Last updated: August 21, 2025
January in Hiroshima, Japan, presents a cool and often damp atmosphere, with maximum temperatures reaching 14°C (58°F) and an average of 4°C (39°F). The month experiences a notable chill, as lows can drop to -7°C (20°F), making warm layers essential for outdoor activities. With 54 mm (2.1 in) of precipitation spread across 9 days, the humidity levels are relatively high at 76%, adding to the overall winter ambience. This combination of cool temperatures and frequent showers contributes to the picturesque winter landscape that characterizes Hiroshima in January, inviting visitors to explore its serene beauty while bundled up against the cold.
In January, Hiroshima’s temperatures are characterized by a noticeable chill, with lows dipping to -7°C (20°F) and an average of 4°C (39°F). As winter settles in, visitors can expect daytime highs reaching up to 14°C (58°F), providing a cool but manageable climate. This trend of cold mornings and slightly warmer afternoons continues into February, where temperatures remain similar but hint at the gradual arrival of spring. As the months progress towards March, the temperatures begin to rise, foreshadowing the arrival of milder weather. Overall, January serves as a brisk introduction to winter in Hiroshima, where the cold gradually gives way to the more temperate days of spring.
In January, Hiroshima experiences a moderate precipitation level of 54 mm (2.1 in) over approximately 9 days, marking the onset of a wetter season. The rainfall begins to rise steadily in February, hitting 67 mm (2.6 in), and continues to increase as spring approaches, reaching 120 mm (4.7 in) in March and 128 mm (5.0 in) in April. This upward trend underscores the shift towards Japan's rainy season as temperatures warm. Interestingly, the number of precipitation days remains relatively steady during these initial months, evidencing consistent rainfall patterns. As summer sets in, precipitation peaks dramatically in July with 391 mm (15.4 in), illustrating the region's transition into a much wetter climate, before tapering off in the following months. Overall, January serves as a precursor to the more intense rainfall that characterizes the ensuing months in Hiroshima.
In Hiroshima, Japan, January greets residents with a moderate humidity level of 76%, setting the tone for the winter months. As the year progresses, a noticeable decline in humidity occurs, dipping to 72% in February and further to 69% in March, marking a brief respite before the environment shifts. From April onwards, humidity begins to rise again, peaking dramatically in the summer months, with July reaching a sweltering 95%. The trend continues with August at 93%, before a gradual decline begins in September. By the end of the year, humidity stabilizes around 76% in November and 75% in December, showcasing a cycle of rising and falling moisture that significantly defines Hiroshima's climate throughout the year.
In January, Hiroshima experiences a moderate UV Index of 4, with a burn time of 30 minutes, indicating that while sun protection is necessary, risks remain relatively low. As the month transitions into February, the UV Index increases slightly to 5, still categorized as moderate. However, as spring approaches, a significant jump occurs in March, where the UV Index skyrockets to 8, transitioning to the very high exposure category and reducing safe sun exposure time to just 15 minutes. The pattern continues, peaking in the summer months with an extreme UV Index of 12 from July to August, emphasizing the importance of diligent sun protection during this time. Overall, the data illustrates a distinct seasonal shift in UV intensity, highlighting a sharp increase from winter to summer, urging residents and visitors alike to remain vigilant about sun safety. For more detailed information, check out Hiroshima UV Index.
UV Risk Categories
In Hiroshima, January welcomes the year with a serene 184 hours of sunshine, setting a contemplative tone for the months ahead. As winter gives way to spring, the city basks in gradually increasing sunlight, with February bringing 227 hours and March peaking at 266 hours. The warmth of spring truly blossoms in April, reaching 282 hours, before May shines the brightest at 303 hours. The summer months maintain a robust glow, with August standing out at 308 hours, perfect for outdoor adventures. However, as autumn arrives, a gentle decline begins; sunlight hours decrease to 260 in September, followed by 254 in October, and so forth, eventually wrapping up the year with a cozy 220 hours in December. This ebb and flow of sunshine not only reflects the changing seasons but also paints a vibrant picture of Hiroshima's dynamic climate throughout the year.
In Hiroshima, January brings a 38% chance of sunny weather, marking a relatively modest start to the year compared to the sunnier months that follow. As winter transitions into spring, February offers an uptick to 48%, hinting at brighter days ahead. However, the likelihood of sunshine fluctuates throughout the spring months, with March dipping slightly to 37% before rising again in April to 46%. Interestingly, the summer months see a significant drop, with July and August hovering around 22% to 25%, indicating a shift towards more humid and overcast conditions. As we approach autumn, the sun starts to make a comeback, with October reaching a sunny 56%, demonstrating a notable trend of increasing sunny days as the year closes.
In Hiroshima, Japan, January ushers in a brisk start to the year with 10 hours of daylight, a trend that continues into February. As spring approaches, March sees a slight increase to 11 hours, paving the way for longer days ahead. By April and May, daylight reaches its peak at 13 hours, offering residents ample sunlight to enjoy the blossoming surroundings. As the summer months arrive, June and July extend the daylight further to an impressive 14 hours, bathing the city in warmth. However, as the year wanes, a gradual decline begins; August retains 13 hours, but by September, that number drops to 12, and October sees it slide further to 11 hours. As December settles in, daylight dwindles to 9 hours, marking a return to the cozy, early-night vibes of winter. This rhythmic ebb and flow of daylight encapsulates the seasonal transformations in Hiroshima, inviting both reflection and appreciation for the changing landscape.
In January, Hiroshima experiences a gentle average wind speed of 2.8 m/s (6 mph), setting the tone for a calm winter month. This slight breeze is indicative of the overall trend seen throughout the winter season, where winds remain relatively mild with only a slight uptick in February to 3.0 m/s (7 mph). As spring approaches, the winds begin to shift slightly, dropping to 2.6 m/s (6 mph) in both March and April. Consistency reigns during the late spring and early summer months, with average speeds stabilizing around 2.6 m/s. Yet, as the summer peaks in June, the winds calm down significantly, reaching their lowest point at 1.8 m/s (4 mph). Interestingly, while July and August see slight increases, they remain subdued compared to earlier months. The transition to autumn brings winds back to a more brisk pace, peaking again in November before closing out the year with another 3.0 m/s in December. The overall trend showcases a distinct seasonal rhythm, with winter and early spring offering soft, consistent breezes, contrasting with the lighter, more variable winds of summer.
Weather in Hiroshima varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Hiroshima, focusing on differences in temperature, rainfall, humidity, and UV levels.
In January, temperatures in Hiroshima range from a minimum of -7°C (20°F) to a maximum of 14°C (58°F), with an average temperature of 4°C (39°F). The month experiences approximately 54 mm (2.1 in) of precipitation over 9 days and maintains a humidity level of 76%. In contrast, February sees slightly warmer temperatures, with a minimum of -7°C (19°F), an average of 5°C (41°F), and a maximum of 20°C (69°F). Precipitation increases to 67 mm (2.6 in) over the same number of days, though humidity dips slightly to 72%. For more detailed information, visit Hiroshima weather in February.
In January, the weather is notably chillier, with temperatures ranging from a minimum of -7°C (20°F) to a maximum of 14°C (58°F) and an average of around 4°C (39°F). This month typically experiences 54 mm (2.1 in) of precipitation across approximately 9 days, accompanied by a humidity level of 76%. In contrast, March brings a significant warming trend, with temperatures fluctuating between -2°C (29°F) and a pleasant 22°C (71°F), and an average of 9°C (48°F). However, March has more precipitation overall, totaling 120 mm (4.7 in) across 12 days, and slightly lower humidity at 69%. For more specific details about the weather in Hiroshima during March, check out Hiroshima weather in March.
The weather in January is characterized by colder temperatures, with a minimum of -7°C (20°F) and an average of 4°C (39°F), while April brings a significant warming trend, featuring a minimum temperature of -1°C (31°F) and an average of 13°C (56°F). January experiences relatively light precipitation, totaling 54 mm (2.1 in) over 9 days, whereas April sees a notable increase in rainfall, with 128 mm (5.0 in) also spread across 9 days. Humidity levels are quite similar between the two months, at 76% in January and 75% in April, but the overall feel is noticeably different as spring emerges. For more details on the specific weather patterns in April, check out Hiroshima weather in April.
In January, the weather is quite chilly, with temperatures ranging from a minimum of -7°C (20°F) to a maximum of 14°C (58°F), and an average temperature of 4°C (39°F). The month experiences 54 mm (2.1 in) of precipitation over approximately nine days, accompanied by a humidity level of 76%. In contrast, May brings significantly warmer weather, with temperatures ranging from a minimum of 5°C (42°F) to a comfortable maximum of 30°C (86°F), averaging around 18°C (65°F). The precipitation increases to 121 mm (4.8 in) also over nine days, but the humidity slightly rises to 84%. The shift from January to May illustrates a transition from cold, damp winter conditions to a warmer and more humid spring climate. For a more in-depth look at the weather during this time, you can check out Hiroshima weather in May.
January and June in Hiroshima present stark contrasts in weather. January features colder temperatures, with a minimum of -7°C (20°F) and an average of 4°C (39°F), while June enjoys much milder conditions, with lows around 11°C (52°F) and an average high of 21°C (71°F). Precipitation is more frequent in June, with 177 mm (7.0 in) falling over 14 days compared to January's 54 mm (2.1 in) over 9 days. Humidity levels also elevate in June, reaching 88% compared to January’s 76%. For more details on June weather in Hiroshima, visit Hiroshima weather in June.
In January, the weather in Hiroshima is characterized by chilly temperatures, with averages around 4°C (39°F) and nighttime lows dropping to -7°C (20°F). The humidity is moderate at 76%, and the region experiences about 54 mm (2.1 in) of precipitation over 9 days. Conversely, July brings a dramatic warmth and humidity, with average temperatures soaring to 26°C (78°F) and highs reaching up to 35°C (96°F). The summer month also sees significantly higher precipitation, totaling 391 mm (15.4 in) over 19 days, accompanied by a high humidity level of 95%. For more detailed information, check out Hiroshima weather in July.
In January, the weather in Hiroshima is characterized by chilly temperatures, with a minimum of -7°C (20°F) and an average of 4°C (39°F), peaking at a maximum of 14°C (58°F). The month experiences relatively low precipitation levels, totaling 54 mm (2.1 in) over 9 days, and a humidity level of 76%. In contrast, August brings a dramatic shift, with temperatures ranging from a minimum of 17°C (63°F) to a scorching average of 27°C (81°F), reaching highs of 36°C (97°F). August also sees significantly more rainfall, accumulating 257 mm (10.1 in) over 14 days, accompanied by higher humidity at 93%. For a more detailed look at the weather in August, visit Hiroshima weather in August.
In January, the weather is quite cold, with temperatures ranging from a minimum of -7°C (20°F) to a maximum of 14°C (58°F). The month experiences an average temperature of around 4°C (39°F) and a total precipitation of 54 mm (2.1 in) over about 9 days, accompanied by a moderate humidity of 76%. In contrast, September brings significantly warmer conditions, with temperatures varying from a minimum of 12°C (54°F) to a high of 33°C (92°F), culminating in an average temperature of 23°C (73°F). However, September is also much wetter, recording 230 mm (9.1 in) of precipitation over 14 days and higher humidity at 84%. For more detailed insights, check out Hiroshima weather in September.
January and October present stark contrasts in weather conditions. In January, temperatures range from a chilly -7°C (20°F) to a maximum of 14°C (58°F), averaging around 4°C (39°F), accompanied by considerable humidity at 76%. Precipitation is relatively low at 54 mm (2.1 in) over about 9 days. In comparison, October boasts much milder temperatures, with minimums of 5°C (41°F) and highs reaching 28°C (84°F), averaging a pleasant 17°C (63°F). The month also brings significantly more rainfall, totaling 164 mm (6.5 in) over 11 days, and slightly higher humidity at 79%. For a more detailed look at the climate, check out Hiroshima weather in October.
In January, the weather is notably colder, with temperatures dipping to a minimum of -7°C (20°F) and averaging around 4°C (39°F), while reaching a maximum of 14°C (58°F). In contrast, November boasts milder conditions, featuring a minimum of -1°C (31°F) and an average temperature of 11°C (52°F), with highs reaching up to 23°C (75°F). Additionally, January experiences more precipitation, totaling 54 mm (2.1 in) over 9 days, compared to November's 39 mm (1.5 in) over just 5 days. Despite similar humidity levels of 76%, the overall climate in November is significantly more comfortable than in January. For more insights, you can check Hiroshima weather in November.
January's weather is generally colder than December's, with average temperatures ranging from a minimum of -7°C (20°F) to a maximum of 14°C (58°F). In contrast, December sees milder conditions, with temperatures ranging from -2°C (28°F) to a more comfortable 20°C (68°F). While January experiences a bit less precipitation—54 mm (2.1 in) over 9 days compared to December's 66 mm (2.6 in) across 10 days—both months share similar humidity levels, hovering around 75-76%. For a more detailed look at December weather in Hiroshima, visit Hiroshima weather in December.
January in Hiroshima presents a notable contrast to the milder months of the year, characterized by its chilly temperatures and higher humidity levels. With average highs peaking at a modest 14°C (58°F) and lows dipping down to -7°C (20°F), it's a time when bundling up is essential. The month also sees a fair share of precipitation, with about nine days of rain contributing to a total of 54 mm (2.1 in). This wintery weather not only sets a different tone compared to the balmy summers but also creates a unique atmosphere imbued with the beauty of seasonal changes. Explore more about the intricacies of the seasonal shifts in Hiroshima by visiting Hiroshima Climate.