Month guide · San Juan · Puerto Rico
San Juan in September
What September is really like in San Juan: weather, crowds, prices, events and what to pack.
Updated By the AMZBooking editorial team
Photo: Mattnbaker, CC BY-SA 4.0
Quick answer
September is a month many travellers avoid. Expect average highs of 31°C (88°F), lows of 25°C (77°F), about 14 rainy days and roughly 12.2 hours of daylight. Peak hurricane season and the quietest month; low prices but genuine storm risk.
Key facts
- Average high / low
- 31°C (88°F) / 25°C (77°F)
- Rainy days
- About 14
- Daylight
- About 12.2 hours
- Sea temperature
- 29°C (84°F)
- Crowds
- Very quiet
- Hotel prices
- Lowest
Weather in September
September is the 4th-warmest month in San Juan: days average 31°C (88°F) against a yearly average high of 30°C (86°F), and nights fall to about 25°C (77°F). Rain falls on roughly 14 of its 30 days. Compared with August (31°C (88°F)), September is about as warm; by October highs stay near 31°C (88°F).
- Sunrise (15 September)
- About 06:12
- Sunset (15 September)
- About 18:27
- Daylight
- About 12.2 hours
- Sea
- 29°C (84°F)
Summer (June–August). Hot and humid with short downpours and warm sea; island families on holiday and hurricane season under way.
Crowds and prices
On a 1–5 scale, September rates 1 for crowds (the peak is January at 5) and 1 for hotel prices (highest in January). That makes September one of the better-value months to book.
Events in September
September has no major recurring festival in San Juan, which usually means easier bookings.
What to do in September
With frequent rain, plan around indoor sights and keep outdoor time flexible.
Historic site · Old San Juan
Santa María Magdalena de Pazzis Cemetery
The view from El Morro's walls is the classic photo; if you walk down, go in daylight and be respectful.
- Time needed
- 30–45 minutes
- Cost
- Free
- Free
- History
- Photo spot
- Views
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Architecture · Puerta de Tierra
Capitol of Puerto Rico
The white marble Capitolio, completed in 1929, houses Puerto Rico's legislature beneath a mosaic-lined dome.
- Time needed
- 45 minutes
- Cost
- Free
- Free
- Architecture
- History
Street · Santurce
Santurce murals and Calle Cerra
Walk it in the morning when it is cooler, and stay on the main streets with other people around.
- Time needed
- 1–2 hours
- Cost
- Free
- Free
- Art
- Photo spot
- Off the beaten path
Nature · Condado
Condado Lagoon
A sheltered, calm lagoon between Condado and Miramar where visitors rent kayaks and paddleboards, and manatees and rays are sometimes spotted.
- Time needed
- 1–2 hours
- Cost
- Mid-priced
- Active
- Nature
- Kids
- Outdoors
The sea averages 29°C (84°F) — warm enough to swim. Best beaches near San Juan.
What to pack
For highs near 31°C, lows near 25°C and 14 wet days: light, breathable clothes, a sun hat and high-factor sunscreen; a compact umbrella and waterproof shoes — rain is frequent; comfortable walking shoes.
Is September a good time to visit San Juan?
A month many travellers avoid. If your dates are flexible, December–April are better overall. Compare every month.
San Juan in other months
Questions travellers ask
+Is September a good time to visit San Juan?
It is a month many travellers avoid. Peak hurricane season and the quietest month; low prices but genuine storm risk.
+How warm is San Juan in September?
Average highs are around 31°C (88°F) and lows around 25°C (77°F).
+Does it rain a lot in San Juan in September?
Expect rain on about 14 days of the month, so pack for wet weather.