Last updated: August 21, 2025
May in Iwakuni, Japan presents a delightful climate characterized by mild temperatures and notable humidity. The maximum temperature peaks at 28°C (83°F), while the average hovers around 19°C (66°F). As the month unfolds, the minimum temperature dips to 7°C (45°F), providing a refreshing contrast. However, the season also brings with it 136 mm (5.4 in) of precipitation over approximately 9 days, resulting in a humidity level of 84%, which adds a lush vibrancy to the surrounding landscape. This month offers an engaging blend of warmth and moisture, making it ideal for exploring the natural beauty of the region.
In May, Iwakuni, Japan experiences a delightful transition into warmer weather as spring reaches its peak. With minimum temperatures rising to a comfortable 7°C (45°F) and average daily highs soaring to 28°C (83°F), this month marks the beginning of more pleasant days ahead. The average temperature climbs to a welcoming 19°C (66°F), creating an inviting atmosphere that encourages outdoor activities and exploration. Following a gradual increase from the chillier months of winter, May is a time when blossoms are vibrant, and the landscape comes alive, making it a perfect month for visitors to enjoy the beauty of Iwakuni.
May in Iwakuni, Japan, sees a notable continuation of the wet season, with precipitation reaching 136 mm (5.4 in) over approximately 9 days of rain. This rainfall is slightly less than April's totals, yet it underscores a persistent trend of increasing precipitation leading into the summer months. As spring transitions, the region prepares for a wetter June, which typically brings more substantial rainfall. The consistent rainfall pattern in May not only supports lush greenery but also hints at the imminent shift towards the summer deluge that peaks in July, which can bring over double the precipitation experienced in May.
May in Iwakuni, Japan, brings a notable rise in humidity, reaching a robust 84%. This increase marks a significant jump from the preceding months, particularly when compared to April's 75%. As spring gives way to early summer, Iwakuni's atmosphere becomes increasingly moist, providing a preview of the sweltering conditions that characterize the following months. June and July are particularly humid, with levels soaring to 88% and an astonishing 95%, respectively. This trend highlights a gradual progression towards the exceptionally sticky summer, making May a bridge between the mild spring and the heat to come.
As May unfolds in Iwakuni, Japan, residents and visitors alike should be prepared for extreme UV exposure, with the UV Index peaking at 11—matching the trend set in April. With a rapid increase from moderate levels in earlier months, such as January and February, to a concerning very high index in March, the sun’s intensity during this time necessitates caution, as the burn time drops to just 10 minutes. This aligns with a pattern that continues into June, highlighting the importance of sun protection as summer approaches. To stay informed and safe while enjoying outdoor activities, be sure to consult the Iwakuni UV Index.
UV Risk Categories
As spring transitions into summer, May shines brightly in Iwakuni, Japan, boasting an impressive 303 hours of sunshine. This increase not only marks the peak of spring's vibrancy but also showcases a steady upward trend from the 266 hours in March to 282 hours in April. Following this sun-drenched month, the sunshine gradually tapers off into June, yet it remains a highlight of the season. Interestingly, this monthly total reflects Iwakuni's overall sunny disposition, with August ultimately taking the crown at 308 hours, further illustrating the warm, inviting climate that defines this picturesque locale throughout the year.
In Iwakuni, Japan, the likelihood of sunny weather experiences a notable shift as spring gives way to summer. May stands out with a 31% chance of sunshine, a slight dip compared to the preceding months of April (47%) and March (40%). This declining trend continues into the summer months, where June sees only a 25% likelihood of sunny skies. While May might not boast the brightest forecast, it does remain relatively sunnier than the peak of summer. Looking ahead, the chance of sun increases again in the fall, making May a transitional month full of potential, even if it isn't the sunniest in the calendar year.
In Iwakuni, Japan, the transition from winter to summer unfolds beautifully through its daylight duration. Starting the year with a steady 10 hours in January and February, daylight begins to stretch gradually in March, reaching 11 hours. By April, the days become noticeably longer, with 13 hours of daylight, a trend that continues into May. Here, daylight remains consistent at 13 hours, providing a perfect backdrop for outdoor activities as spring blossoms. As June and July arrive, Iwakuni basks in the warmth of summer with a peak of 14 hours of daylight, offering ample time for exploration and adventure. The gradual decline begins in August, dipping to 13 hours, before transitioning into fall with shorter days in September (12 hours) and October (11 hours). The cycle of daylight in Iwakuni beautifully mirrors the changing seasons, inviting residents and visitors alike to savor each moment.
In Iwakuni, Japan, the month of May greets residents and visitors with a gentle breeze, showcasing an average wind speed of 2.8 m/s (6 mph). This calming wind is part of a broader trend observed from January to May, where the wind speeds remain relatively stable, hovering between 2.8 m/s and 3.3 m/s. Unlike the more robust gusts of earlier months, May's winds mirror the tranquility of spring, subtly preparing for the calm summer ahead. As temperatures rise and nature blooms, the consistent breeze invites outdoor exploration, offering a refreshing complement to the season’s warmth.
Weather in Iwakuni varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Iwakuni, focusing on differences in temperature, rainfall, humidity, and UV levels.
May and January present stark contrasts in weather. In May, temperatures range from a minimum of 7°C (45°F) to a pleasant average of 19°C (66°F), peaking at 28°C (83°F). This month sees a considerable amount of rainfall, accumulating 136 mm (5.4 in) over 9 days, accompanied by high humidity levels of 84%. In contrast, January experiences much colder temperatures, with a minimum of -4°C (25°F) and an average of just 5°C (42°F), reaching a maximum of 15°C (59°F). Precipitation during January is significantly lower at 49 mm (1.9 in) over 6 days, and the humidity is also lower at 76%. For more details, you can check Iwakuni weather in January.
May generally brings warmer temperatures compared to February, with average highs reaching 19°C (66°F) and maximums soaring to 28°C (83°F), in contrast to February's averages which peak at 20°C (68°F) but have a significantly lower average of 6°C (43°F). While May enjoys a more humid environment at 84%, February experiences a drier atmosphere with humidity at 72%. Additionally, May tends to be wetter with 136 mm (5.4 in) of precipitation over 9 days, compared to February's 69 mm (2.7 in) over just 7 days. For more details on February weather specifics, you can visit Iwakuni weather in February.
In comparing the weather conditions of May and March, it's evident that May is significantly warmer, with average temperatures reaching 19°C (66°F) compared to March's cooler average of 10°C (50°F). While both months experience a fair amount of precipitation, May has slightly higher rainfall at 136 mm (5.4 in) over 9 days, compared to March's 125 mm (4.9 in) over 10 days. Additionally, humidity levels are higher in May at 84%, indicating a more humid climate than March's 69%. This shift in weather highlights the transition from early spring to the onset of summer. For more detailed information on March weather specifics, you can check Iwakuni weather in March.
In comparing the weather of May and April, May tends to be noticeably warmer, with average temperatures rising from April's 14°C (58°F) to 19°C (66°F) and a higher maximum temperature of 28°C (83°F) compared to April's high of 24°C (76°F). Both months experience similar levels of precipitation—approximately 136 mm (5.4 in) over 9 days—but May features a higher humidity rate of 84%, contrasting with April's 75%. For more details on April weather, you can check Iwakuni weather in April.
Comparing the weather in May and June reveals noticeable differences in temperature and precipitation. May typically experiences milder temperatures, with a minimum of 7°C (45°F), an average of 19°C (66°F), and a maximum of 28°C (83°F). In contrast, June sees a rise in warmth, with minimum temperatures starting at 14°C (57°F) and an average of 22°C (72°F), peaking at 29°C (85°F). However, June is also characterized by increased precipitation, averaging 181 mm (7.1 in) over 14 days, compared to May's 136 mm (5.4 in) over just 9 days. The humidity also rises slightly from 84% in May to 88% in June, contributing to a more tropical feel as summer approaches. For more detailed information, check out Iwakuni weather in June.
May and July present distinctly different weather patterns. In May, temperatures range from a cool minimum of 7°C (45°F) to a comfortable average of 19°C (66°F), peaking at 28°C (83°F). However, May is relatively rainy, with 136 mm (5.4 in) of precipitation spread over 9 days, accompanied by a humidity level of 84%. In contrast, July experiences much warmer temperatures, with a minimum of 18°C (65°F) and an average of 26°C (79°F), reaching a high of 35°C (95°F). July also sees significantly more rainfall, totaling 386 mm (15.2 in) over 19 days, and the humidity rises to 95%. For more specific details about the weather conditions in July, check out Iwakuni weather in July.
May and August showcase significant variations in weather patterns. In May, temperatures range from a comfortable minimum of 7°C (45°F) to an average of 19°C (66°F), peaking at a maximum of 28°C (83°F). The month sees regular rainfall, with 136 mm (5.4 in) of precipitation over about 9 days, accompanied by a humidity level of 84%. In contrast, August experiences much warmer temperatures, with a minimum of 20°C (67°F) and an average of 28°C (82°F) that can soar up to 35°C (96°F). Rainfall is also more prevalent, totaling 256 mm (10.1 in) over approximately 14 days, and humidity increases to 93%. For a more detailed look at August weather, you can refer to this link: Iwakuni weather in August.
May and September offer distinctly different weather experiences. In May, temperatures range from a chilly 7°C (45°F) at night to a warm 28°C (83°F) during the day, with an average of 19°C (66°F). The month sees around 136 mm (5.4 in) of precipitation over roughly 9 days, contributing to its high humidity of 84%. In contrast, September brings warmer nights with minimum temperatures of 15°C (60°F) and daytime highs reaching up to 33°C (92°F), averaging 24°C (75°F). However, it is also wetter, with about 237 mm (9.3 in) of rainfall spread across 14 days, while maintaining the same humidity of 84%. For more specific details, you can check Iwakuni weather in September.
In May, temperatures range from a minimum of 7°C (45°F) to a maximum of 28°C (83°F), with an average of 19°C (66°F). The month experiences about 136 mm (5.4 in) of precipitation over 9 days, accompanied by a high humidity level of 84%. In contrast, October sees slightly warmer temperatures, with a minimum of 8°C (46°F) and a maximum reaching 29°C (85°F), while maintaining the same average of 19°C (66°F). However, it brings more rainfall, totaling 172 mm (6.8 in) over 10 days, and a lower humidity level of 79%. For more detailed insights, check out Iwakuni weather in October.
May and November present distinct weather characteristics that highlight the transition between spring and autumn. In May, temperatures range from a minimum of 7°C (45°F) to a maximum of 28°C (83°F), with an average of 19°C (66°F). The month experiences significant rainfall, totaling 136 mm (5.4 in) over approximately 9 days, coupled with high humidity at 84%. In contrast, November features cooler temperatures, with a minimum of 2°C (36°F), an average of 13°C (55°F), and a maximum of 23°C (74°F). Precipitation is considerably lower at 37 mm (1.5 in) over about 5 days, and humidity is also reduced to 76%. This comparison underscores the warmer, wetter conditions of May against the cooler, drier climate typical of November. For more details, check Iwakuni weather in November.
May and December present a stark contrast in weather conditions. In May, temperatures range from a mild 7°C (45°F) to a warm 28°C (83°F), with an average of 19°C (66°F), while December sees much cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 20°C (69°F), averaging only 7°C (46°F). Additionally, May experiences significantly more precipitation at 136 mm (5.4 in) over nine days, compared to December's 61 mm (2.4 in) over just six days. Although May has a higher humidity level of 84%, December's humidity remains relatively comfortable at 75%. For a detailed look at December's weather, check out Iwakuni weather in December.
As May unfolds in Iwakuni, the weather begins to transition into a more temperate and inviting phase compared to the chillier months before it. Average temperatures rise, bringing a refreshing warmth that makes outdoor activities more enjoyable. With maximums reaching up to 28°C (83°F) and minimums around 7°C (45°F), the month offers a comfortable range for varied preferences. However, it also marks the beginning of the rainy season, with 9 days of precipitation and humidity lingering at a high 84%. This blend of warmth and moisture contrasts with the drier conditions of earlier months, creating a lush environment that hints at the vibrant summer ahead. For a deeper understanding of Iwakuni's evolving weather patterns, visit Iwakuni Climate.