Last updated: August 21, 2025
August in Otaru, Japan is characterized by warm temperatures and notable humidity, making it a vibrant time for visitors. The maximum highs can reach up to 29°C (85°F), while the average temperature hovers around 21°C (70°F), providing a pleasant summer atmosphere. However, the season is marked by frequent rainfall, with 169 mm (6.7 in) of precipitation spread across 14 days, resulting in a humidity level of 95%. This combination of warmth and moisture creates a lush landscape, perfect for exploring the scenic beauty and cultural attractions of Otaru.
In August, Otaru experiences a delightful summer warmth, with temperatures rising significantly compared to the colder months. The minimum temperature rests at a mild 14°C (58°F), while the average climbs to a comfortable 21°C (70°F), peaking at a pleasant 29°C (85°F). This marks a notable shift from the chill of winter, where temperatures can dip to -12°C (10°F) in January. The overall trend shows a steady warm-up throughout the summer months, making August one of the hottest times of the year, inviting both locals and tourists to enjoy outdoor activities in the vibrant city. With such a welcoming climate, Otaru transforms into a summer haven where the beauty of nature can be fully appreciated.
August brings a significant shift in precipitation to Otaru, Japan, with 169 mm (6.7 in) of rainfall, marking it as the wettest month of the year. This increase in moisture is a striking contrast to the preceding summer months, where July recorded 101 mm (4.0 in). Notably, August experiences 14 rainy days, providing a consistent pattern of showers that contribute to the lush landscapes of the region. As summer transitions into fall, the rainfall remains abundant, with September maintaining a high level of 117 mm (4.6 in). This trend of elevated precipitation in late summer supports the rich biodiversity of Otaru but also highlights the region's propensity for rain, especially as it prepares for the wetter autumn months ahead.
August in Otaru, Japan, brings a peak in humidity, reaching 95%, making it the most humid month of the year. This summer swell is part of a broader trend, as humidity gradually increases from the dry conditions of winter, which average around 84% in January. Notable rises are evident from May onwards, with June and July experiencing significant spikes, culminating in the sticky air of August. As the year progresses, humidity begins to taper off into September at 88%, signaling a transition into the cooler months ahead, yet the lingering summer air often keeps August feeling particularly heavy and damp.
In August, Otaru experiences its peak UV Index at 10, marking a significant rise from previous months. This places the exposure category in the very high range, meaning that sunburn can occur swiftly, with a burn time of just 15 minutes. This trend follows a summer pattern where UV levels have remained consistently high since May, indicating that protective measures are essential for sunbathers and outdoor enthusiasts alike. As the summer heat begins to wane into September, the UV Index dips slightly to 8, but remains very high, reminding residents and visitors to stay vigilant about sun safety throughout the season. For more detailed insights, check the full Otaru UV Index.
UV Risk Categories
August in Otaru, Japan, continues the trend of abundant sunshine, boasting 294 hours of sunlight—a slight dip from the peak of 320 hours in July, yet still reflective of a vibrant summer. This month serves as a warm farewell to the long, sunlit days that characterized the preceding months, culminating in an impressive average that showcases Otaru’s allure during the height of summer. As the transition to autumn begins in September, with a decrease to 273 hours, the lingering warmth of August remains a cherished memory, inviting both locals and visitors to bask in the last rays of summer before the days grow shorter.
In Otaru, Japan, August brings a moderate likelihood of sunny weather, with a 33% chance for clear skies. This figure represents a slight dip compared to the peak sunshine months of June and July, where the probability hovers around 48% and 47%, respectively. Interestingly, while August doesn’t match those summer highs, it is still significantly sunnier than the earlier months of the year, such as February's mere 20% chance. As the summer season transitions, August offers a pleasant mix of warmth and occasional sunshine, making it a delightful time for outdoor activities amid the natural beauty of this coastal city.
In Otaru, Japan, the transition of daylight duration throughout the year reveals a captivating rhythm, particularly noticeable in August. With 13 hours of daylight, August marks a peak of light before the early onset of autumn begins to shorten the days. This slight decline from the summer's longest days in June and July reflects a gentle shift in the seasons. Following the vibrant and sun-drenched months of late spring and early summer, August offers a warm embrace of sunlight that gradually paves the way for September’s decrease to 12 hours, heralding the approach of shorter days. Overall, the daylight trends illustrate a lively summer crescendo, tapering into the nuanced beauty of fall in this picturesque coastal city.
In Otaru, Japan, the winds of August bring a gentle breath of air, averaging 3.3 m/s (7 mph), which mirrors the calmness of the preceding July. This month stands out as a transitional point, as the summer winds begin to shift. Following a gradual decline from spring, where gusts were more brisk, August maintains a noticeably softer rhythm that invites locals and visitors alike to enjoy the serene coastal atmosphere. As the year progresses into the autumn months, winds will pick up slightly, with October and November showcasing a return to higher averages, but August remains a lovely reprieve amidst these shifts—a time when the breezes are light and the city pulses with warmth and life.
Weather in Otaru varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Otaru, focusing on differences in temperature, rainfall, humidity, and UV levels.
August and January present starkly contrasting weather conditions. In August, temperatures range from a mild 14°C (58°F) to a warm 29°C (85°F), with an average of 21°C (70°F) and high humidity at 95%. Precipitation is significant, totaling 169 mm (6.7 in) over about 14 days, contributing to a lush and vibrant atmosphere. In contrast, January brings frigid temperatures, with a minimum of -12°C (10°F) and a maximum of only 4°C (40°F), averaging -4°C (25°F). With 87 mm (3.4 in) of precipitation over 20 days and a humidity level of 84%, January's weather is marked by its cold wintry conditions. For more details on the specifics of January weather, you can check Otaru weather in January.
August and February present strikingly contrasting weather patterns. In August, temperatures range from a mild 14°C (58°F) at night to a warm 29°C (85°F) during the day, with high humidity levels of 95%. The month receives considerable rainfall, averaging 169 mm (6.7 in) over approximately 14 days. Conversely, February experiences much colder conditions, with temperatures dropping as low as -13°C (8°F) and peaking at only 6°C (44°F). Despite having fewer days of precipitation at 22 days, February receives about 99 mm (3.9 in) of rain and has a lower humidity level of 83%. For a deeper look at February weather in Otaru, you can visit Otaru weather in February.
August and March present stark contrasts in weather conditions. In August, temperatures range from a pleasant 14°C (58°F) at night to a warm 29°C (85°F) during the day, with high humidity levels peaking at 95%. This month also experiences significant rainfall, averaging 169 mm (6.7 in) over 14 days. In contrast, March is characterized by much cooler temperatures, with a minimum of -7°C (19°F) and a maximum of 12°C (54°F), resulting in an average of only 1°C (34°F). Although March has fewer total precipitation days at 16, it still accumulates around 95 mm (3.7 in) of rain, along with lower humidity at 81%. For more details, visit Otaru weather in March.
The contrast between April and August weather is quite striking. In August, temperatures are significantly warmer, with averages around 21°C (70°F) and highs reaching up to 29°C (85°F), compared to April's much cooler averages of 5°C (40°F) and a maximum of just 17°C (63°F). Additionally, August is wetter, experiencing about 169 mm (6.7 in) of precipitation over 14 days, while April sees only 76 mm (3.0 in) over 11 days. Humidity levels are also higher in August at 95%, compared to April’s 81%. For more detailed information on April weather, you can check out Otaru weather in April.
When comparing the weather in August to May, we can observe notable differences in temperature, precipitation, and humidity. In August, temperatures range from a minimum of 14°C (58°F) to a maximum of 29°C (85°F), with an average of 21°C (70°F), making it significantly warmer than May, where the temperatures start at a chilly minimum of 3°C (38°F) and peak at 26°C (80°F), averaging only 11°C (51°F). Additionally, August sees higher precipitation levels, totaling 169 mm (6.7 in) over 14 days, compared to May’s 90 mm (3.6 in) over 13 days. The humidity in August is also notably higher at 95%, compared to May’s 86%, contributing to a more muggy feel during the peak of summer. For a closer look at these conditions, you can visit Otaru weather in May.
August weather is notably warmer and more humid compared to June. The minimum temperature in August is 14°C (58°F), which is significantly higher than June's minimum of 6°C (44°F). While August enjoys an average temperature of 21°C (70°F) and can peak at a maximum of 29°C (85°F), June has a cooler average of 14°C (58°F) and a maximum of only 24°C (75°F). Precipitation is also more frequent in August, with 169 mm (6.7 in) falling over 14 days, compared to June's 112 mm (4.4 in) over 12 days. Humidity levels are higher in August at 95%, making it feel more muggy than the 87% average humidity in June. For more details, you can also check Otaru weather in June.
In comparing the weather of July and August, we see that August tends to be slightly warmer and more humid. The average temperature in August reaches 21°C (70°F), with a minimum of 14°C (58°F) and a maximum of 29°C (85°F), while July has a lower average of 20°C (68°F) with temperatures ranging from 9°C (49°F) to 28°C (82°F). Additionally, August experiences significantly more precipitation at 169 mm (6.7 in) over 14 days, compared to July's 101 mm (4.0 in) over 12 days. The humidity also increases slightly in August to 95% compared to July's 93%. These factors contribute to a more tropical feel in August. For more detailed insights into how July fares specifically, check out Otaru weather in July.
August typically experiences warmer temperatures, with averages around 21°C (70°F) and maximums peaking at 29°C (85°F), while September sees a slight decrease, averaging 18°C (65°F) and maxing out at 26°C (80°F). Precipitation is also notable in both months; August receives 169 mm (6.7 in) of rain over 14 days, compared to September's 117 mm (4.6 in) over the same number of days. Humidity levels remain high in both months, but August boasts a more humid atmosphere at 95%, whereas September's humidity drops to 88%. For more detailed insights on September weather specifics, check Otaru weather in September.
August weather is characterized by warmer temperatures, with a minimum of 14°C and an average of 21°C, peaking at 29°C. However, it experiences high humidity levels at 95% and significant rainfall, totaling 169 mm over 14 days. In contrast, October brings a noticeable drop in temperatures, with a minimum of 4°C and an average of 12°C, while the maximum reaches 22°C. Although October sees slightly less precipitation at 152 mm spread over 17 days, the humidity is lower at 83%. For more details on October weather, check Otaru weather in October.
August and November present stark contrasts in weather patterns. In August, the temperatures are notably warmer, with minimums reaching 14°C (58°F) and maximums peaking at 29°C (85°F), accompanied by high humidity levels of 95%. The month experiences significant rainfall, with 169 mm (6.7 in) spread over 14 days. In contrast, November brings a chill, with temperatures ranging from a minimum of -5°C (23°F) to a maximum of 15°C (59°F) and an average of only 5°C (42°F). While precipitation is nearly the same at 167 mm (6.6 in), it occurs over more days, totaling 22. Additionally, the humidity drops to 79%, reflecting the cooler, drier conditions typical of late autumn. For more detailed information, you can check out Otaru weather in November.
August and December present stark contrasts in weather patterns. In August, temperatures range from a mild 14°C (58°F) at night to a warm 29°C (85°F) during the day, accompanied by high humidity levels of 95% and substantial rainfall totaling 169 mm (6.7 in) over about 14 days. In contrast, December sees much colder conditions, with temperatures dipping to a minimum of -10°C (15°F) and peaking at just 11°C (52°F), along with lower humidity at 80%. Precipitation is somewhat frequent in December, occurring over 27 days, but amounts to 147 mm (5.8 in). For more detailed information about winter conditions, refer to Otaru weather in December.
August in Otaru is characterized by warm, humid days and a notable increase in precipitation compared to other months. With temperatures reaching a maximum of 29°C, the weather is considerably more pleasant, making it perfect for outdoor activities. However, the 14 days of rain can be a bit of a surprise, resulting in a sticky atmosphere with humidity levels soaring up to 95%. This blend of warmth and moisture creates a vibrant summer experience, distinctly different from the cooler, drier conditions of spring and autumn. For a deeper understanding of what to expect throughout the year, visit Otaru Climate.