Osaka, Japan Climate & Monthly Averages
Osaka has a humid subtropical climate. August is the hottest month, averaging 90° by day; January is the coldest at 48°.
Osaka's climate is a story of contrasts
Seasons are the whole story in Osaka. The gap between an average August and an average January is 24°C - hot, humid summers and generally mild winters - which in practice means 90°F (32°C) afternoons at one end of the calendar and 48°F (9°C) at the other.
August
90° by day 78° at nightJanuary
48° by day 34° at nightThe two ends of the year
The wettest month is July (9.9 inches (252 mm) across 16 days) and the driest January. Warmth peaks in August: highs of 90°F (32°C), lows of 78°F (25°C). January sits at the other end of the year: 48°F (9°C) by day, 34°F (1°C) at night. Three of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is April through May.
Snowfall is rare but not unheard of. August is the brightest month at 10.6 hours of sun a day, against an annual average of 8.6. Between the average August and the average January lie 24°C, a wider spread than roughly 77% of the cities we track. The gridded 2015-2024 daily record for this location tops out at 103°F (39°C) and bottoms at 19°F (-7°C) - decade extremes, not all-time station records.
More climate facts for Osaka
- Hottest month: August - highs near 90°F (32°C)
- Coldest month: January - highs near 48°F (9°C)
- Decade extremes (2015-2024): 103°F (39°C) high · 19°F (-7°C) low
- Wettest month: July (16 rainy days) · Sunniest: August (10.6 h sun/day)
- Climate type: humid subtropical
- Annual swing: 24°C between the average warmest and coolest month · day to night: 8°C
- Months averaging 30°C or hotter: 2
- Average humidity: 75%
Four distinct parts of the year in Osaka
Spring (March through May)
Through spring, Osaka is crisp but comfortable: 66°F (19°C) by day, 49°F (10°C) after dark, and rain falls on around 32 of the 90 days.
Summer (June through August)
Through summer, Osaka runs hot: 85°F (30°C) by day, 73°F (23°C) after dark, and rain falls on around 44 of the 90 days. With the moisture factored in, afternoons feel hotter than the reading suggests - the humidity and dew point converter shows why.
Fall (September through November)
Fall brings comfortable warmth here - highs near 73°F (23°C), nights near 59°F (15°C), and rain falls on around 32 of the 90 days.
Winter (December through February)
Winter in Osaka is brisk and cold, with daytime highs averaging 50°F (10°C) and nights around 36°F (2°C); expect showers on roughly 20 days across the season.
Osaka temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.
Choosing a season in Osaka
Best time to visit Osaka
The best time to visit Osaka is generally April to May and October to November, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window sit near 69°F (21°C), with rain on about 10 days a month. For the same question asked the other way round, see where else is warm in April.
What to pack
Pack for Osaka with lightweight, breathable clothing and serious sun protection, a warm jacket and layers for the cooler season, a compact umbrella or rain shell and moisture-wicking fabrics for the humidity. Even in August, lows of 78°F (25°C) make an extra layer worth the space.
Monthly highs, lows and seasonal change
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 48° | 34° | 7 | 2.3 in | 7.6 h/day | 10.1 h | 22% | 74% |
| February | 50° | 35° | 7 | 2.5 in | 7.9 h/day | 10.9 h | 23% | 72% |
| March | 57° | 40° | 11 | 4.5 in | 8.5 h/day | 11.9 h | 34% | 72% |
| April | 66° | 49° | 10 | 6.1 in | 8.6 h/day | 13.0 h | 34% | 73% |
| May | 74° | 58° | 11 | 6.9 in | 9.4 h/day | 14.0 h | 35% | 73% |
| June | 80° | 66° | 14 | 9.0 in | 8.7 h/day | 14.5 h | 48% | 78% |
| July | 87° | 75° | 16 | 9.9 in | 9.5 h/day | 14.3 h | 52% | 81% |
| August | 90° | 78° | 14 | 6.6 in | 10.6 h/day | 13.4 h | 44% | 75% |
| September | 84° | 71° | 14 | 8.6 in | 8.5 h/day | 12.3 h | 48% | 77% |
| October | 73° | 58° | 10 | 7.0 in | 8.1 h/day | 11.2 h | 33% | 76% |
| November | 63° | 48° | 8 | 3.3 in | 7.8 h/day | 10.3 h | 26% | 77% |
| December | 53° | 38° | 7 | 2.4 in | 7.7 h/day | 9.8 h | 21% | 74% |
Osaka from the coldest month to the hottest
Each card shows the average high and low. The bar places that month between Osaka's coldest night and warmest afternoon.
January
- Rain
- 7 days
- Sunshine
- 7.6 h
- Daylight
- 10.1 h
February
- Rain
- 7 days
- Sunshine
- 7.9 h
- Daylight
- 10.9 h
March
- Rain
- 11 days
- Sunshine
- 8.5 h
- Daylight
- 11.9 h
April
- Rain
- 10 days
- Sunshine
- 8.6 h
- Daylight
- 13.0 h
May
- Rain
- 11 days
- Sunshine
- 9.4 h
- Daylight
- 14.0 h
June
- Rain
- 14 days
- Sunshine
- 8.7 h
- Daylight
- 14.5 h
July
- Rain
- 16 days
- Sunshine
- 9.5 h
- Daylight
- 14.3 h
August
- Rain
- 14 days
- Sunshine
- 10.6 h
- Daylight
- 13.4 h
September
- Rain
- 14 days
- Sunshine
- 8.5 h
- Daylight
- 12.3 h
October
- Rain
- 10 days
- Sunshine
- 8.1 h
- Daylight
- 11.2 h
November
- Rain
- 8 days
- Sunshine
- 7.8 h
- Daylight
- 10.3 h
December
- Rain
- 7 days
- Sunshine
- 7.7 h
- Daylight
- 9.8 h
Looking for warmer alternatives? Browse warm places by month, or compare Osaka's coolest part of the year: January, February, December.
Where Osaka sits among other climates
- Annual precipitation is 69.2 inches (1758 mm) - wetter than 88% of the 3496 cities we track.
These comparisons use the same ten-year window for every city in the dataset.