The weather in September in Cook Islands
It's warm in September in Cook Islands with an average temperature of 26°C. Temperatures this month range from a low of 26°C to a high of 27°C. At night, you can expect temperatures between 20°C and 22°C.
Looking for sun? September isn’t a good month to be in Cook Islands. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Cook Islands. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 31°C in 2016, Cook Islands reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 22°C in 2023. The extreme nighttime temperatures ranged from a lowest recorded value of 14°C to a highest value of 25°C.
Rainfall amount
In September, there is an average of 104 mm of precipitation, spread over 13 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
Daily weather in September for Cook Islands
Click on any day in September to get detailed info about the usual weather on that day in Cook Islands. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Cook Islands | New York | |
|---|---|---|
| Average temperature | 26°C | 27°C |
| Max. temperature | 27°C | 31°C |
| Min. temperature | 20°C | -5°C |
| Total precipitation | 104 mm | 57 mm |
| Rainy days | 13 days | 9 days |
Start of September
The month of September starts in Cook Islands with hot temps, averaging around 27°C during the day and nights around 22°C.
Mid September
By mid-September, daytime temps stay steady at around 27°C, with nights around 22°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of September
By the end of September, the average daytime temperature in Cook Islands is around 27°C, while nighttime temps are about 22°C. A shower might pop up, but overall, the weather will be dry and sunny.
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UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Cook Islands for all months and discover the best travel time
The climate in Cook Islands is based on weather data from Avarua. Other spots might have different weather. You can check out all destinations in Cook Islands to get the full picture of the climate.
Temperature charts
These charts show the average temperatures in September in Cook Islands. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Cook Islands
Temperature in September in Cook Islands over the years
Precipitation charts
These charts show the average amount of precipitation in September in Cook Islands. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Cook Islands
Total precipitation in September in Cook Islands over the years
Daily UV index in September in Cook Islands
This chart shows the average daily UV index in September in Cook Islands, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Cook Islands
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Average weather in Cook Islands by month
Click on a month below to see detailed weather info for Cook Islands. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.