May Weather in Osaka, Japan

Last updated: August 21, 2025

In May, Osaka, Japan experiences a delightful transition into warm weather, with maximum temperatures reaching up to 31°C (88°F) and an average of 20°C (69°F), making it a comfortable time to explore the city. The nights can be cooler, dipping to a minimum of 8°C (47°F), so layering is advisable. Humidity levels soar to 83%, creating a vibrant yet slightly muggy atmosphere. Visitors should be prepared for occasional rainfall, with about 150 mm (5.9 in) of precipitation spanning 10 days, adding a refreshing touch to the lush landscapes. Overall, May in Osaka offers a perfect mix of warmth and greenery, ideal for outdoor activities and cultural experiences.

May Temperature in Osaka

In May, Osaka transitions into the warmth of spring, showcasing a delightful rise in temperatures that invigorates both the city and its visitors. With minimums starting at a comfortable 8°C (47°F) and peaking at a balmy 31°C (88°F), the average temperature settles around 20°C (69°F), making it an ideal time for outdoor activities and cultural exploration. This month marks a distinct upswing compared to the cooler April, with daytime highs making a significant leap, illustrating the shift towards the summer months ahead. The pleasant climate invites locals and tourists alike to enjoy the blooming scenery and vibrant festivals, solidifying May as one of Osaka's most charming times of the year.

May Weather in Osaka: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Osaka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Osaka, May typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec424351596874828577675647
Data source: Temperature data for Osaka generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Osaka

May marks a significant uptick in precipitation in Osaka, Japan, with an average of 150 mm (5.9 in), making it one of the wettest months of the year. This increase reflects a steady trend observed from the previous months, as rainfall jumps from 135 mm (5.3 in) in April. Notably, May also features 10 rainy days, indicating persistent showers that contribute to the overall lushness of the landscape. As the city transitions into the early summer months, this trend of increased precipitation sets the stage for even wetter conditions in June and July, underscoring the region's dynamic climatic patterns.

May Precipitation Trends in Osaka

The chart displays monthly precipitation patterns in Osaka, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Osaka, May typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec46601091351501472821831692304457
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Osaka

As spring transitions into summer, May in Osaka brings a notable increase in humidity, reaching 83%—a rise that marks a shift from the drier conditions of early spring. This jump not only contributes to a lush, vibrant atmosphere throughout the city but also sets the stage for the higher humidity levels that will follow in June and July. As the month unfolds, residents and visitors alike can expect a warm, muggy environment that reflects the region's transitional climate, with humidity steadily escalating toward the sweltering heights typical of summer. The steady rise from the 74% in March to May's 83% encapsulates Osaka's distinct seasonal rhythm, offering both challenges and delights as nature comes to life.

May Average Humidity in Osaka

This chart illustrates the average monthly humidity levels in Osaka, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Osaka is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%74%76%83%87%93%91%87%85%83%83%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Osaka

In May, Osaka experiences an extreme UV Index of 11, maintaining the intensity seen throughout April. This marks a significant increase from the earlier months of the year, where the UV Index notably escalated from a moderate 4 in January to a high 6 in February, and then sharply rising to 11 by April. With a minimal burn time of just 10 minutes, outdoor enthusiasts should remain vigilant and apply sunscreen liberally when enjoying the vibrant spring atmosphere. As the UV levels stay consistently high leading into June and July, it's crucial to stay informed about the UV Index for safe sun exposure in Osaka. For detailed UV readings, check out Osaka UV Index.

Maximum UV Index Levels in Osaka for May

The chart shows the monthly maximum UV Index (UVI) for Osaka in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Osaka typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468111111121110753
Data source: Osaka May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

May Sunshine in Osaka

May in Osaka welcomes an impressive 291 hours of sunshine, marking the peak of spring's radiant embrace. Following the upward trend from 185 hours in January to a blossoming 279 hours in April, May shines even brighter, emphasizing the city's blossoming beauty and vibrant outdoor culture. As the weather warms, residents and visitors alike revel in the longer, sunlit days, setting the stage for lively festivals and lush gardens. While the summer months shift into higher gear with 305 hours of sunshine in August, May stands out as a delightful precursor, offering a perfect balance of warmth and brightness, and inviting everyone to enjoy Osaka's picturesque parks and lively streets.

Monthly Sunshine Duration in Osaka: May Highlighted

The May sunshine duration represents the total number of hours Osaka experiences direct sunlight during the month of May, excluding cloudy or obstructed periods. This chart compares the sunshine duration of May with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec185h229h265h279h291h268h258h305h242h237h236h221h
Data source: Osaka May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Osaka During May

When considering the likelihood of sunny weather in Osaka, Japan, during May, it's important to note that the chance of sunshine drops to 29%, which is significantly lower compared to the preceding months like February (52%) and even April (45%). This suggests a trend where the onset of spring begins to give way to the more humid conditions of early summer. The diminishing sunshine in May is a precursor to the rainy season, as following months such as June and July see even less sun, with probabilities declining to 24% and 32%, respectively. So, while May may still offer some bright days, it marks the transition towards a wetter season where cloudy skies become more frequent.

Percentage of Sunny Days in May in Osaka

The chart illustrates the percentage of sunny days in Osaka throughout the year, with May highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Osaka experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec49%52%41%45%29%24%32%28%30%53%52%57%
Data source: Osaka May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Osaka in May

As spring transitions into summer in Osaka, the daylight duration experiences a noticeable increase, peaking in June with 14 hours of sunlight. May, with its 13 hours of daylight, continues this upward trend, fostering a vibrant atmosphere as flowers bloom and outdoor activities abound. The gradual extension of daylight from 10 hours in January and February to 13 hours in both April and May not only brightens the days but also enhances the sense of renewal that spring brings. As summer approaches, residents and visitors alike revel in the longer evenings, marking a significant shift in the city's rhythm and lifestyle. The pattern of increased daylight emphasizes the allure of Osaka during the warmer months, inviting exploration and adventure until the daylight begins to wane again in the fall.

Average Daylight Hours in Osaka for May

The chart illustrates the variation in daylight duration in Osaka throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 5m10h 54m11h 58m13h 3m13h 58m14h 25m14h 12m13h 24m12h 21m11h 16m10h 20m9h 51m
Data source: Osaka daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Osaka

In May, the average wind speed in Osaka hovers around 2.7 m/s (6 mph), maintaining consistency seen since April. This gentle breeze provides a refreshing contrast to the warming temperatures of spring, fostering an inviting atmosphere for outdoor activities. Interestingly, as the year progresses towards the humid summer months, wind speeds generally decrease, with June settling at a calmer 1.8 m/s (4 mph). The trend indicates a notable shift from the slightly brisker winds experienced in the earlier months of the year. Overall, May in Osaka is characterized by a comfortable breeze, making it an ideal time to enjoy the city's beautiful parks and cherry blossoms before the heat takes hold.

Average May Wind Speed in Osaka

The chart displays monthly wind speed patterns in Osaka, with values for each month shown alongside May's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how May's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.93.12.72.72.7 m/s1.82.02.42.22.22.32.8
Data source: Osaka May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Osaka Compares to Other Months

Weather in Osaka varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Osaka, focusing on differences in temperature, rainfall, humidity, and UV levels.

May and January present strikingly different weather patterns. In May, temperatures range from a mild 8°C (47°F) to a warm 31°C (88°F), with an average of 20°C (69°F), while January experiences much colder conditions, with temperatures spanning from -3°C (26°F) to a maximum of 18°C (64°F) and averaging just 6°C (42°F). Additionally, May sees significantly more precipitation, totaling 150 mm (5.9 in) over about 10 days, compared to January's 46 mm (1.8 in) across only 6 days. Humidity levels are relatively similar, with May at 83% and January at 82%. For a detailed look at January weather in Osaka, you can visit Osaka weather in January.

May and February exhibit stark contrasts in weather. In May, temperatures typically range from a minimum of 8°C (47°F) to a maximum of 31°C (88°F), with an average of 20°C (69°F). This month experiences significant humidity at 83% and has 10 rainy days, resulting in 150 mm (5.9 in) of precipitation. In contrast, February offers much cooler conditions, with temperatures dipping as low as -3°C (26°F) and peaking at 20°C (68°F), averaging only 6°C (43°F). During this month, precipitation is lighter, averaging 60 mm (2.3 in) over 6 days, and humidity remains slightly lower at 79%. For a more detailed look, visit Osaka weather in February.

When comparing the weather in May and March, it's evident that May experiences significantly warmer temperatures, with an average of 20°C (69°F) compared to March's 10°C (51°F). The maximum temperatures in May can reach up to 31°C (88°F), making it much warmer than March's peak of 23°C (73°F). Additionally, May tends to be more humid, with a humidity level of 83% compared to March's 74%. Precipitation is also higher in May, totaling 150 mm (5.9 in) over approximately 10 days, while March sees slightly less rain at 109 mm (4.3 in) across 11 days. For more detailed information, you can check Osaka weather in March.

In comparing the weather between April and May, we see a notable increase in temperatures and humidity levels. May features a minimum temperature of 8°C (47°F) and an average temperature of 20°C (69°F), peaking at 31°C (88°F), compared to April's lower range of 3°C (37°F) to a maximum of 26°C (79°F) with an average of 15°C (59°F). Additionally, May experiences slightly higher precipitation at 150 mm (5.9 in) over 10 days, compared to April's 135 mm (5.3 in) during the same number of days. The humidity also rises in May, reaching 83%, while April maintains a lower level of 76%. This shift signifies a transition into a warmer and more humid period. For more detailed insights on April weather, you can visit Osaka weather in April.

May and June both bring mild to warm temperatures, but June tends to be slightly warmer on average. In May, temperatures range from a minimum of 8°C (47°F) to a maximum of 31°C (88°F), with an average of 20°C (69°F). In comparison, June presents a higher temperature range, with a minimum of 14°C (58°F) and a maximum of 32°C (89°F), resulting in an average of 24°C (75°F). Precipitation levels are fairly similar, with May receiving 150 mm (5.9 in) over 10 days and June slightly lower at 147 mm (5.8 in) over 12 days. Humidity also increases in June, peaking at 87% compared to May’s 83%. For more detailed information, you can visit Osaka weather in June.

In May, temperatures start to warm up with a minimum of 8°C (47°F) and an average of 20°C (69°F), reaching a maximum of 31°C (88°F). The month experiences about 150 mm (5.9 in) of precipitation over 10 days, accompanied by a relatively high humidity level of 83%. In contrast, July is significantly warmer, with a minimum temperature of 20°C (69°F) and an average of 28°C (82°F), peaking at a scorching 37°C (99°F). However, July also sees increased rainfall, totaling 282 mm (11.1 in) over 18 days, and an even higher humidity level of 93%. For more detailed insights, check out Osaka weather in July.

May and August present distinct contrasts in weather patterns. May has a milder average temperature of 20°C (69°F), with minimums dipping to 8°C (47°F) and maximums reaching 31°C (88°F). However, it experiences significant rainfall, totaling 150 mm (5.9 in) over 10 days, and a humidity level of 83%. In contrast, August is warmer, with an average temperature of 29°C (85°F), and lows of 19°C (66°F) and highs soaring to 38°C (101°F). Additionally, precipitation increases slightly to 183 mm (7.2 in) over 12 days, accompanied by higher humidity at 91%. For more details on August weather, you can check Osaka weather in August.

May and September showcase quite distinct weather patterns. In May, temperatures range from a cool 8°C (47°F) at night to a warm 31°C (88°F) during the day, with an average temperature of 20°C (69°F). The month typically sees about 150 mm (5.9 in) of precipitation spread over 10 days and boasts a humidity level of 83%.

In contrast, September experiences warmer temperatures with a minimum of 15°C (59°F), an average of 25°C (78°F), and can peak at a scorching 37°C (99°F). It also has slightly higher precipitation, totaling 169 mm (6.7 in) over 15 days, and a marginally higher humidity of 87%. For a deeper dive into September weather specifics, check out Osaka weather in September.

May and October in Osaka showcase similar average temperatures, hovering around 20°C (68°F), but each month has its unique characteristics. In May, temperatures range from a minimum of 8°C (47°F) to a maximum of 31°C (88°F), with an average humidity of 83% and around 150 mm (5.9 in) of precipitation over approximately 10 days. In contrast, October brings slightly cooler mornings, with minimum temperatures dropping to 8°C (46°F), and it can also be warmer in the afternoons, peaking at 33°C (91°F). October experiences a greater amount of rainfall, accumulating about 230 mm (9.0 in) over about 12 days, and a marginally higher humidity rate of 85%. For more insights on October's climate specifics, refer to Osaka weather in October.

May and November exhibit notable differences in weather patterns. In May, temperatures range from a pleasant minimum of 8°C (47°F) to a warm maximum of 31°C (88°F), with an average of 20°C (69°F). This month also sees higher precipitation, totaling 150 mm (5.9 in) over about 10 days, accompanied by high humidity at 83%. In contrast, November is cooler, with temperatures varying from a minimum of 2°C (35°F) to a maximum of 25°C (78°F), averaging 13°C (56°F). The month experiences significantly less rainfall, at 44 mm (1.7 in) over just 6 days, while maintaining the same humidity level of 83%. For more specifics on November weather, you can visit Osaka weather in November.

May and December present contrasting weather patterns in terms of temperature, precipitation, and overall climate experience. In May, temperatures range from a comfortable 20°C (69°F) on average, reaching highs of 31°C (88°F), accompanied by relatively high humidity levels at 83%. This month also sees more rainfall, with 150 mm (5.9 inches) falling over about 10 days. In contrast, December offers a cooler climate, with average temperatures around 8°C (47°F) and maximums of 22°C (71°F), while the minimum dips to -1°C (30°F). Rainfall decreases significantly to 57 mm (2.2 inches) over only 6 days, yet humidity remains consistent at 83%. For those interested in more detailed weather specifics for the cold month, you can visit Osaka weather in December.

Compare Osaka's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Osaka

As May unfolds in Osaka, the city experiences a delightful shift in weather, transitioning from the cool breezes of spring to the warmth of early summer. With temperatures rising significantly and humidity levels peaking at an average of 83%, the atmosphere becomes tropical, though still quite pleasant. Unlike the cooler months, May sees an increase in precipitation, contributing to the vibrant greenery and blooming flora that define the season. With approximately 10 rainy days throughout the month, visitors can expect a mix of sunny spells and refreshing showers, which helps create a lively ambiance throughout the city. For a more in-depth exploration of Osaka's weather patterns, visit Osaka Climate.