Cairns weather by month
Cairns runs from about 21°C in July to 28°C in January, with January the wettest month at 652 mm.
warmest month
January
28°C
coolest month
July
21°C
wettest month
January
652 mm
worst air month
October
9 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 28°C | 652 mm | 281 h | 5 |
| February | 27°C | 254 mm | 278 h | 5 |
| March | 26°C | 466 mm | 274 h | 4 |
| April | 26°C | 131 mm | 297 h | 4 |
| May | 24°C | 104 mm | 298 h | 4 |
| June | 22°C | 19 mm | 300 h | 5 |
| July | 21°C | 74 mm | 303 h | 5 |
| August | 22°C | 50 mm | 317 h | 6 |
| September | 23°C | 62 mm | 313 h | 6 |
| October | 25°C | 27 mm | 361 h | 9 |
| November | 26°C | 50 mm | 355 h | 8 |
| December | 27°C | 405 mm | 327 h | 5 |
About 3,704 hours of sun a year. Roughly 166 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.