WorkWindow

Concrete Pouring Weather in Pharr, TX: 10-Day Windows & Best Months

Pharr gives you roughly 165 workable concrete pouring days a year, concentrated October through April. The single best month is March, averaging 27 days that clear every check — highs of 83°F, lows near 63°F, and a 14% daily rain chance. Below: the live 10-day check and Pharr's full month-by-month table.

GOOD — a clean label day MARGINAL — one borderline check NO — hard fail or stacked flags

The rules this check uses

Typical bagged-mix requirements for small DIY pours, scored against Pharr's forecast above. The 48-hour freeze rule dominates every other row; structural work follows engineer/ACI specs instead of this table.

Typical label thresholds for concrete pouring — the ruleset behind every Pharr verdict above.
CheckThresholdWhy it matters
Air temperature 40–90°F — ideal 50–85°F DIY pours work from 40–90°F; 50–85°F is the sweet spot.
Overnight low ≥40°F during the first 48 h A low under 40°F inside the first 48 hours puts you in cold-weather concreting — not a DIY window.
Dry before no soaking (≥1.0") in the prior 24 h What fell before you start matters as much as what falls after — surfaces hold water invisibly.
Dry after <0.1" rain for 6 h after (12 h light rain after finishing still risks surface marks) The make-or-break window: rain here undoes the work, not just delays it.
Wind ≤20 mph (rapid surface drying up to 28 mph) Scored on the windiest working hour; the marginal band changes the method, not the day.

Always follow your product label — formulas vary. Treat the table as the consensus range across brands — the label in your hand is the final word.

Best months for concrete pouring in Pharr

How Pharr months rank: temperature-rule days minus NOAA rain odds, from 1991–2020 normals. An estimate for planning, not a forecast.
MonthAvg highAvg lowRain odds/dayWorkable days 
January 73°F 53°F 20% 25
February 78°F 57°F 16% 24
March 83°F 63°F 14% 27
April 88°F 68°F 13% 25
May 93°F 74°F 14% 0
June 97°F 78°F 17% 0
July 98°F 79°F 15% 0
August 100°F 79°F 17% 0
September 94°F 76°F 25% 0
October 89°F 69°F 19% 14
November 80°F 60°F 18% 25
December 74°F 54°F 19% 25

Figure 165 workable days a year in Pharr, spread across October through April. Shoulder months turn on the overnight rule: an afternoon at 89°F passes, but the 40°F night floor is what actually opens the season in October. Neighboring towns shift by a month or more — the Texas comparison shows where Pharr sits.

July here fails on heat, not rain: the average high of 98°F sits over the 90°F label ceiling, and 31 of 31 days typically top 90°F. Midsummer work moves to dawn or waits for March.

Sealing the same driveway later? Sealcoating in Pharr wants warmer nights (50°F+) than the pour did.

Climatology here is measured at Mcallen Miller Intl Ap, Tx Us (5.5 km away). Treat the monthly numbers as the neighborhood average; a shaded north-side deck runs colder and damper than any of them. The exact formula lives in the methodology.

Pharr by the numbers

Prep checklist

  1. Clear the 48-hour rule first: two nights over 40°F. October opens that door in Pharr; January (53°F average lows) slams it.
  2. Stage everything before mixing: forms braced, base compacted and damp, tools rinsed, help booked.
  3. Cut plastic sheeting and weight it at the pour's edge — Pharr sees rain on 14% of March days, and the 6-hour rule doesn't negotiate.
  4. Resist the watery mix: it finishes easier today and dusts forever after. Low slump wins.
  5. Work the sequence: screed on the sheen, float as it dulls, and leave bleed water alone.
  6. Edge and joint with an edger + float set — control joints every 2–3 slab-thicknesses in feet.
  7. Hold the moisture in (sheeting or misting); when April nights dip toward 68°F, a curing blanket is the difference.
  8. Traffic schedule: feet at 24–48 hours, tires near day 7. Anything structural runs on engineer/ACI specs, not this checklist.

Gear that saves a window

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FAQ

What temperature is too cold to pour concrete?

The line is a 40°F low inside the first 48 hours; an actual freeze (32°F) physically damages young concrete. Pharr's January nights average 53°F — firmly out — while March nights hold near 63°F. Small pours only; structural work follows engineer/ACI specs.

Can you pour concrete before rain?

The engine wants 6 protected hours; light rain later actually feeds the cure. With 25% rain-day odds in September versus 13% in April, Pharr's dry-season pours barely think about this rule and wet-season pours live by the radar. For small DIY pours; structural schedules follow ACI.

How long does concrete need to be protected from freezing?

Keep it above freezing for at least the first 48 hours (the engine calls any sub-40°F low in that window a NO). In Pharr that rules out roughly January-adjacent months entirely and makes shoulder-season pours a two-night forecast decision. DIY scope; anything structural follows engineer/ACI cold-weather practice.

Is it OK to pour concrete in hot weather?

To a 90°F high, yes — with shade, cool mix water, a damp subgrade, and a dawn start. Above 90°F the surface sets while the core is plastic and shrinkage cracks map the slab. Pharr averages 31 such days in July, which is why summer pours here move to first light.

How long before you can drive on new concrete?

A week before tires, 24–48 hours before feet — at March-typical Pharr temperatures (83°F highs). When nights slide toward 53°F, add days: cure speed is temperature. Early loads print permanent marks; the bag's cure table wins every argument.

Best season for concrete work in Pharr?

October through april — the months with 40°F+ nights, sub-90°F days, and manageable rain. March leads at 27 workable days; January bottoms out near 25.

Other projects in Pharr

Concrete Pouring nearby

Guides

Climatology: NOAA 1991–2020 normals via MCALLEN MILLER INTL AP, TX US (5.5 km from Pharr center, elevation 100 ft); live outlook by Open-Meteo.