Weather in Okinawa Prefecture, Japan in September

So you're interested in going to Okinawa Prefecture, Japan in September

September is a hot and slightly rainy time for sunbathing in Okinawa Prefecture. September is an excellent month for swimming in Okinawa Prefecture with very warm sea temperatures. Consider visiting Okinawa Prefecture in the months of June, July, August, September, for the best beach weather. Also consider one of our other suggestions for September.

Temperature in Okinawa Prefecture in September

The average maximum temperature in Okinawa Prefecture in September is 30°. The average maximum temperature is 31° in the previous month and 27° in the next month.

The average temperature in Okinawa Prefecture in September is 28°. The average temperature ranges is 29° in the previous month and 25° in the next month.

The average minimum temperature in Okinawa Prefecture in September is 25°. The minimum temperature is 27° in the previous month and 23° in the next month.

Sunshine in Okinawa Prefecture in September

The average day light hours per day in Okinawa Prefecture in September are 12.3 and there are 6.6 hours of sunshine per day on average during September making it a quite sunny month with some cloud cover.

The ultraviolet index in Okinawa Prefecture in September is typically 10.7 during September. An ultraviolet index reading of 8 to 10 indicates a very high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 15 minutes. Take extra precautions because unprotected skin and eyes will be damaged and can burn quickly. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.

Sea Temperature in Okinawa Prefecture in September

The average sea water temperature in Okinawa Prefecture in September is 28.5° which is very warm and ideal for relaxing and swimming for the whole day.

Rainfall in Okinawa Prefecture in September

The average total rainfall in Okinawa Prefecture in September is 2cm and on average there are 14.5 rainy days in September making it a slightly wet time to visit the beach.

Humidity in Okinawa Prefecture in September

The maximum dew point (an indicator of humidity) in Okinawa Prefecture in September is 24° which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning. The dew point is 26° in the previous month and 21° in the next month.

The average maximum relative humidity in Okinawa Prefecture in September is typically 87.3%. The maximum relative humidity is 89% in the previous month and 82.8% in the next month.

The average relative humidity in Okinawa Prefecture in September is typically 75.6%. The average relative humidity is 78% in the previous month and 71.5% in the next month.

Wind Speed in Okinawa Prefecture in September

The average maximum wind speed in Okinawa Prefecture in September is typically 26kmh. The average maximum wind speed is 26kmh in the previous month and 29kmh in the next month.

The average wind speed in Okinawa Prefecture in September is typically 18kmh. The average wind speed is 18kmh in the previous month and 21kmh in the next month.

The average wind direction in Okinawa Prefecture in September is from the East.

Monthly Averages

Suggested Beaches in September

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