Last updated: August 21, 2025
September in Hakodate, Japan offers a delightful climate characterized by a maximum temperature of 28°C (83°F) and an average temperature around 20°C (68°F), making it a pleasant time for outdoor activities. With a minimum temperature dipping to 14°C (57°F), evenings can be refreshingly cool. However, travelers should be prepared for periodic rain, as the city experiences 166 mm (6.5 in) of precipitation over 12 days, coupled with a high humidity level of 89%. This combination of warmth and moisture creates a lush environment, perfect for exploring Hakodate’s stunning natural beauty and vibrant culture.
In September, Hakodate enjoys a delightful warmth as summer transitions into autumn, with temperatures ranging from a mild minimum of 14°C (57°F) to a comfortable maximum of 28°C (83°F). The average temperature settles around 20°C (68°F), making this month a lovely time to explore the city’s vibrant landscapes and rich cultural tapestry. This trend shows a gradual cooling from the peak summer heat of August, where highs can soar to 28°C (83°F), indicating the onset of more temperate days ahead. As the month progresses, residents and visitors alike can relish in the pleasant weather, perfect for sightseeing and outdoor activities before the colder months approach.
In September, Hakodate experiences a noteworthy transition as summer gives way to autumn, reflected in its precipitation patterns. With 166 mm (6.5 in) of rainfall over 12 days, the city is met with a significant dip from the August peak of 254 mm (10.0 in) — a stark reminder of the summer monsoon's intensity. This marks a return to more moderate, yet consistent rainfall, aligning closely with the monthly averages observed in the preceding months of July and October. As the days grow shorter and the temperatures begin to cool, September’s precipitation serves as a bridge, hinting at the impending fall while still retaining a touch of summer's lingering humidity.
In Hakodate, Japan, September experiences a notable humidity level of 89%, marking a slight decrease from the sweltering highs of 97% in August. This month serves as a transition point, as the summer humidity begins to wane, paving the way for the drier autumn months ahead. While the year's peak humidity occurs in July and August, September still retains a significant amount of moisture, reflecting the lingering warmth of the season. As temperatures start to cool down into October, the humidity will drop further, settling around 81%. Overall, September encapsulates the tail end of summer's humidity while hinting at the refreshing changes that autumn will bring.
As summer transitions to fall, September in Hakodate sees a drop in UV Index compared to the peak of August, yet it remains at a significant 8, placing it in the very high exposure category. This means that while the days are getting shorter and the sun less intense, the risk of harm from unprotected sun exposure persists, with a burn time of just 15 minutes. Overall, this month reflects a trend of gradually decreasing UV levels from the extreme heights of summer, making it essential for residents and visitors alike to remain vigilant about sun safety. For detailed information, check out the Hakodate UV Index.
UV Risk Categories
September in Hakodate, Japan, continues to bask in the golden glow of summer with 261 hours of sunshine, a comforting embrace as the vibrant days of August draw to a close. Following the peak of May’s 299 hours, the sunlight begins to wane, yet September outshines the autumn months ahead, promising a blend of warmth and early fall colors. As the year progresses, the trend of diminishing daylight becomes evident, with October's 231 hours marking a noticeable drop. However, September holds a sweet spot, featuring a delightful contrast from the previous summer while still offering a generous amount of sunshine that invites locals and visitors alike to enjoy the last remnants of warm weather before winter’s approach.
As summer fades, September in Hakodate, Japan reveals a notable upswing in sunny days, with a 43% chance of basking in the sun. This marks a significant improvement compared to the summer months, where sunny spells dwindle to as low as 25% in August. Likewise, the transition into autumn mirrors this trend with a comparable likelihood of sunny weather persisting into October. With this promising forecast, September offers a delightful opportunity to enjoy the city's beautiful landscapes under the glow of sunshine, making it an ideal time for outdoor activities before the colder months set in.
As summer gracefully transitions into fall, September in Hakodate heralds a gentle decline in daylight, offering 12 hours of sunlit splendor. This marks a shift from the peak of 15 hours in June, gradually down to 11 hours by October. The month begins with the lingering warmth of summer, reflected in the abundant daylight, but as autumn approaches, each day subtly shortens. This trend emphasizes the rhythmic beauty of seasonal change, allowing residents and visitors alike to enjoy the lingering light of early September while preparing for the cozy embrace of shorter days ahead.
As September arrives in Hakodate, Japan, the winds begin to soften with an average speed of 4.1 m/s (9 mph), reflecting a gentle transition toward autumn. This slight decrease follows the summer peaks of 5.0 m/s (11 mph) in August, marking a shift as the region prepares for cooler days ahead. The winds, once a lively embrace of summer warmth, now take on a more subdued character. The trend of diminishing wind speeds continues into October, where it rises marginally to 4.4 m/s (10 mph), suggesting a gradual reintroduction of brisk breezes as autumn takes hold. Overall, September serves as a calm interlude, where the local scenery flourishes under the soft caress of wind, hinting at the changing seasons.
Weather in Hakodate varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Hakodate, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, temperatures in Hakodate range from a mild 14°C (57°F) to a warm 28°C (83°F), with an average of around 20°C (68°F). The month is characterized by significant precipitation, totaling 166 mm (6.5 in) over 12 days, and high humidity at 89%. In contrast, January presents a starkly different climate, with temperatures plunging to a minimum of -9°C (16°F) and peaking at 8°C (47°F), averaging -1°C (31°F). This winter month sees much less precipitation, about 61 mm (2.4 in) over 13 days, accompanied by lower humidity levels at 79%. For a more detailed look at January weather in Hakodate, visit Hakodate weather in January.
In September, the weather is warm and mild, with temperatures ranging from a minimum of 14°C (57°F) to a maximum of 28°C (83°F), while averaging around 20°C (68°F). This month also sees significant rainfall, with 166 mm (6.5 in) of precipitation spread over 12 days, resulting in high humidity levels of 89%. In contrast, February is much colder, with temperatures dipping to a minimum of -10°C (15°F) and averaging -1°C (30°F), peaking at only 8°C (47°F). Precipitation is lower in February at 79 mm (3.1 in), but it occurs on more days, totaling 14, and the humidity is relatively lower at 78%. This stark contrast between the warm and humid days of September and the chilly, crisp weather of February highlights the seasonal diversity in Hakodate. For more detailed insights, check out Hakodate weather in February.
September in Hakodate is characterized by much warmer temperatures, ranging from a minimum of 14°C (57°F) to a maximum of 28°C (83°F) and an average of 20°C (68°F). The month experiences significant rainfall, with 166 mm (6.5 in) over 12 days, creating a humid atmosphere with an average humidity of 89%. In contrast, March brings a starkly different climate, where temperatures drop significantly, with a minimum of -5°C (23°F) and a maximum of just 12°C (53°F), resulting in an average of only 3°C (38°F). March receives less precipitation, totaling 86 mm (3.4 in) across 11 days, accompanied by lower humidity levels at 77%. For more specific details on conditions in March, you can visit Hakodate weather in March.
When comparing the weather in September and April, it's clear that September features much milder temperatures, with an average of 20°C (68°F) compared to April's cooler average of 7°C (45°F). September enjoys higher maximum temperatures, peaking at 28°C (83°F), while April’s maximum reaches only 14°C (58°F). Precipitation levels are also notable, with September receiving 166 mm (6.5 in) over 12 days, making it wetter than April, which sees 101 mm (4.0 in) over 13 days. Additionally, humidity is higher in September at 89%, compared to April's 78%. For more details on spring weather in that region, check Hakodate weather in April.
When comparing the weather in September and May, September exhibits a significantly warmer climate with average temperatures ranging from a minimum of 14°C to a maximum of 28°C, compared to May's cooler temperatures that span from a minimum of 6°C to a maximum of 20°C. Additionally, September experiences higher humidity levels at 89%, while May maintains a slightly lower humidity at 86%. Precipitation is also more abundant in September, with 166 mm over 12 days, compared to May's 116 mm over 11 days. For those interested in a detailed look at May's weather, please refer to Hakodate weather in May.
September generally offers warmer temperatures compared to June, with average highs reaching 28°C (83°F) as opposed to June's maximum of 21°C (69°F). The minimum temperature in September is also notably higher at 14°C (57°F) compared to June's 9°C (49°F). While both months experience similar precipitation days—12 in total—September sees a larger amount of rainfall at 166 mm (6.5 in) compared to June's 128 mm (5.0 in). Humidity levels remain high in both months, but September is slightly lower at 89% versus June's 91%. For a deeper dive into June's weather specifics, check out Hakodate weather in June.
In comparing the weather between September and July, September tends to be slightly warmer with an average temperature of 20°C (68°F) compared to July's 19°C (67°F). Both months experience a similar range of temperatures, but September peaks at 28°C (83°F), while July reaches a maximum of 27°C (80°F). Precipitation is relatively high in both months, with September receiving 166 mm (6.5 in) over 12 days and July seeing 152 mm (6.0 in) across 16 days. Additionally, humidity levels are higher in July at 95%, compared to September's 89%. For more details on July weather, you can refer to Hakodate weather in July.
In comparing the weather conditions of September to those of August, we find a notable decrease in both temperature and precipitation. September experiences a minimum temperature of 14°C (57°F) and an average of 20°C (68°F), whereas August features slightly warmer temperatures with a minimum of 16°C (61°F) and an average of 21°C (71°F). Although both months have a maximum temperature cap of 28°C (83°F), September has less rainfall, totaling 166 mm (6.5 in) over 12 days compared to August's 254 mm (10.0 in) over 17 days. Humidity also lessens in September to 89%, a relief from the higher humidity of 97% recorded in August. For more details, visit Hakodate weather in August.
September experiences warmer temperatures compared to October, with minimums around 14°C (57°F) and maximums reaching up to 28°C (83°F). In contrast, October sees cooler temperatures, with minimums dropping to 6°C (42°F) and maximums peaking at 23°C (74°F). While both months experience significant rainfall, September has slightly higher precipitation at 166 mm (6.5 in) over 12 days, whereas October receives 149 mm (5.9 in) over 13 days. Humidity levels also decrease from 89% in September to 81% in October, indicating a shift towards crisper fall weather. For more details, check out Hakodate weather in October.
In September, the weather is generally warmer with average temperatures ranging from a minimum of 14°C (57°F) to a maximum of 28°C (83°F), while November sees much cooler conditions, with temperatures dropping to a minimum of -3°C (28°F) and averaging around 8°C (47°F). September also tends to be more humid at 89%, compared to November's 78%, despite both months experiencing precipitation on about 12 to 13 days. While September is characterized by considerable rain, recording 166 mm (6.5 in), November has a milder rainfall total of 103 mm (4.1 in). For more specific insights into November conditions, you can visit Hakodate weather in November.
The weather in September is significantly warmer than in December, with average temperatures around 20°C (68°F) compared to just 2°C (35°F) in December. While September experiences more considerable warmth, it also brings higher humidity levels at 89% and substantial rainfall of 166 mm (6.5 in) over 12 days. In contrast, December sees a drop in both temperature and precipitation, with only 89 mm (3.5 in) of rain over 18 days, and humidity levels cool down to 77%. For more information, you can explore Hakodate weather in December.
As September unfolds in Hakodate, the weather presents a delightful transition from the warm summer days to the crisp embrace of autumn. With average temperatures settling around a mild 20°C (68°F), this month is characterized by increased humidity and a fair share of rainfall, making it notably wetter compared to the preceding months. With 12 rainy days and a total precipitation of 166 mm (6.5 in), visitors can expect a refreshing, albeit slightly unpredictable climate. This blend of warmth and moisture not only enhances the lush scenery but also prepares the landscape for the vibrant autumn colors ahead. For a deeper dive into year-round conditions, check out Hakodate Climate.