Quieter indoor spots in Dublin for bad weather?

For indoor alternatives to Dublin Castle and St Patrick's Cathedral, the National Library of Ireland and the National Gallery of Ireland are great options on the city's sight list. If you want to time your trip for milder conditions, the best season runs from May through October, when average temperatures range between 12.1°C and 16.1°C. During colder months like January, temperatures average around 6.1°C. When conditions clear up, the open grounds of Phoenix Park also offer plenty of space away from downtown sights like the Spire of Dublin.