Is it good to paint in Cincinnati, OH this week?
A live 7-day go/no-go calendar for exterior paint in Cincinnati, built from the local forecast against the 5°F-above-dew-point rule. We lead with the signal a weather app misses: overnight condensation risk.
- Dew margin
- 6.6°F
- Overnight dew
- Low
- Rain
- 29%
- Window
- 8am–5pm
Hot afternoon (89°F, ceiling 85°F) — paint early and follow the shade.
- Dew margin
- 2.8°F
- Overnight dew
- Watch
- Rain
- 76%
- Window
- —
Rain likely in the 24h cure window (76% chance, ~4.8mm) — it can wash out or mar an uncured paint.
- Dew margin
- 6.1°F
- Overnight dew
- Low
- Rain
- 2%
- Window
- 9am–5pm
Clear to paint: temps 55–70°F, RH under 75%, surface stays 6.1°F+ above the dew point, no rain in the cure window.
- Dew margin
- -1°F
- Overnight dew
- High
- Rain
- 4%
- Window
- —
High condensation risk overnight — surface dips to within -1°F of the 51°F dew point (low 48°F, 96% cloud, 5 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- Dew margin
- 5.4°F
- Overnight dew
- Low
- Rain
- 0%
- Window
- 9am–5pm
Clear to paint: temps 50–65°F, RH under 85%, surface stays 5.4°F+ above the dew point, no rain in the cure window.
- Dew margin
- 2.1°F
- Overnight dew
- Watch
- Rain
- 0%
- Window
- 11am–5pm
Watch overnight dew — surface comes within 2.1°F of the dew point (margin is 5°F). Time the coat to dry well before evening.
- Dew margin
- 0.9°F
- Overnight dew
- High
- Rain
- 2%
- Window
- —
High condensation risk overnight — surface dips to within 0.9°F of the 53°F dew point (low 54°F, 4% cloud, 4 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- Hot afternoon (89°F, ceiling 85°F) — paint early and follow the shade.
Caution. These are forecast numbers — confirm the surface temperature on-site before you start.
Why these thresholds
Overnight dew condensing on a fresh coat causes blistering, surfactant leaching and peeling — the cause of 40%+ of exterior paint failures.
- • Surface temp must stay 5°F above the dew point through application and cure (ASTM D3276 / ISO 8502-42).
- • Air + surface in the 50–85°F band (low-temp lines to 35°F).
- • Humidity under 85%; ideally under 70%.
- • No rain for 24h after application.
- • We use the forecast ground-surface temperature as a surface-temp proxy — confirm on-site with an IR thermometer.
Free in the beta
Watch this job site 24/7
Get an email the moment overnight dew, rain, or an out-of-range stretch threatens a fresh coat — and a morning digest with the best window ahead. No app to check; we watch the forecast for you.