Last updated: February 24, 2025
September in Monterey, United States, offers a delightful transition into autumn, characterized by comfortable temperatures. With a maximum of 29°C (84°F) and an average temperature hovering around 15°C (59°F), visitors can enjoy pleasantly warm days and cooler nights, ideal for exploring the stunning coastal scenery. The minimum temperature rarely dips below 12°C (54°F), ensuring a mild climate throughout the month. Notably, precipitation is minimal this time of year, with only 4 mm (0.2 in) recorded and a remarkable 0 days of rain, allowing for uninterrupted outdoor activities. With a humidity level of 55%, the atmosphere remains refreshingly crisp, making September one of the best months to experience the beauty of Monterey.
In September, Monterey basks in a pleasant shift in temperatures, showcasing a notable increase as summer comes to a close. With minimums settling at 12°C (54°F) and averages around 15°C (59°F), the coastal city offers a comfortable climate perfect for outdoor activities. However, the standout feature of this month is the peak temperature, reaching a delightful 29°C (84°F), making it the warmest month of the year. This warm spell invites residents and visitors alike to enjoy Monterey's stunning beaches and vibrant coastal scenery. As the days grow shorter and the ocean breezes remain refreshing, September marks a harmonious transition into fall, with warmth lingering just a little longer before the cooler months set in.
In Monterey, United States, September marks a significant lull in precipitation, with only 4 mm (0.2 in) of rain recorded, mirroring the dry spell experienced in the months before it. Notably, there are no precipitation days in September, which aligns with the summer trend where rainfall becomes sparse, as indicated by the zero rainfall days in both June, July, and August. As the weather transitions into the fall months, this pattern of limited precipitation hints at changing climatic dynamics, preparing Monterey for the slightly wetter conditions that typically arrive in October and beyond. The steep drop from the winter highs of over 100 mm in earlier months further highlights the dry summer period, making each drop of rain in the subsequent months feel like a welcomed respite.
As September arrives in Monterey, the coastal charm is complemented by a refreshing dip in humidity, which hovers around 55%. This marks a slight increase from the dry summer months, where July and August recorded their lowest figures at 58% and 54%, respectively. The gradual rise in humidity is a prelude to the upcoming fall season, which typically brings more moisture as October sets in with a 62% level. Notably, the humidity in September still remains significantly lower than the winter months, where levels peak in January and February at 82% and 84%. This subtle transition highlights Monterey's unique coastal climate, where dry summer air gives way to a more temperate and inviting atmosphere as autumn approaches.
As the summer comes to a close, the September UV Index in Monterey showcases a significant drop from the extreme levels experienced in July and August. With a UV Index of 9, this month falls into the very high exposure category, indicating that while the risk of harm from unprotected sun exposure remains considerable, it is less intense than the peak summer months where the index reached 11. This reduction allows for a slightly longer burn time of 15 minutes for those unprotected. As autumn approaches, the UV Index continues to decline, providing a gentle reminder to stay vigilant about sun safety. For more information, check out the complete details at Monterey UV Index.
UV Risk Categories
As summer wanes, September in Monterey welcomes a delightful balance of warmth and sunshine, boasting 309 hours of glorious daylight. This month reflects a gradual decline from the peak of 377 hours seen in July, yet still retains a significant glow that invites both visitors and locals to enjoy the outdoors. With the transition into autumn, September offers a gentle respite from the intense summer sun, allowing for enjoyable beach outings and scenic hikes, while still providing more sunlight than earlier months like January, which starts with just 164 hours. This trend of diminishing light perfectly captures the essence of Monterey's picturesque charm, making it a captivating time to embrace the beauty of the coast.
As summer transitions to autumn, September in Monterey, United States, boasts a 58% chance of sunny weather, aligning with the higher probabilities seen in the late summer months. This promising figure is matched only by February and October, suggesting a delightful blend of warm days and clear skies ideal for outdoor activities. While July represents the low point in sunshine likelihood, followed closely by April and June, the sun seems to shine brighter as the year progresses into September, offering residents and visitors alike a wonderful opportunity to soak up the sun before the cooler months set in.
As summer fades into fall, September in Monterey sees a gentle transition in daylight, with approximately 12 hours of sunlight illuminating the days. This marks a subtle decline from the vibrant 14 hours enjoyed during the peak months of June and July. The gradual shortening of days signals the approach of autumn, as daylight begins to diminish steadily each month. Interestingly, September's length of daylight remains more generous than the earlier months of the year, such as January and February, which offer just 9 and 10 hours, respectively. This rhythmic shift not only reflects the changing seasons but also invites residents and visitors to savor the last warm days before the winter months set in.
As September rolls in, the winds in Monterey begin to mellow, with an average wind speed of just 3.3 m/s (7 mph), marking a noticeable dip from the summer months. This decline follows a trend seen throughout the late summer, where the winds gradually ease from a peak of 3.8 m/s (9 mph) in July to their lowest point in September. As the coastal fog gives way to clearer skies and the warm hues of autumn begin to paint the landscape, residents and visitors alike can enjoy the serene atmosphere, perfect for leisurely strolls by the waterfront. This gentle breeze sets the stage for October's return to slightly brisker winds, suggesting that while September may whisper softly, the seasons are ever on the move.
The weather in Monterey 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 Monterey and find detailed weather information for every month.
September weather is generally warmer and drier compared to January. With temperatures ranging from a minimum of 12°C to a maximum of 29°C, September enjoys an average temperature of 15°C and experiences little to no precipitation. In contrast, January is cooler, with temperatures fluctuating between 7°C and 18°C, and an average of just 12°C. Additionally, January is much wetter, receiving 112 mm of precipitation over approximately 10 days, along with a higher humidity level of 82%. For a detailed look at January weather conditions, you can visit Monterey weather in January.
In September, the weather boasts a comfortable range with minimum temperatures around 12°C (54°F) and pleasant maximums reaching up to 29°C (84°F), making it ideal for outdoor activities. With an average temperature of 15°C (59°F), this month experiences minimal precipitation, totaling just 4 mm (0.2 in) across the whole month and with no rainy days, along with a moderate humidity level of 55%.
In contrast, February is significantly cooler, with temperatures dipping to a minimum of 6°C (44°F) and reaching a maximum of 18°C (65°F), leading to an average of only 11°C (53°F). This month is also much wetter, experiencing 106 mm (4.2 in) of rain over 10 days, and it has higher humidity at 84%. For more details about the weather during this time, you can check Monterey weather in February.
September typically offers milder and more pleasant weather compared to March. With temperatures ranging from a minimum of 12°C (54°F) to a maximum of 29°C (84°F), September boasts a comfortable average of 15°C (59°F) and very little precipitation at just 4 mm (0.2 in) across 0 rainy days. In contrast, March experiences cooler temperatures, with a minimum of 7°C (45°F) and a maximum of 17°C (63°F), leading to an average of only 11°C (52°F). This month is notably wetter, receiving about 93 mm (3.7 in) of rain spread over 12 days, resulting in much higher humidity at 82%. For more insights on what to expect, check out Monterey weather in March.
When comparing the weather in September and April, it’s clear that September is generally warmer and drier. In September, temperatures range from a minimum of 12°C (54°F) to a maximum of 29°C (84°F), with an average of 15°C (59°F) and minimal precipitation at just 4 mm (0.2 in) over 0 rainy days, coupled with 55% humidity. In contrast, April sees cooler temperatures, with a minimum of 8°C (47°F) and a maximum of 19°C (67°F), averaging 11°C (53°F). April is significantly wetter, receiving 35 mm (1.4 in) of rain over about 6 days, and has higher humidity at 78%. For more detailed insights on April weather, you can check Monterey weather in April.
When comparing the weather in September and May, it's clear that September enjoys warmer temperatures and significantly less precipitation. September's temperatures range from a minimum of 12°C (54°F) to a comfortable maximum of 29°C (84°F), with an average of 15°C (59°F) and only 4 mm (0.2 in) of precipitation over the month. In contrast, May is cooler, with temperatures ranging from 9°C (48°F) to a maximum of 17°C (63°F), and an average of just 12°C (53°F), along with 26 mm (1.0 in) of rainfall spread over 4 days. Additionally, May experiences higher humidity at 71%, compared to September's 55%. For more details, check out Monterey weather in May.
In comparing the weather of September and June, we find that September generally boasts warmer temperatures, with an average of 15°C (59°F) and a maximum reaching 29°C (84°F), while June has a cooler average of 13°C (55°F) and a maximum of 25°C (78°F). Both months experience minimal precipitation, with only 4 mm (0.2 in) in September and slightly more at 5 mm (0.2 in) in June, and neither month records any rainy days. Additionally, September tends to be less humid at 55%, in contrast to June's relatively higher humidity of 64%. For more details, you can check Monterey weather in June.
In comparison to July, September experiences noticeably warmer temperatures, with a minimum of 12°C (54°F) and an average of 15°C (59°F), compared to July's minimum of 11°C (51°F) and average of 13°C (56°F). The maximum temperature in September reaches up to 29°C (84°F), significantly higher than July's peak of only 16°C (61°F). Both months see the same amount of precipitation, 4 mm (0.2 in) over 0 days, but September boasts lower humidity at 55%, while July's humidity sits slightly higher at 58%. For more specifics on July weather, you can check Monterey weather in July.
In comparing the weather between September and August, September boasts warmer temperatures with a minimum of 12°C (54°F) and an average of 15°C (59°F), peaking at a maximum of 29°C (84°F). In contrast, August's temperatures range from a minimum of 12°C (54°F) to an average of 14°C (58°F), with a maximum of only 21°C (70°F). Both months experienced minimal precipitation, with September recording just 4 mm (0.2 in) and August slightly higher at 5 mm (0.2 in), yet neither month had any rainfall. Humidity levels remained quite similar, with September at 55% and August at 54%. For more details on August weather specifics, you can visit Monterey weather in August.
In September, the weather is generally warmer, with temperatures ranging from a minimum of 12°C (54°F) to a maximum of 29°C (84°F) and an average of 15°C (59°F). This month experiences very little precipitation, with only 4 mm (0.2 in) recorded over the entire month, leading to a pleasant humidity level of 55%. In contrast, October sees a slight drop in temperatures, with a minimum of 10°C (51°F) and a maximum of 25°C (77°F), while still maintaining the same average of 15°C (59°F). However, October is considerably wetter, receiving 21 mm (0.8 in) of rain over 2 days, and the humidity rises to 62%. For more details about October weather trends, check out Monterey weather in October.
In September, the weather tends to be warm and pleasant, with temperatures ranging from a minimum of 12°C (54°F) to a maximum of 29°C (84°F) and an average temperature of 15°C (59°F). With only 4 mm (0.2 in) of precipitation and no rain days, the humidity sits comfortably at 55%. In contrast, November brings cooler temperatures, with a minimum of 8°C (46°F) and a maximum of 20°C (68°F), averaging around 14°C (57°F). This month is significantly wetter, experiencing 42 mm (1.7 in) of precipitation across about 5 days, and the humidity increases to 78%. For more specific details, you can check the Monterey weather in November.
September typically offers warmer and drier weather compared to December, with temperatures ranging from a minimum of 12°C (54°F) to a maximum of 29°C (84°F) and very little precipitation. In contrast, December experiences cooler temperatures, averaging between 8°C (47°F) and 21°C (69°F), along with significantly increased rainfall, averaging 105 mm (4.1 in) over about 10 days. The humidity also rises in December, averaging around 80%, compared to 55% in September. For a detailed look at December weather in Monterey, you can visit Monterey weather in December.
September in Monterey offers a delightful transition towards milder weather, setting itself apart from the more extreme summer months. With maximum temperatures comfortably resting around 29°C (84°F) and average temperatures hovering at 15°C (59°F), visitors can enjoy pleasantly warm days without the overwhelming heat. Unlike the wetter seasons, September boasts an impressive 0 days of precipitation, complimented by a moderate humidity level of 55%, making it an ideal time for outdoor activities. This month emerges as a sweet spot where summer's warmth lingers just before the cooler autumn air takes hold. For a more in-depth look at what to expect, check out Monterey Climate.