Last updated: August 21, 2025
In August, Sendai experiences a blend of warmth and humidity, with maximum temperatures soaring to 35°C (95°F) and an average of 25°C (77°F), while the mercury rarely dips below 14°C (58°F). This month is characterized by substantial precipitation, averaging 214 mm (8.4 in) spread over 20 rainy days, contributing to a high humidity level of 92%. Visitors can expect lush landscapes and vibrant greenery, but should also prepare for the likelihood of rainy spells as tropical systems influence the region’s weather patterns.
August in Sendai, Japan, is characterized by warm and inviting temperatures, making it one of the most enjoyable months of the year. With average temperatures reaching a pleasant 25°C (77°F), visitors can expect maximum highs soaring up to 35°C (95°F), reflecting the peak of summer's heat. Evenings bring a respite with minimum temperatures around 14°C (58°F), offering a comfortable atmosphere for outdoor activities and enjoying the vibrant city life. This trend of heat peaks in August follows a gradual warming from the milder June and July months, creating a seamless transition into the full swing of summer. As summer draws to a close, Sendai’s August warmth sets the perfect backdrop for festivals and outdoor adventures, embodying the lively spirit of the season.
In August, Sendai experiences a noticeable peak in precipitation, with 214 mm (about 8.4 inches) of rain falling over 20 days. This marks a slight decline from the previous month’s substantial 232 mm, yet it still solidifies August as one of the wettest months of the year. The rainy season typically extends from July to September, indicating a trend of increased rainfall during the summer months, with August often serving as a particularly soggy mid-point. As the summer heat lingers, the frequent showers provide much-needed moisture, contributing to the region’s lush greenery and vibrant landscapes. This pattern highlights Sendai's dynamic weather, where summer storms play a crucial role in shaping both the environment and the daily lives of its residents.
In August, Sendai experiences its peak humidity levels, soaring to 92%, a trend that began in the warmer months. Following a steady increase from 80% in May to 92% in July, this high humidity remains unchanged into August, contributing to the region's sultry summer atmosphere. The previous months show a gradual decline from January's 80%, but as summer progresses, humidity rises sharply, with June and July marking a significant uptick. As the season transitions to autumn in September, humidity dips to 86%, signaling the gradual retreat of the high summer moisture. Overall, Sendai's humidity reveals a clear seasonal pattern, peaking in the intense warmth of summer before easing into the more temperate fall.
In August, Sendai experiences its highest UV Index, peaking at 11, categorized as extreme exposure. This level of intensity means that individuals can burn in just 10 minutes, prompting keen awareness for sun safety. Following a gradual increase through the spring and summer months—from a moderate index of 3 in January to a notable 10 in both June and July—the intense levels in August highlight the region's seasonal shift toward harsher sun conditions. As summer draws to a close, September sees a slight decrease to a 9, reminding residents and visitors alike of the need for vigilant sun protection during the peak summer days. For more detailed insights, visit Sendai UV Index.
UV Risk Categories
During August, Sendai enjoys a delightful 271 hours of sunshine, continuing a trend of bright summer days that peak in late spring and early summer. Following the highs of May with 292 hours, the sunshine hours slightly decline through July, but August maintains a robust amount of sunlight, similar to that of April, and signals the end of the bustling summer season. As autumn approaches, sunshine hours begin to taper off, with September recording 247 hours. This gradual decrease highlights Sendai's transition from warm summer days to the crispness of fall, offering a picturesque backdrop for those enjoying the natural beauty of the area.
In August, Sendai experiences a relatively low chance of sunny weather, with only 24% likelihood of sunshine. This trend reflects a general pattern in the summer months, as both June and July share similarly low probabilities at 21%. While spring months like April and May exhibit slightly better chances of sun, the peak summer period doesn't offer the bright days many might expect. As a greater percentage of cloudy or rainy weather looms, those planning a visit to Sendai in August should be prepared for overcast skies rather than basking in sunshine.
In August, Sendai enjoys approximately 13 hours of daylight, making it one of the sunniest months of the year. This slight decline from the 14 hours experienced in both June and July signals the gradual transition towards autumn. The daylight duration peaks in late spring and summer, with each month steadily increasing from January's 9 hours until it reaches a climax from May through July. As summer begins to wane, daylight hours begin their descent, transitioning into the shorter days of fall. This rhythmic shift in daylight is a hallmark of Sendai's climate, painting a vibrant seasonal portrait that invites both relaxation and reflection under the summer sun.
In August, the winds in Sendai, Japan, begin to show a subtle revival after a notably calm summer. With an average wind speed of 2.2 m/s (5 mph), August's breezes are a gentle reminder of the changing seasons ahead. This slight increase marks a departure from the year's lowest wind speeds recorded in July, where the average dipped to just 1.9 m/s (4 mph). As the summer heat lingers, the winds begin to stir again, hinting at the refreshing autumnal shifts that are just around the corner. Overall, the trend of decreasing wind speeds from the previous months slowly starts to level out, inviting a soft yet invigorating atmosphere as nature transitions toward fall.
Weather in Sendai varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Sendai, focusing on differences in temperature, rainfall, humidity, and UV levels.
In August, the weather is typically warm and humid, with temperatures ranging from a minimum of 14°C (58°F) to a maximum of 35°C (95°F) and an average of 25°C (77°F). This month experiences significant precipitation, averaging 214 mm (8.4 in) over about 20 days, leading to a high humidity level of 92%. In contrast, January presents a stark departure from August, with much colder temperatures seeing a minimum of -10°C (14°F), an average of 0°C (33°F), and a maximum of 11°C (52°F). Precipitation is much lower in January, totaling around 65 mm (2.6 in) over 13 days, and humidity is also lower at 80%. For a more detailed look at what to expect in January, you can visit Sendai weather in January.
August and February present stark contrasts in weather patterns. August boasts much warmer temperatures, ranging from a minimum of 14°C (58°F) to a scorching maximum of 35°C (95°F), with an average around 25°C (77°F). Additionally, it experiences high humidity levels at 92% and significant precipitation, totaling 214 mm (8.4 in) over about 20 days. In contrast, February brings much colder conditions, with temperatures ranging from a chill of -10°C (14°F) to a maximum of 15°C (59°F) and an average of just 1°C (35°F). The month sees far less rainfall, with only 53 mm (2.1 in) spread across 12 days, and humidity levels are slightly lower at 79%. For more detailed information on February weather, you can visit Sendai weather in February.
When comparing the weather in August and March, we see a stark contrast in temperatures and overall climate conditions. August boasts a much warmer average temperature of 25°C (77°F), with highs reaching up to 35°C (95°F), while March's average lingers at a chilly 5°C (42°F), with maximum temperatures only reaching 20°C (69°F). August is also characterized by higher humidity at 92% and considerable rainfall, experiencing precipitation over 20 days totaling 214 mm (8.4 inches). In contrast, March has a significantly lower precipitation level at 112 mm (4.4 inches) across 13 days, accompanied by a humidity of 77%. For those looking for more specific information, you can find details at Sendai weather in March.
August and April present contrasting weather patterns. In August, temperatures soar with an average of 25°C (77°F), peaking at a high of 35°C (95°F), contrasting sharply with the cooler April, which sees an average of only 10°C (50°F) and a maximum of 26°C (80°F). Rainfall is more prevalent in August, with 214 mm (8.4 in) of precipitation over 20 days, compared to April's 109 mm (4.3 in) over 12 days. Additionally, August's humidity reaches a high of 92%, making the heat feel even more intense, whereas April's humidity sits at a more comfortable 75%. For a closer look at what to expect during April, check out Sendai weather in April.
In comparing the weather in August and May, we can see significant differences in temperature and precipitation. August features much warmer temperatures, with a minimum of 14°C (58°F), an average of 25°C (77°F), and a maximum of 35°C (95°F). In contrast, May is cooler, with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 30°C (87°F), and an average of 16°C (61°F).
Precipitation levels also vary notably, as August receives a substantial 214 mm (8.4 inches) over about 20 days, while May sees less rainfall, totaling 107 mm (4.2 inches) over 13 days. Humidity is higher in August at 92%, compared to May's 80%. For more details about the weather in May, you can check Sendai weather in May.
August weather tends to be warmer and more humid than June, with average temperatures soaring to around 25°C (77°F) compared to June’s 19°C (67°F). While both months experience frequent rainfall, August sees significantly higher precipitation levels at 214 mm (8.4 in) over 20 days, whereas June has a more modest 101 mm (4.0 in) over 13 days. The humidity in August also peaks at 92%, creating a noticeably stickier atmosphere than the 87% humidity typically experienced in June. For more detailed information on June weather patterns, visit Sendai weather in June.
When comparing the weather in July and August, both months exhibit similar temperature ranges, with maximums reaching up to 35°C (95°F). However, August tends to be slightly warmer on average, with temperatures ranging from a minimum of 14°C (58°F) to an average of 25°C (77°F), while July's temperatures range from 15°C (60°F) to an average of 23°C (74°F). In terms of precipitation, July sees a bit more rainfall, totaling 232 mm (9.1 in) over 18 days, compared to August's 214 mm (8.4 in) over 20 days. Interestingly, humidity levels remain constant at 92% for both months. For more details on July's weather, you can check this link: Sendai weather in July.
In August, temperatures range from a minimum of 14°C (58°F) to a maximum of 35°C (95°F), with an average of 25°C (77°F). The month is quite humid, with 92% humidity and significant precipitation of 214 mm (8.4 in) over 20 days. In contrast, September sees a drop in temperatures, with a minimum of 8°C (47°F) and a maximum of 33°C (92°F), averaging 21°C (69°F). Precipitation also decreases to 150 mm (5.9 in) over 14 days, accompanied by lower humidity at 86%. For more details, you can check Sendai weather in September.
August and October exhibit notable differences in weather patterns. In August, temperatures soar with an average of 25°C (77°F) and highs reaching up to 35°C (95°F), while the humidity peaks at a sweltering 92%. The month is also characterized by significant precipitation, totaling 214 mm (8.4 in) over 20 days, which contributes to a muggy atmosphere. In contrast, October brings a much cooler climate, with average temperatures dropping to 15°C (59°F) and maximums of 27°C (81°F). Although rainfall remains somewhat high at 208 mm (8.2 in), it occurs over fewer days (12), resulting in a drier feel compared to August. The humidity also decreases to 82%, making October a more comfortable month overall. For more detailed insights on October weather, you can check out Sendai weather in October.
August and November present striking contrasts in weather. In August, temperatures soar with a minimum of 14°C (58°F), averaging 25°C (77°F), and reaching a maximum of 35°C (95°F). This month is also characterized by high humidity at 92% and significant rainfall, totaling 214 mm (8.4 in) over 20 days. In contrast, November brings a chill, with temperatures dipping as low as -3°C (27°F) and averaging around 9°C (48°F), while maxing out at a pleasant 21°C (69°F). Precipitation is much lighter in November, with only 40 mm (1.6 in) over 9 days and a lower humidity level of 79%. For a more detailed look at what to expect, check out Sendai weather in November.
August and December paint two contrasting pictures of weather conditions. In August, temperatures soar with an average high of 35°C (95°F) and a humid atmosphere characterized by a staggering 92% humidity level. Precipitation is frequent, with rain falling on 20 days and totaling 214 mm (8.4 inches), making it one of the wettest months of the year. In stark contrast, December presents a much cooler climate, with average temperatures hovering around 3°C (37°F) and maximums reaching only 16°C (61°F). The precipitation in December is significantly lower at 67 mm (2.6 inches) over 16 days, accompanied by a humidity level of 80%. For those interested in a deeper look, you can find more about Sendai weather in December.
In August, Sendai experiences a vibrant and humid climate, distinctly warmer than the cooler months that precede it. With temperatures rising significantly, the city offers a noticeable contrast, characterized by a combination of sweltering highs and mild lows. However, this warmth is accompanied by frequent rainfall, as August sees more precipitation days than many other months, contributing to its lush summer ambiance. The high humidity can make the heat feel even more intense, prompting a shift in both daily activities and attire. For those intrigued by the subtleties of Sendai's seasonal changes, more details can be found at Sendai Climate.