Climate averages 1991–2020
Fiumicino weather
in September.
A warm, moderately wet month: the 4th warmest and the 9th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Fiumicino: daytime highs average 24.2°C and nights cool to about 18.9°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 86 mm of rain on roughly 8 days, which makes September a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 31 min on an average September day.
The nearest other city in this atlas is Acilia-Castel Fusano-Ostia Antica (8 km away). In September its highs average 24.4°C, about as warm as Fiumicino, with 86 mm of rain.
Among the 79 cities listed in Italy, Fiumicino ranks joint 42nd of 79 for the warmest September highs and joint 41st of 79 for the driest September (rainfall, lowest first). The mean September high of those 79 cities is 24.3°C; Fiumicino is 0.1°C cooler than that mean.
From September to October, average highs fall by 3.7°C to 20.5°C, and monthly rainfall rises from 86 mm to 131 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Fiumicino climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 12.0°C6.9°C | 6.9°C | 81 | 10.5 | 9.510 h |
| February | 12.4°C6.8°C | 6.8°C | 79 | 9.7 | 10.611 h |
| March | 14.4°C8.5°C | 8.5°C | 72 | 8.6 | 11.912 h |
| April | 16.7°C10.9°C | 10.9°C | 61 | 8.0 | 13.313 h |
| May | 20.6°C14.7°C | 14.7°C | 40 | 6.0 | 14.515 h |
| June | 24.6°C18.6°C | 18.6°C | 22 | 3.3 | 15.215 h |
| July | 27.4°C21.4°C | 21.4°C | 15 | 1.8 | 14.915 h |
| August | 27.9°C22.0°C | 22.0°C | 21 | 2.6 | 13.914 h |
| September, selected | 24.2°C18.9°C | 18.9°C | 86 | 7.8 | 12.513 h |
| October | 20.5°C15.6°C | 15.6°C | 131 | 10.4 | 11.111 h |
| November | 16.4°C11.8°C | 11.8°C | 161 | 13.3 | 9.910 h |
| December | 13.0°C8.3°C | 8.3°C | 115 | 11.7 | 9.29 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Acilia-Castel Fusano-Ostia Antica in SeptemberItaly · 8 kmHigh 24.4°C · Low 18.6°C · 86 mm rain
- Rome in SeptemberItaly · 26 kmHigh 25.3°C · Low 16.6°C · 84 mm rain
- Aprilia in SeptemberItaly · 40 kmHigh 24.4°C · Low 17.6°C · 91 mm rain
- Guidonia Montecelio in SeptemberItaly · 47 kmHigh 25.7°C · Low 15.3°C · 85 mm rain
- Latina in SeptemberItaly · 65 kmHigh 25.0°C · Low 17.6°C · 88 mm rain
- Terni in SeptemberItaly · 94 kmHigh 25.6°C · Low 15.0°C · 81 mm rain
- Perugia in SeptemberItaly · 150 kmHigh 22.6°C · Low 12.6°C · 79 mm rain
- Pescara in SeptemberItaly · 179 kmHigh 24.1°C · Low 16.6°C · 68 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Fiumicino) is explained once on the Fiumicino year overview and on the Sources, method and limits page.
Acilia-Castel Fusano-Ostia Antica lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.