Last updated: August 21, 2025
August brings a sweltering climate to both the USA and Japan, with temperatures soaring to a maximum of 35°C (95°F) and averaging around 28°C (83°F). Nights provide a mild reprieve, dipping to a minimum of 20°C (68°F). However, this warmth is often accompanied by substantial humidity levels reaching 91%, creating a muggy atmosphere. Rainfall is common, with an average of 224 mm (8.8 in) over 14 days, making it a month where summer activity must adapt to unpredictable weather. Whether basking in the sun or seeking shelter from the rain, August is a month of contrasts, demanding both resilience and adaptability from those who experience it.
In August, temperatures in both the USA and Japan reach their peak, reflecting the hottest part of the year. With minimums hovering around 20°C (68°F) and averages soaring to 28°C (83°F), this month embodies the warmth that summer promises. The maximum temperatures can even spike to an impressive 35°C (95°F), beckoning beach outings and sun-soaked adventures. This trend of rising temperatures from June through August illustrates a consistent climb, as both countries experience a robust summer climate. As the sweltering heat begins to dwindle in September, the notable drop in temperatures beckons the transition into fall, revealing a brief yet vibrant seasonal shift.
In August, the United States experiences a notable drop in precipitation compared to the torrential rains of July, with 224 mm (8.8 in) of rainfall recorded over 14 days. This decrease marks a significant shift, as July's 329 mm (13.0 in) suggests a peak in summer storms. Looking ahead, September typically sees a further decline in both precipitation and rainy days, mirroring the overall trend of diminishing rainfall as summer transitions to fall. In contrast, Japan often experiences varying summer rain patterns, but August generally retains substantial rainfall, contributing to the lush landscapes. The continued analysis of these precipitation trends indicates not only seasonal shifts but also the changing climate effects impacting both countries.
In August, humidity levels in the USA remain notably high at 91%, reflecting a trend that peaks during the summer months. This sharp rise begins in May with 84%, escalating through June and July, where humidity reaches a staggering 92%. As the summer heat intensifies, the air becomes increasingly saturated, leading to a sense of heaviness and discomfort. Following August, humidity gradually declines in September to 84% and continues to ease into the autumn months. This cyclical pattern emphasizes how the summer months consistently bring about elevated humidity levels, culminating in one of the year's highest points in August. In contrast, regions like Japan typically experience similar patterns, with high summer humidity contributing to a muggy atmosphere as August draws to a close.
August shines brightly with a UV Index of 12 in both the USA and Japan, marking the peak of summer's intense sun. This extreme level of UV exposure means that burn time is a mere 10 minutes, underscoring the importance of sun protection during this time. Trends show a steady rise in UV intensity from January's moderate index of 4, ramping up through the months, with March and April seeing significant jumps. As summer hits full swing, both nations enter a critical period where extreme exposure persists from June through September. Staying vigilant with sunscreen and protective clothing is crucial this August, as the high UV index emphasizes the need for awareness. For detailed insights on UV levels, visit Usa UV Index.
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August marks a peak in sunshine hours across both the USA and Japan, boasting an impressive 297 hours of sunlight, a delightful contrast to the more moderate totals seen in earlier months. As summer reaches its zenith, the sun shines brighter and longer, drawing in outdoor enthusiasts and sun-seekers alike. Following a gradual increase from January's low of 172 hours, there's a clear upward trend as the year progresses, peaking in August before tapering off towards autumn. This seasonal shift not only highlights the beauty of summer but also hints at the changing scenery as daylight diminishes into the fall months, where hours drop significantly to 248 in September and 249 in October. The rhythm of daylight throughout the year paints a vivid portrait of nature's cycles in both countries.
As we delve into the likelihood of sunny weather in August across the USA and Japan, a clear trend emerges from the data. The chance of sunshine drops to 26%, marking one of the lower probabilities for the year. This decline follows the already diminished prospects from the bustling summer months of June and July, which see only 23% and 20% likelihood of sunny days, respectively. Interestingly, as we transition into the fall, the probabilities begin to rise again, peaking at 62% in October. Thus, August stands out not only for its warmth but also for its relatively low likelihood of clear skies, making it an anomaly in the otherwise sunny summer season.
In both the USA and Japan, the rhythm of daylight throughout the year reveals a fascinating pattern, particularly noticeable in the summer months. August, for instance, typically enjoys 13 hours of daylight, a slight dip from the peak of 14 hours seen in June and July. This gradual decrease heralds the transition toward autumn, as daylight begins to wane. The trend clearly illustrates the seasonal shifts, beginning with shorter days in winter, extending to the splendidly long days of summer, and then gradually returning to the shorter durations. As we move from the bright summer afternoons to the serene autumn evenings, both nations experience a harmonious ebb and flow of sunlight that defines the changing seasons.
In the U.S. and Japan, wind speed exhibits a fascinating ebb and flow throughout the year, with August recording a notably low average of 2.2 m/s (5 mph), mirroring the calm before the autumn breeze sets in. Summer months generally show a decline, as June hits its lowest point at 2.2 m/s, while only a slight lift occurs in the transitional months of September and November. Interestingly, January starts the year off with the strongest gusts at 3.0 m/s (7 mph), showcasing the winter's chill. This trend hints at a seasonal rhythm, where both regions experience a peak in wind speed during the colder months, only to mellow into a serene summer breeze, perfectly capturing the shifting patterns of nature’s breath.
Weather in Usa varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Usa, focusing on differences in temperature, rainfall, humidity, and UV levels.
August and January present stark contrasts in weather conditions. August typically boasts warm temperatures, with minimums around 20°C (68°F) and average highs reaching up to 35°C (95°F), accompanied by high humidity levels of 91% and substantial precipitation of 224 mm (8.8 inches) over 14 days. In contrast, January is characterized by much colder temperatures, ranging from a minimum of -4°C (25°F) to a maximum of 16°C (61°F), with a significant reduction in precipitation to 52 mm (2.0 inches) spread over just 6 days and lower humidity at 75%. For more detailed insights, you can check Usa weather in January.
August and February present stark contrasts in weather conditions. August boasts a warm climate with average temperatures around 28°C (83°F) and highs reaching up to 35°C (95°F), accompanied by high humidity levels of 91%. This month also experiences significant rainfall, with 224 mm (8.8 inches) of precipitation over approximately 14 days. In contrast, February is much cooler, with average temperatures of 6°C (44°F) and maximums only reaching 20°C (68°F). Precipitation is considerably lower at 71 mm (2.8 inches), occurring over about 10 days, and the humidity is also reduced to 71%. For more specifics on February weather, you can check this link: Usa weather in February.
August and March present starkly contrasting weather conditions, reflecting the transition from summer to spring. In August, temperatures soar with a minimum of 20°C (68°F) and average highs reaching 35°C (95°F), coupled with high humidity at 91% and substantial precipitation of 224 mm (8.8 in) over 14 days. In contrast, March offers a much cooler climate with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 21°C (71°F) and an average of 11°C (51°F). The month sees less precipitation, totaling 122 mm (4.8 in) over 12 days, and lower humidity at 71%. For more insights on weather in March, you can check Usa weather in March.
In comparing the weather of August and April, it's clear that August is significantly warmer and more humid. August boasts average temperatures ranging from a minimum of 20°C (68°F) to a scorching maximum of 35°C (95°F), while April's temperatures are much milder, with highs reaching only 25°C (78°F). Additionally, August experiences higher precipitation levels, with 224 mm (8.8 in) of rain over 14 days, compared to April's 114 mm (4.5 in) over 9 days. The humidity in August is also quite high at 91%, contrasting with April's 78%. For more detailed weather information, you can visit Usa weather in April.
August weather is characterized by significantly warmer temperatures, with a minimum of 20°C (68°F) and average highs reaching up to 35°C (95°F). In contrast, May offers a cooler climate, with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 30°C (86°F). Additionally, August sees higher humidity levels at 91% compared to May's 84%. Precipitation is more frequent in August with 224 mm (8.8 in) over 14 days, while May experiences 156 mm (6.2 in) over 11 days. For more information on May weather, visit Usa weather in May.
When comparing the weather in August and June, it's clear that August tends to be warmer and more humid. In August, temperatures range from a minimum of 20°C (68°F) to a maximum of 35°C (95°F), with an average of 28°C (83°F). This contrasts with June, where temperatures range from a minimum of 16°C (61°F) to a maximum of 31°C (87°F), averaging 23°C (74°F). Both months experience similar levels of precipitation, with 224 mm (8.8 in) in August and 194 mm (7.6 in) in June, and both have about 14 days of rainfall. However, August's humidity is slightly higher at 91%, compared to June's 86%. For a detailed look at weather patterns in June, you can visit Usa weather in June.
In comparing the weather between August and July, we see that both months maintained warm temperatures, with August experiencing a slight increase in average temperature at 28°C (83°F) compared to July's 27°C (80°F). The minimum temperatures were comparable, while August recorded a slightly higher maximum of 35°C (95°F) versus July’s 34°C (93°F). However, August was noticeably less wet, with precipitation amounting to 224 mm (8.8 in) over 14 days, in contrast to July’s 329 mm (13.0 in) over 19 days. Humidity levels were very similar, remaining high at around 91% in August and 92% in July. For more details on the weather in July, you can refer to this link: Usa weather in July.
In August, the weather tends to be hotter and more humid, with average temperatures around 28°C (83°F) and maximums reaching up to 35°C (95°F). This month also experiences significant rainfall, totaling 224 mm (8.8 in) over approximately 14 days, contributing to the higher humidity levels of 91%. In contrast, September sees a notable drop in temperatures, averaging 24°C (76°F) with maximums of 33°C (91°F) and minimums around 16°C (62°F). Although it still rains, the precipitation decreases to 173 mm (6.8 in) over 15 days, leading to a decrease in humidity to 84%. For more detailed information, you can check Usa weather in September.
August typically experiences higher temperatures, with minimums around 20°C (68°F) and average highs reaching up to 35°C (95°F). This month is also characterized by considerable humidity at 91% and significant rainfall, averaging 224 mm (8.8 in) over 14 days. In contrast, October brings a noticeable drop in temperatures, with averages around 19°C (67°F) and maximums peaking at 29°C (85°F). Precipitation decreases to 138 mm (5.4 in) over just 9 days, and humidity falls to a more comfortable 83%. For a detailed overview of weather conditions in October, you can visit Usa weather in October.
August and November present stark contrasts in weather. In August, temperatures range from a minimum of 20°C (68°F) to a scorching maximum of 35°C (95°F), accompanied by high humidity at 91% and significant rainfall of 224 mm (8.8 in) over 14 days. In contrast, November brings much cooler temperatures, with a minimum of 4°C (40°F) and an average of 13°C (56°F), peaking at 26°C (79°F). Precipitation decreases dramatically to only 47 mm (1.9 in) over 6 days, and humidity remains lower at 81%. For more details on weather patterns, you can visit Usa weather in November.
August and December present vastly different weather patterns. In August, temperatures range from a minimum of 20°C (68°F) to a maximum of 35°C (95°F), with an average of 28°C (83°F). This month is characterized by high humidity at 91% and significant rainfall, totaling 224 mm (8.8 in) over 14 days. In stark contrast, December boasts much cooler temperatures, with a minimum of -1°C (31°F), an average of 8°C (46°F), and a maximum of 21°C (71°F). Additionally, December experiences lower precipitation levels at 59 mm (2.3 in) over just 8 days and a slightly lower humidity of 79%. For those interested in more detailed weather information, please refer to Usa weather in December.
August in the USA brings a unique blend of heat and humidity, setting it apart from the milder months that precede it. With temperatures reaching a sweltering 35°C (95°F), this month often feels like the peak of summer, accompanied by a high humidity level that can make the heat feel even more intense. While average precipitation remains significant, with rain falling about half the month, the oppressive mugginess frequently tops the charts, making August a month of contrasts. For those seeking more insight into the climatic patterns across the year, you can explore further at Usa Climate.