If you'd like some wet weather plans in your back pocket here are some of our favourites.
Our things to do page has hundreds of local things to do and the filter button enables you to filter things to do inside only.
https://www.mumsguideto.co.uk/hertford/things-to-do.php
Of course there is soft play: https://www.mumsguideto.co.uk/hertford/things-to-do.php?subcatname=Indoor-soft-play&subcatid=49
And many of the local museums are inside: https://www.mumsguideto.co.uk/hertford/things-to-do.php?subcatname=Museums-and-places-of-interest&subcatid=19
And of course there are the local cinemas (check out M4J for discounted tickets) https://www.mumsguideto.co.uk/hertford/things-to-do.php?subcatname=Cinemas-theatres-and-arts&subcatid=18
Or how about some indoor mini golf? https://www.mumsguideto.co.uk/hertford/listing.php?listingid=136&subcatid=&name=Mr-Mulligans-Lost-World-Golf&function=keywordsearch&keywords=golf&
Personally we are a big fan of just popping the waterproofs on and carrying on regardless.