Is it good to paint in St. Petersburg, FL this week?
A live 7-day go/no-go calendar for exterior paint in St. Petersburg, 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
- 3.4°F
- Overnight dew
- High
- Rain
- 19%
- Window
- —
High condensation risk overnight — surface dips to within 3.4°F of the 74°F dew point (low 77°F, 0% cloud, 4 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- Dew margin
- 5.2°F
- Overnight dew
- Low
- Rain
- 12%
- Window
- —
Too hot — high of 94°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 7.7°F
- Overnight dew
- Low
- Rain
- 41%
- Window
- —
Too hot — high of 94°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 6.3°F
- Overnight dew
- Low
- Rain
- 58%
- Window
- —
Too hot — high of 93°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 8.4°F
- Overnight dew
- Low
- Rain
- 36%
- 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
- 8.3°F
- Overnight dew
- Low
- Rain
- 37%
- 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
- 9.8°F
- Overnight dew
- Low
- Rain
- 46%
- Window
- —
Too hot — high of 93°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
- High condensation risk overnight — surface dips to within 3.4°F of the 74°F dew point (low 77°F, 0% cloud, 4 mph wind). A fresh paint can blush/blister. Stop 4h before dew falls.
- Too hot — high of 94°F is well over the 85°F ceiling; the film skins over before it can level or adhere.
- Rain likely in the 24h cure window (19% chance, ~18.7mm) — 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.
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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.