Last updated: August 21, 2025
May in Shimonoseki, Japan offers a pleasant climate characterized by temperatures ranging from a comfortable 12°C (54°F) to a warm 25°C (77°F), with an average of 18°C (65°F). This month is marked by an average humidity of 84%, creating a lush environment. However, prepare for the occasional showers, as 141 mm (5.5 in) of precipitation is spread over 10 days. Despite the rain, May provides a vibrant backdrop for exploration and outdoor activities in this picturesque coastal city.
In May, Shimonoseki, Japan, transitions into a more vibrant spring, showcasing a noticeable warming trend. The minimum temperatures rise to a comfortable 12°C (54°F), while the average settles at a pleasant 18°C (65°F), peaking at a delightful 25°C (77°F). This month marks a significant shift from the preceding cooler months, reflecting the gradual approach of summer. As the city sheds its winter chill, May invites outdoor activities and blooming landscapes, making it an ideal time to explore. The pleasant warmth, coupled with the refreshing atmosphere, sets the stage for a beautiful spring experience in Shimonoseki.
In May, Shimonoseki experiences a moderate 141 mm (5.5 in) of precipitation, making it one of the wetter months leading into the rainy season. With rainfall occurring over about 10 days, the city sees a consistent yet manageable amount of wet weather, setting the stage for the ideal growth of lush greenery. Compared to April's 129 mm (5.1 in), May represents a slight increase, highlighting a gradual trend of rising precipitation as summer approaches. This upward shift in rainfall continues into June, where totals leap to 194 mm (7.7 in). As the months progress, Shimonoseki transitions from the gentler rains of spring to the heavier downpours typical of the summer months, embodying the dynamic climate of this picturesque region in Japan.
May ushers in a notable surge in humidity in Shimonoseki, Japan, with levels reaching 84%. This increase marks a considerable uptick from the preceding months, where humidity figures hovered between 69% and 76%. As spring transitions into summer, the air becomes noticeably more moisture-laden, setting the stage for the impending peak of summer humidity that can soar to 95% in July. This upward trend highlights May as a transitional month, where the comfort of spring gives way to the sultriness that characterizes the warmer months ahead. As Shimonoseki embraces the lushness of May, the heightened humidity creates an environment ripe for vibrant flora and a lively atmosphere, welcoming the full bloom of the season.
In May, Shimonoseki experiences a significant surge in UV intensity, with the UV Index soaring to 11, categorizing it as extreme. This translates to a minimal burn time of just 10 minutes, urging locals and visitors alike to take protective measures against the sun’s powerful rays. This drastic increase follows a series of months where the UV Index gradually climbed from a moderate 4 in January to a very high 10 in April. As the weather warms, maintaining an awareness of these rising values is crucial for skin safety. With June continuing at the same extreme level, it’s essential to stay informed about the UV Index throughout the month. For more detailed information, visit Shimonoseki UV Index.
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As spring blossoms into summer, Shimonoseki basks in an impressive 303 hours of sunshine in May. This month marks a vibrant peak in the annual sunshine trend, contrasting beautifully with the earlier winter months, where sunlight was scarce—just 178 hours in January. From February's 229 hours onwards, the increase becomes noticeable, with each month escalating toward May's brilliance. After this peak, sunlight slightly ebbs into June and July, suggesting a gradual transition as the weather warms. Notably, the sun-drenched days of August, matching May’s joy at 305 hours, remind us that Shimonoseki continues to embrace the sunny palette of summer while hinting at a gentle decline toward fall as September settles into cooler temperatures.
May in Shimonoseki, Japan, brings a 34% chance of sunny weather, reflecting a slight dip from the vibrant spring months of April, which enjoys a 46% likelihood of sunshine. This modest probability indicates that while residents and visitors can expect milder days, they should still be prepared for unpredictable weather. As we transition into June, the chance of sunny days decreases further to 31%, suggesting that the region is shifting towards a more humid and rainy season. Overall, while May may not stand out for guaranteed sunshine, it retains a charm that is characteristic of late spring in this picturesque locale.
In Shimonoseki, Japan, the progression of daylight hours reveals a fascinating seasonal rhythm. As winter fades away, January and February bask in a modest 10 hours of daylight, gradually increasing to 11 hours in March. This gentle ascendancy continues into April, where the days stretch to 13 hours, setting the stage for May, which maintains this vibrant duration. The arrival of June and July brings the longest days of the year, peaking at 14 hours of daylight, ideal for outdoor activities. As summer wanes, daylight begins to recede, with August witnessing a slight dip to 13 hours. By September, the daylight hours decrease to 12, before further shortening in October and November. Finally, December concludes the year with a mere 9 hours of sunlight, encapsulating the cyclical nature of daylight throughout the year in this captivating locale.
In Shimonoseki, Japan, the winds of May tend to calm down compared to the gustier months of winter and early spring. With an average wind speed of 5.0 m/s (11 mph), May marks a gentle transition into summer, as the winds gradually taper from the more robust 6.5 m/s in January to under 5 m/s this month. This slight decrease reflects a broader trend that sees wind speeds plateauing in the warmer months, often drifting around the 4 to 5 m/s range from May through August before picking up again in November. Overall, May’s soft breezes create a serene atmosphere, perfect for enjoying the blossoming scenery of spring in this beautiful coastal city.
Weather in Shimonoseki varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Shimonoseki, focusing on differences in temperature, rainfall, humidity, and UV levels.
In Shimonoseki, May presents a warm and vibrant climate with temperatures ranging from a minimum of 12°C (54°F) to a maximum of 25°C (77°F) and an average of 18°C (65°F). However, it also sees considerable precipitation, with around 141 mm (5.5 in) falling over approximately 10 days, contributing to a high humidity level of 84%. In contrast, January experiences much cooler temperatures, with a range from a minimum of -1°C (30°F) to a maximum of 17°C (64°F), averaging around 8°C (46°F). Although January experiences less precipitation at 84 mm (3.3 in), it does so over 12 days, resulting in a slightly lower humidity of 76%. For more detailed insights on January weather, you can visit Shimonoseki weather in January.
When comparing the weather in May and February, it’s clear that May offers significantly warmer temperatures, with a minimum of 12°C (54°F) and an average of 18°C (65°F), while February experiences much cooler conditions, with a minimum of -1°C (31°F) and an average of 8°C (46°F). The maximum temperature in May can reach as high as 25°C (77°F), whereas February tops out at 18°C (65°F). Additionally, May sees a higher level of precipitation at 141 mm (5.5 in) over 10 days, compared to February's 93 mm (3.6 in) over 11 days, though February has lower humidity at 72% versus May's 84%. For a more detailed look at the weather during February, check out Shimonoseki weather in February.
In March, the weather tends to be cooler with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 18°C (64°F), compared to the milder May temperatures which span from a minimum of 12°C (54°F) to a maximum of 25°C (77°F). March also experiences slightly more precipitation, totaling 165 mm (6.5 in) over 12 days, while May receives 141 mm (5.5 in) across 10 days. Additionally, the humidity levels in May are higher at 84%, contrasting with the 69% average in March, creating a more humid atmosphere as spring progresses. For more details, you can check Shimonoseki weather in March.
In comparing the weather of April and May, May shows a notable increase in both temperature and humidity. With average temperatures ranging from a minimum of 12°C (54°F) to a maximum of 25°C (77°F), May is warmer than April, which has an average that peaks at 22°C (71°F). Additionally, May experiences slightly more rainfall, totaling 141 mm (5.5 in) compared to April's 129 mm (5.1 in), despite both months having precipitation on 10 days. The humidity also rises in May to 84%, up from April's 75%, contributing to a more sultry atmosphere. For a closer look at April's weather specifics, check out Shimonoseki weather in April.
May and June exhibit a notable shift in weather patterns. In May, temperatures range from a minimum of 12°C (54°F) to a maximum of 25°C (77°F), with an average of 18°C (65°F). This month experiences about 141 mm (5.5 in) of precipitation over 10 days, accompanied by a humidity level of 84%. In contrast, June sees warmer conditions, with temperatures starting at a minimum of 16°C (62°F) and peaking at 27°C (81°F), averaging 21°C (71°F). The month is wetter, with precipitation rising to 194 mm (7.7 in) across 11 days and slightly increased humidity at 88%. For more details on June weather, you can visit Shimonoseki weather in June.
In May, the weather tends to be mild, with temperatures ranging from a minimum of 12°C (54°F) to a maximum of 25°C (77°F) and an average of 18°C (65°F). Rainfall is moderate, with around 141 mm (5.5 in) spread over 10 days, and humidity levels at 84%. By July, the temperature rises significantly, with minimums around 20°C (69°F) and maximums peaking at 31°C (88°F), averaging 25°C (78°F). However, July experiences much more rainfall, totaling 295 mm (11.6 in) over 16 days, and the humidity climbs to a steamy 95%. For a detailed look at the weather in July, check out Shimonoseki weather in July.
In comparing the weather in May and August, it's clear that August is significantly warmer and more humid. In May, temperatures range from a minimum of 12°C (54°F) to a maximum of 25°C (77°F), with an average of 18°C (65°F) and humidity levels at 84%. On the other hand, August experiences warmer temperatures, with a minimum of 21°C (69°F), an average of 27°C (81°F), and a high of 32°C (89°F). Additionally, August tends to be wetter, receiving 251 mm (9.9 inches) of rainfall over 13 days, compared to May's 141 mm (5.5 inches) over 10 days. For more details, you can check out Shimonoseki weather in August.
May and September present distinct weather patterns that highlight the transition between spring and fall. In May, temperatures range from a minimum of 12°C (54°F) to a maximum of 25°C (77°F), with an average around 18°C (65°F). The month experiences around 141 mm (5.5 in) of precipitation over approximately 10 days, accompanied by a humidity level of 84%. In contrast, September offers warmer conditions, with temperatures ranging from 18°C (65°F) at its lowest to highs of 32°C (89°F), averaging 24°C (76°F). This month sees increased rainfall, totaling 226 mm (8.9 in) across about 12 days, while maintaining the same humidity level of 84%. For a more detailed overview, you can check Shimonoseki weather in September.
In May, the weather is generally cooler with temperatures ranging from a minimum of 12°C (54°F) to a maximum of 25°C (77°F), averaging around 18°C (65°F). During this month, Shimonoseki experiences higher humidity at 84% and receives a significant amount of precipitation, totaling 141 mm (5.5 in) over about 10 days. In contrast, October offers slightly warmer temperatures with a minimum of 14°C (57°F) and a maximum of 27°C (82°F), averaging 20°C (68°F). While October sees only a marginally lower total precipitation of 121 mm (4.7 in) across 11 days, the humidity decreases to 79%. For more details, check out Shimonoseki weather in October.
May and November present distinctly different weather patterns. In May, temperatures range from a minimum of 12°C (54°F) to a maximum of 25°C (77°F), with an average of 18°C (65°F), while November's temperatures vary from a lower minimum of 8°C (46°F) to a peak of 23°C (74°F), averaging 15°C (59°F). Additionally, May experiences significantly more precipitation, totaling 141 mm (5.5 in) over about 10 days, compared to November’s 54 mm (2.1 in) over just 8 days. The humidity is also higher in May at 84%, while November sees a slight decrease to 76%. For more specifics on November weather, you can check Shimonoseki weather in November.
May and December present strikingly different weather patterns. In May, temperatures range from a mild 12°C (54°F) to a warm 25°C (77°F), with an average of 18°C (65°F). The month is also characterized by higher humidity at 84% and a total precipitation of 141 mm (5.5 in) over approximately 10 days, making it feel quite lush and vibrant. In contrast, December experiences considerably cooler temperatures, with a minimum of 1°C (34°F), an average of 10°C (50°F), and a maximum of 20°C (68°F). While it has a lower total precipitation of 89 mm (3.5 in) spread over 12 days, the humidity drops to 75%, resulting in a drier feel compared to May. For a closer look at December weather specifics, check out Shimonoseki weather in December.
As May unfolds in Shimonoseki, the city experiences a refreshing shift with mild temperatures and a noticeable increase in humidity, creating a vibrant atmosphere. Unlike the cooler months that precede it, May typically showcases more pleasant weather, with pleasant days beckoning outdoor activities and exploration. While occasional rainfall can be expected, the overall climate is markedly more inviting than the chill of previous months. To learn more about the weather and how it complements your travel plans, check out Shimonoseki Climate.