning vistas and vibrant atmospheres.

September Temperature in Redondo Beach

September in Redondo Beach offers a delightful transition into autumn, characterized by mild temperatures that beckon beachgoers and outdoor enthusiasts alike. With minimums around 16°C (61°F) and averages hovering at 20°C (69°F), the month provides a comfortable backdrop for leisurely strolls along the shore. The maximum temperatures reaching up to 29°C (85°F) still hold onto the warmth of summer, making it an ideal time to soak up the sun before cooler days arrive. This month continues the trend of gradual warming seen through the summer, marking a gentle winding down of the warmer season while still delivering pleasant conditions for sun and surf lovers.

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

The chart illustrates September temperature patterns in Redondo 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 Redondo 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 Redondo Beach

In September, Redondo Beach experiences a significant shift in its precipitation patterns, with only 2 mm (0.1 in) of rainfall recorded throughout the month, marking a continuation of the dry summer. This minimal amount underscores a trend toward increasingly arid conditions, as rainfall dwindles to an almost non-existent level in the months preceding September, with zero precipitation days noted in both July and August. Following the summer dryness, this slight uptick in rainfall is a reminder of the approaching fall season, but it remains vastly lower than earlier months such as January or December. As the year progresses, the region typically braces for a return to more significant rainfall, but September exemplifies the transition phase that characterizes Southern California’s climate during this time of year.

September Precipitation Trends in Redondo Beach

The chart displays monthly precipitation patterns in Redondo 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 Redondo Beach

As the summer fades, September brings a refreshing drop in humidity to Redondo Beach, with levels at 68%—the lowest point since May. This gradual decline in moisture begins in August and continues into the early fall, indicating a transition to the dryer months ahead. Notably, the trend reflects a shift from the peak summer humidity of 73% in July, highlighting the region's comfortable climate that invites both locals and visitors to enjoy the outdoors. With October looming, expectations for even drier air linger, as humidity typically dips to 67%. This seasonal change not only enhances the beauty of the coastal landscape but also creates an ideal environment for beach activities and afternoon strolls along the shore.

September Average Humidity in Redondo Beach

This chart illustrates the average monthly humidity levels in Redondo 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 Redondo Beach

As summer gracefully transitions into autumn in Redondo Beach, September brings a very high UV Index of 10, maintaining the intensity seen in the peak summer months. With a burn time of just 15 minutes, it's crucial to stay protected while enjoying the sun's warmth. This month mirrors August's rating, indicating that while the days may be getting shorter, the need for sun safety remains vital. As the UV Index begins to decline in October, now is the perfect time to relish outdoor activities, but remember to prioritize protection against those lingering rays. For more detailed information, check out the Redondo Beach UV Index.

Maximum UV Index Levels in Redondo Beach for September

The chart shows the monthly maximum UV Index (UVI) for Redondo 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: Redondo 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 Redondo Beach

As summer gracefully transitions into early autumn, September in Redondo Beach maintains a radiant charm, boasting 315 hours of sunshine. This month continues a vibrant trend observed throughout the summer, where sunlit days reached their peak in July with 379 hours. While there's a slight dip in daylight compared to the sun-kissed months of June and July, September still offers ample warmth and pleasant afternoons, providing a wonderful backdrop for beach lovers and outdoor enthusiasts. As the year progresses, the sunshine gradually wanes, with October following closely at 293 hours, yet the lingering summer vibes ensure that September remains a beloved month for enjoying the coastal ambiance.

Monthly Sunshine Duration in Redondo Beach: September Highlighted

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

Chance of Sun in Redondo Beach During September

As summer transitions into autumn, Redondo Beach enjoys a pleasant 71% likelihood of sunny weather in September. This month stands out as an extension of the warm, sun-kissed days experienced in August, which boasts a 70% chance of sunshine. The trend indicates a steady increase in sunny days from the somewhat cloudy April, which dips to 57%, making September a particularly appealing time for beachgoers and outdoor enthusiasts. As the year progresses, the likelihood of sunny weather remains relatively high, with October maintaining a solid 69% chance of clear skies. This consistent pattern highlights September as a delightful bridge between summer and fall, ideal for soaking up the sun before the cooler months arrive.

Percentage of Sunny Days in September in Redondo Beach

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

Daylight Hours in Redondo Beach in September

As summer gracefully transitions into autumn, September in Redondo Beach offers a delightful balance of sunshine, featuring around 12 hours of daylight. This month marks a subtle decline from the 14 hours enjoyed during the peak of summer in July and June, gradually giving way to shorter days ahead. While October will further reduce daylight to 11 hours, September stands out as a pleasant reminder of the longer, sun-drenched days that precede the cozy embrace of fall. The trend reveals a fascinating ebb and flow of daylight throughout the year, inviting residents and visitors alike to savor the warm, golden hours before the shorter days of winter settle in.

Average Daylight Hours in Redondo Beach for September

The chart illustrates the variation in daylight duration in Redondo 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: Redondo Beach daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Redondo Beach

As summer gracefully fades into autumn, September in Redondo Beach experiences a gentle decline in wind speed, averaging 3.1 m/s (7 mph). This marks the end of the breezy heights of summer, where winds hovered around 3.2 m/s in July and August. The transition to fall brings a slight whisper of change, echoing the overall trend of decreasing wind speeds that begins to emerge as the year progresses. While September's breezes may feel softer, they still carry the warmth of summer's lingering touch, preparing the landscape for the more subdued winds of October and November, where speeds dip further to 3.2 m/s and 2.7 m/s, respectively. The shifting winds remind us that nature is always in flux, inviting residents and visitors to enjoy those tranquil early autumn days by the beach.

Average September Wind Speed in Redondo Beach

The chart displays monthly wind speed patterns in Redondo 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: Redondo Beach September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Redondo Beach Compares to Other Months

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

September offers a warm and pleasant climate, with average temperatures ranging around 20°C (69°F) and maximums reaching up to 29°C (85°F). This month typically sees minimal precipitation, averaging only 2 mm (0.1 in) and experiencing no rainy days, while humidity is moderately high at 68%. In stark contrast, January brings cooler conditions, with average temperatures around 14°C (58°F) and maximums of 25°C (77°F). This winter month is characterized by significantly higher precipitation, totaling 58 mm (2.3 in) over four rainy days, and a slightly elevated humidity level of 74%. For more detailed information, check out the upcoming conditions listed in Redondo Beach weather in January.

When comparing the weather in September and February, there are notable differences in temperature, precipitation, and humidity. September offers warmer days with a minimum temperature of 16°C (61°F) and an average of 20°C (69°F), peaking at 29°C (85°F). This month is characterized by very little rainfall, with only 2 mm (0.1 in) recorded over no rainy days and a humidity level of 68%. In contrast, February experiences cooler temperatures, with a minimum of 7°C (45°F) and an average of 14°C (57°F), reaching a maximum of 26°C (78°F). This month is significantly wetter, with 46 mm (1.8 in) of precipitation spread over four rainy days and a higher humidity of 79%. For more detailed information, you can check the Redondo Beach weather in February.

In comparing the weather of September and March, September boasts milder temperatures, with averages ranging from a minimum of 16°C (61°F) to a maximum of 29°C (85°F). It typically experiences dry conditions, with negligible precipitation of just 2 mm (0.1 in) and an average humidity of 68%. In contrast, March presents cooler temperatures, averaging between 9°C (48°F) and 22°C (72°F), and is considerably wetter, with precipitation amounting to 53 mm (2.1 in) over about six days. The humidity in March is slightly higher at 75%, adding to the overall contrast between the two months. For more detailed information, you can check Redondo Beach weather in March.

In comparing the weather of September and April, we see notable differences in temperature and precipitation. September enjoys warmer temperatures, with an average of 20°C (69°F) and a maximum of 29°C (85°F), while April has a cooler average of 15°C (60°F). However, April experiences more precipitation, with 14 mm (0.6 in) over two days, contrasting sharply with September's dry days and minimal rainfall of just 2 mm (0.1 in). Additionally, humidity levels are slightly higher in both months, with April at 70% and September at 68%. For those interested in more details, you can check out Redondo Beach weather in April.

September generally offers warmer temperatures compared to May, with average highs reaching up to 29°C (85°F) versus May's average maximum of 24°C (75°F). The minimum temperature in September is also notably higher, starting at 16°C (61°F) compared to May's 11°C (53°F). While September boasts very little precipitation with only 2 mm and no rainy days, May experiences slightly more rain at 8 mm and one rainy day. Both months maintain a similar level of humidity, at 68% for September and 70% for May, creating a comfortable atmosphere. For a closer look at what to expect, you can check out Redondo Beach weather in May.

In comparing the weather of September to June, September tends to be slightly warmer, with average temperatures reaching 20°C (69°F) compared to June's average of 18°C (64°F). While both months experience minimal precipitation, September boasts a maximum temperature of 29°C (85°F) against June's peak of 28°C (82°F). Humidity levels are relatively close, with September at 68% and June slightly higher at 72%. For more detailed information, you can check Redondo Beach weather in June.

September and July exhibit striking similarities in weather, with both months showcasing a minimum temperature of 16°C (61°F) and a maximum of 29°C (85°F). The average temperatures are also closely aligned, with September averaging 20°C (69°F) and July at 20°C (68°F). Precipitation levels in both months are minimal, with only 2 mm (0.1 in) recorded and no rainy days in either month. However, September experiences slightly lower humidity at 68%, compared to July's 73%, making September a touch more comfortable. For a closer look at July weather details, you can check Redondo Beach weather in July.

In September, the weather shows a slight warming trend compared to August, with average temperatures decreasing from 21°C (69°F) to 20°C (68°F). Notably, September experiences a higher maximum temperature of 29°C (85°F) compared to August's 26°C (80°F). Both months share similar low temperatures, with September maintaining the minimum at 16°C (61°F). Precipitation levels remain minimal in both months, with September recording just 2 mm and no rainy days, while August has even less at 1 mm with no precipitation days. Humidity sees a slight dip in September to 68%, down from August's 69%. For more details, you can check Redondo Beach weather in August.

In September, the weather is characterized by mild temperatures, with a minimum of 16°C (61°F) and an average of 20°C (69°F), peaking at a maximum of 29°C (85°F). This month enjoys almost no precipitation, with just 2 mm (0.1 in) recorded over zero days, and humidity levels around 68%.

By October, the temperature range shifts slightly, featuring a minimum of 13°C (56°F) and an average of 19°C (67°F), with maximum temperatures reaching up to 33°C (91°F). Precipitation increases to 6 mm (0.3 in) over one rainy day, and humidity dips slightly to 67%. For more detailed information, you can visit Redondo Beach weather in October.

In September, the weather typically boasts warm temperatures with a minimum of 16°C (61°F) and an average of 20°C (69°F), peaking at 29°C (85°F). This month enjoys minimal rainfall, with only 2 mm (0.1 in) and no rain days, creating a pleasant and dry environment with a humidity level of 68%. In contrast, November brings cooler conditions, with temperatures dropping to a minimum of 10°C (50°F) and an average of 17°C (63°F), while still reaching the same maximum of 29°C (85°F). However, November experiences a significant increase in precipitation, totaling 17 mm (0.7 in) over 2 days, while humidity remains constant at 68%. For a more detailed look at what to expect, check out Redondo Beach weather in November.

In September, the weather is generally warm, with temperatures ranging from a minimum of 16°C (61°F) to a maximum of 29°C (85°F), and an average of 20°C (69°F). This month is quite dry, with only 2 mm of precipitation recorded over zero days, and humidity levels are around 68%.

In contrast, December sees cooler temperatures, with a minimum of 9°C (49°F) and a maximum of 24°C (75°F), leading to an average temperature of 15°C (58°F). The month experiences significantly more rainfall, totaling 74 mm (2.9 in) over four days, and the humidity slightly increases to 71%. For a detailed look at December weather in Redondo Beach, you can visit Redondo Beach weather in December.

Compare Redondo Beach's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Redondo Beach

As summer transitions into fall, September in Redondo Beach presents a delightful mix of warm temperatures and low precipitation, making it distinctly drier compared to the months preceding it. With an inviting average of around 20°C (69°F), this month is perfect for outdoor activities and beach outings without the worries of unexpected rain, as it boasts zero precipitation days. The humidity hovers at a comfortable 68%, contributing to the overall pleasantness of the weather. If you're curious about how this weather compares to other times of the year, you can explore more in-depth insights at Redondo Beach Climate.