You can expect it to be warm to hot in the cities and seaside locations, and about 10 degrees Celsius colder in the mountains (where it can get cold at night).
Forecasts are available from these sites:
Keep in mind that Udine's location between sea and mountains is challenging, by weather forecasting technology standards.
In early July the sun is expected to rise shortly before 05:30 and set at around 21:00 (the time zone is CEST, i.e. UTC+2).