WEATHER · CLIMATE NORMALS · 1991–2020
Rome Climate — Averages by Month
What the weather in Rome, ITaverages 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 | 7.2 °C · coldest | 67.7 mm |
| February | 7.9 °C | 75.5 mm |
| March | 10.7 °C | 78.4 mm |
| April | 13.6 °C | 81.2 mm |
| May | 18.0 °C | 61.0 mm |
| June | 22.4 °C | 36.7 mm |
| July | 25.2 °C | 24.4 mm |
| August | 25.4 °C · warmest | 24.1 mm |
| September | 21.0 °C | 87.9 mm |
| October | 16.8 °C | 120.9 mm |
| November | 12.0 °C | 132.4 mm · wettest |
| December | 8.1 °C | 98.3 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 Rome — centred at 42.00°N, 12.50°E. 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.