Climate averages 1991–2020
Guidonia Montecelio weather
in July.
A hot, fairly dry month: the 2nd warmest and one of the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a hot month in Guidonia Montecelio: daytime highs average 31.1°C and nights cool to about 18.4°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 28 mm of rain on roughly 5 days, which makes July a fairly dry month (one of the driest months of the year). Daylight, from sunrise to sunset, lasts about 14 h 55 min on an average July day.
The nearest other city in this atlas is Rome (21 km away). In July its highs average 30.0°C, 1.1°C cooler than Guidonia Montecelio, with 23 mm of rain.
Among the 79 cities listed in Italy, Guidonia Montecelio ranks joint 5th of 79 for the warmest July highs and joint 33rd of 79 for the driest July (rainfall, lowest first). The mean July high of those 79 cities is 28.9°C; Guidonia Montecelio is 2.2°C warmer than that mean.
From July to August, average highs rise by 0.3°C to 31.5°C, and monthly rainfall stays at 28 mm.
The annual picture
July 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, selected | 31.1°C18.4°C | 18.4°C | 28 | 4.8 | 14.915 h |
| August | 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
July in nearby cities
- Rome in JulyItaly · 21 kmHigh 30.0°C · Low 19.4°C · 23 mm rain
- Acilia-Castel Fusano-Ostia Antica in JulyItaly · 41 kmHigh 27.7°C · Low 21.2°C · 15 mm rain
- Aprilia in JulyItaly · 45 kmHigh 28.3°C · Low 20.2°C · 19 mm rain
- Fiumicino in JulyItaly · 47 kmHigh 27.4°C · Low 21.4°C · 15 mm rain
- Latina in JulyItaly · 61 kmHigh 29.1°C · Low 20.0°C · 23 mm rain
- Terni in JulyItaly · 64 kmHigh 31.4°C · Low 18.5°C · 30 mm rain
- Perugia in JulyItaly · 127 kmHigh 28.2°C · Low 16.3°C · 31 mm rain
- Pescara in JulyItaly · 132 kmHigh 28.4°C · Low 19.9°C · 36 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.