Last updated: August 21, 2025
May in Unzen, Japan brings a delightful blend of warm temperatures and vibrant spring-like conditions. With maximum temperatures reaching 30°C (86°F) and an average of 21°C (69°F), the month is characterized by inviting weather that beckons outdoor activities. However, potential visitors should be prepared for some wet days, as 214 mm (8.4 in) of rain falls over approximately 12 days, contributing to a humidity level of 84%. This combination of warmth and moisture creates a lush, green landscape, making May a picturesque time to explore the beauty of Unzen.
In May, Unzen, Japan, ushers in the warmth of spring with temperatures that significantly rise from the earlier months. The minimum temperature settles at a pleasant 10°C (50°F), while the average temperature climbs to a comfortable 21°C (69°F), allowing for plenty of outdoor exploration. As the month progresses, the maximum temperature can reach a delightful 30°C (86°F), hinting at the approaching summer heat. This upward trend reflects a notable transition from the cooler early spring to a more inviting climate, making May an ideal time for visitors to enjoy Unzen's natural beauty and outdoor activities.
In May, Unzen experiences a significant surge in precipitation, with 214 mm (8.4 in) of rain, marking it as one of the wettest months of the year. This uptick in rainfall corresponds with an increase in rainy days to 12, laying the groundwork for the lush greenery that characterizes the region in late spring. Compared to the preceding months—such as April, which saw 135 mm (5.3 in) over just 8 days—May's cooler temperatures and heightened moisture pave the way for a vibrant transformation in the landscape. This trend continues into June, which typically records even higher rainfall, as Unzen transitions into its peak wet season. Such patterns highlight the importance of May as a key month for replenishing local ecosystems before the intense summer rains roll in.
In May, Unzen, Japan experiences a notable uptick in humidity, reaching 84%, a continuation of the trend observed in the preceding months. Starting from a relatively dry January at 75%, the humidity gradually increased through the spring, peaking in June at 86%. This rise points to the onset of the warm summer months, where the air becomes more saturated, leading to refreshing but often muggy conditions. As summer unfolds, July and August see humidity soar to a steamy 92% and 91% respectively, creating a lush, verdant landscape that characterizes this charming region. In contrast, the cooler months from October to April provide relief, with humidity levels fluctuating between 71% to 83%. Overall, May serves as a bridge, ushering in the sweltering summer with its increased humidity, hinting at the vibrant transformation of Unzen's environment.
In May, Unzen, Japan experiences a persistent UV Index of 11, placing it in the extreme exposure category alongside April, resulting in a rapid burn time of just 10 minutes. This trend highlights the significant increase in UV radiation as spring progresses into summer, with both April and May showcasing a maximum exposure level that demands caution. As we move into June and July, the UV Index remains at this extreme level, establishing a pattern of high solar activity through the early summer months. For those enjoying outdoor activities during this time, it's crucial to take protective measures against intense sun exposure. To learn more about the UV Index throughout the year, check Unzen UV Index.
UV Risk Categories
In May, Unzen, Japan, basks in the glow of 279 hours of sunshine, continuing the upward trend established in the months prior. Following a steady increase from the winter months, which saw only 180 hours in January, the sunshine hours swell remarkably as spring takes hold. After peaking in August with a dazzling 300 hours, the sunshine begins to taper off, hinting at the transitional season ahead. Overall, this pattern showcases a vibrant seasonal shift, making May a delightful time to experience Unzen’s natural beauty under its generous sun. With every month, the lengthening days invite both locals and visitors to embrace the great outdoors, painting a picturesque backdrop that complements the region’s stunning landscapes.
As May rolls into Unzen, Japan, the likelihood of sunny weather dips to 28%, marking it as one of the cloudier months of the year. This decline in sunshine comes after a slight increase in the preceding months of March and April, where the likelihood was consistently above 37%. Following May, the trend continues downward into the summer, with June and July reflecting even lower chances of sun at 21% and 20%, respectively. Interestingly, the weather pattern in Unzen shows an upswing in sunny days later in the year, with October boasting a remarkable 64% chance of sunshine. As such, while May may be less favorable for sunny outings, it serves as a prelude to the more radiant days ahead.
In Unzen, Japan, May signals the peak of spring's vibrant transformation, with daylight stretching to an inviting 13 hours. This increase follows a steady climb from the 10 hours of January to a more moderate 12 hours in April, revealing a trend of gradual elongation as the year progresses. As daylight reaches its zenith in June, with 14 hours, May serves as the perfect prelude, basking in the warmth and extended hours that invigorate the natural landscape. The transition into summer brings longer days, but the charm of May lies in its balance, hinting at the sunny days ahead while still embracing the freshness of spring.
In May, the average wind speed in Unzen, Japan, gently settles at 2.6 m/s (6 mph), marking a slight decline from the breezier months of earlier spring. This trend showcases the transition to a calmer atmosphere as warmer weather approaches. While January through April experience consistently higher speeds, May reveals a lull before the summer months, with June presenting the most tranquil conditions at 1.6 m/s (4 mph). Interestingly, the wind picks up again in July and August, where speeds stabilize around 2.5 m/s to 2.7 m/s, suggesting a summer revival of breezy days. Overall, May serves as a bridge, transitioning from the vibrant gusts of spring to the more laid-back winds of summer, painting a picture of Unzen's shifting seasonal character.
Weather in Unzen varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Unzen, focusing on differences in temperature, rainfall, humidity, and UV levels.
May and January present quite contrasting weather conditions. In May, temperatures range from a mild 10°C (50°F) at night to a warm 30°C (86°F) during the day, with an average of 21°C (69°F). This month also experiences significant rainfall, accumulating 214 mm (8.4 in) over 12 days, along with high humidity levels at 84%. In stark contrast, January sees much cooler temperatures, with a minimum of -2°C (29°F) and a maximum of 19°C (66°F), averaging only 8°C (46°F). Precipitation is lighter in January, totaling 53 mm (2.1 in) over just 6 days, and humidity is relatively lower at 75%. For a more detailed look at the January weather conditions, visit Unzen weather in January.
May and February present strikingly different weather patterns. In May, temperatures range from a comfortable minimum of 10°C (50°F) to a warm maximum of 30°C (86°F), averaging around 21°C (69°F). This month also experiences higher humidity at 84% and significantly more precipitation, with 214 mm (8.4 in) falling over 12 days. In contrast, February’s temperatures can dip to a chilly minimum of -2°C (29°F), making the average just 8°C (48°F) and peaking at 22°C (71°F). Additionally, February sees much less precipitation, totaling 92 mm (3.6 in) over 9 days and lower humidity at 71%. For more detailed information about February weather, you can visit Unzen weather in February.
In comparing the weather patterns of March and May, it's evident that May tends to have significantly warmer temperatures. The average temperature in May reaches a pleasant 21°C (69°F), with highs peaking at 30°C (86°F), while March's average is much cooler at 12°C (55°F) and peaks at 24°C (76°F). Additionally, May experiences higher humidity at 84%, compared to March's 71%, which can make the warmth feel more intense. Despite May having more precipitation at 214 mm (8.4 in) over 12 days, March also has notable rainfall at 145 mm (5.7 in) over 11 days. For a detailed look into the March climate, you can visit Unzen weather in March.
In comparing the weather of April and May, we notice a significant warming trend from one month to the next. April's temperatures range from a minimum of 5°C (41°F) to a maximum of 29°C (84°F), with an average of 16°C (62°F). In contrast, May sees higher temperatures, with a minimum of 10°C (50°F), an average of 21°C (69°F), and a maximum of 30°C (86°F). Precipitation also increases in May, amounting to 214 mm (8.4 in) over 12 days, compared to April's 135 mm (5.3 in) over just 8 days. Moreover, May tends to be more humid, with humidity levels reaching 84% compared to April's 78%. For more details on April weather, you can check Unzen weather in April.
May and June present a noticeable transition in weather patterns. In May, temperatures range from a minimum of 10°C (50°F) to a maximum of 30°C (86°F), with an average of 21°C (69°F). The month sees about 214 mm (8.4 in) of precipitation over 12 days, coupled with a humidity level of 84%. In contrast, June experiences warmer temperatures, with lows of 16°C (60°F) and highs reaching up to 32°C (90°F), resulting in an average of 24°C (75°F). However, this month also brings increased rainfall, with 262 mm (10.3 in) of precipitation spread across 15 days, while humidity slightly rises to 86%. This shift underscores the wet and warm conditions typical of early summer. For further details, you can check Unzen weather in June.
May and July showcase a significant shift in weather conditions. In May, temperatures range from a minimum of 10°C (50°F) to a maximum of 30°C (86°F), with an average of 21°C (69°F). The month experiences about 214 mm (8.4 in) of precipitation over 12 days, coupled with a humidity level of 84%. In contrast, July sees much warmer temperatures, with a minimum of 20°C (68°F) and a maximum reaching up to 37°C (99°F), averaging 27°C (82°F). Precipitation also rises sharply to 475 mm (18.7 in) over 19 rainy days, and humidity increases to 92%. The notable increase in temperature and moisture makes July feel much more sultry compared to May. For more detailed insights on July weather, check out Unzen weather in July.
In May, the weather is milder with temperatures ranging from a minimum of 10°C (50°F) to a maximum of 30°C (86°F), averaging around 21°C (69°F). The month sees significant rainfall, accumulating 214 mm (8.4 in) over 12 days, accompanied by a high humidity level of 84%. In contrast, August is considerably warmer, featuring temperatures that start at a minimum of 20°C (68°F) and can reach up to 39°C (102°F), with an average of 29°C (85°F). This month is also wetter, with 303 mm (11.9 in) of precipitation over 14 days and increased humidity at 91%. For more about the specifics of August weather, you can visit Unzen weather in August.
May and September both offer warm temperatures and high humidity, but they present distinct differences in weather patterns. In May, temperatures range from a minimum of 10°C (50°F) to a maximum of 30°C (86°F), with an average of 21°C (69°F). This month typically experiences 214 mm (8.4 in) of rainfall over 12 days. In contrast, September boasts slightly higher temperatures, with a minimum of 16°C (62°F) and a maximum of 35°C (94°F), averaging 25°C (78°F). Additionally, it sees a bit more precipitation at 228 mm (9.0 in) across 15 days. Despite these differences, both months maintain a consistent humidity level of 84%. For more details on September weather, check out Unzen weather in September.
In comparing the weather of May and October, both months share similar minimum and average temperatures, hovering around 10°C (50°F) and 21°C (69°F) respectively. However, October tends to experience slightly warmer maximum temperatures, peaking at 33°C (91°F) compared to May's maximum of 30°C (86°F). Precipitation is also more pronounced in May, with 214 mm (8.4 in) over 12 days, whereas October sees less rain at 120 mm (4.7 in) across 9 days. Humidity levels remain quite similar, with May at 84% and October slightly lower at 83%. For a more detailed look, you can check Unzen weather in October.
May and November present contrasting weather conditions. In May, temperatures range from a comfortable minimum of 10°C (50°F) to a warm average of 21°C (69°F), peaking at a high of 30°C (86°F). This month also sees significant rainfall, with 214 mm (8.4 in) spread over 12 days, contributing to a humidity level of 84%. In contrast, November offers cooler temperatures, with lows of 3°C (38°F) and an average of 15°C (59°F), reaching a maximum of 25°C (78°F). The precipitation in November is markedly less, totaling 80 mm (3.1 in) over 8 days, while humidity decreases slightly to 81%. For more detailed information, you can refer to Unzen weather in November.
May and December present strikingly different weather patterns. In May, temperatures range from a mild 10°C (50°F) at night to a warm 30°C (86°F) during the day, offering an average temperature of 21°C (69°F). The month is characterized by considerable rainfall, with 214 mm (8.4 in) spread over 12 days, and humidity levels are relatively high at 84%. In contrast, December brings cooler temperatures, with a minimum of 0°C (33°F) and an average of only 10°C (49°F), peaking at 24°C (76°F). Rainfall diminishes significantly to 89 mm (3.5 in) over just 7 days, accompanied by a slightly lower humidity of 79%. For those interested in more detailed December weather patterns, you can explore Unzen weather in December.
As May arrives in Unzen, the weather transforms into a delightful blend of warmth and freshness, offering a welcome contrast to the cooler months preceding it. With the maximum temperatures climbing towards 30°C (86°F) and an overall average that suggests a more temperate embrace at 21°C (69°F), it's a perfect time to enjoy the vibrant nature coming to life. While rainfall is not uncommon, totaling about 214 mm, the occasional downpour, often interspersed with high humidity levels of around 84%, can refresh the landscape beautifully. This month provides a unique opportunity to experience Unzen in full bloom, making it an ideal time for outdoor adventures. For more detailed insights about the climate, check out Unzen Climate.