More often than not you can expect weather in Treviso in July is 12. Throughout the month you should see a high of 19 with low average temperatures being 9. The table below has some further insights:
 

 

Treviso, Italy Weather in July FAQs

So what is the weather like then?

Normally the weather is 12 celsius although it will generally vary during the day and night

Generally what are the summer months like?

Typically the weather in summer is 25 degrees

Useful Links: Treviso Weather: Average Weather & Yearly Climate