The best time to go to Sandomierz is during the warmer months, specifically from May to September, when the weather is most pleasant for sightseeing and outdoor activities.
During these months, the temperatures are comfortable, ranging from mild to warm, making it ideal for exploring the Old Town and its surroundings on foot. You'll find most attractions, including the underground tourist route and the cathedral, are fully operational with extended hours. The Wisła River also offers opportunities for boat trips during this period.
For those who prefer a livelier experience with cultural events, July and August are particularly good. Sandomierz often hosts various festivals and outdoor concerts, adding an extra dimension to your visit. The long daylight hours allow for more extensive exploration of the city's historic sites and the picturesque Sandomierz Gorge.
If you prefer to avoid the peak tourist crowds while still enjoying good weather, May, early June, and September are excellent choices. The city is still vibrant, but with a more relaxed pace, allowing for a more intimate experience of its medieval charm.