Is it good to stain in Hilo, HI this week?
A live 7-day go/no-go calendar for deck & fence stain in Hilo, 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
- 85%
- Window
- —
High condensation risk overnight — surface dips to within 0.1°F of the 71°F dew point (low 71°F, 84% cloud, 5 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Dew margin
- 0.7°F
- Overnight dew
- High
- Rain
- 63%
- Window
- —
High condensation risk overnight — surface dips to within 0.7°F of the 70°F dew point (low 71°F, 100% cloud, 6 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Dew margin
- -0.2°F
- Overnight dew
- High
- Rain
- 100%
- Window
- —
High condensation risk overnight — surface dips to within -0.2°F of the 74°F dew point (low 74°F, 100% cloud, 2 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Dew margin
- 0°F
- Overnight dew
- High
- Rain
- 98%
- Window
- —
High condensation risk overnight — surface dips to within 0°F of the 74°F dew point (low 69°F, 100% cloud, 7 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Dew margin
- 0.1°F
- Overnight dew
- High
- Rain
- 67%
- Window
- —
High condensation risk overnight — surface dips to within 0.1°F of the 74°F dew point (low 74°F, 100% cloud, 5 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Dew margin
- 1.8°F
- Overnight dew
- High
- Rain
- 73%
- Window
- —
High condensation risk overnight — surface dips to within 1.8°F of the 68°F dew point (low 69°F, 42% cloud, 6 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Dew margin
- 4.1°F
- Overnight dew
- Watch
- Rain
- 71%
- Window
- —
Rain likely in the 24h cure window (71% chance) — it can wash out or mar an uncured stain.
- High condensation risk overnight — surface dips to within 0.1°F of the 71°F dew point (low 71°F, 84% cloud, 5 mph wind). A fresh stain can blush/blister. Stop 4h before dew falls.
- Rain likely in the 24h cure window (85% chance, ~2.1mm) — it can wash out or mar an uncured stain.
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.