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Weather in Grand Cayman for September 2025

Your guide to Grand Cayman weather in September - trends and predictions

    Temperatures

  • 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 °C by the end of September.

    • Rain 🌧️

  • Grand Cayman experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 409 mm.

Average dry days
2
Dry days
Average rainy days
28
Rainy days
Average snowy days
0
Snow days
Average temperatures
30°/28°
Temperatures
Average wind speed
24 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Grand Cayman Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Moderate or heavy rain shower
29°
2
Heavy rain at times
29°
3
Patchy rain possible
30°
4
Moderate or heavy rain shower
30°
5
Patchy rain possible
30°
6
Patchy rain possible
31°
7
Patchy rain possible
30°
8
Patchy rain possible
29°
9
Moderate rain at times
30°
10
Partly cloudy
31°
11
Patchy rain possible
30°
12
Moderate rain at times
30°
13
Patchy rain possible
30°
14
Moderate or heavy rain shower
30°
15
Moderate rain at times
30°
16
Patchy rain possible
30°
17
Patchy rain possible
32°
18
Patchy rain possible
30°
19
Heavy rain at times
31°
20
Heavy rain at times
30°
21
Overcast
30°
22
Moderate or heavy rain shower
29°
23
Moderate or heavy rain shower
28°
24
Moderate or heavy rain shower
28°
25
Moderate or heavy rain shower
28°
26
Moderate or heavy rain shower
28°
27
Moderate rain at times
30°
28
Moderate rain at times
29°
29
Moderate or heavy rain shower
29°
30
Partly cloudy
31°

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

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /27° 11.8 mm 6
2 Sept. Heavy rain at times
Heavy rain at times
 29° /28° 3.1 mm 6
3 Sept. Patchy rain possible
Patchy rain possible
 30° /27° 1.5 mm 7
4 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 30° /28° 7.5 mm 7
5 Sept. Patchy rain possible
Patchy rain possible
 30° /28° 6.9 mm 7
6 Sept. Patchy rain possible
Patchy rain possible
 31° /29° 0.3 mm 7
7 Sept. Patchy rain possible
Patchy rain possible
 30° /29° 1.5 mm 7
8 Sept. Patchy rain possible
Patchy rain possible
 29° /29° 1.4 mm 6
9 Sept. Moderate rain at times
Moderate rain at times
 30° /29° 1.9 mm 7
10 Sept. Partly cloudy
Partly cloudy
 31° /29° 0 mm 8
11 Sept. Patchy rain possible
Patchy rain possible
 30° /29° 1.6 mm 7
12 Sept. Moderate rain at times
Moderate rain at times
 30° /28° 2 mm 7
13 Sept. Patchy rain possible
Patchy rain possible
 30° /28° 1 mm 7
14 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 30° /29° 5.6 mm 7
15 Sept. Moderate rain at times
Moderate rain at times
 30° /29° 2.3 mm 7
16 Sept. Patchy rain possible
Patchy rain possible
 30° /29° 0.7 mm 7
17 Sept. Patchy rain possible
Patchy rain possible
 32° /29° 1.4 mm 7
18 Sept. Patchy rain possible
Patchy rain possible
 30° /29° 0.9 mm 7
19 Sept. Heavy rain at times
Heavy rain at times
 31° /29° 15.9 mm 7
20 Sept. Heavy rain at times
Heavy rain at times
 30° /27° 4.4 mm 7
21 Sept. Overcast
Overcast
 30° /29° 0.1 mm 7
22 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /27° 4.8 mm 6
23 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /27° 54.8 mm 6
24 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /26° 122.6 mm 6
25 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /27° 102.3 mm 6
26 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /28° 29.1 mm 6
27 Sept. Moderate rain at times
Moderate rain at times
 30° /28° 5.1 mm 7
28 Sept. Moderate rain at times
Moderate rain at times
 29° /28° 2.8 mm 6
29 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /27° 8.9 mm 6
30 Sept. Partly cloudy
Partly cloudy
 31° /28° 6.8 mm 8
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.
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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 409 mm is expected in Grand Cayman during September, occurring over more than 28 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 24 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 💧

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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Get accurate weather forecasts for Grand Cayman, located at latitude 19.323 and longitude -81.249. Stay updated with localized weather information tailored for Grand Cayman.

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