Average temperatures within San Juan in January is 23. Through the month the highs are about 27 and low being 21 celsius. We have put some more information here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 23 |
| High Temperature | 27 |
| Low Temperature | 21 |
| Sunshine Per Day | 9 |
Useful Links: San Juan Weather: Average Weather & Yearly Climate