Is it good to stain in Naperville, IL this week?
A live 7-day go/no-go calendar for deck & fence stain in Naperville, 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
- -0.1°F
- Overnight dew
- High
- Rain
- 57%
- Window
- —
High condensation risk overnight — surface dips to within -0.1°F of the 70°F dew point (low 69°F, 63% cloud, 7 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Dew margin
- 0.3°F
- Overnight dew
- High
- Rain
- 71%
- Window
- —
High condensation risk overnight — surface dips to within 0.3°F of the 72°F dew point (low 72°F, 100% cloud, 6 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Dew margin
- 1.2°F
- Overnight dew
- High
- Rain
- 68%
- Window
- —
High condensation risk overnight — surface dips to within 1.2°F of the 70°F dew point (low 71°F, 12% cloud, 5 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Dew margin
- -0.1°F
- Overnight dew
- High
- Rain
- 41%
- Window
- —
High condensation risk overnight — surface dips to within -0.1°F of the 71°F dew point (low 65°F, 20% cloud, 8 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Dew margin
- 7.2°F
- Overnight dew
- Low
- Rain
- 7%
- Window
- 8am–5pm
Clear to stain: temps 68–77°F, RH under 80%, surface stays 7.2°F+ above the dew point, no rain in the cure window.
- Dew margin
- 1.2°F
- Overnight dew
- High
- Rain
- 26%
- Window
- —
High condensation risk overnight — surface dips to within 1.2°F of the 64°F dew point (low 65°F, 100% cloud, 5 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Dew margin
- 7.2°F
- Overnight dew
- Low
- Rain
- 33%
- Window
- 9am–5pm
High humidity (90%, over the 85% mark) slows drying — keep an eye on the cure window.
- High condensation risk overnight — surface dips to within -0.1°F of the 70°F dew point (low 69°F, 63% cloud, 7 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Rain likely in the 24h cure window (57% chance, ~2.6mm) — it can wash out or mar an uncured stain.
- High humidity (94%, 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
Stain applied to a damp or dew-wet board can't penetrate — it beads, stays tacky and flakes. Wood must be dry and stay above the dew point while it sets.
- • Surface temp must stay 5°F above the dew point through application and cure (ASTM D3276 / ISO 8502-42).
- • Air + surface in the 50–90°F band (low-temp lines to 45°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.