Osaka, Japan Weather
Osaka hourly forecast: next 24 hours
Today's high of 80°F (26°C) is about 4°F (2°C) below the typical September high of 84°F (29°C).
Current conditions in detail
Osaka weather tomorrow (Thursday, September 17)
Tomorrow in Osaka looks sunny, with a high of 83° and an overnight low of 70°. Rain is unlikely (9% chance). Winds top out near 13 mph, and the UV index reaches 6 (high).
Osaka 14-day forecast
About the weather in Osaka
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.
Osaka weather: quick facts
- 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%
Temperatures through 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.
Rain, sun and snow
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.
Season by season
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.
Average temperatures in Osaka by month
| 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% |