San Juan Weather in September
Puerto Rico · September climate averages and travel tips
Avg high30°C (87°F)
Avg low27°C (80°F)
Rainfall157 mm (6.2 in)
RatingPoor 3.3/10
In September, San Juan has average highs of 30°C (87°F) and lows of 27°C (80°F). The month is wet, with about 157 mm (6.2 in) of rain spread over 26 days, making it the second wettest month of the year. Humidity averages 79%, so it feels sticky and hotter than the thermometer suggests. You get roughly 12.1 hours of daylight and frequently cloudy skies.
Is September a good time to visit San Juan?
September is not the best time to visit San Juan (3.3/10) mainly because of the rain. The weather is much better in January to March.
September weather at a glance
| Average high | 30°C (87°F) |
|---|---|
| Average low | 27°C (80°F) |
| Daily mean | 28°C (83°F) |
| Rainfall | 157 mm (6.2 in) |
| Rainy days (1 mm+) | 26 |
| Humidity | 79% |
| Cloud cover | 67% |
| Daylight | 12.1 hours |
| Est. sunshine | 4.4 hours/day |
| Wind | 11.9 km/h |
| vs August | About as warm as August, with 25 mm more rain. |
What to pack for San Juan in September
- light, breathable clothing
- sunscreen and a hat
- an umbrella or rain jacket
San Juan weather in other months
Jan28°C / 24°C43 mmExcellentFeb28°C / 23°C40 mmExcellentMar29°C / 24°C52 mmExcellentApr29°C / 24°C71 mmGoodMay30°C / 25°C124 mmPoorJun30°C / 26°C91 mmPoorJul30°C / 27°C102 mmPoorAug31°C / 27°C132 mmPoorSep30°C / 27°C157 mmPoorOct30°C / 26°C169 mmPoorNov29°C / 26°C142 mmPoorDec28°C / 24°C55 mmGood
← AugustBest time to visit San JuanOctober →
Better weather in September nearby
- San Francisco, California24°C · 4 mm · Excellent
- Seattle, Washington21°C · 62 mm · Excellent
- Denver, Colorado29°C · 35 mm · Excellent
- Calgary20°C · 49 mm · Excellent
- Edmonton19°C · 41 mm · Excellent
- Toronto22°C · 62 mm · Excellent
Nearby in September
- Charlotte Amalie29°C · 128 mm
- Road Town29°C · 85 mm
- Punta Cana29°C · 119 mm
- Marigot29°C · 83 mm
- The Valley29°C · 83 mm
- Philipsburg29°C · 83 mm
Where else is good in September? See where to go in September.