Can you pour concrete in Austin in the summer?

Yes. Summer pours are planned for early morning, with mix adjustments and immediate curing. Austin's July and August normal highs are 96.6 F and 97.8 F at Camp Mabry, with 28.7 days a year at or above 100 F (NOAA 1991-2020 normals).

What is too hot to pour concrete?

There isn't one air temperature cutoff. ACI 305R defines hot weather as any mix of high air and concrete temperature, low humidity, wind and sun that speeds moisture loss and setting, and NRMCA's hot-weather guidance cites concrete temperature limits around 90 to 95 F. The ready-mix supplier and the contractor manage the concrete temperature.

How do you keep concrete cool in hot weather?

NRMCA says chilled mixing water can lower concrete temperature by up to 10 F and ice by up to 20 F; producers also shade and sprinkle aggregate piles. On site, early pours, shade and fast placement help.

How long should concrete cure in Texas heat?

NRMCA's curing guidance says curing should continue for a sufficient period, typically 3 to 7 days, starting immediately after finishing. Concrete that dries out can lose as much as 50 percent of its potential strength compared with moist-cured concrete.

Should I spray water on new concrete?

On the finished, hardened surface as a curing method, yes: continuous fogging or sprinkling is an accepted cure. Alternate wetting and drying is not, and sprinkling water onto the surface to make finishing easier is a mistake that weakens it.

Is winter better for pouring in Austin?

Mild winters help, but Austin still averages 11.9 nights a year at or below freezing (NOAA). Fresh concrete should be kept above 50 F while it cures, per NRMCA, so a cold snap needs covers just as a heat wave needs curing.

Pouring Concrete in Texas Heat: An Austin Guide

Last reviewed October 2026.

Pouring concrete in Austin heat: the numbers

Austin gets about four weeks a year at or above 100 F, mostly in July and August. These are NOAA's 1991 to 2020 normals for Camp Mabry, the city's long-running weather station:

Austin (Camp Mabry) monthly normals, warm season

Month	Normal high	Days 90 F+	Days 100 F+	Rain
May	86.9 F	11.1	0.3	5.04 in
June	93.2 F	23.8	3.1	3.68 in
July	96.6 F	29.0	9.5	1.96 in
August	97.8 F	29.2	13.3	2.74 in
September	91.4 F	20.0	2.6	3.45 in
October	82.5 F	6.4	0	3.91 in

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NOAA NCEI 1991-2020 monthly normals, station USW00013958. Year: 122.8 days at or above 90 F, 28.7 at or above 100 F, 11.9 nights at or below 32 F, 36.25 in of rain.

What heat does to fresh concrete

Hot weather is more than air temperature. ACI 305R, as quoted in NRMCA's CIP 12, defines it as any combination of high air temperature, high concrete temperature, low humidity, high wind and sun that speeds moisture loss and cement hydration. The effects NRMCA lists:

More water needed for the same slump, which raises the water-cement ratio and lowers strength
Faster slump loss and faster setting, so finishing has to move quicker
Plastic shrinkage cracks when the surface dries before the concrete sets
Thermal cracking when a hot day is followed by a cool night
Lower strength later on for concrete cured hot than for concrete cured around 70 F

Worker running a vibrating power screed across a freshly poured concrete slab — A vibrating screed levels and consolidates the surface in one pass. Stock photo, not a job by this site.

How a summer pour is run in Austin

1
Schedule around the heat
Book the pour for early morning and plan for the trucks to discharge on arrival. NRMCA advises avoiding the hottest part of the day for placing and finishing.
2
Ask about the mix
Water-reducing and set-retarding admixtures, chilled water or ice in the mix, and supplementary materials like fly ash or slag cement all help in hot weather.
3
Prepare the site
Dampen the base without leaving standing water, set up shade or windbreaks if it's hot, dry and windy, and have enough people on hand to place and finish without delay.
4
Place and finish without adding water
NRMCA says not to sprinkle water on the surface to help finishing; fog or evaporation retarders protect the surface instead.
5
Cure right away
Start curing immediately after finishing and keep it up for 3 to 7 days: wet curing, covers or a curing compound.

Austin humidity swings

NRMCA notes that high humidity tends to reduce the effects of heat. Austin's humidity varies with the wind: moist Gulf air on southeast winds, dry air on westerlies. A hot, dry, breezy afternoon is the worst case for a fresh slab surface, and that's when shade, windbreaks and fogging earn their keep.

Curing in the heat

Curing is keeping the new slab moist and at a good temperature while it gains strength. NRMCA's CIP 11 says it starts immediately after finishing and typically lasts 3 to 7 days, and that concrete in a dry environment can lose as much as 50 percent of its potential strength compared with moist-cured concrete.

Curing methods (NRMCA CIP 11)

Method	How it works	Hot weather note
Fogging or sprinkling	Keeps the surface wet continuously	Excellent, if it never dries out between passes
Ponding	Water held on the slab by a small dam	The most thorough water cure
Wet coverings	Burlap or curing blankets kept damp	Re-wet often in the sun
Plastic sheeting	Traps the slab's own moisture	Weight the edges so wind can't lift it
Curing compound	Sprayed membrane that seals moisture in	Apply right after finishing

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Alternate wetting and drying is not an acceptable curing practice, per NRMCA.

Joint layout to plan before pouring concrete in Austin heat: saw cuts within 4 to 12 hours, about every 10 feet on a 4 inch slab — Our own diagram from NRMCA joint guidance. Not to scale.

Joints come sooner in the heat

NRMCA's joint guidance says conventional saw cuts go in within 4 to 12 hours after finishing; hot weather speeds setting, which pulls that window earlier. Saw too late and the slab picks its own crack lines.

Pouring Concrete in Texas Heat in Austin