Is it good to paint in Rochester, MN this week?
A live 7-day go/no-go calendar for exterior paint in Rochester, 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
- 2.8°F
- Overnight dew
- High
- Rain
- 77%
- Window
- —
High condensation risk overnight — surface dips to within 2.8°F of the 71°F dew point (low 74°F, 1% cloud, 5 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- Dew margin
- -1.1°F
- Overnight dew
- High
- Rain
- 32%
- Window
- —
High condensation risk overnight — surface dips to within -1.1°F of the 73°F dew point (low 72°F, 100% cloud, 7 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- Dew margin
- -0.1°F
- Overnight dew
- High
- Rain
- 33%
- Window
- —
High condensation risk overnight — surface dips to within -0.1°F of the 74°F dew point (low 74°F, 11% cloud, 16 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- Dew margin
- 0.3°F
- Overnight dew
- High
- Rain
- 54%
- Window
- —
High condensation risk overnight — surface dips to within 0.3°F of the 74°F dew point (low 73°F, 100% cloud, 18 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- Dew margin
- -1.3°F
- Overnight dew
- High
- Rain
- 53%
- Window
- —
High condensation risk overnight — surface dips to within -1.3°F of the 74°F dew point (low 73°F, 0% cloud, 12 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- Dew margin
- -2.8°F
- Overnight dew
- High
- Rain
- 38%
- Window
- —
High condensation risk overnight — surface dips to within -2.8°F of the 73°F dew point (low 70°F, 100% cloud, 9 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- Dew margin
- -1.2°F
- Overnight dew
- High
- Rain
- 35%
- Window
- —
High condensation risk overnight — surface dips to within -1.2°F of the 75°F dew point (low 73°F, 96% cloud, 15 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- High condensation risk overnight — surface dips to within 2.8°F of the 71°F dew point (low 74°F, 1% cloud, 5 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- Rain likely in the 24h cure window (77% chance, ~6.1mm) — it can wash out or mar an uncured paint.
- High humidity (92%, over the 85% mark) slows drying — keep an eye on the cure window.
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.
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.