Is it good to paint in Boulder, CO this week?
A live 7-day go/no-go calendar for exterior paint in Boulder, 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
- 27.5°F
- Overnight dew
- Low
- Rain
- 0%
- Window
- —
Too hot — high of 90°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 38.7°F
- Overnight dew
- Low
- Rain
- 0%
- Window
- 8am–5pm
Clear to paint: temps 69–85°F, RH under 24%, surface stays 38.7°F+ above the dew point, no rain in the cure window.
- Dew margin
- 38.9°F
- Overnight dew
- Low
- Rain
- 22%
- Window
- —
Too hot — high of 92°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 36.2°F
- Overnight dew
- Low
- Rain
- 13%
- Window
- —
Too hot — high of 91°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 31.6°F
- Overnight dew
- Low
- Rain
- 7%
- Window
- —
Too hot — high of 92°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 45.1°F
- Overnight dew
- Low
- Rain
- 3%
- Window
- —
Too hot — high of 96°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 38.7°F
- Overnight dew
- Low
- Rain
- 9%
- Window
- —
Too hot — high of 96°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
- Too hot — high of 90°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
Hold off. 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.
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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.