Weather Comparison
Santo Domingo vs San Juan
Side-by-side weather comparison for September
September Weather: Santo Domingo vs San Juan
| Metric | Santo Domingo | San Juan | Better |
|---|---|---|---|
| Average HighHigher is warmer | 30°C (86°F) | 31°C (88°F)▲ | San Juan |
| Average LowHigher is milder | 23°C (73°F) | 25°C (77°F)▲ | San Juan |
| Rain DaysFewer is drier | 21 days | 21 days | Tie |
| PrecipitationLess is drier | 127 mm▲ | 128 mm | Santo Domingo |
| Sunshine HoursMore is sunnier | 10h/day | 11h/day▲ | San Juan |
| HumidityLower is more comfortable | 78% | 78% | Tie |
| UV IndexLower is safer | 6 | 6 | Tie |
| Wind SpeedCalmer is better | 12 km/h▲ | 18 km/h | Santo Domingo |
Which City is Better in September?
Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, San Juan edges ahead as the better destination in September. San Juan offers 11 hours of daily sunshine with only 21 rain days, while Santo Domingo sees 10 sunshine hours and 21 rain days.
Santo Domingo can feel quite hot at 30°C, so plan for heat. San Juan runs hot at 31°C.
For travelers who prioritize dry weather, both cities are equally dry in September. San Juan receives 1 more hour of sunshine per day, which matters for sightseeing and outdoor activities.
Temperature Comparison in September
Santo Domingo reaches an average high of 30°C (86°F) and drops to 23°C (73°F) at night during September. The daily temperature range is 7°C, meaning relatively stable temperatures from day to night.
San Juan averages 31°C (88°F) for the high and 25°C (77°F) for the low, with a daily range of 6°C. The two cities feel quite similar in terms of temperature.
Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in September.
Rainfall Comparison in September
Santo Domingo receives approximately 127 mm of rainfall across 21 rain days during September. Rain is frequent, so waterproof gear is essential.
San Juan sees 128 mm over 21 rain days. Both cities are equally rainy this month.
Both cities share similar humidity levels at 78%.
What to Pack: Santo Domingo vs San Juan
Packing for Santo Domingo in September
Highs of 30°C, lows of 23°C, 21 rain days
- ✓lightweight breathable clothing
- ✓sunscreen SPF 50+
- ✓sunglasses
- ✓a wide-brimmed hat
- ✓waterproof jacket
- ✓compact umbrella
- ✓waterproof shoes
- ✓moisture-wicking fabrics
Packing for San Juan in September
Highs of 31°C, lows of 25°C, 21 rain days
- ✓lightweight breathable clothing
- ✓sunscreen SPF 50+
- ✓sunglasses
- ✓a wide-brimmed hat
- ✓waterproof jacket
- ✓compact umbrella
- ✓waterproof shoes
- ✓moisture-wicking fabrics
Pack for both: lightweight breathable clothing, sunscreen SPF 50+, sunglasses, a wide-brimmed hat, waterproof jacket, compact umbrella, waterproof shoes, moisture-wicking fabrics. These items are useful in either destination during September.
Year-Round Comparison: Santo Domingo vs San Juan
The table below shows average high temperatures and rain days for every month of the year, helping you find the best time to visit either city.September is highlighted for quick reference.
| Month | Santo Domingo | San Juan | ||
|---|---|---|---|---|
| High | Rain | High | Rain | |
| Jan | 27°C | 12d | 28°C | 11d |
| Feb | 28°C | 11d | 29°C | 9d |
| Mar | 28°C | 12d | 29°C | 9d |
| Apr | 29°C | 16d | 30°C | 12d |
| May | 29°C | 21d | 30°C | 17d |
| Jun | 30°C | 22d | 31°C | 14d |
| Jul | 30°C | 22d | 31°C | 17d |
| Aug | 30°C | 22d | 31°C | 19d |
| Sep | 30°C | 21d | 31°C | 21d |
| Oct | 29°C | 22d | 30°C | 21d |
| Nov | 28°C | 16d | 29°C | 19d |
| Dec | 28°C | 12d | 28°C | 13d |
Santo Domingo Weather in September
Full forecast, packing tips, and activities
San Juan Weather in September
Full forecast, packing tips, and activities