Last updated: August 21, 2025
In Shimonoseki, Japan, January showcases a climate marked by moderately cool temperatures, peaking at a pleasant 17°C (64°F) and averaging around 8°C (46°F). The month can dip to a chilly -1°C (30°F), especially during colder nights. With a total precipitation of 84 mm (3.3 in) spread over approximately 12 days, January brings frequent but light rain, contributing to a humid atmosphere with an average humidity level of 76%. This combination of mild weather and consistent precipitation makes January a unique time to experience Shimonoseki's winter charm.
In January, Shimonoseki experiences a chilly embrace, with temperatures ranging from a brisk -1°C (30°F) at night to a mild 17°C (64°F) during the day. The average temperature hovers around 8°C (46°F), marking the start of the year with a refreshing coolness. As the month progresses into February, conditions remain consistent, with similarly low nighttime lows and slightly warmer daytime highs. However, a subtle shift emerges in March, as the air begins to warm, welcoming a minimum of 4°C (39°F) and an increase in average daily temperatures to 11°C (52°F). This gradual warming trend continues into the spring months, setting the stage for the more temperate conditions of April and May. Overall, Shimonoseki's January weather reflects a crisp transition as winter holds on, yet hints at the approaching warmth of spring.
In January, Shimonoseki experiences a moderate precipitation level, with an average of 84 mm (3.3 in) falling over approximately 12 days. This marks a subtle increase in moisture compared to December’s 89 mm (3.5 in), suggesting a gradual transition into wetter months ahead. February follows closely with 93 mm (3.6 in) of rain over 11 days, continuing the trend of steadily increasing precipitation. As winter gives way to spring, the city can expect more pronounced rainfalls, culminating in a peak during the summer months, where average precipitation surges significantly. This gradual escalation from the calm of January sets the stage for the lush, vibrant landscape that characterizes Shimonoseki in the warmer seasons.
In Shimonoseki, Japan, January ushers in the year with a relatively high humidity level of 76%. This moisture-laden air sets the tone for the winter months, where humidity remains consistently above 70%, peaking in the summer. As January transitions to milder February, humidity dips slightly to 72% before stabilizing in the 70s and 80s through spring and into the sultry summer months. May witnesses a noticeable climb to 84%, while July and August experience a striking peak at 95% and 93%, respectively. This trend of escalating humidity reflects the region’s warm, humid summer climate, followed by a gradual decline into the fall, eventually returning to 76% in November. Thus, Shimonoseki's January humidity not only plays a role in the winter ambiance but also foreshadows the humid days that lie ahead, creating a cyclical rhythm of moisture throughout the year.
In January, Shimonoseki experiences a moderate UV Index of 4, with a burn time of 30 minutes. As winter transitions into spring, UV levels steadily rise, hitting 5 in February and then surging to 8 in March, reflecting a shift to a very high exposure category. This upward trend continues into April, where the index peaks at 10, accompanied by a reduced burn time of just 15 minutes. By May and June, the index reaches extreme levels of 11, with the time to burn dropping further to a mere 10 minutes in the height of summer. Interestingly, July and August maintain this intensity before the UV Index begins to decline in September, returning to a very high level of 10. As the year winds down, October sees a high exposure category with an index of 7 and 25 minutes burn time, before tapering off to moderate levels in November and December. For more detailed information, check out the full Shimonoseki UV Index.
UV Risk Categories
In Shimonoseki, Japan, the new year begins with a modest 178 hours of sunshine in January, setting a gentle tone for the month. As winter transitions to spring, the hours of sunlight steadily increase, peaking at 280 hours in April. This gradual ascent reflects the shift toward warmer days, inviting the vibrant blooms of May, which bask in 303 hours of sunlight. The summer months of June through August continue this trend, with sunshine reaching its zenith at 305 hours in August. However, as autumn arrives, the days shorten, leading to a gradual decline, with September offering 256 hours and a continued waning into the winter months, ultimately closing the year with 215 hours in December. This rhythmic dance of sunshine not only characterizes the seasonal changes in Shimonoseki but also shapes the region’s unique charm throughout the year.
In Shimonoseki, Japan, the likelihood of sunny weather in January hovers at around 30%, marking one of the quieter months for sunshine. This percentage sets the stage for a notable increase in sun-filled days as the year progresses, with February showing a promising 44% chance, followed by a slight dip in March at 36%. As spring approaches, April brings a welcoming surge to 46%, while May and June witness a slight decline to 34% and 31%, respectively. The summer months, however, unveil a dramatic reduction, particularly in July and August, where sunny days drop to 24% and 27%. Interestingly, as autumn rolls in, the chances rebound significantly, cresting to 59% in October. This trend emphasizes that while January may not offer the brightest start, the following months promise a more vibrant and sunlit atmosphere as the season transitions.
In Shimonoseki, Japan, January sees approximately 10 hours of daylight, a figure that remains consistent through February. As spring approaches in March, the days gradually lengthen to 11 hours, setting the stage for a significant increase as April brings 13 hours of sunlight. This trend continues through May and into June, where residents enjoy up to 14 hours of daylight, maximizing outdoor activities during the warmest months. Following the height of summer, daylight begins to taper off, with August still boasting 13 hours before dropping to 12 hours in September. The transition into autumn sees a gradual decline, with daylight dwindling to 10 hours by November, and December closes the year with the shortest duration at just 9 hours. This rhythm of longer days in the warmer months and shorter days in winter characterizes the seasonal daylight experience in Shimonoseki.
In Shimonoseki, Japan, January ushers in a brisk average wind speed of 6.5 m/s (15 mph), setting the tone for the winter months. This invigorating breeze slightly increases in February, reaching 6.7 m/s (15 mph), before tapering off to 5.6 m/s (12 mph) in March and April. As spring approaches, the winds continue to calm, dropping to a gentle 5.0 m/s (11 mph) in May. The summer months of June and July are characterized by even milder breezes, with speeds decreasing to around 4.0–4.2 m/s (9-10 mph). However, as autumn rolls in, the winds regain a bit of their strength, peaking again at 5.7 m/s (13 mph) in November and holding steady at 6.4 m/s (14 mph) in December. This pattern reflects a consistent cycle, where the winds are at their strongest during the colder months and gradually soften as the seasons shift towards summer.
Weather in Shimonoseki varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Shimonoseki, focusing on differences in temperature, rainfall, humidity, and UV levels.
In January, the weather typically features temperatures ranging from a minimum of -1°C (30°F) to a maximum of 17°C (64°F), with an average temperature of 8°C (46°F). This month experiences around 84 mm (3.3 inches) of precipitation over 12 days, accompanied by a humidity level of 76%.
In contrast, February sees a slightly warmer maximum temperature of 18°C (65°F) while maintaining a consistent minimum of -1°C (31°F) and the same average of 8°C (46°F). Precipitation increases slightly to 93 mm (3.6 inches) across 11 days, with humidity dropping to 72%. For more detailed information about February weather, check out Shimonoseki weather in February.
In January, Shimonoseki experiences colder temperatures, with average highs reaching 17°C (64°F) and lows dipping to -1°C (30°F). The month is characterized by relatively high humidity at 76% and precipitation totals around 84 mm (3.3 in) over 12 days. In contrast, March brings milder weather, with an average high of 18°C (64°F) and a minimum temperature of 4°C (39°F). However, it sees an increase in rainfall, totaling 165 mm (6.5 in) over the same number of wet days, while humidity decreases to 69%. For more detailed insights, you can check Shimonoseki weather in March.
In January, the weather tends to be quite cold, with temperatures ranging from a minimum of -1°C (30°F) to a maximum of 17°C (64°F) and an average temperature of 8°C (46°F). The month also sees notable precipitation, totaling 84 mm (3.3 in) over 12 days, along with a humidity level of 76%.
In contrast, April brings milder conditions, with a minimum temperature of 7°C (45°F), an average of 14°C (58°F), and a maximum of 22°C (71°F). This month is wetter, experiencing 129 mm (5.1 in) of precipitation over 10 days, while the humidity slightly decreases to 75%. For more detailed information, visit Shimonoseki weather in April.
In January, the weather is quite cool, with temperatures ranging from a minimum of -1°C (30°F) to a maximum of 17°C (64°F), while average temperatures hover around 8°C (46°F). This month also sees significant precipitation, totaling 84 mm (3.3 in) over approximately 12 days, amidst a relatively high humidity level of 76%.
In contrast, May brings a noticeable warmth, with temperatures starting at a minimum of 12°C (54°F) and peaking at 25°C (77°F), with an average temperature of 18°C (65°F). Although May experiences more precipitation at 141 mm (5.5 in) over just 10 days, it also has a slightly higher humidity of 84%. For more detailed information, you can check Shimonoseki weather in May.
In January, the weather is quite cool, with temperatures ranging from a minimum of -1°C (30°F) to a maximum of 17°C (64°F), and an average of around 8°C (46°F). The month sees relatively moderate precipitation of 84 mm (3.3 in) over 12 days, along with a humidity level of 76%. In contrast, June experiences much warmer temperatures, with a minimum of 16°C (62°F) and a maximum of 27°C (81°F), averaging 21°C (71°F). However, it also brings more rainfall, with 194 mm (7.7 in) of precipitation over 11 days and a higher humidity of 88%. For more details on June weather, you can visit Shimonoseki weather in June.
In January, the weather tends to be quite chilly, with temperatures ranging from a minimum of -1°C (30°F) to a pleasant average of 8°C (46°F), and peaking at 17°C (64°F). This month experiences around 84 mm (3.3 in) of precipitation over approximately 12 days, with a humidity level of 76%. In contrast, July brings a stark shift, characterized by much warmer temperatures that range from a minimum of 20°C (69°F) to an average of 25°C (78°F), and a maximum of 31°C (88°F). The summer month sees a significantly higher precipitation level of 295 mm (11.6 in) spread over about 16 days and an increased humidity of 95%. For more details on the temperature and conditions in July, visit Shimonoseki weather in July.
In January, the weather is markedly cooler, with temperatures ranging from a minimum of -1°C (30°F) to a maximum of 17°C (64°F) and an average temperature of 8°C (46°F). This month also sees relatively low precipitation of 84 mm (3.3 in) over about 12 days, accompanied by a humidity level of 76%. In stark contrast, August experiences much warmer conditions, with temperatures soaring from a minimum of 21°C (69°F) to a peak of 32°C (89°F) and an average of 27°C (81°F). Precipitation is significantly higher in August, totaling 251 mm (9.9 in) over 13 days, and humidity rises to 93%. For more details on the weather conditions in August, you can visit Shimonoseki weather in August.
January and September present strikingly different weather patterns. In January, temperatures range from a chilly minimum of -1°C (30°F) to a mild maximum of 17°C (64°F), with an average of 8°C (46°F). The month sees about 84 mm (3.3 in) of precipitation over 12 days, accompanied by a humidity level of 76%. In contrast, September boasts much warmer temperatures, with a minimum of 18°C (65°F), an average of 24°C (76°F), and a high of 32°C (89°F). However, the month is also characterized by significantly higher rainfall, totaling 226 mm (8.9 in) over the same number of rainy days, while humidity rises to 84%. For more specific details on September weather, visit Shimonoseki weather in September.
In January, the weather is noticeably cooler, with minimum temperatures dropping to -1°C (30°F) and an average of 8°C (46°F), whereas October enjoys a much milder climate, featuring minimum temperatures around 14°C (57°F) and an average of 20°C (68°F). While January experiences about 84 mm (3.3 in) of precipitation over 12 days, October sees a slightly higher total of 121 mm (4.7 in) over 11 days, suggesting more substantial rain but spread out over fewer days. Humidity levels are relatively similar, with January at 76% and October at 79%. For more specific details about October weather, you can check out Shimonoseki weather in October.
January weather contrasts significantly with that of November. In January, temperatures range from a chilly minimum of -1°C (30°F) to a mild maximum of 17°C (64°F), with an average of 8°C (46°F). This month also experiences higher precipitation, totaling 84 mm (3.3 in) over 12 days, contributing to a cold and damp atmosphere with consistent humidity at 76%. In comparison, November offers a more temperate climate, with minimum temperatures around 8°C (46°F) and maximums peaking at 23°C (74°F), averaging 15°C (59°F). It is notably drier, receiving only 54 mm (2.1 in) of rain over 8 days, yet maintains the same humidity level of 76%. For more details, check out Shimonoseki weather in November.
January tends to be slightly cooler than December, with average temperatures ranging from a minimum of -1°C (30°F) to a maximum of 17°C (64°F), compared to December's minimum of 1°C (34°F) and maximum of 20°C (68°F). Both months experience similar levels of precipitation, with January receiving 84 mm (3.3 in) and December recording 89 mm (3.5 in), each spread across approximately 12 days. Humidity levels are comparable as well, with January at 76% and December at 75%. For more details on December's climate, you can check Shimonoseki weather in December.
In January, Shimonoseki experiences a notable shift in weather compared to the milder months of spring and late autumn. With chilly temperatures averaging around 8°C, it's a time when the city feels the embrace of winter, marked by brisk winds and increased humidity levels of 76%. This month brings about an uptick in precipitation, resulting in about 12 soggy days, making it one of the wetter periods of the year. While the scenery transforms under the overcast skies, those exploring the region can appreciate the unique beauty and quieter ambiance that January offers. For more insights into the seasonal variations, explore the detailed information on Shimonoseki Climate.