Can You Pour Concrete in the Rain?

Pouring Concrete in the Rain: What You Need to Know

Rain during a concrete pour can ruin your project—or it might be fine, depending on timing and intensity. Understanding when rain is a problem and when it's manageable helps you make the right decision.

Light Mist: Usually Fine

Light mist or drizzle during or immediately after pouring is typically manageable if:

• Concrete has started to set (not soupy)
• You can protect the surface
• Rain is light and brief

Light moisture can actually help with curing by keeping the surface moist.

Heavy Rain: Big Problem

Heavy rain during or right after pouring causes serious problems:

Surface Damage

• Washes away the cement paste (the "cream")
• Exposes aggregate prematurely
• Creates a rough, sandy surface
• Weakens the top layer

Long-Term Effects

• Dusting (surface flakes off)
• Flaking and spalling
• Reduced surface strength
• Poor appearance

When Rain Hits

Before concrete sets: Rain dilutes the mix, weakening it

During finishing: Rain ruins the surface finish

After setting: Less problematic, but can still cause issues

Protection Methods

If rain is expected:

• Cover with plastic sheeting
• Use curing blankets
• Reschedule if possible
• Have protection ready before you start

The Bottom Line

Light mist is usually manageable with proper protection. Heavy rain will damage the surface and weaken the concrete. When in doubt, reschedule. It's better to wait than to pour in conditions that will ruin your work.

Professional contractors watch weather closely and reschedule when necessary. Don't risk your investment by pouring in bad conditions.