San Juan Weather in September
Puerto Rico · 30-year monthly averages
⚠️ Challenging time to visit
September in San Juan is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (78°F). Expect roughly 165mm of precipitation spread over about 15 rainy days, and this is one of the wetter months.
Avg high
32°C
89°F
Avg low
25°C
78°F
Rainfall
165mm
rainy
Rainy days
15
days with ≥1mm
🎒 What to pack
- breathable summer clothing
- sunscreen, hat and sunglasses
- refillable water bottle
- compact umbrella or rain jacket
September vs the rest of the year
FAQ
- How hot is San Juan in September?
- September in San Juan is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (78°F). Expect roughly 165mm of precipitation spread over about 15 rainy days, and this is one of the wetter months.
- Does it rain a lot in San Juan in September?
- San Juan sees around 165mm of precipitation in September on average — rainy by global standards.
- Is September a good time to visit San Juan?
- September is a challenging month to visit San Juan weather-wise — plan around the conditions.