WorkWindow

Concrete Pouring Weather in St. Augustine, FL: 10-Day Windows & Best Months

By NOAA 1991–2020 normals, St. Augustine keeps a concrete pouring window open in all 12 months — a year-round season few US cities match. The single best month is May, averaging 23 days that clear every check — highs of 85°F, lows near 67°F, and a 25% daily rain chance. Below: today through day 10 against the label rules, then the year at a glance.

GOOD — every label check passes MARGINAL — one soft fail NO — hard fail or several soft

The rules this check uses

The St. Augustine strip runs on these rows — bagged-mix consensus for DIY-scale work, ruled by the 48-hour freeze check. Structural pours answer to an engineer and ACI, not to this page.

Typical label thresholds for concrete pouring — the ruleset behind every St. Augustine verdict above.
CheckThresholdWhy it matters
Air temperature 40–90°F — ideal 50–85°F The film (or mix) chemistry runs on temperature — both while you work and for the first hours after.
Overnight low ≥40°F during the first 48 h Curing continues after dark; the first night can undo a perfect afternoon.
Dry before no soaking (≥1.0") in the prior 24 h Checked backward from your start hour using the two look-back days in the forecast data.
Dry after <0.1" rain for 6 h after (12 h light rain after finishing still risks surface marks) The engine sums forecast rain hour by hour through the cure window for St. Augustine.
Wind ≤20 mph (rapid surface drying up to 28 mph) Hot wind pulls bleed water out faster than the slab can handle.

Always follow your product label — formulas vary. The table above is the typical range across major manufacturers, not a promise about your can.

Best months for concrete pouring in St. Augustine

St. Augustine's calendar, scored: each month's days passing the temperature rules, discounted by that day's historical rain odds (NOAA 1991–2020). Not a forecast.
MonthAvg highAvg lowRain odds/dayWorkable days 
January 68°F 48°F 29% 22
February 70°F 50°F 28% 21
March 74°F 55°F 27% 23
April 80°F 61°F 24% 23
May 85°F 67°F 25% 23
June 89°F 72°F 39% 18
July 91°F 74°F 41% 0
August 90°F 74°F 46% 10
September 87°F 73°F 44% 17
October 82°F 66°F 31% 21
November 75°F 58°F 27% 22
December 69°F 51°F 28% 22

St. Augustine's calendar never really closes: even January, the leanest month, averages 22 workable days against the 40–90°F rules. The 10-day strip above matters more here than any season chart. The Florida table ranks every listed city by the same math.

July here fails on heat, not rain: the average high of 91°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 May.

The rain odds swing hard across the year — 24% of days in April up to 46% in August. Season the plan accordingly: prep in the wet months, apply in the dry ones.

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

Source honesty: every monthly figure on this page is the 1991–2020 normal at St Augustine Lighthouse, Fl Us, 2.4 km from St. Augustine's center — your block's shade lines and wind exposure sit on top of that baseline. Scoring details are on the methodology page.

St. Augustine by the numbers

Prep checklist

  1. Clear the 48-hour rule first: two nights over 40°F. August opens that door in St. Augustine; January (48°F average lows) slams it.
  2. Nothing gets mixed until the site is staged — braced forms, compacted damp base, rinsed tools, a second pair of hands.
  3. Cut plastic sheeting and weight it at the pour's edge — St. Augustine sees rain on 25% of May days, and the 6-hour rule doesn't negotiate.
  4. Mix to a low slump — thick oatmeal, not soup; extra water now is a weak surface forever.
  5. Timing beats muscle — screed wet, float at the dull stage, and never chase bleed water with a trowel.
  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 June nights dip toward 72°F, a curing blanket is the difference.
  8. Keep feet off 24–48 hours and cars off a week; structural pours follow the engineer and ACI, full stop.

Gear that saves a window

Transparency note: gear links here become affiliate links only when the program is enabled — today they are plain references. 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. St. Augustine's January nights average 48°F — firmly out — while May nights hold near 67°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 46% rain-day odds in August versus 24% in April, St. Augustine'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 St. Augustine 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. St. Augustine 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 May-typical St. Augustine temperatures (85°F highs). When nights slide toward 48°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 St. Augustine?

The table above says May, April and March: enough warmth for the 48-hour cure, short of the 90°F ceiling. For small DIY pours that's the whole answer; structural pours schedule to engineer/ACI requirements, not to a best-months chart.

Other projects in St. Augustine

Concrete Pouring nearby

Guides

Climatology: NOAA 1991–2020 normals via ST AUGUSTINE LIGHTHOUSE, FL US (2.4 km from St. Augustine center, elevation 12 ft); live outlook by Open-Meteo.