Osaka Weather

Weather — Osaka, Japan

Osaka has a temperate, humid climate with warm springs, hot humid summers and mild winters. Expect pleasant conditions for city sightseeing in spring (April–May) and autumn (October–November), a pronounced rainy season and the hottest, most humid weather — and highest sea temperatures — in July–August.

Sea temperatures rise from about 15–16 °C in winter and spring to the mid‑20s in late summer, making July–August the best months for swimming. Note also the elevated rainfall in early summer (June) and the late‑summer/early‑autumn period when heavy tropical rains or typhoons can occur.

Summer UV levels are high (peak UV in July), so pack sun protection for outdoor activities. If you’re booking flights to Osaka, aim for April–May or October for the most reliably comfortable weather.

Weather in Osaka — January

January is one of the coolest months: average highs around 9 °C and lows near 2 °C. Days are generally dry to mildly damp with limited sunshine — good for urban sightseeing with a warm layer.

Weather in Osaka — February

February remains cool (average highs ≈ 10 °C, lows about 2 °C) with slightly more rain than January. Crisp days are common and it’s still off‑peak for visitors seeking warm weather.

Weather in Osaka — March

March brings spring warmth: daytime highs near 14 °C and nights around 5 °C. Expect more frequent showers as the city transitions toward cherry‑blossom season — a popular time to visit.

Weather in Osaka — April

April is mild and pleasant with average highs about 19 °C and lows near 11 °C. Sunshine increases and temperatures are ideal for walking tours and outdoor festivals.

Weather in Osaka — May

May is comfortably warm (highs around 24 °C, lows around 16 °C) with long daylight hours. It’s an excellent month for sightseeing before the main rainy season arrives.

Weather in Osaka — June

June marks the start of the wetter season: average highs about 27 °C and lows near 20 °C, with the month seeing one of the highest monthly rain totals. Expect humid, muggy days and pack a light rain jacket.

Weather in Osaka — July

July is hot and humid with average highs around 31 °C and lows near 25 °C. Rainfall remains significant but the sea warms to about 25 °C — ideal for beach trips if you can handle the heat and humidity.

Weather in Osaka — August

August is the hottest month (highs near 33 °C, lows about 26 °C) and often very humid. Sea temperatures reach roughly 27 °C, perfect for swimming, but be prepared for intense sun, high UV and occasional heavy rain or storms.

Weather in Osaka — September

September cools slightly (average highs ≈ 29 °C, lows ≈ 22 °C) but remains humid and relatively wet — this is the tail of typhoon season, so heavy showers and stormy conditions are possible.

Weather in Osaka — October

October is comfortable and pleasant with highs around 23 °C and lows near 15 °C. Rainfall decreases versus summer and autumn colours begin to appear — a great month for city and day trips.

Weather in Osaka — November

November is mild (average highs near 17 °C, lows about 9 °C) and usually dry, making it an excellent shoulder‑season choice for lower crowds and comfortable sightseeing.

Weather in Osaka — December

December cools to highs around 11 °C and lows near 4 °C. Days are typically crisp with limited precipitation — a quieter time to explore museums, restaurants and indoor attractions.

Best time to visit: For the most reliable balance of good weather and fewer heavy rains, aim for April–May or October–November. For beachgoers, late July–August offers the warmest sea temperatures (mid‑20s °C).

Rain and storms: Osaka’s wettest period is early summer (June) and late summer/early autumn (August–September). If you travel then, expect sudden heavy showers and keep an eye on weather warnings for tropical storms or typhoons.

Packing tips: light layers for spring and autumn, breathable clothes and sun protection in summer, a warm layer for winter nights and a compact umbrella during the rainy season.

Table with temperatures throughout the year