Best Indoor Activities for Kids on Rainy Days: Main Line PA

Rain on a Saturday morning is a Main Line parent's problem to solve. Once you've exhausted the inside-the-house options, there's a surprisingly good indoor kids programming landscape out there: library events, STEM clubs, makerspace programs, and enrichment classes that can fill a morning or afternoon with something genuinely worthwhile.

Here's what's available by category.

Library Programs: Free, Drop-In, and Actually Good

The public libraries on the Main Line punch well above their weight for kids programming. Story times, STEM clubs, book clubs, craft programs, and maker activities are regularly scheduled at most branches. Many require no registration and no fee.

Wayne Public Library has the deepest programming roster of any Main Line library branch. Their LEGO Lab is a favorite. Kids design and build with the library's collection in an open-ended engineering challenge format. They also run Math Fun with Arin, a hands-on math exploration program for elementary-age kids that's genuinely more engaging than it sounds.

Haverford Township Free Library (Havertown) runs LEGO Robotics workshops for ages 7–14 on Saturdays, where kids program LEGO MINDSTORMS and WeDo kits to complete engineering challenges. Free, but register about two weeks ahead; spots are limited.

Haverford Township Free Library STEM Club is a more structured science and technology program for school-age kids. Projects vary by session and include chemistry experiments, simple circuit building, and design challenges.

STEM and Maker Programs

Tredyffrin Public Library Makerspace for Kids (Berwyn) is one of the best makerspace programs on the Main Line. A dedicated space where kids can use 3D printers, laser cutters, and other tools in a guided setting. Significantly more sophisticated than typical kids craft programming, and appropriate for kids ages 8 and up who have an interest in building things.

STEM Lab Programs at Upper Main Line YMCA (Berwyn) bring structured science and technology education to the YMCA's dedicated STEM Lab facility at the Camp UMLY campus. Field trips, afterschool programs, and weekend workshops use the Environmental and STEM Education Complex, which includes a Watershed Lab and a full science classroom. One of the best-equipped STEM education facilities available to the general public on the Main Line.

Play-Well LEGO STEM Classes (through Lower Merion Recreation in Ardmore) use LEGO Technic, Mindstorms, and standard LEGO bricks to teach engineering concepts to kids ages 5 and up. The Play-Well curriculum is structured around real engineering principles: kids don't just build what they want, they solve specific design challenges. Available through the Lower Merion Rec registration system.

Snapology (Broomall and King of Prussia) is a STEM enrichment franchise that uses LEGO, coding platforms, and engineering kits to teach technology concepts to kids ages 2–14. Multiple program types including weekly classes, school break camps, and workshops. A consistent option for families in the southern and western Main Line.

Chester County Library Kids STEM Workshop (Exton) runs free hands-on STEM programming at the Chester County Library's main branch. Sessions vary but often include circuits, engineering challenges, and coding introductions. Free and open to the public.

Lavner Camps and Programs at Waldron Mercy Academy (Merion Station) offers tech and STEM camps during school breaks and summer, with programming in coding, game design, Minecraft modding, and robotics. One of the more accessible pathways into computer science for kids ages 6–14 on the Lower Main Line.

Chess Clubs

Chess works well on a rainy day, and Lower Merion Rec runs a club for kids.

Shining Knights Chess Club (through Lower Merion Rec in Ardmore) teaches strategy and sportsmanship to kids ages 5–14, beginners and experienced players alike.

For a Full Week Indoors: Emagination STEM Camps

Emagination STEM Camps at Rosemont College in Bryn Mawr run week-long sessions in summer and some school breaks. Programs cover game design, filmmaking, coding, robotics, and digital art. When you're planning ahead for a school vacation week and want something more intensive than a drop-in, Emagination is the best-structured STEM camp option on the Main Line.

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Quick Reference by Area

• Lower Merion, Ardmore: Play-Well LEGO (Rec), Shining Knights Chess (Rec)
• Havertown, Haverford: Haverford Library LEGO Robotics (free), STEM Club (free)
• Wayne: Wayne Public Library Lego Lab, Math Fun with Arin (free or low cost)
• Berwyn: Tredyffrin Library Makerspace, YMCA STEM Lab Programs
• Bryn Mawr: Emagination STEM Camps (seasonal)
• Broomall, King of Prussia: Snapology
• Exton: Chester County Library STEM Workshop (free)

Most library programs are free or very low cost and require checking the specific branch's calendar. Program schedules change seasonally, so always verify with the library before heading out.

Browse all STEM and enrichment programs on the Main Line.