Is it good to coat in Tempe, AZ this week?
A live 7-day go/no-go calendar for epoxy & resin floors in Tempe, 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°F
- Overnight dew
- High
- Rain
- 52%
- Window
- —
High condensation risk overnight — surface dips to within 3°F of the 61°F dew point (low 63°F, 0% cloud, 5 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 4.9°F
- Overnight dew
- High
- Rain
- 3%
- Window
- —
High condensation risk overnight — surface dips to within 4.9°F of the 59°F dew point (low 64°F, 0% cloud, 3 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- Dew margin
- 20°F
- Overnight dew
- Low
- Rain
- 0%
- Window
- —
Too hot — high of 93°F is well over the 86°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 21.5°F
- Overnight dew
- Low
- Rain
- 0%
- Window
- —
Too hot — high of 96°F is well over the 86°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 22.2°F
- Overnight dew
- Low
- Rain
- 0%
- Window
- —
Too hot — high of 95°F is well over the 86°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 19.3°F
- Overnight dew
- Low
- Rain
- 0%
- Window
- —
Too hot — high of 96°F is well over the 86°F ceiling; the film skins over before it can level or adhere.
- Dew margin
- 22.6°F
- Overnight dew
- Low
- Rain
- 1%
- Window
- —
Too hot — high of 97°F is well over the 86°F ceiling; the film skins over before it can level or adhere.
- High condensation risk overnight — surface dips to within 3°F of the 61°F dew point (low 63°F, 0% cloud, 5 mph wind). A fresh coat can blush/blister. Stop 4h before dew falls.
- High humidity (93%, over the 85% mark) slows drying — keep an eye on the cure window.
- Some rain risk (52%) during the cure window — re-check the radar before you start.
Hold off. These are forecast numbers — confirm the surface temperature on-site before you start.
Why these thresholds
Installing within 5°F of the dew point causes amine blush / carbamation — a cloudy, greasy, hazed floor. The slab surface temp, not the air, is what counts.
- • Surface temp must stay 5°F above the dew point through application and cure (ASTM D3276 / ISO 8502-42).
- • Air + surface in the 50–86°F band (low-temp lines to 50°F).
- • Humidity under 85%; ideally under 80%.
- • 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.