Grand Cayman
September
Weather in Grand Cayman for September 2026
Your guide to Grand Cayman weather in September - trends and predictions
Until now, September 2026 in Grand Cayman has been nearly identical to the historical average, with a temperature of 29.8 °C (showing only a slight deviation of 0.3 °C).
The forecast for the next days in Grand Cayman predicts temperatures to be around 29 °C, close to the historical average.
In general, the average temperature in Grand Cayman at the beginning of September is 29.9 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 29.1 °C by the end of September.
Grand Cayman experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 266.7 mm.
Temperatures
Rain 🌧️
5
Dry days
25
Rainy days
0
Snow days
30°/28°
Temperatures
21 km/h
Avg max wind
77 %
Avg humidity
Grand Cayman Weather September
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Temperatures trend during September in Grand Cayman
See the weather trend as well as the moving average line
September weather in Grand Cayman day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Moderate or heavy rain shower | 30° /28° | 4.9 mm | 8 | |
| 2 Sept. |  Heavy rain at times | 29° /28° | 1.8 mm | 8 | |
| 3 Sept. |  Patchy rain possible | 30° /28° | 0.6 mm | 6 | |
| 4 Sept. | Moderate or heavy rain shower | 30° /28° | 2.7 mm | 6 | |
| 5 Sept. | Patchy rain possible | 30° /28° | 5.1 mm | 7 | |
| 6 Sept. | Patchy rain possible | 30° /28° | 5.5 mm | 7 | |
| 7 Sept. | Patchy rain possible | 30° /29° | 1.4 mm | 7 | |
| 8 Sept. | Patchy rain possible | 30° /29° | 3.5 mm | 8 | |
| 9 Sept. | Moderate rain at times | 31° /28° | 10.8 mm | 7 | |
| 10 Sept. |  Partly cloudy | 31° /28° | 3.7 mm | 7 | |
| 11 Sept. | Patchy rain possible | 31° /28° | 2 mm | 6 | |
| 12 Sept. | Moderate rain at times | 30° /28° | 0.8 mm | 8 | |
| 13 Sept. |  Overcast | 30° /28° | 0.3 mm | 8 | |
| 14 Sept. | Moderate or heavy rain shower | 31° /29° | 2.1 mm | 9 | |
| 15 Sept. | Moderate rain at times | 31° /28° | 1.2 mm | 8 | |
| 16 Sept. | Patchy rain possible | 30° /28° | 1.5 mm | 7 | |
| 17 Sept. | Patchy rain possible | 31° /28° | 1.4 mm | 8 | |
| 18 Sept. | Patchy rain possible | 31° /28° | 5.6 mm | 6 | |
| 19 Sept. | Heavy rain at times | 30° /28° | 9.1 mm | 5 | |
| 20 Sept. | Heavy rain at times | 29° /27° | 10 mm | 5 | |
| 21 Sept. | Overcast | 30° /27° | 13.9 mm | 5 | |
| 22 Sept. | Moderate or heavy rain shower | 29° /27° | 9.4 mm | 5 | |
| 23 Sept. | Moderate or heavy rain shower | 30° /27° | 20.5 mm | 5 | |
| 24 Sept. | Moderate or heavy rain shower | 30° /27° | 48 mm | 5 | |
| 25 Sept. | Moderate or heavy rain shower | 29° /27° | 34.8 mm | 5 | |
| 26 Sept. | Moderate or heavy rain shower | 29° /28° | 24.4 mm | 7 | |
| 27 Sept. |  Sunny | 29° /28° | 0 mm | 10 | |
| 28 Sept. | Overcast | 29° /29° | 1.5 mm | 9.1 | |
| 29 Sept. | Overcast | 29° /29° | 1.6 mm | 9.7 | |
| 30 Sept. | Light rain shower | 29° /27° | 17.3 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Grand Cayman 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 Grand Cayman forecast closer to your planned date for the most up-to-date weather information.
Change Month
Grand Cayman in September - FAQ
What are the expected maximum and minimum temperatures in Grand Cayman during September?
During September, expect a variety of temperatures with highs around 30° and lows near 28°, suitable for diverse activities and preferences.
How much rainfall should be expected in Grand Cayman during September?
Significant rainfall exceeding 266.7 mm is expected in Grand Cayman during September, occurring over more than 25 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Grand Cayman during September?
The average wind speed in Grand Cayman during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Grand Cayman
Explore the daily rainfall trends and prepare for Grand Caymans September weather 💧
Typically, Grand Cayman has 25 rainy days in September with a total of 266.7 mm of rainfall.
UV exposure in Grand Cayman during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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