WEATHER · CLIMATE NORMALS · 1991–2020
Lima Climate — Averages by Month
What the weather in Lima, PEaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | 21.5 °C | 28.4 mm |
| February | 22.2 °C · warmest | 41.4 mm · wettest |
| March | 22.0 °C | 34.0 mm |
| April | 20.6 °C | 12.9 mm |
| May | 19.1 °C | 9.5 mm |
| June | 18.0 °C | 12.6 mm |
| July | 17.3 °C | 13.9 mm |
| August | 17.0 °C · coldest | 12.6 mm |
| September | 17.2 °C | 11.7 mm |
| October | 17.6 °C | 10.9 mm |
| November | 18.6 °C | 9.6 mm |
| December | 20.0 °C | 13.7 mm |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest Lima — centred at 12.00°S, 77.00°W. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.