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Driveway Sealing Weather in Davenport, IA: 10-Day Windows & Best Months

In Davenport, the label math works from May through September: that's the stretch with 8+ workable days a month against typical driveway sealing rules. The single best month is August, averaging 22 days that clear every check — highs of 82°F, lows near 63°F, and a 30% daily rain chance. The strip above runs Davenport's live forecast; the table below ranks all 12 months.

GOOD — clears every rule MARGINAL — exactly one soft miss NO — a hard fail, or two soft

The rules this check uses

This table is the whole Davenport check: pail-consensus thresholds, the rising-trend requirement, and a 36-hour cure standing in for the labels' 24–48 spread.

Typical label thresholds for driveway sealing — the ruleset behind every Davenport verdict above.
CheckThresholdWhy it matters
Air temperature 55–90°F, and rising Checked across the working day, 8 a.m.–6 p.m., against Davenport's hourly forecast — not just the daily high.
Overnight low ≥50°F during the first 24 h The engine reads every overnight hour in the cure window, not just Davenport's forecast low.
Dry before ≤0.05" rain in the prior 24 h Asphalt must be fully dry; sealer will not bond to damp pavement.
Dry after <0.05" rain for 36 h after (48 h cool or shaded driveways want 48 h) Most sealers list 24–48 dry hours; this site checks 36.
Evening dew-point spread ≥5°F from 6–11 pm Scored on the worst hour between 6 and 11 p.m., when surfaces cool past the air.
Daytime humidity ≤85% Water-based sealer dries by evaporation; humid air stalls it.
Wind ≤20 mph (dust and debris in wet sealer up to 28 mph) Wind wrecks application first (drift, lap marks) and carries debris into wet work second.

Always follow your product label — formulas vary. These rows are the industry-typical range; the can in your Davenport garage is the contract.

Best months for driveway sealing in Davenport

Workable days in Davenport, IA: days meeting the temperature rules, discounted by NOAA rain odds — a 1991–2020 estimate, not a forecast.
MonthAvg highAvg lowRain odds/dayWorkable days 
January 31°F 13°F 33% 0
February 36°F 18°F 32% 0
March 48°F 28°F 33% 0
April 61°F 39°F 40% 0
May 72°F 51°F 42% 11
June 81°F 61°F 38% 19
July 84°F 65°F 30% 22
August 82°F 63°F 30% 22
September 77°F 55°F 29% 20
October 64°F 43°F 30% 0
November 49°F 30°F 33% 0
December 36°F 20°F 33% 0

Figure 93 workable days a year in Davenport, spread across May through September. Shoulder months turn on the overnight rule: an afternoon at 72°F passes, but the 50°F night floor is what actually opens the season in May. For the statewide picture, the Iowa page compares peak months city by city.

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

Numbers above come from NOAA's 1991–2020 normals for Rock Island L&D 15, Il Us, 5.4 km from the city center — close enough that neighborhood microclimates (shade lines, river valleys, urban heat) matter more than station distance. See how these day counts are scored.

Davenport by the numbers

Prep checklist

  1. Wait for a rising pair: 55°F+ and climbing, first night over 50°F, 36 dry hours — in Davenport that pattern lives May through September.
  2. Run crack filler the previous afternoon — filler needs its own skin time before topcoating.
  3. Sweep to bare asphalt and kill the oil spots first — emulsion won't bond through either.
  4. Check yesterday, not just today: 24 h under 0.05" of rain. Davenport's September makes that nearly automatic at 29% 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 August morning coat gets the whole 82°F afternoon to break before dew.
  8. Keep tires off through the full cure — with August nights at 63°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 Davenport's May 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 Davenport's May (42% rain days) that lookback eats most of the calendar; September 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. September is Davenport's easiest month to find that window; May the hardest.

Can you seal a driveway in the fall?

Yes, until the nights quit. The 50°F overnight rule closes Davenport's season after September; the classic October mistake is a 62°F Saturday over a 41°F night. Spring restarts around May 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 Davenport, seal before the freeze-thaw season; January averages 13°F nights that pry open every unfilled crack. Fresh asphalt waits 6–12 months.

Best month to seal a driveway in IA?

For Davenport: August and July — August leads with 22 workable days (high 82°F, rain on 30% of days, nights 63°F). Elsewhere in IA, the state page ranks every listed city by the same math.

Other projects in Davenport

Driveway Sealing nearby

Guides

Climatology: NOAA 1991–2020 normals via ROCK ISLAND L&D 15, IL US (5.4 km from Davenport center, elevation 568 ft); live outlook by Open-Meteo.