Temperature
Pleasant by day, mild at night.
71°Ftypical September high
Typical range
September climate
September in Rarotonga
Cook Islands · Oceania
Warm coastal days and some sun. Wind on exposed beaches is the main drawback.
One of the best months here
Early to mid
Daytime high
71°F
Lows around 69°F
Rain
Several rainy days
Sun
10 h/day
Air feel
Humid
Sea temp
75°F
Warm sea
Wind
16 mph
Windy
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days. About 9 wet days, the lowest monthly average.
30%wet-day frequency
AmountWet-day chance
Sunshine
A mix of sunshine and cloud.
9.8 hSeptember sunshine
Heat & humidity by month
Humidity is noticeable this month.
57%September Heat feel
Easy airWarm airHumid airVery humid air
Hourly temperature pattern
In September, days and nights feel about the same, around 69°.
ComfortableWarmNight hours
Clear sky
Mostly cloudy skies this month.
39%September Clear sky
Clear skyCloud
Steady wind
September's steady trade-wind breeze keeps the air from feeling as stagnant.
16 mphSeptember Windy
Sea temperature
75°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September stays around 73°F through the day and night.
Avg temp Typical range
Morning73°F
Rain18%
Cloud62%
Humid airModerate
Sun intensityModerate
Midday73°F
Rain16%
Cloud59%
Humid airModerate
Sun intensityStrong
Late afternoon73°F
Rain15%
Cloud59%
Humid airModerate
Sun intensityModerate
Best windowEarly evening73°F
Rain17%
Cloud60%
Humid airModerate
Sun intensityMinimal
Data tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 76 | 74 | 8.4 | 19 | 10.7 | 82 | 81 |
| Feb | 77 | 74 | 8.1 | 17 | 10.3 | 82 | 82 |
| Mar | 77 | 74 | 7.6 | 19 | 10.4 | 82 | 82 |
| Apr | 76 | 74 | 5.6 | 15 | 9.7 | 79 | 81 |
| May | 74 | 72 | 5.6 | 14 | 9.2 | 77 | 79 |
| Jun | 72 | 70 | 3.0 | 9 | 9.3 | 74 | 77 |
| Jul | 71 | 69 | 3.6 | 9 | 9.0 | 74 | 76 |
| Aug | 70 | 68 | 3.0 | 9 | 9.5 | 73 | 75 |
| Sep | 71 | 69 | 2.7 | 9 | 9.8 | 76 | 75 |
| Oct | 71 | 69 | 3.7 | 10 | 10.6 | 76 | 76 |
| Nov | 73 | 71 | 3.6 | 11 | 11.2 | 78 | 78 |
| Dec | 75 | 73 | 7.6 | 15 | 11.0 | 80 | 79 |
Similar climates
Similar
Similar travel stylePort DenarauFijiSimilar travel styleWhitsundaysAustraliaSimilar travel styleMooreaFrench PolynesiaSimilar travel styleVava'uTonga
Want a side-by-side climate view? Compare Rarotonga with Port Denarau.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology