Haiku (HI) Weather & Climate: Best Time to Visit

With minimal seasonal shifts, Haiku experiences a constant climate year-round. Typically, average maximum daytime temperatures range from a comfortable 28°C (82°F) in September to a comfortable 25°C (77°F) in the coolest month, February.

Nights vary from 23°C (73°F) in September to around 20°C (68°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Haiku receives mid-range precipitation levels, with 916 mm (36 in) annually. Haiku offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month March (104 mm (4.1 in)) and the driest month June (58 mm (2.3 in)) is not too significant. For more details, please visit our Haiku Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Haiku offers a pleasant mix of sunny and slightly overcast days. The difference in sunshine hours between July (9.8 hours daily) and February (7.0 hours daily) provides a bit of variety for visitors and residents.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The mean water temperature over the year ranges from 24°C (75°F) in January to 27°C (81°F) in September.

Water temperature over the year

The relative humidity is high throughout the year in Haiku.

The city experiences its highest humidity in January, reaching 78%. In August, the humidity drops to its lowest level at 69%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year

The mean wind speed over the year ranges from 4 m/s (8 knots) in January, February, October, November and December to 6 m/s (12 knots) in June, July and August. What does this mean?

The mean monthly wind speed over the year (meters per second)