Osaka in August: weather, what to wear and what's on

Osaka weather in August

Averages for 1991–2020 at the JMA's Osaka station (23 m above sea level).

High

33.7°C (93°F)

Low

25.8°C (78°F)

Precipitation

113.0 mm

Wet days

7.2 days

Sunshine

222 hours

Highs are 1.9°C above July and 4.2°C above September.

That is 12.4°C above Osaka's yearly average high of 21.3°C.

Of our 14 places with temperature records, Osaka is the warmest in August, level with Kyoto.

August is Osaka's 6th wettest month (113.0 mm).

Of our 15 places, Osaka gets the least precipitation in August: 13.8 mm less than Sapporo.

Rain of 1 mm or more falls on 7.2 days, and 10 mm or more on 3.2 days.

Rain of 30 mm or more in one day falls on 1.0 days, and 50 mm or more on 0.5 days.

28.3 days reach 30°C or more, and 9.9 reach 35°C or more.

On 21.4 nights the low stays at 25°C or above.

The sun is out for 40% or more of the possible hours on 21.9 days, and 0.9 days have under 0.1 hours of sunshine.

By the JMA's cloud records, 1.1 days are clear and 10.8 are overcast.

On 15 August 2027 the sun rises at 5:18 and sets at 18:47 in Osaka, giving 13 hours 29 minutes of daylight (NAOJ).

Average temperature

29.0°C (84°F)

Humidity

66%

Days of 25°C or more

31.0 days

Early, mid and late August

By the last ten days of August the average high in Osaka is 1.3°C lower than in the first ten.

By ten-day totals, 21–31 August is the wettest (46.2 mm) and 1–10 August the driest (29.9 mm).

What to wear in Osaka in August

Hot: highs around 33.7°C

• Short sleeves and light, breathable clothes. A light layer for cold air-conditioning on trains and in shops.
• Heat: 28.3 days reach 30°C or more. A hat, water and sunscreen.
• Warm nights: on 21.4 nights the temperature stays at 25°C or above.
• A folding umbrella: rain falls on 7.2 days.

Pack

• Folding umbrella
• Hat, sunscreen and a water bottle
• A light layer for air-conditioning

• Our clothing rules

Rainy season and typhoons

In an average August, 0.7 typhoons come within 300 km of the Kinki region; across Japan, 3.3 come within 300 km and 0.9 make landfall (JMA, 1991–2020).

August records in Osaka

The extremes the JMA has measured in August at its Osaka station.

Hottest August day

39.1°C (102°F) on 8 August 1994 (records since 1883)

Coldest August night

13.6°C (56°F) on 28 August 1884 (records since 1883)

Wettest August day

174.7 mm on 30 August 1896 (records since 1883)

Holidays and crowds in August

National holidays in August 2027:

• Wed 11 August — Mountain Day

In August 2025, hotels and inns across Osaka Prefecture were 80.7% full on average (5th busiest of 12 months). Foreign guests spent 1.96 million nights there that month (Japan Tourism Agency). That compares with 74.9% in July and 83.4% in September.

• Japan in August: visitor numbers and busy travel days
• Holidays in August
• Obon

What's on in Osaka in August

Osaka before and after August

• Osaka in July
• Osaka in September
• All 12 months in Osaka

Other places in August

• All 15 places in August

Related items

• Osaka by month
• Japan in August
• Osaka in July
• Osaka in September