San Juan del Sur weather by month
San Juan del Sur runs from about 25°C in November to 29°C in April, with June the wettest month at 460 mm.
warmest month
April
29°C
coolest month
November
25°C
wettest month
June
460 mm
worst air month
May
9 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 27°C | 8 mm | 351 h | 5 |
| February | 27°C | 9 mm | 334 h | 7 |
| March | 29°C | 13 mm | 366 h | 6 |
| April | 29°C | 24 mm | 351 h | 7 |
| May | 29°C | 166 mm | 339 h | 9 |
| June | 26°C | 460 mm | 241 h | 6 |
| July | 26°C | 361 mm | 275 h | 6 |
| August | 26°C | 274 mm | 322 h | 5 |
| September | 26°C | 447 mm | 244 h | 4 |
| October | 26°C | 252 mm | 287 h | 4 |
| November | 25°C | 423 mm | 274 h | 4 |
| December | 26°C | 137 mm | 299 h | 4 |
About 3,683 hours of sun a year. Roughly 208 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-27. Full method, licences and the list of sources we rejected are on the methodology page.