Guatemala City weather by month
Guatemala City runs from about 17°C in December to 23°C in May, with June the wettest month at 486 mm.
warmest month
May
23°C
coolest month
December
17°C
wettest month
June
486 mm
worst air month
May
34 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 18°C | 8 mm | 338 h | 18 |
| February | 18°C | 18 mm | 328 h | 23 |
| March | 21°C | 6 mm | 361 h | 18 |
| April | 21°C | 53 mm | 350 h | 26 |
| May | 23°C | 28 mm | 361 h | 34 |
| June | 20°C | 486 mm | 233 h | 24 |
| July | 19°C | 182 mm | 338 h | 20 |
| August | 19°C | 144 mm | 350 h | 18 |
| September | 20°C | 226 mm | 310 h | 18 |
| October | 18°C | 137 mm | 325 h | 18 |
| November | 18°C | 75 mm | 291 h | 17 |
| December | 17°C | 23 mm | 307 h | 15 |
About 3,892 hours of sun a year. Roughly 121 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 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.