Viterbo in Summer
In summer (June, July and August), Viterbo sees average daytime highs around 29°C and overnight lows near 18°C, with 107 mm of rain over about 18 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 24°C in early June to 28°C by late August. The sky is clear or mostly clear about 70% of the time across summer, and the air most often feels humid.
Summer is Viterbo's best season of the year to visit on our travel score. For the whole year in context, see Viterbo's year-round climate.
- Avg daytime high
- 29°C
- warmest season of the year
- Avg overnight low
- 18°C
- Rainfall
- 107 mm
- 18 wet days
- Avg wind
- 8 km/h
- Travel score
- 6.6
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Viterbo in Summer
Over the season highs climb from about 24°C in early June to 28°C by late August.
A typical summer day in Viterbo reaches about 29°C and drops to 18°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Viterbo
Once humidity and wind are folded in, summer brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Viterbo weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 10° / 3° | 61 | 8.2 | 0.5 | 9.3 | 2.2 |
| Feb | 11° / 3° | 68 | 8.7 | 0.8 | 10.3 | 2.8 |
| Mar | 14° / 6° | 74 | 9.2 | 0.5 | 11.6 | 4.3 |
| Apr | 17° / 8° | 76 | 11.1 | 0.1 | 13.1 | 5.5 |
| May | 22° / 12° | 63 | 9.4 | 0 | 14.4 | 6.9 |
| Jun | 26° / 16° | 46 | 7 | 0 | 15 | 7.4 |
| Jul | 30° / 19° | 28 | 4.8 | 0 | 14.8 | 6.4 |
| Aug | 30° / 19° | 33 | 6 | 0 | 13.7 | 6.1 |
| Sep | 25° / 16° | 84 | 9.1 | 0 | 12.3 | 7.1 |
| Oct | 20° / 12° | 114 | 10.6 | 0 | 10.8 | 6.4 |
| Nov | 14° / 8° | 127 | 12.1 | 0.1 | 9.6 | 4.1 |
| Dec | 11° / 5° | 86 | 10.1 | 0.4 | 9 | 2.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 70% of the time across summer.
Chance of precipitation in Summer
Viterbo gets around 107 mm of rain over 18 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 8 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 54 min in early June to 13 h 06 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.7 kWh/m².
Is summer a good time to visit Viterbo?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Viterbo for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Viterbo in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Viterbo sees daytime highs around 29°C and nights near 18°C. Pack light clothes and sun protection. About 18 days see rain.
Sea temperature near Viterbo in Summer
The nearest coast averages about 24°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 40 km away) is warmest in August at about 25°C and coldest in February near 14°C.
It's comfortable for a long swim from Jun 2 to Oct 31 — about 5 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 15 | 14 | 14 | 15 | 18 | 22 | 24 | 25 | 23 | 21 | 19 | 16 |
| Comfort | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Warm | Warm | Refreshing | Refreshing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Bracing |
| Feb | 14 | Bracing |
| Mar | 14 | Bracing |
| Apr | 15 | Cool |
| May | 18 | Cool |
| Jun | 22 | Refreshing |
| Jul | 24 | Warm |
| Aug | 25 | Warm |
| Sep | 23 | Refreshing |
| Oct | 21 | Refreshing |
| Nov | 19 | Cool |
| Dec | 16 | Cool |
UV index in Viterbo in Summer
Clear-sky midday UV across summer averages around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Viterbo peaks around July 14 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 3 | 5 | 5 | 7 | 9 | 9 | 8 | 5 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 5 | Moderate |
| May | 7 | High |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 5 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Moderate |
| Dec | 1 | Low |
Where is Viterbo?
Viterbo sits at 42.4°N, 12.1°E, 326 m above sea level, in Italy. The nearest listed city is Civitavecchia, 44 km away.
Topography around Viterbo
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Viterbo.
Within 3 km, the terrain around Viterbo has significant variations in elevation — a maximum elevation change of 280 m around an average of 352 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,009 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,182 m.
The land around Viterbo is covered by trees (51%) and artificial surfaces (24%) within 3 km, trees (57%) and cropland (27%) within 16 km, and trees (47%) and cropland (20%) within 80 km.
Italy travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F / L
- 230 V · 50 Hz
- Prices
- ≈ 69% of US
- price level, 2025
- GDP per capita
- $43,309
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 97%
- of population, 2024
- Homicide rate
- 0.6
- per 100k, 2023
- Road deaths
- 5.3
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 513
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Viterbo (42.4194°, 12.1056°, elevation 326 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.