Weather in Hawaii, United States in September

So you're interested in going to Hawaii, United States in September

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

Temperature in Hawaii in September

The average maximum temperature in Hawaii in September is 29°. The average maximum temperature is 29° in the previous month and 29° in the next month.

The average temperature in Hawaii in September is 26°. The average temperature ranges is 26° in the previous month and 25° in the next month.

The average minimum temperature in Hawaii in September is 22°. The minimum temperature is 23° in the previous month and 22° in the next month.

Sunshine in Hawaii in September

The average day light hours per day in Hawaii in September are 12.3 and there are 7.3 hours of sunshine per day on average during September making it a quite sunny month with some cloud cover.

The ultraviolet index in Hawaii in September is typically 11.9 during September. An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. 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 Hawaii in September

The average sea water temperature in Hawaii in September is 27.4° which is very warm and ideal for relaxing and swimming for the whole day.

Rainfall in Hawaii in September

The average total rainfall in Hawaii in September is 9.6cm and on average there are 16.8 rainy days in September making it a wet time to visit the beach.

Humidity in Hawaii in September

The maximum dew point (an indicator of humidity) in Hawaii in September is 21° which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan. The dew point is 21° in the previous month and 21° in the next month.

The average maximum relative humidity in Hawaii in September is typically 83.8%. The maximum relative humidity is 82.9% in the previous month and 85.4% in the next month.

The average relative humidity in Hawaii in September is typically 70.2%. The average relative humidity is 69.5% in the previous month and 72.1% in the next month.

Wind Speed in Hawaii in September

The average maximum wind speed in Hawaii in September is typically 28kmh. The average maximum wind speed is 29kmh in the previous month and 26kmh in the next month.

The average wind speed in Hawaii in September is typically 14kmh. The average wind speed is 16kmh in the previous month and 13kmh in the next month.

The average wind direction in Hawaii in September is from the East-Northeast.

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