Osaka, Japan Climate & Monthly Averages
The climate of Osaka
Weather in Osaka is shaped by its humid subtropical climate - expect hot, humid summers and generally mild winters. August afternoons typically reach 90°F (32°C), while January highs hover near 48°F (9°C). Annual precipitation averages 69.2 inches (1758 mm) over about 128 rainy days.
Climate quick facts
- Hottest month: August - highs near 90°F (32°C)
- Coldest month: January - highs near 48°F (9°C)
- Record high: 103°F (39°C) · Record low: 19°F (-7°C) (2015–2024)
- Wettest month: July (16 rainy days) · Sunniest: August (10.6 h sun/day)
- Climate type: humid subtropical - hot, humid summers and generally mild winters
Temperatures through the year
The warmest stretch of the year centers on August. Highs average 90°F (32°C) and overnight lows stay near 78°F (25°C). The coolest month is January, with typical highs of 48°F (9°C) and lows around 34°F (1°C). Based on 2015–2024 weather data, temperatures have reached as high as 103°F (39°C) and dropped as low as 19°F (-7°C).
Rain, sun and snow
July is usually the wettest month. It brings about 9.9 inches (252 mm) of rain over 16 days, while January is the driest. August brings the most sunshine, averaging 10.6 hours of sun a day. Snowfall is rare but not unheard of.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 48° | 34° | 7 | 2.3 in | 7.6 h/day | 74% |
| February | 50° | 35° | 7 | 2.5 in | 7.9 h/day | 72% |
| March | 57° | 40° | 11 | 4.5 in | 8.5 h/day | 72% |
| April | 66° | 49° | 10 | 6.1 in | 8.6 h/day | 73% |
| May | 74° | 58° | 11 | 6.9 in | 9.4 h/day | 73% |
| June | 80° | 66° | 14 | 9.0 in | 8.7 h/day | 78% |
| July | 87° | 75° | 16 | 9.9 in | 9.5 h/day | 81% |
| August | 90° | 78° | 14 | 6.6 in | 10.6 h/day | 75% |
| September | 84° | 71° | 14 | 8.6 in | 8.5 h/day | 77% |
| October | 73° | 58° | 10 | 7.0 in | 8.1 h/day | 76% |
| November | 63° | 48° | 8 | 3.3 in | 7.8 h/day | 77% |
| December | 53° | 38° | 7 | 2.4 in | 7.7 h/day | 74% |
Osaka month by month
Osaka weather in January
January brings highs around 48°F (9°C), lows near 34°F (1°C), about 7 wet days - typically the coldest month and the driest month of the year in Osaka.
Osaka weather in February
February brings highs around 50°F (10°C), lows near 35°F (1°C), about 7 wet days.
Osaka weather in March
March brings highs around 57°F (14°C), lows near 40°F (4°C), about 11 wet days.
Osaka weather in April
April brings highs around 66°F (19°C), lows near 49°F (10°C), about 10 wet days.
Osaka weather in May
May brings highs around 74°F (23°C), lows near 58°F (14°C), about 11 wet days.
Osaka weather in June
June brings highs around 80°F (26°C), lows near 66°F (19°C), about 14 wet days.
Osaka weather in July
July brings highs around 87°F (30°C), lows near 75°F (24°C), about 16 wet days - typically the wettest month of the year in Osaka.
Osaka weather in August
August brings highs around 90°F (32°C), lows near 78°F (25°C), about 14 wet days - typically the hottest month and the sunniest month of the year in Osaka.
Osaka weather in September
September brings highs around 84°F (29°C), lows near 71°F (22°C), about 14 wet days.
Osaka weather in October
October brings highs around 73°F (23°C), lows near 58°F (14°C), about 10 wet days.
Osaka weather in November
November brings highs around 63°F (17°C), lows near 48°F (9°C), about 8 wet days.
Osaka weather in December
December brings highs around 53°F (12°C), lows near 38°F (3°C), about 7 wet days.
Seasons in Osaka
Spring (March through May)
Spring in Osaka stays on the cool side of mild, with daytime highs averaging 66°F (19°C) and nights around 49°F (10°C); expect showers on roughly 32 days across the season.
Summer (June through August)
Summer in Osaka is hot, with daytime highs averaging 85°F (30°C) and nights around 73°F (23°C); expect showers on roughly 44 days across the season. With the humidity factored in, afternoons often feel hotter than the thermometer reads - run the numbers through the humidity and dew point converter to see why.
Fall (September through November)
Fall in Osaka is pleasantly warm, with daytime highs averaging 73°F (23°C) and nights around 59°F (15°C); expect showers on roughly 32 days across the season.
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.
Climate questions, answered
What is the average temperature in Osaka?
Is Osaka hot in summer?
Is Osaka cold in winter?
How many rainy days does Osaka get in a year?
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 typically sit near 69°F (21°C).
Pack for Osaka with lightweight, breathable clothing and strong sun protection for the hot months; a warm jacket and layers for the cooler season; a compact umbrella or rain shell - showers are a regular feature; moisture-wicking fabrics to cope with the humidity. Evenings can feel noticeably cooler than afternoons - August nights average 78°F (25°C).
Osaka temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.