Climate Insights for Haʻikū

The climate in Haʻikū is warm and mild. The average annual temperature is 23°C and approximately 1101mm of precipitation falls per year. Haʻikū receives a notable amount of rainfall throughout the year, including during its driest month. Haʻikū is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, August, July. The coldest months are February, March, January, when temperatures can drop to 19°C.

Haʻikū has relatively stable temperatures year-round, staying within a 8°C range. The warmest month is September, when average highs reach 27°C and the mean temperature sits around 24°C. February is the coolest month, with minimum temperatures around 19°C and an average of 21°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows.

Haʻikū is a moderately rainy area, receiving approximately 1101mm of precipitation annually, which averages out to around 92mm per month. The wettest month is April, averaging 124mm of rainfall. December and March also tend to see above-average precipitation. The driest month is June, with just 60mm. That's 63mm less than April, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.

Haʻikū is moderately windy, with an average annual wind speed of 23km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 24km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in January, with average winds dropping to 20km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 22km/h in winter, 22km/h in spring, 24km/h in summer, 22km/h in autumn.

It is currently spring in Haʻikū, which began on March 20, 2026. Haʻikū is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in September at around 27°C, while the coldest stretch bottoms out in February near 19°C. Summer is next, beginning on June 21, 2026 — 83 days from now.

The best time to visit Haʻikū is during January, February, May, June, July, August, September, October and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 84mm per month. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Haʻikū based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.