Last updated: August 28, 2025
Experience the charming September weather in Monaco, where the average temperature hovers around 21°C (69°F), with highs reaching a delightful 26°C (79°F) and lows dipping to a comfortable 14°C (58°F). This month sees 9 days of rainfall, accumulating to 47 mm (1.9 in), making it a refreshing time to explore the vibrant coastline. With humidity levels at 71%, the air carries a gentle warmth, perfect for enjoying outdoor activities or leisurely strolls through the city's stunning landscapes.
September in Monaco offers a delightful transition from the summer warmth, with temperatures reflecting a balanced mix of lingering heat and the onset of autumn. As the month unfolds, temperatures range from a pleasant minimum of 14°C (58°F) to a comfortable maximum of 26°C (79°F), with an average of 21°C (69°F). This period sees a gradual decline in both daytime warmth and nighttime chill compared to the peak summer months of July and August. It's an excellent time for visitors to savor outdoor activities, as the climate remains inviting while the summer crowds start to diminish. Enjoying a stroll along the Mediterranean coast or indulging in al fresco dining is particularly appealing in this mild and enjoyable weather.
September in Monaco ushers in a moderate shift in precipitation, with 47 mm (1.9 in) of rain spread across 9 days. This marks a slight increase from the drier summer months of July and August, where only 24 mm (0.9 in) and 27 mm (1.1 in) were recorded, respectively. As autumn approaches, the rainfall begins to pick up pace, signaling the transition to wetter conditions that will dominate in October and November, when averages soar to 120 mm (4.7 in) and 143 mm (5.6 in). This gradual uptick in precipitation not only reflects the changing season but also sets the stage for the lush, vibrant scenery that Monaco is known for in the cooler months.
As summer transitions into fall, September in Monaco experiences a comfortable humidity level of 71%, offering a pleasant respite from the peak summer months. This slight increase from August's 66% reflects a gradual shift in the atmosphere as the region prepares for the wetter autumn ahead. The humidity trends reveal a typical pattern, where levels are generally high in the early months of the year, peaking at 82% in November. September's humidity, however, remains relatively moderate compared to the previous months, creating an inviting climate for both locals and tourists to enjoy the lingering warmth before the cooler October days approach. Overall, these fluctuations in humidity create a dynamic coastal environment that showcases Monaco's charming allure year-round.
As September arrives in Monaco, the UV Index stands at 7, indicating a high level of exposure to the sun's rays, with a burn time of about 25 minutes. This marks a slight decline from the peak summer months of July and August, where values reached 9. Nonetheless, it's essential to remain vigilant as conditions are still significant for sun exposure. Following the intense UV levels seen in late spring and summer, September transitions to a more moderate but still considerable risk, serving as a reminder to prioritize sun protection during outdoor activities. For more detailed insights on how to enjoy the sun safely, visit Monaco UV Index.
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As summer slowly transitions into autumn, September in Monaco boasts a remarkable 344 hours of sunshine, maintaining a pleasant glow that lingers from the vibrant months of July and August. This month marks a gradual decline from the sun-drenched heights of summer, yet it still outshines many others in the year, significantly surpassing October and November. With the sun-kissed days of June and July peaking at 420 and 435 hours respectively, September offers a delightful blend of warmth and moderate crowds, making it an ideal time for visitors seeking to bask in the Mediterranean sun while enjoying the last whispers of summer. As the year progresses towards winter, the sun's presence dwindles, but September holds a cherished spot as a radiant farewell to the sunlit days of the Riviera.
As September arrives in Monaco, the likelihood of sunny weather presents a refreshing transition from the peak summer months. With a 50% chance of sunshine, it marks a slight dip from the sun-soaked August, which boasts a robust 67% likelihood. This subtle decrease is typical as the warmth of summer begins to wane, yet September remains a relatively bright month compared to the cooler fall months ahead. Interestingly, while June to August showcases consistently high probabilities of sunny days, September's forecast reflects a balanced mix of sun and cloud, promising visitors still ample opportunity to enjoy the Mediterranean charm. Embrace the mild weather and soak in the stunning coastal views, as Monaco continues to offer delightful days even as summer ebbs away.
As September graces Monaco, daylight begins its gentle retreat, offering about 12 hours of sunlight—a soft transition from the 15 hours of brightness enjoyed during the peak summer months. Following the lingering warmth of August, September marks a shift toward autumn, with shorter days reminding us of the seasonal changes ahead. This gradual decrease in daylight reflects the region’s rhythm, where vibrant summer days give way to the cozy embrace of autumn, culminating in a balanced blend of light and shadow that characterizes this enchanting coastal town. As the month unfolds, each sunset serves as a poignant reminder of nature's cycles, drawing us into the beauty of the changing seasons.
As September arrives in Monaco, a gentle breeze graces the Mediterranean coastline, with an average wind speed of 2.7 m/s (6 mph). This serene atmosphere is consistent with the summer months, where winds have remained relatively light, peaking briefly in November at 4.6 m/s (10 mph), the highest of the year. With October showing a slight increase back to 3.3 m/s (7 mph), it’s clear that as the year transitions into autumn, the winds begin to pick up again. Overall, September's wind reflects the tranquil charm of Monaco, inviting visitors to enjoy the sun-soaked days and cool evenings amidst the soft caress of a Mediterranean zephyr.
Weather in Monaco varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Monaco, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January showcase contrasting weather patterns. In September, temperatures range from a mild 14°C (58°F) at night to a warm 26°C (79°F) during the day, with an average of 21°C (69°F). The month sees about 47 mm (1.9 in) of precipitation spread over 9 days and a humidity level of 71%. In stark contrast, January experiences cooler conditions, with temperatures dipping to a minimum of 3°C (38°F) and peaking at 15°C (60°F), averaging only 9°C (48°F). Precipitation is slightly higher at 53 mm (2.1 in) but occurs over fewer days, just 6, and the humidity rises to 80%. For more details on January weather patterns, visit Monaco weather in January.
September and February present contrasting weather conditions. In September, temperatures range from a cool 14°C (58°F) to a warm 26°C (79°F), with an average of 21°C (69°F). The month experiences moderate precipitation at 47 mm (1.9 in) over 9 days, along with a humidity level of 71%. In stark contrast, February is much colder, with temperatures fluctuating from a chilly -1°C (30°F) to a mild 16°C (61°F), averaging around 10°C (50°F). Despite slightly lower precipitation at 46 mm (1.8 in) over just 6 days, February's humidity is slightly higher at 73%. For those interested in more details, you can check Monaco weather in February.
When comparing the weather in September and March, notable differences emerge. September typically offers milder temperatures with an average of 21°C (69°F) and highs reaching 26°C (79°F), while March's average temperature is significantly cooler at 11°C (51°F), peaking at 17°C (63°F). Precipitation levels also vary, as September receives 47 mm (1.9 in) over about 9 days, whereas March sees an increase in rainfall, totaling 73 mm (2.9 in) across 8 days. Both months share a similar humidity level of 71%, making them feel distinctly different despite this commonality. For more detailed information on March weather, you can check Monaco weather in March.
When comparing the weather in September and April, we find notable differences in temperature and precipitation. September enjoys warmer temperatures, with averages ranging from a minimum of 14°C (58°F) to a maximum of 26°C (79°F), while April is cooler, with averages between 6°C (43°F) and 21°C (70°F). In terms of precipitation, April experiences slightly more rainfall, totaling 75 mm (3.0 in) over about 10 days, compared to September's 47 mm (1.9 in) over 9 days. Humidity levels are similar, with September at 71% and April at 75%. For a detailed look into April's weather conditions, you can check Monaco weather in April.
When comparing the weather in September and May, one can note some intriguing differences. September enjoys warmer temperatures, with averages around 21°C (69°F) and maximums soaring up to 26°C (79°F), while May has cooler averages of 16°C (61°F) and a minimum temperature of 9°C (48°F). Precipitation is more frequent in May, with about 70 mm (2.7 in) falling over 13 days compared to September's 47 mm (1.9 in) over 9 days. Both months experience high humidity levels, but September's 71% is slightly lower than May's 74%. For more insights on the weather in May, visit Monaco weather in May.
September and June both showcase mild temperatures, but there are some notable differences in their weather patterns. In September, the average temperature reaches 21°C (69°F), with a noticeable maximum of 26°C (79°F), while June presents a slightly higher maximum of 29°C (85°F) despite having an average temperature of 20°C (68°F). Both months experience similar precipitation levels, with September seeing 47 mm (1.9 in) over 9 days and June slightly less at 43 mm (1.7 in) over 8 days. Humidity levels remain comparable, with September at 71% and June at 72%. For a closer look at the weather in June, check out Monaco weather in June.
In comparing the weather of July and September, we see notable differences in temperature and precipitation. July generally experiences warmer conditions with an average temperature of 23°C (74°F), peaking at 29°C (84°F), whereas September sees a slight cooling off, with averages around 21°C (69°F) and maximums of 26°C (79°F). Additionally, September tends to be wetter, receiving 47 mm (1.9 in) of rainfall over about 9 days, compared to July's 24 mm (0.9 in) over just 5 days. Humidity levels are also slightly higher in September at 71%, compared to 69% in July. For more detailed information on July weather, you can check out Monaco weather in July.
In comparing the weather between September and August, it is notable that September experiences slightly cooler temperatures, with a minimum of 14°C (58°F) and an average of 21°C (69°F), compared to August's warmer minimum of 18°C (64°F) and average of 24°C (75°F). Additionally, September tends to be wetter, with 47 mm (1.9 in) of precipitation over 9 days, whereas August sees only 27 mm (1.1 in) across 6 days. Furthermore, humidity levels are higher in September at 71%, compared to 66% in August. For more detailed insights on August weather specifically, see Monaco weather in August.
September brings milder temperatures, with a minimum of 14°C (58°F) and an average of 21°C (69°F), reaching a maximum of 26°C (79°F). The month sees a total precipitation of 47 mm (1.9 in) over 9 days, coupled with a humidity level of 71%. In contrast, October experiences cooler temperatures, with a minimum dropping to 8°C (47°F) and an average of 17°C (63°F), peaking at 22°C (73°F). Furthermore, October is notably wetter, recording 120 mm (4.7 in) of rainfall over just 8 days, and a slightly higher humidity of 78%. For more detailed insights, you can check Monaco weather in October.
September generally offers milder temperatures compared to November, with average highs around 21°C (69°F) and lows of 14°C (58°F), while November sees a notable drop, with averages of 13°C (55°F) and lows around 6°C (44°F). In terms of precipitation, September experiences 47 mm (1.9 in) over approximately 9 days, whereas November is much wetter, with 143 mm (5.6 in) spread across 13 days, leading to higher humidity levels of 82%. For more details about November's weather, you can check Monaco weather in November.
September and December exhibit notable differences in weather patterns. September boasts milder temperatures, with averages around 21°C (69°F) and maximums reaching 26°C (79°F), making it a pleasant time of year. In contrast, December's temperatures drop significantly, averaging just 10°C (50°F) and peaking at 16°C (61°F). Additionally, December experiences higher precipitation levels, totaling 111 mm (4.4 in) over approximately 10 days, compared to September's 47 mm (1.9 in) over 9 days. Humidity also rises in December, reaching 79% compared to September's 71%. For a detailed look at the conditions during this time, you can check out Monaco weather in December.
As summer transitions into fall, September in Monaco offers a delightful balance of warm temperatures and moderate humidity, making it a unique time to visit. While the days are generally pleasant, with averages around 21°C, the evenings cool down more noticeably compared to the height of summer. With an average of nine days of precipitation, September marks a slight increase in rainfall, but this is usually brief and shouldn't deter outdoor activities. The overall ambiance during this month is characterized by a softer light and a less crowded atmosphere, inviting visitors to explore the beauty of the city-state at a more leisurely pace. For a comprehensive look at weather trends throughout the year, check out Monaco Climate.