Last updated: February 24, 2025
October in Half Moon Bay, United States offers a delightful blend of mild temperatures and refreshing coastal breezes. With maximums reaching up to 27°C (80°F) and average temperatures around a comfortable 15°C (60°F), the weather is ideal for outdoor activities. Nights cool down to a minimum of 9°C (49°F), perfect for cozy evenings. Although October sees about 27 mm (1.1 in) of rainfall over just two days, the high humidity level of 80% keeps the atmosphere invigorating. Whether you're strolling along the beach or exploring local attractions, October proves to be a charming time to experience the beauty of this coastal gem.
In October, Half Moon Bay offers a delightful mix of mild temperatures, making it a perfect fall escape. With minimums around 9°C (49°F) and maximums reaching up to 27°C (80°F), the climate remains pleasantly warm, especially when compared to the cooler months that precede it. As autumn unfolds, you can expect an average temperature of 15°C (60°F), reflecting a gradual transition from the summer heat of September. This month's temperatures are notably more moderate than the scorching highs seen earlier in the season, inviting visitors to enjoy outdoor activities amidst the beautiful fall scenery. Overall, October presents a harmonious balance of warmth and crispness, characteristic of the season's charm in this coastal town.
In October, Half Moon Bay experiences a noteworthy transition as it welcomes the onset of the wetter season. With an average precipitation of 27 mm (1.1 in) over just 2 days, the rainfall begins to pick up compared to the preceding arid months of summer. This marks a gentle increase from the dry spell of July to September, where scarcely any rain fell. As the region gears up for November's average of 48 mm (1.9 in), October’s limited precipitation hints at nature's shift, foreshadowing the more substantial downpours to come in the following months. This gradual buildup not only nourishes the landscape but also encapsulates the essence of the season in this picturesque coastal town.
In October, Half Moon Bay experiences a noticeable shift in humidity, with levels averaging around 80%. This marks a slight decrease from the more humid summer months, where July and August peak at 87%. As autumn settles in, the air becomes crisper, contributing to a more comfortable atmosphere compared to the sticky heat of summer. October’s humidity aligns closely with the drier conditions of November and December, which hover around 79%. Overall, this gradual decline highlights the transition from the warm, humid summer months to the cooler and more refreshing fall season, making October a delightful time to enjoy the coastal scenery.
In October, Half Moon Bay experiences a UV Index of 7, placing it in the high exposure category, with a burn time of approximately 25 minutes. This month reflects a decline from the intense summer months, where indices peaked at 11, indicating extreme exposure levels in June and July. As autumn settles in, the decreasing UV levels suggest a shift in outdoor activity norms, though caution is still warranted. Notably, the UV Index in October remains higher than the winter months, which see readings drop to moderate levels. To stay informed on UV trends and ensure safe sun exposure, visit Half Moon Bay UV Index.
UV Risk Categories
October in Half Moon Bay radiates with about 276 hours of sunshine, making it the perfect time to enjoy the stunning coastal scenery. As the year progresses, the amount of sunshine typically peaks in June, with a remarkable 355 hours of brilliant rays, before starting a gradual decline through the late summer and fall. Interestingly, while October sees fewer sunlit hours compared to the summer months, it still boasts a generous amount of sunshine relative to late autumn, when the skies begin to cloud over. This decrease in sunlight is part of a natural trend that leads into the cooler months of November and December, where the hours drop to 225 and 194, respectively. Embrace October's golden days, as it presents a delightful balance of warmth and beauty before the winter chill sets in.
In Half Moon Bay, October presents a 50% chance of sunny weather, signifying a balanced transition from the warmer summer months. This percentage is a slight increase compared to the sunniest months preceding it, such as September, which boasts a 47% chance. Following the summer’s low of 30% in July, the trend shows a resurgence in sunshine with increasing percentages from late summer into autumn. Notably, as the year progresses, the likelihood of clear skies fluctuates, but October stands out as a pivotal point where the chance of sun stabilizes, offering residents and visitors a lovely opportunity to enjoy the coastal beauty before the colder months set in.
In October, Half Moon Bay enjoys around 11 hours of daylight, marking a gentle transition as the days begin to wane towards winter. Following the peak of daylight in the summer months, where residents basked in a generous 14 hours from June through July, October signals a gradual decline. This trend reflects the shift from the vibrant energy of longer days in spring and summer to a more subdued ambiance in the fall. As September offered slightly more light with 12 hours, October's daylight diminishes, inviting shorter, cooler evenings and the warm hues of autumn's embrace.
As October sweeps into Half Moon Bay, the winds begin to shift, averaging a brisk 3.8 m/s (9 mph). This moderate breeze maintains a pleasant energy, reminiscent of the mild winds seen earlier in the year, peaking in May at 5.4 m/s (12 mph). Following a trend of gradual decline throughout the summer, when wind speeds dipped to their lowest in September at 3.1 m/s (7 mph), October brings a refreshing change—reviving the air with a slightly stronger yet still gentle touch. As we transition into the cooler months, November's anticipated dip to 3.0 m/s (7 mph) hints at the typical seasonal patterns of Half Moon Bay, where the winds embody a playful dance between calm and invigorating breezes.
The weather in Half Moon Bay changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of October's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Half Moon Bay and find detailed weather information for every month.
October and January present quite different weather patterns. In October, temperatures range from a minimum of 9°C (49°F) to a maximum of 27°C (80°F), with an average of 15°C (60°F) and relatively low precipitation of 27 mm (1.1 in) spread over just 2 days. The humidity stands at 80%, offering a mild and comfortable climate. In contrast, January experiences cooler temperatures with a minimum of 5°C (41°F) and a maximum of 20°C (68°F), averaging only 11°C (53°F). It is also much wetter, with precipitation of 102 mm (4.0 in) over 9 days and slightly higher humidity at 85%. For more details on weather specifics during this month, check out Half Moon Bay weather in January.
October and February present distinct contrasts in weather. In October, temperatures range from a minimum of 9°C (49°F) to a maximum of 27°C (80°F), with an average of 15°C (60°F). The month typically sees low precipitation, averaging just 27 mm (1.1 in) over about 2 days, accompanied by a humidity level of 80%. In contrast, February experiences cooler temperatures, with a minimum of 5°C (41°F) and a maximum of 20°C (69°F), averaging 11°C (53°F). This month is also wetter, receiving about 101 mm (4.0 in) of precipitation across 9 days, and maintains a slightly higher humidity of 82%. For more specific details about February weather, you can check Half Moon Bay weather in February.
When comparing the weather in October and March, October tends to have warmer conditions with an average temperature of 15°C (60°F) and highs reaching up to 27°C (80°F), whereas March experiences cooler average temperatures at 12°C (53°F) and a maximum of 19°C (67°F). While October sees relatively little precipitation, with only 27 mm (1.1 in) over 2 days, March is significantly wetter, receiving 77 mm (3.0 in) across 11 days. Humidity levels are fairly similar in both months, hovering around 80% in October and slightly higher at 82% in March. For more detailed insights into March weather, visit Half Moon Bay weather in March.
When comparing the weather between October and April, October tends to be slightly warmer, with temperatures averaging around 15°C (60°F) and reaching a maximum of 27°C (80°F). In contrast, April sees a lower average temperature of 12°C (55°F), with highs reaching 25°C (78°F). Precipitation is also notable; October receives about 27 mm (1.1 in) over just 2 days, while April records a bit more rain at 34 mm (1.3 in) spread over 5 days. Humidity levels remain comparable, with October at 80% and April slightly lower at 79%. For more detailed insights into April weather specifically, you can check out Half Moon Bay weather in April.
October generally boasts warmer temperatures compared to May, with an average high of 27°C (80°F) versus May's maximum of 21°C (69°F). The minimum temperatures are similar, resting around 9°C (49°F), but October’s average temperature is higher at 15°C (60°F) compared to May's average of 13°C (56°F). Both months experience a similar amount of precipitation over two days, with October receiving slightly more at 27 mm (1.1 in) compared to May's 22 mm (0.9 in). Humidity levels are also comparable, with October at 80% and May at 83%. For more details on the weather patterns in May, you can visit Half Moon Bay weather in May.
When comparing the weather in October and June, both months exhibit similar temperature ranges, with average highs around 27°C (81°F) and lows that diverge slightly, with October starting at 9°C (49°F) and June at 10°C (51°F). Notably, October experiences more precipitation, with an average of 27 mm (1.1 in) over two days, while June is notably drier, receiving only 4 mm (0.2 in) with no recorded rainy days. Additionally, humidity levels are slightly higher in June at 84% compared to 80% in October, making both months feel relatively moist but with June offering sunnier skies. For more details, you can check Half Moon Bay weather in June.
When comparing the weather in October and July, notable differences emerge. October tends to be warmer, with a maximum temperature reaching 27°C (80°F) compared to July's maximum of 20°C (69°F). Both months have similar average temperatures around 15°C (59°F), yet October experiences slightly cooler minimum temperatures at 9°C (49°F) versus July's 11°C (51°F). Precipitation is another distinction; October sees about 27 mm over 2 days, while July records only a minimal 3 mm with no rainy days at all. Additionally, July's humidity is slightly higher at 87%, compared to October's 80%. For more detailed information, check out Half Moon Bay weather in July.
When comparing the weather in October to August, several notable differences emerge. October generally presents a wider range of temperatures, with minimums around 9°C (49°F) and maximums reaching up to 27°C (80°F), averaging at 15°C (60°F). In contrast, August tends to be slightly warmer overall, with minimum temperatures around 11°C (53°F) and a maximum of 24°C (76°F), averaging 16°C (61°F). Precipitation is also more pronounced in October, with an average of 27 mm (1.1 in) spread over two days, while August experiences minimal rainfall, only 3 mm (0.1 in) with no rain days noted. Additionally, humidity levels are high in both months, with October at 80% and August slightly higher at 87%. For more details on August's climate, visit Half Moon Bay weather in August.
In comparing the weather between September and October, October typically presents cooler temperatures, with a minimum of 9°C (49°F) and a maximum of 27°C (80°F), compared to September's higher range of 11°C (52°F) to 31°C (88°F). Additionally, October experiences slightly more precipitation, receiving 27 mm (1.1 in) over two days, while September remains dry with only 3 mm (0.1 in) and no measurable days of rain. Humidity levels in October average 80%, which is a bit lower than September's 86%. For a detailed look at the weather patterns in September, you can check Half Moon Bay weather in September.
October typically showcases milder weather, with temperatures ranging from a minimum of 9°C (49°F) to a maximum of 27°C (80°F) and an average of 15°C (60°F). This month sees only about 27 mm (1.1 in) of precipitation over just two days, alongside a relatively high humidity level of 80%. In contrast, November brings cooler temperatures, with a minimum of 7°C (45°F) and a maximum of 21°C (70°F), averaging 13°C (56°F). This month experiences increased precipitation of 48 mm (1.9 in) over five days, while humidity remains slightly lower at 79%. For more specific details on November weather, you can check Half Moon Bay weather in November.
When comparing the weather in October and December, October tends to be milder with average temperatures ranging from a minimum of 9°C (49°F) to a maximum of 27°C (80°F), while December sees cooler temperatures with a range of 6°C (44°F) to 19°C (67°F). October experiences relatively low precipitation, totaling 27 mm (1.1 in) over just two days, whereas December is significantly wetter, with 92 mm (3.6 in) falling across ten days. Both months have high humidity levels, although October is slightly more humid at 80% compared to December's 79%. For more detailed insights into December weather, check out Half Moon Bay weather in December.
As October settles in, Half Moon Bay experiences a delightful shift in weather that sets it apart from the summer months. The temperatures begin to cool, offering a comfortable average of 15°C (60°F), ideal for outdoor activities. With just a couple of days of rain totaling 27 mm (1.1 in), this month enjoys a reprieve from the heavier precipitation seen in the winter. The humidity remains high at 80%, adding a touch of coastal charm to the crisp autumn air. As the scenery transforms with fall colors, October provides a unique blend of warmth and refreshing coolness that perfectly captures the essence of California's coast. For a deeper dive into the patterns and variations of the weather, check out Half Moon Bay Climate.