Upvote:3
A very quick google for "[city] Portugal weather monthly" turned up these two links:
Guimarães climate and Coimbra climate, both of which have the monthly rainfall in mm per month.
Doing a google for "Coimbra, Portugal days of rain over 1mm" leads to Rainfall/ Precipitation in Coimbra, Portugal which says it has
On average there are 138 days per year with more than 0.1 mm rainfall
I can't find the equivalent for Guimarães, but every average monthly rainfall chart shows that the minimum amount of rain is in July and is typically around 12mm. This is roughly the same as Coimbra, so I'd expect a similar number of days of rain per year. But it seems that on average Guimarães gets less rain than Coimbra.