Other days can be extremely hot, up to 40degrees coleus. It depends on the year. Whatever the weather is like during the day, the nights are always a bit cool, particularly those dark hours just before dawn.
This is the time when many a reveller is inadvertently parading from bar to bar in light dress oblivious to the change in temperature. The consequences of which will appear a day or two later in the form of colds, flu, and hoarseness etc. So, take a jersey or pullover for the nights and remember to bring some rainwear, just in case.
Show the weather in Navarra Meteo Agency.