Rain on fresh concrete is a surface problem, not a reason to stop work: pour on a dry forecast window, choose a mix that sets on schedule, cover the slab as soon as it is finished, and keep it damp for several days of curing. Los Angeles winters are mild, but storms arrive fast and cooler nights slow the set, so slab, footing and post work from November through February needs a plan. This guide matches stocked bagged mixes to wet-season pours and walks through protection and curing.
Which mix suits a wet-season pour?
Pick the mix by how quickly you need the surface to firm up. The table compares the bagged options we stock; details follow.
| Mix |
Strength |
Set behavior |
Best for |
| Fast-Setting (50 lb.) |
4000 psi |
Hardens 20-40 minutes |
Posts, small pads |
| Crack Resistant (50 lb.) |
4000 psi |
Standard set |
Slabs, walkways |
| Concrete Mix (60 lb.) |
4000 psi |
Standard set |
Footings, steps |
| Concrete Mix (90 lb.) |
4000 psi |
60-minute working time |
Walls, curbs, ramps |
Fast-setting mix for short weather windows
The fast-setting PSI-4000 mix is made to harden in 20 to 40 minutes, and it is set up for posts without mixing: pour the dry mix into the hole and soak it with water. That makes it the practical pick for fence posts and small pads when the forecast gives you a short dry gap. Its notes also list steps, sidewalks and slabs where a quick set is needed.
Crack-resistant and general-purpose mixes
The crack-resistant PSI-4000 mix contains fibers and admixtures to reduce cracking from drying shrinkage and is designed for slab-on-grade work without wire mesh. For footings and general work, the 60 lb. PSI-4000 mix and the 90 lb. mix, with a 60-minute working time, cover most jobs; the 90 lb. bag is meant for pours 2 in. thick or more. Compare all of them in our bagged concrete mix comparison and browse the concrete mix collection.
Plan the pour around the forecast
Check the hourly forecast, not the daily one. You need enough dry time to place, screed, float and finish the surface before rain arrives. If rain is likely within a few hours of finishing, postpone the pour or have cover ready before you start. Order the right bag count the day before using the bag count guide, so you do not stop mid-pour.
Prepare the site so water leaves
Slope the base so water runs off instead of ponding on or under the slab, and keep standing water out of footing trenches. Our erosion control guide and aggregate guide cover base rock and drainage. For reinforcement, see the slab reinforcement comparison.
Protect fresh concrete from rain
Cover the finished surface with plastic sheeting held down at the edges so it does not touch the wet surface, and avoid walking on it. Light rain on an unprotected, uncured surface can pit it and weaken the top layer, while a covered slab sheds water safely. Remove any standing water from the cover rather than letting it pool. Use the rain-ready checklist to stage tarps, stakes and drainage materials before the first storm.
Curing in cool weather
Concrete gains strength through hydration, not drying, so keep the surface damp and protected for several days after the pour. Cooler nights slow the set, so allow more time before removing forms or loading the slab, and check the bag label for working and cure times. Posts set with fast-setting mix reach full strength on the bag schedule, not when the surface feels hard.
Forms and finishing
Column and footing tubes keep round pours clean; our concrete forms guide explains them. After the slab has cured, a sealer protects the finish; read the concrete sealers comparison before you choose.
Wet-season pour checklist
- Check the hourly forecast and set a dry window
- Choose fast-setting mix for posts and small pads
- Order bag counts a day ahead with a small buffer
- Slope the base and clear standing water
- Stage plastic sheeting and stakes before you mix
- Cover the finish and keep it damp for several days
- Hold off on sealing until the slab has cured
Conclusions
A wet-season pour is manageable with the right mix, a dry window and cover ready before you start. Use fast-setting mix for posts, crack-resistant or general-purpose mix for slabs and footings, and protect and cure the concrete for several days. Order the mix, forms and base rock together so the job is not delayed by a storm.
