WorkWindow

Concrete Pouring Weather in Wilmington, NC: 10-Day Windows & Best Months

Wilmington gives you roughly 183 workable concrete pouring days a year, concentrated March through November. The single best month is October, averaging 22 days that clear every check — highs of 76°F, lows near 56°F, and a 28% daily rain chance. Below: the live 10-day check and Wilmington'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 Wilmington'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 Wilmington 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 Wilmington

How Wilmington 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 57°F 36°F 32% 0
February 60°F 38°F 33% 3
March 66°F 44°F 30% 22
April 75°F 53°F 28% 22
May 81°F 61°F 31% 21
June 87°F 69°F 37% 19
July 90°F 73°F 43% 9
August 88°F 72°F 43% 18
September 84°F 67°F 36% 19
October 76°F 56°F 28% 22
November 67°F 45°F 28% 22
December 60°F 39°F 32% 6

Figure 183 workable days a year in Wilmington, spread across March through November. Shoulder months turn on the overnight rule: an afternoon at 66°F passes, but the 40°F night floor is what actually opens the season in March. Neighboring towns shift by a month or more — the North Carolina comparison shows where Wilmington sits.

Summer's enemy here is the rain gauge: July sees measurable rain on 43% of days, so back-to-back dry 6-hour cure windows come in streaks, not on schedule. The 10-day strip earns its keep in August (43% wet days).

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

Climatology here is measured at Wilmington Intl Ap, Nc Us (6.4 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.

Wilmington by the numbers

Prep checklist

  1. Clear the 48-hour rule first: two nights over 40°F. March opens that door in Wilmington; January (36°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 — Wilmington sees rain on 28% of October 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 November nights dip toward 45°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

Heads up: product links on this page may become affiliate links when the program is enabled. See the affiliate disclosure.

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. Wilmington's January nights average 36°F — firmly out — while October nights hold near 56°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 43% rain-day odds in August versus 28% in April, Wilmington'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 Wilmington 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. Wilmington averages 16 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 October-typical Wilmington temperatures (76°F highs). When nights slide toward 36°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 Wilmington?

March through november — the months with 40°F+ nights, sub-90°F days, and manageable rain. October leads at 22 workable days; January bottoms out near 0.

Other projects in Wilmington

Concrete Pouring nearby

Guides

Climatology: NOAA 1991–2020 normals via WILMINGTON INTL AP, NC US (6.4 km from Wilmington center, elevation 33 ft); live outlook by Open-Meteo.