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Weather in Cook Islands for September 2025

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

    Temperatures

  • In general, the average temperature in Cook Islands at the beginning of September is 22.6 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 22.7 °C by the end of September.

  • Rain 🌧️

  • Cook Islands in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 134.5 mm.

Average dry days
14
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/22°
Temperatures
Average wind speed
32 km/h
Avg max wind
Average humidity
74 %
Avg humidity

Cook Islands in September average weather

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Temperatures trend during September in Cook Islands

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
22° /21° 2.8 mm 6
2 Sept. Light rain shower
Light rain shower
22° /20° 69.6 mm 6
3 Sept. Cloudy
Cloudy
22° /21° 3.2 mm 6
4 Sept. Light rain shower
Light rain shower
23° /22° 3.1 mm 6
5 Sept. Light rain shower
Light rain shower
23° /21° 1.3 mm 6
6 Sept. Light rain shower
Light rain shower
23° /22° 7.4 mm 6
7 Sept. Light rain shower
Light rain shower
23° /22° 12.7 mm 6
8 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
23° /22° 10.3 mm 6
9 Sept. Light rain shower
Light rain shower
23° /22° 2.9 mm 6
10 Sept. Light rain shower
Light rain shower
23° /22° 3.6 mm 6
11 Sept. Cloudy
Cloudy
22° /21° 0.6 mm 6
12 Sept. Cloudy
Cloudy
23° /21° 0.3 mm 6
13 Sept. Cloudy
Cloudy
23° /21° 0.1 mm 6
14 Sept. Cloudy
Cloudy
23° /22° 0.5 mm 6
15 Sept. Cloudy
Cloudy
23° /22° 0.3 mm 6
16 Sept. Patchy rain possible
Patchy rain possible
23° /22° 0.7 mm 6
17 Sept. Patchy rain possible
Patchy rain possible
23° /22° 1.6 mm 6
18 Sept. Partly cloudy
Partly cloudy
23° /21° 2.5 mm 6
19 Sept. Patchy rain possible
Patchy rain possible
23° /21° 1.3 mm 6
20 Sept. Patchy rain possible
Patchy rain possible
22° /20° 2.3 mm 6
21 Sept. Light rain shower
Light rain shower
22° /21° 0.8 mm 6
22 Sept. Patchy rain possible
Patchy rain possible
21° /20° 0.2 mm 6
23 Sept. Patchy rain possible
Patchy rain possible
22° /21° 0 mm 6
24 Sept. Patchy rain possible
Patchy rain possible
22° /21° 2.5 mm 6
25 Sept. Light rain shower
Light rain shower
23° /21° 0.6 mm 6
26 Sept. Patchy rain possible
Patchy rain possible
22° /21° 0.3 mm 6
27 Sept. Patchy rain possible
Patchy rain possible
23° /22° 0.4 mm 6
28 Sept. Light rain shower
Light rain shower
23° /22° 1.7 mm 6
29 Sept. Patchy rain possible
Patchy rain possible
23° /22° 0.3 mm 6
30 Sept. Patchy rain possible
Patchy rain possible
23° /22° 0.4 mm 6
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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.

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 22°, suitable for diverse activities and preferences.
How much rainfall should be expected in Cook Islands during September?
Significant rainfall exceeding 134.5 mm is expected in Cook Islands during September, occurring over more than 16 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 💧

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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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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