Viterbo sits on the slopes of the Cimini Mountains in northern Lazio at 326m (1,070ft) above sea level, giving it a Mediterranean climate with continental influences. Summers are hot and dry, winters are cool and wet, and the shoulder seasons bring the most comfortable conditions for exploring the medieval streets. The city averages 13.9degC (57degF) annually and receives around 898mm (35.4 inches) of rain per year, with November the wettest month at 136mm. For visit, see our best time to visit Viterbo.
Viterbo Weather by Month: Temperature and Rainfall
| Month | Avg High (degC/degF) | Avg Low (degC/degF) | Rainfall (mm) | Rain Days | Sun Hours |
|---|---|---|---|---|---|
| January | 10 / 50 | 2 / 36 | 71 | 14 | 4 |
| February | 12 / 54 | 3 / 37 | 88 | 13 | 5 |
| March | 15 / 59 | 5 / 41 | 67 | 12 | 6 |
| April | 17 / 63 | 7 / 45 | 76 | 13 | 7 |
| May | 22 / 72 | 11 / 52 | 61 | 10 | 9 |
| June | 27 / 81 | 15 / 59 | 47 | 8 | 10 |
| July | 30 / 86 | 17 / 63 | 29 | 5 | 11 |
| August | 31 / 88 | 18 / 64 | 38 | 6 | 10 |
| September | 26 / 79 | 15 / 59 | 76 | 9 | 8 |
| October | 20 / 68 | 11 / 52 | 113 | 11 | 6 |
| November | 14 / 57 | 7 / 45 | 136 | 14 | 4 |
| December | 10 / 50 | 3 / 37 | 96 | 14 | 4 |
Viterbo Weather by Month: Winter (December to February)
Winter in Viterbo is cool and damp. Daytime highs hover around 10degC to 12degC (50degF to 54degF) while nights drop to 2degC to 3degC (36degF to 37degF). Frost occurs roughly 6 days per year, usually in January. December is the darkest month with just 4 hours of daily sunshine. You’ll want a warm coat and waterproof shoes, especially in November and December when rain days peak at 14 per month. Snow is rare in the city center but can dust the Cimini Mountains above 800m. For in, see our things to do in Viterbo.
Viterbo Weather by Month: Spring (March to May)
Spring brings rapid warming. March starts at 15degC (59degF) with 12 rain days but by May you’ll see 22degC (72degF) and only 10 wet days. April averages 17degC (63degF) with 13 rain days and 7 hours of daily sun. This is when the countryside around Viterbo turns green and wildflowers bloom across the Tuscia region. Pack layers: mornings can be chilly at 5degC (41degF) in March, but afternoons warm up nicely for outdoor cafes and thermal baths. For and, see our Viterbo events and festivals.
Viterbo Weather by Month: Summer (June to August)
Summers are hot and dry with July and August both averaging highs above 30degC (86degF). The mercury can push past 35degC (95degF) during heatwaves. Rain is minimal, just 29mm in July (5 rain days) and 38mm in August (6 days). Sunshine peaks at 11 hours daily in July. The low humidity makes the heat more bearable than coastal areas, but the stone streets of the centro storico radiate heat. Most locals take August off for ferragosto and many smaller shops close for one to two weeks. The Terme dei Papi thermal pool complex is open but crowded. For neighborhoods, see our Viterbo neighborhoods guide.
Viterbo Weather by Month: Autumn (September to November)
September starts warm at 26degC (79degF) with 8 hours of daily sunshine, making it one of the best months to visit. This is when Viterbo hosts the Macchina di Santa Rosa on September 3rd, with comfortable evening temperatures around 15degC (59degF). Rain picks up in October (113mm, 11 days) and explodes in November (136mm, 14 days), the wettest month of the year. By November, daytime highs drop to 14degC (57degF). The autumn foliage in the Cimini Hills and the chestnut harvests in the surrounding villages make October a rewarding month despite the rain risk. For in, see our where to stay in Viterbo. For more practical information, see our Viterbo travel tips and FAQ.
