From Tarragona · 41.12° N · 1.24° E
Four getaways with a night away and three day trips from Tarragona for 15 August, the Assumption, four days before Sant Magí: high-mountain lakes in Andorra, the unspoilt Irta coast from the sea, the water of the Matarraña, the nights of Prades and cool cellars underground.
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July and August are the months for this getaway, with the Tristaina lakes at over 2,200 metres and free of snow. In August there is a storm almost every afternoon: start the lake circuit early and leave Caldea for the afternoon.

In July and August the hour-and-a-half boat along the Irta coast goes out, the only way to see it whole from the sea. The sierra track requires booking in the GVA Parcs Naturals app in summer: the boat saves you the car.

In summer the Matarraña swaps the Ports by 4x4 for the Pena reservoir, and the Parrizal is a walk beside water and in shade. The summer ticket has an hourly quota: buy it beforehand and go in early.

At a thousand metres, Prades cools at night, and in mid-August the Perseids join the telescope session. Book the astronomical park session and check the moon: with a full moon few shooting stars are seen.

The Codorníu cellars are underground and are toured by train at a cool temperature, the plan for the August midday. They also open in summer; book the visit and lunch at the tower.

In August the Coll de la Creueta, at 1,921 metres, is among the nearest cool roads, although with more traffic than in June or September. Set off very early and come down before the afternoon storms.

In August the Priorat is lived in the morning and at night: vineyards first thing, a spa among olive trees at midday and a long dinner with the region's wines. The charterhouse is closed on non-holiday Mondays; on 15 August it opens even if it falls on a Monday.
Questions
Yes, 19 August is a local holiday in the city of Tarragona, four days after the Assumption.
In Prades, at a thousand metres, at the Coll de la Creueta and at the Andorran lakes.
Geocaliahttps://www.geocalia.com/en/spain/catalonia/tarragona/getaways/august-long-weekend