Climate averages 1991–2020
Guidonia Montecelio weather
in August.
A hot, fairly dry month: the warmest and one of the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Guidonia Montecelio: daytime highs average 31.5°C and nights cool to about 19.0°C. By daytime temperature it is the warmest month of the year.
Expect about 28 mm of rain on roughly 6 days, which makes August a fairly dry month (one of the driest months of the year). Daylight, from sunrise to sunset, lasts about 13 h 52 min on an average August day.
The nearest other city in this atlas is Rome (21 km away). In August its highs average 30.4°C, 1.1°C cooler than Guidonia Montecelio, with 22 mm of rain.
Among the 79 cities listed in Italy, Guidonia Montecelio ranks joint 5th of 79 for the warmest August highs and joint 30th of 79 for the driest August (rainfall, lowest first). The mean August high of those 79 cities is 29.1°C; Guidonia Montecelio is 2.4°C warmer than that mean.
From August to September, average highs fall by 5.8°C to 25.7°C, and monthly rainfall rises from 28 mm to 85 mm.
The annual picture
August 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
Guidonia Montecelio climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 11.1°C2.0°C | 2.0°C | 69 | 8.5 | 9.59 h |
| February | 12.1°C2.1°C | 2.1°C | 77 | 9.4 | 10.611 h |
| March | 15.2°C4.5°C | 4.5°C | 84 | 9.9 | 11.912 h |
| April | 18.4°C7.4°C | 7.4°C | 94 | 12.2 | 13.313 h |
| May | 22.9°C11.5°C | 11.5°C | 77 | 10.3 | 14.515 h |
| June | 27.7°C15.5°C | 15.5°C | 46 | 7.3 | 15.215 h |
| July | 31.1°C18.4°C | 18.4°C | 28 | 4.8 | 14.915 h |
| August, selected | 31.5°C19.0°C | 19.0°C | 28 | 5.5 | 13.914 h |
| September | 25.7°C15.3°C | 15.3°C | 85 | 9.4 | 12.513 h |
| October | 20.9°C11.6°C | 11.6°C | 113 | 10.4 | 11.111 h |
| November | 15.8°C7.4°C | 7.4°C | 132 | 12.4 | 9.910 h |
| December | 11.9°C3.3°C | 3.3°C | 104 | 10.3 | 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
August in nearby cities
- Rome in AugustItaly · 21 kmHigh 30.4°C · Low 20.0°C · 22 mm rain
- Acilia-Castel Fusano-Ostia Antica in AugustItaly · 41 kmHigh 28.3°C · Low 21.8°C · 21 mm rain
- Aprilia in AugustItaly · 45 kmHigh 28.8°C · Low 20.9°C · 22 mm rain
- Fiumicino in AugustItaly · 47 kmHigh 27.9°C · Low 22.0°C · 21 mm rain
- Latina in AugustItaly · 61 kmHigh 29.6°C · Low 20.8°C · 24 mm rain
- Terni in AugustItaly · 64 kmHigh 31.6°C · Low 19.0°C · 33 mm rain
- Perugia in AugustItaly · 127 kmHigh 28.4°C · Low 16.6°C · 38 mm rain
- Pescara in AugustItaly · 132 kmHigh 28.7°C · Low 20.2°C · 39 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 Guidonia Montecelio) is explained once on the Guidonia Montecelio year overview and on the Sources, method and limits page.