Cook Islands

Cook Islands Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in the Cook Islands in September.

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Rarotonga Arutanga Arorangi Rakahanga

Planning a getaway to the Cook Islands this September and curious about the weather you should prepare for? Discover all the vital details you need on this page, solving your puzzle:

What to Expect in the Cook Islands in September

September in the Cook Islands generally has warm temperatures, with precipitation levels ranging from moderate to high.

Temperatures

The average maximum temperatures are warm and range from 25°C (77°F) in Rarotonga to 29°C (84°F) in Penrhyn. Nighttime temperatures generally drop to 26°C (79°F) in Penrhyn and 22°C (72°F) in Rarotonga.

For a closer look at conditions across the Cook Islands, refer to the map below.

Precipitation

In September, precipitation varies across different areas. From moderate rainfall in Arutanga with an average of 79 mm (3.1 in) to high rainfall in Pukapuka with 142 mm (5.6 in).

Average sunshine

Sunshine amounts are decent in most places. Rarotonga gets approximately 182 hours of sunlight in September, offering a reasonable amount of both bright and cloudy periods. Curious about sunnier destinations? Our weather planner makes it easy to find places worldwide with pleasant weather.

Explore the Cook Islands by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Best Places to Visit in the Cook Islands in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across the Cook Islands.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in the Cook Islands

What is the weather like in September for some of the most popular destinations in the Cook Islands?

Temperature range in the Cook Islands (September)

Precipitation variation in the Cook Islands (September)

Rarotonga

In September Rarotonga generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 22°C (72°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
25°C (77°F)
25°C (77°F)
25°C (77°F)
Min temperature
22°C (72°F)
22°C (72°F)
23°C (73°F)
Monthly sun hours
191 hours
182 hours
183 hours
Monthly rainfall
80 mm (3.1 in)
81 mm (3.2 in)
98 mm (3.9 in)
Monthly rainy days
14 days
11 days
9 days
Weather conditions
perfect
perfect
perfect
Climate in Rarotonga →

Arutanga

In September Arutanga generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 24°C (75°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
26°C (79°F)
26°C (79°F)
27°C (81°F)
Min temperature
24°C (75°F)
24°C (75°F)
24°C (75°F)
Monthly sun hours
187 hours
189 hours
184 hours
Monthly rainfall
71 mm (2.8 in)
79 mm (3.1 in)
105 mm (4.1 in)
Monthly rainy days
15 days
12 days
10 days
Weather conditions
perfect
perfect
pleasant
Climate in Arutanga →

Arorangi

In September Arorangi generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 22°C (72°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
25°C (77°F)
25°C (77°F)
25°C (77°F)
Min temperature
22°C (72°F)
22°C (72°F)
23°C (73°F)
Monthly sun hours
191 hours
182 hours
183 hours
Monthly rainfall
80 mm (3.1 in)
81 mm (3.2 in)
98 mm (3.9 in)
Monthly rainy days
14 days
11 days
9 days
Weather conditions
perfect
perfect
perfect
Climate in Arorangi →

Avarua

In September Avarua generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 22°C (72°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
25°C (77°F)
25°C (77°F)
25°C (77°F)
Min temperature
22°C (72°F)
22°C (72°F)
23°C (73°F)
Monthly sun hours
191 hours
182 hours
183 hours
Monthly rainfall
80 mm (3.1 in)
81 mm (3.2 in)
98 mm (3.9 in)
Monthly rainy days
14 days
11 days
9 days
Weather conditions
perfect
perfect
perfect
Climate in Avarua →

Ngatangiia

In September Ngatangiia generally has high temperatures with maximum daytime temperatures around 25°C (77°F), minimum nighttime temperatures around 22°C (72°F) and moderate monthly rainfall. So on average the conditions are perfect that month.

« August
September
October »
August
September
October
Max temperature
25°C (77°F)
25°C (77°F)
25°C (77°F)
Min temperature
22°C (72°F)
22°C (72°F)
23°C (73°F)
Monthly sun hours
191 hours
182 hours
183 hours
Monthly rainfall
80 mm (3.1 in)
81 mm (3.2 in)
98 mm (3.9 in)
Monthly rainy days
14 days
11 days
9 days
Weather conditions
perfect
perfect
perfect
Climate in Ngatangiia →

Is your destination not in the list? Have a look at all destinations in the Cook Islands.

Popular cities in September

Day & night temperatures, rainfall and average weather in the Cook Islands in September.

City Weather Day temp Night temp Rainfall
Rarotonga 25°C (77°F) 22°C (72°F) 81 mm (3.2 in)
Arutanga 26°C (79°F) 24°C (75°F) 79 mm (3.1 in)
Arorangi 25°C (77°F) 22°C (72°F) 81 mm (3.2 in)
Rakahanga 29°C (84°F) 26°C (79°F) 119 mm (4.7 in)
Pukapuka 29°C (84°F) 26°C (79°F) 142 mm (5.6 in)
Penrhyn 29°C (84°F) 26°C (79°F) 92 mm (3.6 in)

The Cook Islands weather in September: frequently asked questions

What is the weather like in the Cook Islands in September?

Expect perfect weather across the Cook Islands in September. The popular destination of Rarotonga averages 25°C (77°F) by day and 22°C (72°F) at night during this month.

What is the average temperature in the Cook Islands in September?

In Rarotonga, the average daytime high in September is 25°C (77°F), while nighttime temperatures drop to around 22°C (72°F).

Does the Cook Islands get a lot of rain in September?

Rain is generally moderate to light in the Cook Islands during September, with Rarotonga averaging close to 81 mm (3.2 in).

Is September a Good Time to Visit the Cook Islands?

We believe that September is one of the best times to visit the Cook Islands with overall perfect weather in Rarotonga.

On average, the best time to visit the Cook Islands is in June, August, September and October with generally perfect weather in Rarotonga. On the other hand, the weather in January, February and December tend to be unpleasant.

Interested in more climate information?

We have much more information about the climate in the Cook Islands.

Weather and climate has detailed information for every country in the world. Are you going to the Cook Islands? Get detailed historical weather averages for many cities in the Cook Islands.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.

The perfect escape to get away from it all

Still relatively untouched the Cook Islands are what paradise looks like in your wildest dreams. Expect tropical and green landscapes, mesmerizing turquoise waters and powder soft white sand.
Must visit in the Cook Islands →