Last updated: August 21, 2025
Experience the vibrant August weather in Nagano, Japan, where temperatures can soar to a max of 35°C (95°F), with a welcoming average of 24°C (75°F) perfect for summer outings. While the city enjoys warm days, it also sees cooler nights with a minimum of 11°C (52°F), ideal for evening strolls. Be prepared for ample rainfall, totaling 198 mm (7.8 in) across 23 days, contributing to the lush greenery that Nagano is known for. With a humidity level of 92%, the air is rich and invigorating, making August a unique blend of hot and humid conditions that captures the essence of summer in this stunning Japanese landscape.
In August, Nagano, Japan, basks in warm, summery temperatures, with average highs reaching 35°C (95°F), making it one of the hottest months of the year. The minimum temperature of 11°C (52°F) provides a comfortable start to the day, while the ideal average of 24°C (75°F) invites locals and tourists alike to explore the region's stunning landscapes. This month marks a stark contrast to the frigid winter temperatures seen earlier in the year, where January's chilling lows plunge to -15°C (6°F). As summer peaks, the warmth of August becomes an ideal time for outdoor adventures and enjoying Nagano’s lush greenery before the cooler autumn months set in.
In August, Nagano experiences a significant shift in precipitation patterns, with 198 mm (7.8 in) of rain falling over 23 days. While this volume is notably lower than the 341 mm recorded in July, it still represents a continuation of the region's rainy summer. The trend indicates a moist atmosphere, as August typically serves as a bridge between the intense rainfall of July and the slightly drier September, which averages 194 mm (7.6 in). This pattern not only underscores Nagano's humid summer climate but also highlights the region's dynamic weather, where consistent rainfall nurtures its verdant landscapes. Overall, August maintains a high level of precipitation, contributing significantly to the area's lush scenery while hinting at the season's gradual transition.
In August, Nagano, Japan, experiences a peak in humidity, matching the summer's swelter with a significant 92% level. This month, alongside July, represents the highest humidity recorded throughout the year, reflecting the typical climatic trend of a hot and muggy summer. As summer transitions to autumn, humidity levels do begin to decline, with a gradual drop to 89% in September, indicating a shift towards cooler, more comfortable weather. Overall, the summer months reveal a tendency for elevated humidity, culminating in August before the pleasant autumn settles in.
In August, Nagano experiences an extreme UV Index of 11, maintaining the high levels observed since May. With a quick burn time of just 10 minutes, it’s crucial for residents and visitors alike to take precautions under the sun. This trend of elevated UV exposure starts in May and persists through the summer months, peaking in August. As the season transitions into September, the UV Index drops slightly to 10, indicating a shift towards very high exposure. Staying informed about UV levels is essential for sun safety in this picturesque region. For more detailed insights, visit Nagano UV Index.
UV Risk Categories
In Nagano, Japan, the month of August is graced with 290 hours of sunshine, marking a peak in the summer season. This sunshine trend reflects a gradual increase from January's modest 174 hours to the vibrant days of late summer. After hitting a high in May with 300 hours, the sunshine hours dip slightly during the cooler months of June and July but remain robust. As August transitions into early autumn, sunlight hours begin to decline, yet the warmth of summer lingers, setting the perfect backdrop for outdoor adventures. Overall, the sunshine trend clearly showcases Nagano's captivating climate, making August a delightful time to enjoy its natural beauty.
In August, the likelihood of sunny weather in Nagano, Japan drops to 22%, placing it among the months with the least sunshine. This trend follows a consistent pattern seen throughout the summer, with July preceding it at 31%. Interestingly, the sunny days sharply contrast with the brighter spring months of April and May, where chances rise to 43% and 25% respectively. As the autumn months approach, the probability of sunlight does begin to improve again, with October and November showcasing 35% and 42% chances, reminding us that while August may be cloudier, the sun is never too far away in Nagano.
In Nagano, Japan, August brings a delightful balance of daylight, offering about 13 hours of sun each day. Following the peak of summer in July, where daylight extends to its maximum of 14 hours, August marks a gentle transition as the days gradually shorten. This month still enjoys significant sunshine, allowing residents and visitors alike to relish in outdoor activities before the onset of autumn. As the year progresses, daylight starts to taper off, with September bringing 12 hours and further reductions in October and November. This rhythmic fluctuation in daylight not only reflects the changing seasons but also enhances the beauty of Nagano's landscapes throughout the year.
In Nagano, Japan, the August winds offer a gentle respite amid summer's warmth, with an average wind speed of 1.5 m/s (3 mph). This slight breeze reflects a subtle decline in wind strength as the season progresses, following a pattern that sees cooler months generally enjoying a bit more vigor in the air. Comparing it to earlier summer months, July and June recorded even lighter winds at 1.3 m/s (3 mph) and 1.4 m/s (3 mph) respectively, suggesting a calmness that permeates the region during these hotter days. Interestingly, as autumn approaches, September heralds a slight uptick in wind speed to 1.6 m/s (4 mph), hinting at a return to slightly brisker conditions. Overall, August serves as a transitional pause, where the winds are soft yet steady, encapsulating the serene beauty of Nagano's summer.
Weather in Nagano varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Nagano, focusing on differences in temperature, rainfall, humidity, and UV levels.
In August, the weather is characterized by warm temperatures, ranging from a brisk 11°C (52°F) at night to a scorching maximum of 35°C (95°F) during the day, accompanied by high humidity levels of 92%. This month sees significant rainfall, with about 198 mm (7.8 in) spread over 23 days. In contrast, January brings a stark chill, with temperatures plummeting to a minimum of -15°C (6°F) and only reaching a maximum of 10°C (51°F). The average temperature hovers around -2°C (29°F), and while it is less rainy than August, January still experiences about 144 mm (5.7 in) of precipitation over 21 days, paired with a humidity level of 88%. For more detailed insights, you can check out the Nagano weather in January.
August and February present contrasting weather conditions in Nagano. In August, temperatures soar with a minimum of 11°C (52°F) and a maximum of 35°C (95°F), creating a warm, humid atmosphere with an average of 24°C (75°F). The month experiences significant rainfall, totaling 198 mm (7.8 in) over 23 days, accompanied by high humidity levels of 92%. In stark contrast, February features a chilling temperature range from a minimum of -14°C (7°F) to a maximum of 16°C (61°F), with an average of -1°C (30°F). Although February has lower precipitation totals at 129 mm (5.1 in) over 19 days, the humidity remains relatively high at 86%. For more detailed insights, check out Nagano weather in February.
Comparing the weather in August and March reveals striking contrasts. In August, temperatures soar with a minimum of 11°C (52°F) and can reach a maximum of 35°C (95°F), while March experiences much cooler conditions, with lows dipping to -9°C (16°F) and highs peaking at 21°C (70°F). Additionally, August is marked by high humidity at 92% and significant rainfall, averaging 198 mm (7.8 in) over 23 days. In contrast, March has a lower humidity level of 81% and receives 133 mm (5.2 in) of precipitation over 18 days. For more detailed insights, you can check out Nagano weather in March.
August and April present stark contrasts in weather patterns. In August, temperatures range from a minimum of 11°C (52°F) to a warm average of 24°C (75°F), peaking at a high of 35°C (95°F). This summer month also experiences significant rainfall, with 198 mm (7.8 in) of precipitation over 23 days, and humidity levels reaching an enveloping 92%. In contrast, April is much cooler, with temperatures stretching from a low of -5°C (22°F) to an average of 9°C (48°F), while maximum temperatures can still reach 27°C (81°F). Rainfall is less frequent in April, totaling 141 mm (5.5 in) over 16 days, and it has a slightly lower humidity level of 78%. For more details on April's weather, check out Nagano weather in April.
August and May offer distinct weather experiences, with August being notably warmer and more humid. In August, temperatures range from a cool 11°C (52°F) at night to a scorching 35°C (95°F) during the day, averaging 24°C (75°F). In contrast, May sees milder conditions with temperatures ranging from a chilly 0°C (33°F) to a pleasant 31°C (88°F), averaging around 15°C (59°F). Precipitation is frequent in both months, with August receiving 198 mm (7.8 in) over 23 days, while May experiences 160 mm (6.3 in) across 16 days. Additionally, August's humidity is high at 92%, compared to May's 81%. For more insights on May's weather, check out Nagano weather in May.
August tends to be warmer and more humid than June, with average temperatures reaching 24°C (75°F) and highs soaring up to 35°C (95°F), compared to June's average of 18°C (65°F) and maximums of 30°C (87°F). While both months experience significant rainfall, August sees slightly more precipitation at 198 mm (7.8 in) over 23 days, whereas June has 171 mm (6.7 in) across 18 days. The humidity levels in August are also higher, averaging 92% compared to June's 88%. For more insights on June's climate, you can explore Nagano weather in June.
When comparing the weather in August to July, we can observe both similarities and differences. August experiences a slightly warmer temperature range, with a minimum of 11°C (52°F), an average of 24°C (75°F), and a maximum of 35°C (95°F). In contrast, July's temperatures are a bit cooler, with a minimum of 15°C (60°F), an average of 22°C (73°F), and a maximum of 33°C (91°F). Precipitation is also noteworthy; August sees 198 mm (7.8 in) spread over 23 days, while July has significantly higher precipitation at 341 mm (13.4 in) over 25 days. Both months share the same high humidity level of 92%, contributing to the overall muggy feel. For more details on July weather specifics, you can refer to Nagano weather in July.
August and September in Nagano show a noticeable shift in weather patterns. In August, temperatures range from a minimum of 11°C (52°F) to a maximum of 35°C (95°F), with an average of 24°C (75°F). The month is characterized by significant humidity at 92% and considerable precipitation, totaling 198 mm (7.8 in) over 23 days. Conversely, September sees a drop in temperature, with minimums of 7°C (44°F) and maximums reaching 32°C (89°F), averaging 19°C (67°F). Precipitation remains similar at 194 mm (7.6 in), but occurs over fewer days, specifically 19. Additionally, humidity decreases slightly to 89%. For more details, you can visit Nagano weather in September.
August and October present quite contrasting weather patterns. In August, temperatures range from a comfortable minimum of 11°C (52°F) to a scorching maximum of 35°C (95°F), with an average temperature of 24°C (75°F). The month is characterized by high humidity at 92% and significant rainfall, with precipitation totaling 198 mm (7.8 in) over 23 days. Conversely, October sees a notable drop in temperatures, with a minimum of 2°C (36°F), an average of 13°C (56°F), and a maximum of 28°C (82°F). While October experiences slightly higher precipitation at 217 mm (8.5 in) across 18 days, humidity remains lower at 87%. For more details on October weather, visit Nagano weather in October.
The weather in August and November shows a stark contrast, reflecting the seasonal transition. In August, temperatures are much warmer, with averages around 24°C (75°F) and highs reaching up to 35°C (95°F), while November sees a significant drop, with average temperatures around 7°C (44°F) and a maximum of 21°C (70°F). Precipitation is also notably different; August experiences 198 mm (7.8 in) over 23 days, making it a much wetter month compared to November, which has only 94 mm (3.7 in) over 15 days. Additionally, humidity levels are higher in August at 92%, compared to November's 85%. For more details on November weather in the area, you can visit Nagano weather in November.
August and December present starkly contrasting weather conditions. In August, temperatures soar with a minimum of 11°C (52°F) and average highs reaching 35°C (95°F), accompanied by high humidity at 92%, which results in significant precipitation of 198 mm (7.8 in) spread over 23 days. In contrast, December features much colder temperatures, with a minimum of -10°C (14°F) and an average of just 1°C (34°F), while maximums peak at 19°C (66°F). The precipitation decreases to 151 mm (6.0 in) over 20 days, and humidity remains relatively high at 86%. For more detailed information on December weather, visit Nagano weather in December.
As summer peaks in August, Nagano experiences a striking blend of warmth and humidity. With temperatures soaring to a maximum of 35°C (95°F) and an average of 24°C (75°F), this month stands out from the cooler seasons, inviting both locals and visitors to enjoy the vibrant outdoor activities. However, with nearly three weeks of rain and a humidity level reaching 92%, the atmosphere can feel quite muggy, making it a stark contrast to the drier, more temperate months of spring and fall. For those planning a trip, it's essential to be prepared for the frequent showers but also to relish the lush, green landscapes that emerge from the abundant precipitation. For more detailed information on Nagano's climate throughout the year, visit Nagano Climate.