Okinawa in September: weather, what to wear and what's on

Okinawa weather in September

Averages for 1991–2020 at the JMA's Naha station (28 m above sea level).

High

30.6°C (87°F)

Low

25.8°C (78°F)

Precipitation

275.2 mm

Wet days

11.8 days

Sunshine

181 hours

Highs fall 1.2°C from August and drop another 2.5°C into October.

That is 4.6°C above Naha's yearly average high of 26.0°C.

Of our 14 places with temperature records, Naha is the warmest in September, 1.1°C warmer than Osaka.

September is Naha's 2nd wettest month (275.2 mm).

Of our 15 places, Naha has the 3rd highest precipitation in September: 24.3 mm less than Nikko and 10.5 mm more than Kawaguchiko.

Rain of 1 mm or more falls on 11.8 days, and 10 mm or more on 5.2 days.

Rain of 30 mm or more in one day falls on 2.5 days, and 50 mm or more on 1.7 days, including 0.6 days with 100 mm or more.

21.2 days reach 30°C or more.

On 22.6 nights the low stays at 25°C or above.

The sun is out for 40% or more of the possible hours on 19.8 days, and 1.5 days have under 0.1 hours of sunshine.

By the JMA's cloud records, 0.5 days are clear and 8.6 are overcast.

On 15 September 2027 the sun rises at 6:15 and sets at 18:34 in Naha, giving 12 hours 19 minutes of daylight (NAOJ).

Average temperature

27.9°C (82°F)

Humidity

75%

Days of 25°C or more

30.0 days

Early, mid and late September

By the last ten days of September the average high in Naha is 1.2°C lower than in the first ten.

By ten-day totals, 1–10 September is the wettest (105.4 mm) and 11–20 September the driest (73.2 mm).

What to wear in Okinawa in September

Hot: highs around 30.6°C

This is for Naha (28 m above sea level).

• Short sleeves and light, breathable clothes. A light layer for cold air-conditioning on trains and in shops.
• Heat: 21.2 days reach 30°C or more. A hat, water and sunscreen.
• Warm nights: on 22.6 nights the temperature stays at 25°C or above.
• Humidity averages 75%: quick-dry fabrics are more comfortable.
• An umbrella: rain falls on 11.8 days.

Pack

• Umbrella
• Hat, sunscreen and a water bottle
• Quick-dry clothes
• A light layer for air-conditioning

• Our clothing rules

Rainy season and typhoons

In an average September, 1.9 typhoons come within 300 km of the Okinawa region; across Japan, 3.3 come within 300 km and 1.0 make landfall (JMA, 1991–2020).

September records in Okinawa

The extremes the JMA has measured in September at its Naha station.

Hottest September day

34.6°C (94°F) on 12 September 2009 (records since 1890)

Coldest September night

17.0°C (63°F) on 19 September 1919 (records since 1890)

Wettest September day

411.5 mm on 22 September 1999 (records since 1890)

Holidays and crowds in September

National holidays in September 2027:

• Mon 20 September — Respect for the Aged Day
• Thu 23 September — Autumnal Equinox Day

• Sat 18 September to Mon 20 September: 3 days off in a row

In September 2025, hotels and inns across Okinawa Prefecture were 62.6% full on average (4th busiest of 12 months). Foreign guests spent 894,190 nights there that month (Japan Tourism Agency). That compares with 66.4% in August and 66.6% in October.

• Japan in September: visitor numbers and busy travel days
• Holidays in September
• Silver Week

What's on in Okinawa in September

Okinawa before and after September

• Okinawa in August
• Okinawa in October
• All 12 months in Okinawa

Other places in September

• All 15 places in September

Related items

• Okinawa by month
• Japan in September
• Okinawa in August
• Okinawa in October