San Juan (Punta Caña)
September
Weather in San Juan for September 2027
Your guide to San Juan weather in September - trends and predictions
In general, the average temperature in San Juan at the beginning of September is 31.1 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 30.7 °C by the end of September.
San Juan in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 129.2 mm.
Is September a good time to visit San Juan? check out the best time to travel to San Juan page.
Temperatures
Rain 🌧️
More
11
Dry days
19
Rainy days
0
Snow days
31°/18°
Temperatures
15 km/h
Avg max wind
76 %
Avg humidity
San Juan Weather September
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Temperatures trend during September in San Juan
See the weather trend as well as the moving average line
September weather in San Juan day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain | 31° /19° | 4 mm | 7 | |
| 2 Sept. | Light rain | 31° /18° | 4.4 mm | 9 | |
| 3 Sept. | Light rain | 31° /18° | 5.2 mm | 8 | |
| 4 Sept. |  Light rain shower | 31° /19° | 2.3 mm | 9 | |
| 5 Sept. | Light rain shower | 31° /18° | 2.4 mm | 9 | |
| 6 Sept. | Light rain | 31° /19° | 8.8 mm | 8 | |
| 7 Sept. | Patchy rain possible | 31° /19° | 2 mm | 8 | |
| 8 Sept. | Light rain | 31° /17° | 4.2 mm | 7 | |
| 9 Sept. | Light rain | 32° /18° | 3 mm | 9 | |
| 10 Sept. | Light rain | 31° /18° | 7.1 mm | 8 | |
| 11 Sept. | Light rain | 32° /18° | 4.4 mm | 7 | |
| 12 Sept. | Light rain | 32° /18° | 3.2 mm | 7 | |
| 13 Sept. | Patchy rain possible | 32° /19° | 1.5 mm | 7 | |
| 14 Sept. | Light rain | 32° /18° | 4.1 mm | 8 | |
| 15 Sept. |  Moderate rain | 31° /17° | 11.9 mm | 8 | |
| 16 Sept. | Light rain | 31° /18° | 3.4 mm | 8 | |
| 17 Sept. | Light rain | 33° /20° | 6.1 mm | 8 | |
| 18 Sept. | Patchy rain possible | 31° /19° | 2.3 mm | 6 | |
| 19 Sept. | Patchy rain possible | 33° /19° | 2.3 mm | 7 | |
| 20 Sept. | Light rain | 31° /18° | 5.8 mm | 8 | |
| 21 Sept. | Light rain | 31° /19° | 3.7 mm | 6 | |
| 22 Sept. |  Heavy rain at times | 32° /18° | 9 mm | 6 | |
| 23 Sept. |  Thundery outbreaks possible | 31° /19° | 3.7 mm | 6 | |
| 24 Sept. | Patchy rain possible | 30° /20° | 1 mm | 8 | |
| 25 Sept. | Patchy rain possible | 33° /20° | 2.1 mm | 7 | |
| 26 Sept. | Light rain | 30° /19° | 3.7 mm | 7 | |
| 27 Sept. |  Moderate rain at times | 30° /20° | 9.8 mm | 7 | |
| 28 Sept. | Light rain | 29° /20° | 3.4 mm | 6 | |
| 29 Sept. | Light rain | 31° /19° | 3.9 mm | 7 | |
| 30 Sept. | Patchy rain possible | 32° /18° | 0.6 mm | 8 | |
| Next | |||||
Important Notice
Our weather forecast for San Juan 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 San Juan forecast closer to your planned date for the most up-to-date weather information.
Change Month
San Juan in September - FAQ
What are the expected maximum and minimum temperatures in San Juan during September?
Expect warm days with temperatures around 31°, cooling to mild conditions of 18° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in San Juan during September?
Significant rainfall exceeding 129.2 mm is expected in San Juan during September, occurring over more than 19 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in San Juan during September?
The average wind speed in San Juan during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
San Juan water temperatures in September
The average water temperature of the Caribbean Sea near San Juan in September is 29 °C. At the beginning of September temperatures are around 28.9 °C; by the end of the month they stay fairly steady and reach 29.1 °C.
- What is the water temperature in San Juan in September?
- The average water temperature in San Juan in September is 29 °C.
- Can you swim in San Juan in September?
- The sea feels almost bath-like – perfect for floating, paddle-boarding or spending hours snorkeling without a wetsuit.
September rainfall patterns in San Juan
Explore the daily rainfall trends and prepare for San Juans September weather 💧
Typically, San Juan has 19 rainy days in September with a total of 129.2 mm of rainfall.
UV exposure in San Juan during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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