Measured, not vibes
Best Time to Visit San Juan
By measured weather comfort, the top months for San Juan are February, December, January — and RouteVerdict's editorial pick, which also weighs crowds and prices, is January, February, March, April, December. The table below is computed from ERA5 reanalysis data for 2020–2024, measured at San Juan (33 m elevation).
Month by month
San Juan weather and comfort, 2020–2024
| Month | Avg high | Wet days | Comfort | Season |
|---|---|---|---|---|
| January | 23.5°C / 74°F | 5.3 | 89 | Best |
| February | 23.9°C / 75°F | 4.2 | 91 | Best |
| March | 29°C / 84°F | 3.3 | 75 | |
| April | 31.4°C / 89°F | 6.7 | 56 | |
| May | 33.4°C / 92°F | 8.5 | 43 | |
| June | 35.2°C / 95°F | 7.8 | 34 | |
| July | 35.5°C / 96°F | 7.2 | 33 | |
| August | 36°C / 97°F | 7.3 | 30 | |
| September | 33.9°C / 93°F | 9 | 39 | |
| October | 31.5°C / 89°F | 6.3 | 56 | Shoulder |
| November | 26.7°C / 80°F | 5.8 | 81 | Shoulder |
| December | 24.8°C / 77°F | 3.7 | 91 | Best |
Comfort is RouteVerdict's 0–100 score: 100·exp(−(high−23)²/162) × (1 − min(0.35, wet days × 0.02)). The full method is on the methodology page. Weather data by Open-Meteo.com (ERA5, CC BY 4.0), 2020–2024 normals. Wet day = ≥1 mm precipitation.
FAQ
San Juan timing questions
What is the best month to visit San Juan?
By measured weather comfort (ERA5 2020–2024), the top months are February, December, and January, with February scoring highest. RouteVerdict's editorial pick is January, February, March, April, and December, which also weighs crowds, prices, and events.
What is the hottest month in San Juan?
August, with an average daily high of 36°C (97°F).
What is the rainiest month in San Juan?
September, averaging 9 days with at least 1 mm of precipitation.
When is shoulder season in San Juan?
November and October — the best-scoring months outside both the measured top three and RouteVerdict's editorial peak-season pick.