The highest day temperature in May 2026 was 90°F. The lowest night temperature was 39°F. The average values for day and night temperatures during May were 73.1°F и 53.0°F respectivly.

Most of the days in May are sunny but you can also expect cloudy and gloomy days.

Precipitation total in May for Viterbo is 0.8 in.

The average wind speed in May is 5.5 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Viterbo in May is 9.0 hours.