Japan · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit Osaka are April, May and October, when daytime temperatures are agreeable and rainfall is relatively low.
Osaka sees its warmest weather in August, when daytime highs average around 34°C, and its coolest in January (around 10°C).
Annual precipitation totals roughly 1338mm — June is typically the wettest month (~185mm) and January the driest (~47mm).
A distinctly wetter period runs from May to October — worth planning around if you prefer dry days.
August is the sunniest month, with about 222 hours of sunshine.
🟧 avg daytime high · 🟦 dashed: avg nighttime low · bars: monthly rainfall
Daily forecast highs vs the 30-year normal — last 60 days
Each bar is one day: orange above normal, blue below.
| Month | High / Low | Rainfall | Travel rating |
|---|---|---|---|
| January | 10° / 3°C | 47mm | 🤔 Fair |
| February | 11° / 3°C | 61mm | 🤔 Fair |
| March | 14° / 6°C | 103mm | 🤔 Fair |
| April | 20° / 11°C | 102mm | 👍 Good |
| May | 25° / 16°C | 137mm | 👍 Good |
| June | 28° / 20°C | 185mm | 🤔 Fair |
| July | 32° / 25°C | 174mm | ⚠️ Challenging |
| August | 34° / 26°C | 113mm | 🤔 Fair |
| September | 30° / 22°C | 153mm | 🤔 Fair |
| October | 24° / 16°C | 136mm | 🌟 Great |
| November | 18° / 10°C | 73mm | 👍 Good |
| December | 12° / 5°C | 56mm | 🤔 Fair |
January in Osaka is chilly, with average daytime highs around 10°C (49°F) and nighttime lows near 3°C (37°F). Expect roughly 47mm of precipitation spread over about 6 rainy days, with little rainfall.
☀️ About 147 hours of sunshine over the month (~5h/day).
🎒 What to pack — jacket or coat · long-sleeve layers
February in Osaka is chilly, with average daytime highs around 11°C (51°F) and nighttime lows near 3°C (38°F). Expect roughly 61mm of precipitation spread over about 6 rainy days, with a moderate amount of rain.
☀️ About 141 hours of sunshine over the month (~5h/day).
🎒 What to pack — jacket or coat · long-sleeve layers
March in Osaka is mild, with average daytime highs around 14°C (58°F) and nighttime lows near 6°C (43°F). Expect roughly 103mm of precipitation spread over about 9 rainy days, with a moderate amount of rain.
☀️ About 172 hours of sunshine over the month (~6h/day).
🎒 What to pack — light jacket · layers for cool evenings
April in Osaka is pleasantly warm, with average daytime highs around 20°C (68°F) and nighttime lows near 11°C (52°F). Expect roughly 102mm of precipitation spread over about 9 rainy days, with a moderate amount of rain.
☀️ About 193 hours of sunshine over the month (~6h/day).
🎒 What to pack — light layers · comfortable walking shoes
May in Osaka is pleasantly warm, with average daytime highs around 25°C (77°F) and nighttime lows near 16°C (61°F). Expect roughly 137mm of precipitation spread over about 10 rainy days, and this is one of the wetter months.
☀️ About 204 hours of sunshine over the month (~7h/day).
🎒 What to pack — light layers · comfortable walking shoes · compact umbrella or rain jacket
June in Osaka is warm, with average daytime highs around 28°C (82°F) and nighttime lows near 20°C (69°F). Expect roughly 185mm of precipitation spread over about 11 rainy days, and this is one of the wetter months.
☀️ About 154 hours of sunshine over the month (~5h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
July in Osaka is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (76°F). Expect roughly 174mm of precipitation spread over about 10 rainy days, and this is one of the wetter months.
☀️ About 184 hours of sunshine over the month (~6h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
August in Osaka is hot, with average daytime highs around 34°C (93°F) and nighttime lows near 26°C (78°F). Expect roughly 113mm of precipitation spread over about 7 rainy days, and this is one of the wetter months.
☀️ About 222 hours of sunshine over the month (~7h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
September in Osaka is warm, with average daytime highs around 30°C (85°F) and nighttime lows near 22°C (71°F). Expect roughly 153mm of precipitation spread over about 10 rainy days, and this is one of the wetter months.
☀️ About 162 hours of sunshine over the month (~5h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
October in Osaka is pleasantly warm, with average daytime highs around 24°C (75°F) and nighttime lows near 16°C (61°F). Expect roughly 136mm of precipitation spread over about 8 rainy days, and this is one of the wetter months.
☀️ About 166 hours of sunshine over the month (~6h/day).
🎒 What to pack — light layers · comfortable walking shoes · compact umbrella or rain jacket
November in Osaka is mild, with average daytime highs around 18°C (64°F) and nighttime lows near 10°C (50°F). Expect roughly 73mm of precipitation spread over about 6 rainy days, with a moderate amount of rain.
☀️ About 153 hours of sunshine over the month (~5h/day).
🎒 What to pack — light jacket · layers for cool evenings
December in Osaka is chilly, with average daytime highs around 12°C (54°F) and nighttime lows near 5°C (42°F). Expect roughly 56mm of precipitation spread over about 6 rainy days, with little rainfall.
☀️ About 152 hours of sunshine over the month (~5h/day).
🎒 What to pack — jacket or coat · long-sleeve layers