Osaka weather by month & the best time to visit
Japan · major coastal city · humid subtropical climate
The best time to visit Osaka is May — its sunniest month (Sunshine Score 64/100), with June and July close behind. Osaka averages about 1,831 hours of sunshine a year. Daytime highs around 22°C / 72°F and roughly 138 mm of rain in May.
When is the best time to visit Osaka?
For sunshine, the best time to visit Osaka is May, then June and July. The dullest month is January (7/100, 56 mm of rain). The full month-by-month picture is in the table below.
How sunny is Osaka?
Osaka gets a moderate 1,831 hours of sunshine a year. 57 Sunshine Score points separate May (64) from January (7), so the month you pick matters. It ranks #25 of 79 destinations in Japan for annual sunshine, above the national median of 1,773 hours. The year's 1,526 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 7 | 9° / 48°F | 5° / 41°F | 56 mm | 2 | 12° / 54°F |
| February | 13 | 10° / 50°F | 5° / 41°F | 71 mm | 3 | 10° / 50°F |
| March | 29 | 13° / 55°F | 7° / 45°F | 101 mm | 4 | 11° / 52°F |
| April | 57 | 18° / 64°F | 11° / 52°F | 112 mm | 5 | 15° / 59°F |
| May | 64 | 22° / 72°F | 15° / 59°F | 138 mm | 6 | 18° / 64°F |
| June | 62 | 25° / 77°F | 20° / 68°F | 191 mm | 6 | 22° / 72°F |
| July | 62 | 29° / 84°F | 24° / 75°F | 204 mm | 7 | 27° / 81°F |
| August | 62 | 30° / 86°F | 25° / 77°F | 148 mm | 7 | 29° / 84°F |
| September | 62 | 27° / 81°F | 22° / 72°F | 194 mm | 6 | 29° / 84°F |
| October | 62 | 22° / 72°F | 17° / 63°F | 159 mm | 4 | 25° / 77°F |
| November | 56 | 17° / 63°F | 12° / 54°F | 80 mm | 3 | 20° / 68°F |
| December | 25 | 12° / 54°F | 7° / 45°F | 72 mm | 2 | 15° / 59°F |
Sea temperature in Osaka by month
The sea off Osaka is warmest in August at around 29°C / 84°F, and coolest in February at 10°C / 50°F. The water sits at a comfortable 21°C or warmer roughly 5 months a year. Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
How Osaka compares month by month: Osaka vs Nagoya · Osaka vs Kobe · Osaka vs Tokushima · Osaka vs Takamatsu · all comparisons
Osaka: questions and answers
What kind of destination is Osaka?
Osaka is a major coastal city in Japan with a humid subtropical climate — the sea reaches 29°C at its warmest and is swimmable (21°C+) about 5 months a year.
How many hours of sunshine does Osaka get a year?
Osaka gets about 1,831 hours of sunshine a year, at its best around May.
When is the best time to visit Osaka?
The sunniest time to visit Osaka is May, when the Sunshine Score peaks at 64/100 (with June and July close behind). Expect daytime highs around 22°C / 72°F.
What is the least sunny month in Osaka?
January is the least sunny month in Osaka, scoring 7/100 with about 56 mm of rain.
What is the sea temperature in Osaka?
The sea in Osaka ranges from about 10°C (February) to 29°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Osaka?
The typical midday UV index in Osaka peaks around 7 (high) in July, easing to about 2 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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