← All Guides
Pouring Concrete in the Rain: What You Need to Know
Can you pour concrete in the rain? How rain affects fresh concrete and what precautions to take.
Light rain generally won't harm concrete, but heavy rain during or immediately after pouring can cause serious damage to the surface and strength.
Can You Pour Concrete in Rain?
- Light drizzle: Usually acceptable if cover is ready
- Moderate rain: Can cause surface damage, not recommended
- Heavy rain: Will wash out cement and ruin the surface - postpone pour
- Rain during finishing: Will create surface blemishes and weak spots
If Rain Is Forecast
- Postpone the pour if heavy rain is predicted
- Have tarps or plastic sheeting ready to cover fresh concrete
- Ensure proper drainage so water runs off the slab
- Keep finishers on standby to address surface issues
If Rain Starts During Pour
- Stop pouring and cover immediately with tarps
- Do not attempt to finish while rain is actively falling
- Protect edges to prevent water from getting underneath
- After rain stops, assess surface damage before continuing
Repairing Rain Damage
- Light surface marks: Can often be troweled out once surface dries
- Washed out areas: May require patching or resurfacing
- Severe damage: Full removal and replacement may be necessary
- Always document rain events for warranty purposes
Pro Tips
- Check hourly forecast before scheduling
- Have enough tarps to cover entire work area
- Weigh concrete truck driver against surface damage risk
- Concrete can handle rain once it reaches initial set (2-4 hours)
Important Warnings
- Rain on fresh concrete before set can permanently damage surface
- Water can wash out cement paste creating weak spots
- Exposed aggregate can be washed away by heavy rain