Climate Chart of Rarotonga, Cook Islands
Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023
For Rarotonga, Cook Islands, the climate data cover 2013–2023. Across the year, monthly mean temperatures range from August at 20.2 °C to March at 24.0 °C, while mean daily sunshine is 9.56 hours/day. These figures sketch a generally warm annual pattern, but monthly means smooth over day-to-day conditions. Rainfall also varies through the calendar: the mean daily amount is lowest in September at 2.36 mm/day and highest in January at 7.88 mm/day. Together, the monthly figures can help frame a visit, without guaranteeing the weather on any particular day.
Climate overview
Temperature
Monthly mean temperature is lowest in August, at 20.2 °C, and reaches its highest monthly mean in March, at 24.0 °C. The mean across calendar-month means is 22.1 °C; this is not a day-weighted annual average. These are monthly averages rather than daytime highs, so they describe the broad temperature pattern, not the full range visitors may encounter from one day to another.
Rain
Mean daily rainfall reaches its highest monthly average in January, at 7.88 mm/day, and its lowest in September, at 2.36 mm/day. The unweighted mean across monthly averages is 4.56 mm/day. These are daily mean amounts, not monthly totals: the lower figure can help visitors prioritising less average rainfall choose a time to consider, but it does not guarantee dry days or indicate how frequently rain occurs. The higher figure is a useful prompt to prepare for rain, without implying that every day in that month will be wet.
Sunshine
Mean daily sunshine is lowest in July, at 8.47 hours/day, and highest in November, at 10.49 hours/day. The unweighted mean across the monthly figures is 9.56 hours/day. For outdoor sightseeing, these averages can inform expectations about typical sunshine duration, but they do not specify conditions on a particular day, and sunshine hours should not be read as day length.
Best Travel Time Guide for Rarotonga, Cook Islands: Ideal Seasons and Weather Insights
If cooler monthly-average conditions are a priority, August is the relevant option to consider, with a monthly mean temperature of 20.2 °C. For lower average daily rainfall, September is the corresponding option, at 2.36 mm/day; these are separate criteria, not a combined best-month ranking. Neither average guarantees what the weather will be during a visit. For rain preparation, the mean daily rainfall is highest in January, at 7.88 mm/day, so visitors may wish to plan with wet-weather possibilities in mind. Mean daily sunshine reaches 10.49 hours/day in November and is lowest at 8.47 hours/day in July; these figures can support broad outdoor-planning expectations, but do not guarantee daily sunshine or describe daylight duration.
Climate Data Overview for Rarotonga, Cook Islands
Explore the comprehensive climate data for Rarotonga, Cook Islands. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.
| Month | Average: Temperature °C | Rain (mm) / day | Snow (mm) / day | Sunshine (h) / day |
|---|---|---|---|---|
| Jan | 23.5 | 7.88 | 0.00 | 10.25 |
| Feb | 23.8 | 6.47 | 0.00 | 10.16 |
| Mar | 24.0 | 7.66 | 0.00 | 9.73 |
| Apr | 23.3 | 4.69 | 0.00 | 9.35 |
| May | 22.5 | 5.00 | 0.00 | 8.69 |
| Jun | 21.5 | 2.77 | 0.00 | 8.67 |
| Jul | 20.7 | 3.35 | 0.00 | 8.47 |
| Aug | 20.2 | 2.85 | 0.00 | 8.92 |
| Sep | 20.5 | 2.36 | 0.00 | 9.87 |
| Oct | 20.9 | 3.02 | 0.00 | 9.93 |
| Nov | 21.7 | 2.96 | 0.00 | 10.49 |
| Dec | 22.8 | 5.75 | 0.00 | 10.22 |
| Average | 22.1 | 4.56 | 0.00 | 9.56 |
