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Driveway Sealing Weather in San Antonio, TX: 10-Day Windows & Best Months

San Antonio gives you roughly 109 workable driveway sealing days a year, concentrated March through May. The single best month is May, averaging 24 days that clear every check — highs of 86°F, lows near 66°F, and a 23% daily rain chance. Below: the live 10-day check and San Antonio'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 sealer-pail requirements, applied to San Antonio's forecast above; the site checks 36 cure hours as the midpoint of the 24–48 that labels quote. Rising temperatures matter as much as the number.

Typical label thresholds for driveway sealing — the ruleset behind every San Antonio verdict above.
CheckThresholdWhy it matters
Air temperature 55–90°F, and rising Sealer wants 55°F and rising — pavement must be warm enough to cure the emulsion.
Overnight low ≥50°F during the first 24 h The first 24 hours of cure need overnight lows of 50°F or better.
Dry before ≤0.05" rain in the prior 24 h What fell before you start matters as much as what falls after — surfaces hold water invisibly.
Dry after <0.05" rain for 36 h after (48 h cool or shaded driveways want 48 h) The make-or-break window: rain here undoes the work, not just delays it.
Evening dew-point spread ≥5°F from 6–11 pm Heavy evening dew can blush an uncured sealcoat.
Daytime humidity ≤85% Humid air slows evaporation, stretching dry times into the risky evening hours.
Wind ≤20 mph (dust and debris in wet sealer 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 driveway sealing in San Antonio

How San Antonio 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 63°F 40°F 28% 0
February 68°F 44°F 31% 0
March 74°F 51°F 28% 15
April 80°F 57°F 23% 23
May 86°F 66°F 23% 24
June 92°F 72°F 24% 2
July 94°F 74°F 20% 0
August 95°F 74°F 16% 0
September 90°F 69°F 24% 13
October 82°F 59°F 26% 23
November 71°F 49°F 23% 9
December 64°F 41°F 25% 0

Figure 109 workable days a year in San Antonio, spread across March through May. Shoulder months turn on the overnight rule: an afternoon at 74°F passes, but the 50°F night floor is what actually opens the season in March. Neighboring towns shift by a month or more — the Texas comparison shows where San Antonio sits.

July here fails on heat, not rain: the average high of 94°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.

Pouring before you seal? Concrete in San Antonio trades the pavement-warmth rule for a 48-hour freeze watch.

Climatology here is measured at San Antonio Incarnate Word, Tx Us (5.0 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.

San Antonio by the numbers

Prep checklist

  1. Wait for a rising pair: 55°F+ and climbing, first night over 50°F, 36 dry hours — in San Antonio that pattern lives March through May.
  2. Fill cracks a day ahead with crack filler so it skins before sealer covers it.
  3. Degrease oil spots and sweep to bare, dry asphalt — sealer bonds to pavement, not dust.
  4. Check yesterday, not just today: 24 h under 0.05" of rain. San Antonio's August makes that nearly automatic at 16% rain-day odds.
  5. Tape the garage slab and sidewalk lines with edging tape — drips on concrete are forever.
  6. Pull thin passes with a squeegee/brush combo, back-brushing the texture as you go.
  7. Start early at the top of the slope: a May morning coat gets the whole 86°F afternoon to break before dew.
  8. Keep tires off through the full cure — with May nights at 66°F, shaded strips need the long end of 24–48 h.

Gear that saves a window

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FAQ

What temperature do you need to seal a driveway?

55–90°F and rising, with the first night at 50°F or better. The 'rising' part is why San Antonio's March start matters: sealing on the front of a warm spell, not the back. Pavement lags air — a shaded slab can fail a passing afternoon.

How long after rain can I sealcoat?

24 hours after the last 0.05"+ rain, and only once cracks and shade strips are visibly dry — asphalt pores hold water after the surface grays out. In San Antonio's February (31% rain days) that lookback eats most of the calendar; August barely notices it.

How long does driveway sealer take to dry before rain or cars?

Plan 36 rain-free, car-free hours (labels range 24–48; shade and cool nights need the long end). A 0.05"+ shower inside the window streaks the coat gray. August is San Antonio's easiest month to find that window; February the hardest.

Can you seal a driveway in the fall?

Yes, until the nights quit. The 50°F overnight rule closes San Antonio's season after May; the classic October mistake is a 62°F Saturday over a 41°F night. Spring restarts around March when pavement warms.

How often should a driveway be sealed?

When the surface tells you: graying, no beading, spreading hairlines — typically every 2–4 years. In San Antonio, seal before the freeze-thaw season; January averages 40°F nights that pry open every unfilled crack. Fresh asphalt waits 6–12 months.

Best month to seal a driveway in TX?

For San Antonio: May and April — May leads with 24 workable days (high 86°F, rain on 23% of days, nights 66°F). Elsewhere in TX, the state page ranks every listed city by the same math.

Other projects in San Antonio

Driveway Sealing nearby

Guides

Climatology: NOAA 1991–2020 normals via SAN ANTONIO INCARNATE WORD, TX US (5.0 km from San Antonio center, elevation 700 ft); live outlook by Open-Meteo.