Best days to seal a driveway in St. Louis, MO this week
Here's the next 7 days for sealcoating a driveway in St. Louis, checked hour by hour against the published thresholds. Below it: what St. Louis's 1991–2020 climate averages say about the months that usually work.
This week in St. Louis
Asking the sky…
Fairsky is not a substitute for official warnings. For warnings, go to weather.gov. Verdicts are guidance, not guarantees. Your product's label always wins.
When sealcoating a driveway usually works in St. Louis
- On 1991–2020 averages, St. Louis has normal highs of 55°F or warmer with normal lows of 50°F or warmer, the temperatures driveway sealer needs day and night, in May–September.
- Of those months, September averages the fewest days with 0.10" or more of rain (4.3), which matters because sealer needs about 36 rain-free hours to cure.
- In March–April and October–November, afternoons are warm enough but normal lows drop below 50°F, so the sealer may not cure overnight.
| Month | Avg high | Avg low | Days ≥0.10" rain | Highs 55–95°F, lows 50°F+ |
|---|---|---|---|---|
| January | 40° | 24° | 4.3 | – |
| February | 46° | 28° | 4.4 | – |
| March | 56° | 36° | 6.4 | – |
| April | 68° | 46° | 7.3 | – |
| May | 77° | 57° | 8.6 | Yes |
| June | 86° | 65° | 6.5 | Yes |
| July | 89° | 69° | 6.0 | Yes |
| August | 88° | 66° | 4.9 | Yes |
| September | 81° | 57° | 4.3 | Yes |
| October | 69° | 46° | 5.4 | – |
| November | 55° | 36° | 5.3 | – |
| December | 44° | 29° | 5.2 | – |
Station: Cahokia St Louis Airport (NOAA NCEI USW00003960), about 7 km from central St. Louis. “Rain days” count days with 0.10" or more of precipitation. “Highs 55–95°F, lows 50°F+” checks the monthly averages only; any given week can be warmer, colder or wetter.
The rules we check
- Needs 3 hours in a row of daylight.
- Air at least 55°F (50–54°F is borderline).
- No hotter than 95°F. (Fairsky default: no source gave a number)
- Rain chance at or below 10%. (Fairsky default: no source gave a number)
- No rain in the 12 hours before, so surfaces are dry. (Fairsky default: no source gave a number)
- No rain for 36 hours after you finish.
- The first night's low stays at 50°F or warmer.
Your product's label always wins. Labels differ by product; in the app you can enter your label's temperature range and rain-free hours, and the verdict uses them instead.
Sources: SealMaster sealcoating FAQ
More home and yard jobs in St. Louis
- Stain a deckDeck and fence stain: 50–90°F, dry wood, 24 rain-free hours after.
- Paint a house exteriorExterior latex paint: 40°F and up, 5°F above the dew point, 4 dry hours after.
- Pour concreteConcrete: 40–85°F, no rain for 24 hours, no freezing for 48.
- Spray weedsWeed killer: 3–10 mph wind, 45–85°F, 4 rain-free hours after.
- Apply pre-emergentCrabgrass pre-emergent: before soil holds 55°F (about 200 GDD), then water it in.
- Plant grass seedCool-season grass seed: soil about 50–65°F, highs 60–80°F, no washout rain.
- Cover plants for frostFrost watch: cover at 34°F, or 36°F on clear, calm nights; 28°F is a hard freeze.
The app covers 47 activities in all, from mowing to a round of golf: see every activity and its rules.
Seal a driveway in nearby cities
- Indianapolis, IN230 miles away
- Kansas City, MO238 miles away
- Memphis, TN240 miles away
- Louisville, KY242 miles away
- Nashville, TN253 miles away
- Chicago, IL262 miles away
All seal a driveway cities: Seal a driveway, by city · Home and yard in Missouri
Questions
What's the best month to seal a driveway in St. Louis?
On 1991–2020 averages, September usually fits best in St. Louis. Any given week can still be wrong for it, which is what the live verdict above is for.
How is this verdict made?
We take the National Weather Service hourly forecast for St. Louis and check each hour against the thresholds listed above. The result is guidance, not a guarantee; your product's label always wins.
When can I seal my driveway in St. Louis?
Most sealcoat asks for 50–55°F and rising, a warm night after, and 24–36 rain-free hours. The verdict above looks for that stretch in St. Louis.
Fairsky is not a substitute for official warnings. For warnings, go to weather.gov.
Live forecasts: National Weather Service / NOAA (public domain), fetched by your browser. Climate averages: NOAA NCEI U.S. Climate Normals, 1991–2020 (public domain). Activity thresholds: product data sheets, ACI and university extension guidance, linked on each page; your product’s label wins.