Osaka Climate — Average Highs, Lows & Rainfall by Month
Osaka has a temperate climate with four distinct seasons. Daytime temperatures average 33°C / 92°F in August, the warmest month, and drop to 9°C / 48°F in January, the coldest. Overnight lows in January average 1°C / 33°F. Osaka receives about 1752 mm of rain a year across roughly 132 wet days, with June the wettest month.
Averages for 2021–2025 · Open-Meteo Historical Weather API (ERA5 reanalysis) · Updated 2026-10-05
Monthly averages in Osaka
Average daytime high, overnight low and rainfall for each month of the year.
| Month | Avg high | Avg low | Rainfall | Wet days |
|---|---|---|---|---|
| January | 9°C / 48°F | 1°C / 33°F | 42 mm | 6 |
| February | 10°C / 50°F | 1°C / 35°F | 61 mm | 7 |
| March | 15°C / 58°F | 5°C / 41°F | 123 mm | 11 |
| April | 20°C / 67°F | 10°C / 50°F | 158 mm | 11 |
| May | 23°C / 73°F | 14°C / 58°F | 235 mm | 13 |
| June | 27°C / 80°F | 20°C / 67°F | 253 mm | 14 |
| July | 32°C / 90°F | 25°C / 77°F | 202 mm | 16 |
| August | 33°C / 92°F | 26°C / 79°F | 206 mm | 17 |
| September | 30°C / 87°F | 23°C / 73°F | 197 mm | 14 |
| October | 24°C / 74°F | 15°C / 59°F | 135 mm | 10 |
| November | 18°C / 64°F | 9°C / 48°F | 97 mm | 7 |
| December | 12°C / 53°F | 3°C / 38°F | 44 mm | 6 |
Best time to visit Osaka
October, April, May offer the most comfortable weather in Osaka: mild daytime temperatures with the year's lowest rainfall — October averages 24°C (74°F); April averages 20°C (67°F); May averages 23°C (73°F).
Osaka climate FAQ
- What is the hottest month in Osaka?
- August is the hottest month in Osaka, with average daytime highs of 33°C / 92°F and overnight lows of 26°C / 79°F (averages for 2021–2025).
- What is the coldest month in Osaka?
- January is the coldest month in Osaka, with average highs of 9°C / 48°F and lows of 1°C / 33°F.
- How much rain does Osaka get a year?
- Osaka receives about 1752 mm of rainfall a year, spread over roughly 132 wet days. June is the wettest month (253 mm on average) and January the driest (42 mm).
- When is the best time to visit Osaka?
- October, April, May are the most comfortable months in Osaka: mild daytime temperatures with the least rainfall of the year.
Want today's conditions instead of averages?
See live weather in Osaka →Source: Open-Meteo Historical Weather API (ERA5 reanalysis), Open-Meteo. Averages are daily means across 2021–2025 and are rounded for display — for a live forecast see the Osaka weather page.