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Weather in Cook Islands for September 2026

Your guide to Cook Islands weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Cook Islands is slightly cooler than the historical average by 0.7 °C.

  • The forecast for the next days in Cook Islands predicts temperatures to be around 22 °C, close to the historical average.

  • In general, the average temperature in Cook Islands at the beginning of September is 22.6 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 21.7 °C by the end of September.

    • Rain 🌧️

  • The climate of Cook Islands in September is notably wet, with an average of 12 rainy days, and a total of 134.6 mm of precipitation.

Average dry days
18
Dry days
Average rainy days
12
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/21°
Temperatures
Average wind speed
32 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Cook Islands Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Light rain shower
23°
2
Patchy rain possible
22°
3
Cloudy
22°
4
Patchy rain possible
22°
5
Patchy rain possible
23°
6
Light rain shower
23°
7
Light rain shower
23°
8
Patchy rain possible
23°
9
Patchy rain possible
23°
10
Light rain shower
23°
11
Patchy rain possible
23°
12
Patchy rain possible
23°
13
Cloudy
23°
14
Patchy rain possible
23°
15
Patchy rain possible
22°
16
Patchy rain possible
22°
17
Patchy rain possible
23°
18
Partly cloudy
23°
19
Patchy rain possible
23°
20
Patchy rain possible
22°
21
Light rain shower
23°
22
Overcast
21°
23
Patchy rain possible
22°
24
Patchy rain possible
22°
25
Light rain shower
22°
26
Patchy rain possible
22°
27
Sunny
21°
28
Patchy rain possible
21°
29
Patchy rain possible
22°
30
Light rain shower
22°

Temperatures trend during September in Cook Islands

See the weather trend as well as the moving average line

September weather in Cook Islands day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 23° /21° 1.6 mm 6
2 Sept. Patchy rain possible
Patchy rain possible
 22° /20° 35.1 mm 5
3 Sept. Cloudy
Cloudy
 22° /21° 2.4 mm 5
4 Sept. Patchy rain possible
Patchy rain possible
 22° /21° 2.1 mm 5
5 Sept. Patchy rain possible
Patchy rain possible
 23° /20° 3.8 mm 5
6 Sept. Light rain shower
Light rain shower
 23° /21° 4 mm 6
7 Sept. Light rain shower
Light rain shower
 23° /21° 6.6 mm 5
8 Sept. Patchy rain possible
Patchy rain possible
 23° /22° 5.4 mm 6
9 Sept. Patchy rain possible
Patchy rain possible
 23° /22° 1.5 mm 6
10 Sept. Light rain shower
Light rain shower
 23° /22° 1.9 mm 6
11 Sept. Patchy rain possible
Patchy rain possible
 23° /21° 0.8 mm 6
12 Sept. Patchy rain possible
Patchy rain possible
 23° /21° 0.6 mm 5
13 Sept. Cloudy
Cloudy
 23° /21° 0.7 mm 5
14 Sept. Patchy rain possible
Patchy rain possible
 23° /21° 0.4 mm 6
15 Sept. Patchy rain possible
Patchy rain possible
 22° /21° 0.2 mm 5
16 Sept. Patchy rain possible
Patchy rain possible
 22° /20° 8.3 mm 5
17 Sept. Patchy rain possible
Patchy rain possible
 23° /20° 5.5 mm 5
18 Sept. Partly cloudy
Partly cloudy
 23° /20° 28 mm 6
19 Sept. Patchy rain possible
Patchy rain possible
 23° /21° 1.2 mm 6
20 Sept. Patchy rain possible
Patchy rain possible
 22° /21° 1.1 mm 6
21 Sept. Light rain shower
Light rain shower
 23° /21° 0.5 mm 5
22 Sept. Overcast
Overcast
 21° /20° 0.2 mm 6
23 Sept. Patchy rain possible
Patchy rain possible
 22° /20° 0 mm 7
24 Sept. Patchy rain possible
Patchy rain possible
 22° /20° 1.2 mm 6
25 Sept. Light rain shower
Light rain shower
 22° /20° 0.4 mm 6
26 Sept. Patchy rain possible
Patchy rain possible
 22° /20° 1 mm 5
27 Sept. Sunny
Sunny
 21° /20° 0.1 mm 12.2
28 Sept. Patchy rain possible
Patchy rain possible
 21° /20° 0.9 mm 9
29 Sept. Patchy rain possible
Patchy rain possible
 22° /21° 0.8 mm 13.1
30 Sept. Light rain shower
Light rain shower
 22° /21° 4.8 mm 8.3
Next
Important Notice
Our weather forecast for Cook Islands in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cook Islands forecast closer to your planned date for the most up-to-date weather information.
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Cook Islands in September - FAQ

What are the expected maximum and minimum temperatures in Cook Islands during September?
During September, expect a variety of temperatures with highs around 22° and lows near 21°, suitable for diverse activities and preferences.

How much rainfall should be expected in Cook Islands during September?
Significant rainfall exceeding 134.6 mm is expected in Cook Islands during September, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Cook Islands during September?
The average wind speed in Cook Islands during September is 32 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Cook Islands

Explore the daily rainfall trends and prepare for Cook Islandss September weather 💧
Typically, Cook Islands has 12 rainy days in September with a total of 134.6 mm of rainfall.

UV exposure in Cook Islands during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Avarua
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Location coordinates Where is Cook Islands?

Get accurate weather forecasts for Cook Islands, located at latitude -21.208 and longitude -159.775. Stay updated with localized weather information tailored for Cook Islands.

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