Climate Insights for Diamond Head / Kapahulu / Saint Louis Heights

The climate in Diamond Head / Kapahulu / Saint Louis Heights is warm and mild. The average annual temperature is 24°C and approximately 319mm of precipitation falls per year. December is the wettest month, receiving around 51mm of rainfall. Diamond Head / Kapahulu / Saint Louis Heights is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, August, October. The coldest months are February, March, January, when temperatures can drop to 22°C.

Diamond Head / Kapahulu / Saint Louis Heights has relatively stable temperatures year-round, staying within a 5°C range. The warmest month is September, when average highs reach 27°C and the mean temperature sits around 26°C. February is the coolest month, with minimum temperatures around 22°C and an average of 23°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows.

Diamond Head / Kapahulu / Saint Louis Heights is a quite dry location, receiving approximately 319mm of precipitation annually, which averages out to around 27mm per month. The wettest month is December, averaging 51mm of rainfall. February and March also tend to see above-average precipitation. The driest month is July, with just 11mm. That's 40mm less than December, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.

Diamond Head / Kapahulu / Saint Louis Heights is moderately windy, with an average annual wind speed of 24km/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 29km/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. There is moderate seasonal variation in wind speed, with a 9km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 22km/h in winter, 23km/h in spring, 27km/h in summer, 23km/h in autumn.

It is currently summer in Diamond Head / Kapahulu / Saint Louis Heights, which began on June 21, 2026. Diamond Head / Kapahulu / Saint Louis Heights 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 22°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Diamond Head / Kapahulu / Saint Louis Heights is during January, February, March, April, May, June, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 32mm per month. By contrast, September can be uncomfortably hot with temperatures reaching 27°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Diamond Head / Kapahulu / Saint Louis Heights 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.