Weather Comparison
San Juan vs Santo Domingo
Side-by-side weather comparison for September
September Weather: San Juan vs Santo Domingo
| Metric | San Juan | Santo Domingo | Better |
|---|---|---|---|
| Average HighHigher is warmer | 31°C (88°F)▲ | 30°C (86°F) | San Juan |
| Average LowHigher is milder | 25°C (77°F)▲ | 23°C (73°F) | San Juan |
| Rain DaysFewer is drier | 21 days | 21 days | Tie |
| PrecipitationLess is drier | 128 mm | 127 mm▲ | Santo Domingo |
| Sunshine HoursMore is sunnier | 11h/day▲ | 10h/day | San Juan |
| HumidityLower is more comfortable | 78% | 78% | Tie |
| UV IndexLower is safer | 6 | 6 | Tie |
| Wind SpeedCalmer is better | 18 km/h | 12 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.
San Juan can feel quite hot at 31°C, so plan for heat. Santo Domingo runs hot at 30°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
San Juan reaches an average high of 31°C (88°F) and drops to 25°C (77°F) at night during September. The daily temperature range is 6°C, meaning relatively stable temperatures from day to night.
Santo Domingo averages 30°C (86°F) for the high and 23°C (73°F) for the low, with a daily range of 7°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
San Juan receives approximately 128 mm of rainfall across 21 rain days during September. Rain is frequent, so waterproof gear is essential.
Santo Domingo sees 127 mm over 21 rain days. Both cities are equally rainy this month.
Both cities share similar humidity levels at 78%.
What to Pack: San Juan vs Santo Domingo
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
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
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: San Juan vs Santo Domingo
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 | San Juan | Santo Domingo | ||
|---|---|---|---|---|
| High | Rain | High | Rain | |
| Jan | 28°C | 11d | 27°C | 12d |
| Feb | 29°C | 9d | 28°C | 11d |
| Mar | 29°C | 9d | 28°C | 12d |
| Apr | 30°C | 12d | 29°C | 16d |
| May | 30°C | 17d | 29°C | 21d |
| Jun | 31°C | 14d | 30°C | 22d |
| Jul | 31°C | 17d | 30°C | 22d |
| Aug | 31°C | 19d | 30°C | 22d |
| Sep | 31°C | 21d | 30°C | 21d |
| Oct | 30°C | 21d | 29°C | 22d |
| Nov | 29°C | 19d | 28°C | 16d |
| Dec | 28°C | 13d | 28°C | 12d |
San Juan Weather in September
Full forecast, packing tips, and activities
Santo Domingo Weather in September
Full forecast, packing tips, and activities