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Why Does Water Come in Through My Window During Rain?

Last updated October 31, 2026

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The short answer

Common Causes of Window Leaks

The most frequent cause is old or cracked caulk around the window frame. Over time, sun and temperature changes make the sealant brittle, so water finds a path through. Another common issue is a window that is not latched completely, which leaves a small gap for rain to enter.

A poorly sloped sill can also pool water against the frame. If the sill tilts toward the interior, water runs inside instead of away. Check the exterior caulk and the sill slope before you look at more serious problems.

  • Cracked or missing caulk around the frame
  • Window not fully closed or latched
  • Sill sloped toward the inside of your home
  • Clogged weep holes in the window track
  • Worn weatherstripping along the sash
  • Gaps between the frame and the wall

How Rain and Wind Make It Worse

During a heavy storm, wind pushes raindrops sideways, so water hits the window with more force. That pressure can force water through tiny openings that would stay dry in a light drizzle. The direction of the wind matters too, a window facing the storm takes the brunt of the rain.

If your home is in a humid continental climate, you might see more issues after freeze-thaw cycles. Cold winters can expand and contract the frame, creating new gaps. Warm, humid summers can also cause wood frames to swell and shift, which weakens the seal over time.

What You Can Inspect Yourself

Start by looking at the exterior caulk around the window. Run a finger along it to feel for cracks or soft spots. Then check the sill from outside, pour a cup of water on it and see if it drains away from the house. If it pools, the slope is the problem.

Inside, look at the bottom of the window track. If you see water stains or dampness, the weep holes might be blocked. Clean them with a small wire or a pipe cleaner. Also check the weatherstripping around the sash for wear, a simple visual check can reveal gaps.

  • Inspect exterior caulk for cracks or gaps
  • Test the sill slope with a cup of water
  • Clean clogged weep holes in the track
  • Look for worn weatherstripping
  • Check the window latch for a tight seal
  • Look for water stains on the interior wall

When to Call a Professional

If you find the source but cannot fix it safely, or if the leak is coming from above the window, call in a pro. Water that appears on the ceiling or wall near the window might mean the flashing above is damaged. That type of repair often needs a roofer or a window installer.

Local water damage pros can also help if the leak has already caused rot or mold. They know how to dry out the area and prevent further damage. If you suspect structural issues, a pro should look before you patch anything.

Preventing Future Window Leaks

Regular maintenance is the right way to avoid leaks. Check the caulk and weatherstripping twice a year, before winter and before summer. Clean the window tracks and weep holes so water can drain freely. Trim back any tree branches that rub against the window and damage the seal.

If you live in Columbus, keep a simple checklist for after heavy storms. Look for damp spots on the sill or wall. Catching a small leak early is easier than dealing with water damage later. The pros can handle the repair, but you can prevent many issues with a quick inspection.

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Frequently asked questions

Can I fix a window leak myself?

You can fix simple issues like cracked caulk or a clogged weep hole. Clean the area, apply new exterior-grade caulk, and make sure the sill slopes away. If the leak comes from above the window or involves rot, call a pro to avoid further damage.

Why does water leak only during heavy rain?

Heavy rain brings wind, which pushes water sideways with more force. That pressure drives water through tiny gaps that stay dry in light rain. It might also mean the weep holes are blocked, so water backs up in the track and spills inside.

Should I replace the window or just the seal?

If the frame is solid and the leak comes from the seal, recaulking is usually enough. If the wood is rotten or the frame is warped, a replacement is often better. A pro can tell you the difference by checking the frame for soft spots.

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