Pouring Concrete in the Rainy Season: How We Schedule Around Afternoon Storms
Pouring concrete in the rainy season
From June through September the Kissimmee 2 NOAA station averages 15.8, 16.7, 17.7 and 14.3 days a month with measurable rain, and 12 or 13 of those days bring more than a tenth of an inch, almost all of it in afternoon sea-breeze storms. We pour through the season with one rule: the truck is on site at first light, the slab is placed, finished, jointed and covered before 2 p.m., and a morning forecast over 60 percent for rain before 2 p.m. moves the pour a day.
What rain does to concrete at each stage
| Stage | Light rain | Downpour | What we do |
|---|---|---|---|
| Before the pour (forms and base set) | Nothing | Saturates the base; standing water in forms | Pump or wait; never pour into standing water |
| During placement | Fine; slightly more water at the surface | Washes cement out of the top; ruins the surface | Cover with plastic immediately; stop the truck |
| Finishing (bleed water, edging, brooming) | Delays finishing; risk of marks | Weak, scaling surface for life | Cover; re-broom after it passes if still workable |
| First hours after finishing | Helpful (moist curing) | Pitting if very heavy in the first hour | Cover with plastic held off the surface; joints cut on time |
| After 24 hours | Helpful | Helpful | Nothing; concrete cures better wet |
The day-of routine
- Radar and forecast at 5 a.m.; the decision is made before the truck is dispatched.
- Forms, base and steel are done the day before; the crew is standing when the truck arrives at daylight.
- Pours are sized to be finished by late morning; a 480-square-foot driveway is one truck and done by 10.
- Plastic sheeting and stakes are on site; if a cell builds early, the slab is covered before the first drops.
- Joints are tooled during finishing or saw-cut the same afternoon once the surface can take a saw.
- Cure compound or wet cover goes on before the crew leaves; the storm that arrives at 3 p.m. is then good for the slab.
Overlays, sand and sealers are less forgiving
A polymer overlay is a fraction of an inch thick and a downpour 30 minutes after placement takes it off. Polymeric sand needs a dry day and a dry night to harden; sealers need 24 hours without rain to cure clear. For those we book a morning with a clear radar and we reschedule rather than gamble; expect one lost day in a rainy-season schedule and none from October to April. The Pour Calendar shows the month-by-month numbers and the plan for each type of work.
Hurricane season
June 1 to November 30. A named storm in the five-day forecast pauses scheduling: no forms left open, no material staged in a yard that will flood, no pours the day before landfall. After a storm the queue is long; homeowners with a driveway that flooded or a slab that lifted get triage visits first.
What happens if rain arrives at each stage
| Stage | Rain during it | What we do | Effect on the finished slab |
|---|---|---|---|
| Base preparation | Light | Keep working; limerock compacts better slightly damp | None |
| Base preparation | Heavy | Stop; the subgrade turns to soup and cannot be compacted | Delay of a day or two while it drains |
| Placing concrete | Light shower | Keep placing; do not add water; cover finished areas | Usually none if the surface is not worked wet |
| Placing concrete | Downpour | Stop the truck, tarp what is down, resume or cut a cold joint | A planned joint instead of a random one |
| Floating and troweling | Any | Stop and cover; working rainwater into the surface is what causes scaling | Scaling and a dusty surface if ignored |
| First 2 hours after finishing | Any | Cover with plastic on supports so it does not touch the surface | Pitting and washed-out cement paste if uncovered |
| After 12 hours | Any | Nothing; rain is now helping the cure | None |
Reading a Central Florida forecast for a pour
A 60 percent chance of rain in Kissimmee in July does not mean a 60 percent chance your pour gets wet. It usually means the sea-breeze collision will fire storms somewhere in the county between 2 and 6 p.m. The number that matters to us is the timing, not the probability, so we watch the morning radar and the hourly breakdown rather than the daily percentage. A slab placed at 7 a.m. and finished by 11 is out of the risk window before the first cell forms.
The NOAA normals for the Kissimmee 2 station tell the same story in averages: June through September carry 15.8, 16.7, 17.7 and 14.3 days with measurable rain, and 12.3, 12.2, 13.0 and 9.5 of those days exceed a tenth of an inch. October through April drop to between 5.7 and 8.7 days. The rain is not spread through the day; it is concentrated in the afternoon, which is exactly why the pour window exists. The month-by-month table is in the Pour Calendar.
Hurricane season and the schedule
The Atlantic season runs June 1 to November 30, and its effect on our schedule is less about the storm than about the week around it. When a named system is forecast to affect Central Florida, we stop starting new excavations three days out, because an open base trench fills and has to be rebuilt. Freshly placed concrete is safe once it has set; a slab poured two days before a storm is in better shape than a base sitting open.
After a system passes, the ground stays saturated for several days on flatwoods sand, and that is the delay homeowners feel. The Polk ridge drains faster, so Davenport and Haines City jobs restart a day or two before Osceola jobs do (Paver Base on Flatwoods Sand vs. Ridge Sand: Osceola and Polk Are Not the Same). We reschedule in order of who was interrupted, and we say so in advance rather than promising a date we cannot hold.
What a postponement actually costs
Homeowners sometimes push for a pour to go ahead on a marginal morning because a delay feels like lost time. It is worth knowing what the two options really cost. A postponement is one day, occasionally two if the ground needs to drain, and nothing else changes. A slab finished in the rain can mean a surface that scales and dusts within a year, which is a resurfacing job at half the cost of the original pour, or in a bad case a slab that comes out.
So our default is to move the pour, and we would rather have that argument in the morning than the conversation about scaling eight months later. The forms, the base and the steel keep; the concrete does not.
What we tell customers in June
Expect the start date to be a window rather than a date. Expect an early start, often before seven. Expect the crew to make the call on the morning based on radar rather than on the forecast from three days earlier. And expect one postponement in a typical rainy-season job, which is normal rather than a sign that anything is wrong.
What you should not expect is a pour going ahead in the rain because the schedule said so. The forms and the base keep; the concrete does not, and a slab finished under a downpour is a resurfacing job within a year.
Questions we get about this
Can you pour concrete in the rain in Florida?
Not during rain. We pour before the afternoon storms, finish and cover; rain after the first hours helps the cure.
What if it rains on fresh concrete?
In the first hour a downpour can pit or wash the surface; covered, it is fine. After 24 hours rain is good for it.
Is summer a bad time for a driveway?
It is the busiest and the wettest; the work is fine with early starts. Sealing and sanding lose the occasional day.
What time do you start?
Trucks at daylight in summer; a two-car driveway is finished by mid-morning.
Will you pour if rain is forecast?
Often yes, with an early start, because the forecast is for the afternoon. We move the pour when the morning hours themselves look wet.
Does rain ruin fresh concrete?
Rain during finishing does, by washing cement from the surface and causing scaling. Rain after the slab has set is harmless and helps the cure.
What is the best month for a driveway in Kissimmee?
October through April, when rain days drop to six or seven a month. May and the early fall work well too; the constraint is the afternoon storm, not the month.
Get a written estimate for your project
Tell us the size, the surface you have now and where the lot is. We visit, measure, check access and drainage, and send a written proposal. No pressure calls.
What changed in this update: 2026-09-11 — first published