September Weather in Portofino, Italy

Last updated: March 24, 2025

In September, the picturesque coastal town of Portofino, Italy, welcomes a delightful blend of warmth and mildness. With maximum temperatures reaching up to 28°C (82°F) and an average of 22°C (71°F), visitors can savor the beautiful Mediterranean climate. However, the month brings a chance of rain, totaling approximately 85 mm (3.3 in) over 9 days, contributing to the lush scenery that characterizes the region. The humidity levels hover around 74%, adding a touch of pleasantness to the air, making September an ideal time for leisurely strolls along the vibrant harbor and exploring the charming streets of this idyllic location.

September Temperature in Portofino

As summer gracefully transitions into fall, September presents a delightful climate in Portofino, Italy. With minimum temperatures hovering around 15°C (59°F) and averages reaching up to 22°C (71°F), visitors can enjoy warm, inviting days. The maximum temperatures peak at 28°C (82°F), ensuring plenty of sunshine for leisurely strolls along the stunning coastline. This month strikes a perfect balance between the lingering warmth of summer and the cooler autumn evenings, making it an ideal time to explore the picturesque harbor and indulge in local cuisine. As the crowds begin to disperse, September offers a serene escape, showcasing Portofino in a charming, more laid-back atmosphere.

September Weather in Portofino: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Portofino, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec505152566270757671645752
Data source: Temperature data for Portofino 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 Portofino

In September, Portofino experiences a pleasant transition from the dry summer to the impending autumn, with precipitation amounting to 85 mm (3.3 in). During this month, rainfall occurs over nine days, indicating a mild uptick in wet weather compared to the drier summer months of July and August. This trend of increasing rain paves the way for a significant rise in precipitation as the year progresses, with October and November expected to deliver much more substantial totals—211 mm (8.3 in) and 216 mm (8.5 in) respectively. Thus, while September offers a hint of the coming rains, it still holds onto the lingering warmth of summer, making it a captivating time for visitors and locals alike.

September Precipitation Trends in Portofino

The chart displays monthly precipitation patterns in Portofino, 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.
JanFebMarAprMayJunJulAugSepOctNovDec921211169410740303585211216194
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Portofino

In September, Portofino experiences a noticeable shift in humidity, averaging around 74%. This marks a slight increase from the summer's low of 64% in August, as the region transitions toward autumn. The easing warmth of early fall leads to a more comfortable, yet still humid, atmosphere compared to the drier mid-summer months. As the year progresses, humidity levels begin to rise again into the colder months, peaking at 88% in both January and November. This gradual increase, combined with the summer's steadily declining humidity, highlights Portofino's characteristic climate, where high humidity is a common theme as seasons change.

September Average Humidity in Portofino

This chart illustrates the average monthly humidity levels in Portofino, 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.
JanFebMarAprMayJunJulAugSepOctNovDec88%81%76%77%74%71%67%64%74%87%88%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Portofino

As summer transitions to autumn in Portofino, Italy, September brings a notable shift in the UV Index, which registers at a high level of 7. This indicates a moderate risk of harm from unprotected sun exposure, with a burn time of 25 minutes for fair-skinned individuals. Compared to the blistering UV Index 9 seen in July and June, September offers a somewhat gentler sun, yet caution is still advised. This trend of high to very high UV levels from May through August peaks in mid-summer, and autumn begins to taper off with a gradual decline in solar intensity. Travelers and locals alike should remain aware of these UV fluctuations to protect their skin while enjoying the stunning coastal views. For more detailed information, visit Portofino UV Index.

Maximum UV Index Levels in Portofino for September

The chart shows the monthly maximum UV Index (UVI) for Portofino 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.
JanFebMarAprMayJunJulAugSepOctNovDec236789987532
Data source: Portofino 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 Portofino

As summer gracefully transitions into autumn, September in Portofino, Italy offers a delightful blend of warmth and sunshine, boasting 341 hours of sun. This month, while slightly less sun-drenched than the peak of July at 427 hours, still shines brightly compared to the earlier months of the year, which struggled to surpass 310 hours until March. The gradual decrease in sunshine from the bustling summer months invites visitors to savor the stunning coastal views without the usual crowds, making it an ideal time for leisurely strolls along the picturesque harbor or dining al fresco under the warm Italian sun. As the days shorten, the lingering sunlight wraps the charming village in a golden glow, creating a serene backdrop for unforgettable moments.

Monthly Sunshine Duration in Portofino: September Highlighted

The September sunshine duration represents the total number of hours Portofino 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.
JanFebMarAprMayJunJulAugSepOctNovDec187h230h310h347h389h413h427h398h341h297h227h217h
Data source: Portofino September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Portofino During September

In Portofino, Italy, the likelihood of sunny weather in September stands at a respectable 54%, maintaining a balance between light and cloud cover. While this figure is slightly lower than the sunniest month, August, which boasts a 63% chance of sunshine, September emerges as a desirable option for those seeking pleasant weather without the peak summer crowds. This transitional month continues the trend of summer warmth, offering a comfortable backdrop for exploration and relaxation. As the autumn season approaches, the likelihood remains favorable, making it a lovely time to enjoy Portofino’s stunning coastal vistas.

Percentage of Sunny Days in September in Portofino

The chart illustrates the percentage of sunny days in Portofino 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 Portofino experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec37%47%61%50%45%55%57%63%54%54%40%47%
Data source: Portofino September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Portofino in September

As summer transitions into autumn, September in Portofino, Italy, offers a pleasant 12 hours of daylight, marking a gentle decline from the sun-drenched heights of 15 hours in June and July. This gradual retreat of daylight signals a change in the season, yet September still embodies the warmth of summer, allowing for leisurely exploration of the stunning coastal vistas. The shift from the vibrant summer months to the softer light of early autumn creates an enchanting atmosphere, making it an ideal time to soak in the lingering sun and enjoy the beauty of this picturesque seaside town before the daylight hours dwindle further into the fall.

Average Daylight Hours in Portofino for September

The chart illustrates the variation in daylight duration in Portofino throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 15m10h 27m11h 56m13h 28m14h 47m15h 27m15h 6m13h 56m12h 28m10h 56m9h 35m8h 53m
Data source: Portofino daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Portofino

As summer gracefully fades into autumn, September in Portofino offers a gentle breeze with an average wind speed of 3.0 m/s (7 mph), providing a serene backdrop for the charming coastal town. While the summer months feature slightly stronger winds, with July and August both hovering at 3.4 m/s (8 mph), September's soft winds evoke a tranquil atmosphere, ideal for leisurely strolls along the picturesque harbor or enjoying al fresco dining. As the month progresses, the winds begin to pick up slightly in October, reaching 4.6 m/s (10 mph), setting the stage for the vibrant changes that autumn brings. This subtle shift in the wind is a reminder of nature's rhythm, mirroring the transition from the lively summer tourist season to the more peaceful fall months.

Average September Wind Speed in Portofino

The chart displays monthly wind speed patterns in Portofino, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.04.43.73.73.93.03.43.43.0 m/s4.65.93.7
Data source: Portofino September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Portofino Compares to Other Months

The weather in Portofino 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 Portofino and find detailed weather information for every month.

In September, the weather tends to be notably warmer, with temperatures ranging from a minimum of 15°C (59°F) to a maximum of 28°C (82°F) and an average of 22°C (71°F). The month experiences approximately 85 mm (3.3 in) of precipitation over around 9 days, accompanied by a humidity level of 74%. In contrast, January is much cooler, with temperatures dipping to a minimum of 4°C (40°F) and only reaching a maximum of 16°C (61°F), averaging at 10°C (50°F). While precipitation slightly increases to 92 mm (3.6 in) over 10 days, the humidity rises to 88%, creating a feeling of chilliness. For a more detailed look into January's climate, you can check Portofino weather in January.

September and February present strikingly different weather conditions. In September, temperatures range from a mild 15°C (59°F) at night to a warm 28°C (82°F) during the day, with an average of 22°C (71°F). The month experiences 85 mm (3.3 in) of precipitation over 9 days and maintains a humidity level of 74%. In contrast, February's temperatures are significantly cooler, with minimums dropping to -1°C (31°F) and a maximum of 17°C (62°F), averaging just 10°C (51°F). February sees more precipitation, totaling 121 mm (4.8 in) across 13 days, along with higher humidity at 81%. For those looking for detailed weather insights, check out Portofino weather in February.

September and March present contrasting weather patterns. September is characterized by warmer temperatures, with an average of 22°C (71°F), while March is much cooler, averaging only 11°C (52°F). In September, the minimum temperature is 15°C (59°F) and can reach a maximum of 28°C (82°F), making it ideal for outdoor activities. In contrast, March sees a chilly minimum of 1°C (34°F) and peaks at 18°C (64°F). Both months experience significant rainfall, but March has slightly higher precipitation at 116 mm (4.6 in) compared to September's 85 mm (3.3 in), and March sees rainfall on 11 days compared to September's 9 days. Humidity levels are also relatively similar, with September at 74% and March at 76%. For more specific details on March weather, you can check Portofino weather in March.

In comparing the weather of September and April, September enjoys warmer temperatures, with average highs reaching 28°C (82°F) compared to April's maximum of 22°C (71°F). The minimum temperature in September starts at a comfortable 15°C (59°F), while April's minimum is significantly cooler at 6°C (43°F). Both months experience a similar level of precipitation, with September receiving 85 mm (3.3 in) over about 9 days and April slightly more at 93 mm (3.7 in) across 8 days. Humidity levels are also comparable, with September at 74% and April at 77%, adding a touch of dampness to the spring air. For those interested in specifics about April weather patterns, please refer to Portofino weather in April.

When comparing the weather in September and May, September tends to be warmer with an average temperature of 22°C (71°F) compared to May's cooler average of 17°C (62°F). The maximum temperature in September reaches up to 28°C (82°F), while May only sees a peak of 26°C (78°F). However, May experiences slightly more precipitation, with 107 mm (4.2 in) over 13 days, compared to September's 85 mm (3.3 in) over 9 days. Both months share the same humidity level of 74%, creating a comfortable atmosphere. For a detailed look at May weather, you can visit Portofino weather in May.

In September, the weather tends to be slightly warmer than in June, with average temperatures reaching 22°C (71°F) compared to June's average of 21°C (70°F). However, September experiences higher maximum temperatures, peaking at 28°C (82°F), while June can reach up to 29°C (85°F). Precipitation is considerably greater in September, with 85 mm (3.3 in) over 9 days, compared to June's 40 mm (1.6 in) across 7 days. Humidity levels are also a bit higher in September at 74%, versus June's 71%. For more detailed insights on June weather, you can check Portofino weather in June.

In comparing the weather of September and July, September tends to be slightly cooler with average temperatures ranging from a minimum of 15°C (59°F) to a maximum of 28°C (82°F), while July is warmer, featuring a minimum of 19°C (66°F) and a maximum of 29°C (85°F). Additionally, September experiences more rainfall, with 85 mm (3.3 in) over about 9 days, compared to July's drier conditions with only 30 mm (1.2 in) falling on 5 days. Humidity levels are also higher in September at 74%, while July maintains a more comfortable 67% humidity. For more detailed insights on July weather, you can visit Portofino weather in July.

In comparing the weather of September and August, September experiences slightly cooler temperatures, with minimums of 15°C (59°F) and averages around 22°C (71°F), whereas August boasts higher minimums of 19°C (66°F) and an average of 25°C (77°F). Additionally, September sees increased rainfall, with 85 mm (3.3 in) over 9 days, in contrast to August's 35 mm (1.4 in) spread across just 5 days. The humidity levels also rise in September to 74%, compared to August's more comfortable 64%. For more detailed information about August conditions, you can check Portofino weather in August.

September typically offers warmer temperatures, with minimums around 15°C and maximums reaching up to 28°C, while October sees a drop with minimums of 13°C and maximums peaking at 24°C. Precipitation significantly increases in October, rising to 211 mm over 11 days compared to September’s 85 mm across 9 days. Additionally, October brings higher humidity levels, which average at 87%, compared to September's 74%. For more detailed information on October weather, you can visit Portofino weather in October.

In September, temperatures are quite mild, with averages around 22°C (71°F) and maximums reaching up to 28°C (82°F). The month sees moderate rainfall of 85 mm (3.3 in) over approximately 9 days, along with a humidity level of 74%. In contrast, November brings a significant drop in temperatures, with an average of 14°C (57°F) and highs of only 19°C (67°F). Rainfall increases considerably to 216 mm (8.5 in) over 17 days, accompanied by higher humidity at 88%. For a detailed look at what to expect, check out Portofino weather in November.

In September, the weather is generally warmer and more pleasant, with temperatures ranging from a minimum of 15°C (59°F) to a maximum of 28°C (82°F) and an average of 22°C (71°F). The month sees about 85 mm (3.3 in) of precipitation over approximately 9 days, accompanied by a moderate humidity level of 74%.

In contrast, December brings cooler temperatures, with a minimum of 5°C (42°F), an average of 11°C (53°F), and a maximum of 16°C (62°F). This month experiences significantly higher rainfall, totaling 194 mm (7.6 in) across about 15 days, and the humidity rises to 85%. For more details, check out Portofino weather in December.

Compare Portofino's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Portofino

As summer transitions into fall, September weather in Portofino offers a delightful blend of warmth and mildness, making it distinct from the hotter months of July and August. With average temperatures hovering around a comfortable 22°C (71°F), visitors can enjoy pleasant days and cool evenings. However, the month also sees an increase in precipitation, with around 85 mm (3.3 in) falling across 9 days, contributing to a comfortable humidity level of 74%. This unique combination of warmth and occasional rain creates a vibrant atmosphere, perfect for exploring this picturesque coastal town. For a deeper understanding of what to expect throughout the year, check out Portofino Climate.