One Tampa Bay forecast cannot tell you whether both the shaded north wall and the sunlit west wall are ready for paint. Record surface conditions where work will happen, and compare them with the instructions for the exact coating—not a remembered temperature rule.
Two walls, one air reading, different results
Benjamin Moore’s temperature guidance distinguishes air from surface temperature and notes that sun can heat a surface beyond the surrounding air. LSL constructed this example to show the consequence for a weather log.
These inputs are hypothetical, not measurements from a Tampa house or a forecast. Assume both observations are taken at the same time, with air temperature 84°F and dew point 76°F:
| Location | Surface temperature | Surface minus dew point |
|---|---|---|
| West wall in sun | 94°F | 94 − 76 = 18°F |
| North wall in shade | 78°F | 78 − 76 = 2°F |
Using air temperature in both rows would give 84 − 76 = 8°F and hide the difference. The warmer wall has more separation from the dew point, but may present a different problem if its temperature exceeds the selected product’s limit. Neither row is an application approval.
Record the instrument or method and the time with the surface reading. A forecast dew point and an on-site observation are different inputs; label which was used. Compare the resulting spread and all other required conditions with the product documents. Do not apply one manufacturer’s general advice as a universal pass mark.
Turn “weather permitting” into a usable record
Before work, identify the primer and topcoat, substrate, coat number and current label/data-sheet revision. Ask the applicator which temperature, moisture, humidity, rain/dew and recoat conditions govern each coat.
The A Able Painting Company weather-window log offers a useful published method: repeat observations by elevation and work period. LSL’s compact record below keeps the location and timing attached to each decision.
| Record field | Entry to preserve |
|---|---|
| Wall and time | Named elevation or component; sun/shade; observation time; matching photo |
| Weather source | Forecast provider and issue time, plus any on-site observations; distinguish predicted from measured values |
| Surface | Temperature, visible moisture, recent rain/washing and the instrument or observation method |
| Product comparison | Exact document, applicable conditions, result and responsible applicator’s decision |
| Work performed | Start/stop time, coat and boundary completed; identify unfinished areas |
| Subsequent exposure | Required protection period; observed rain, dew or other wetting; follow-up time and action |
Use another row when the work moves to a different elevation or conditions change. “Whole exterior, morning” is too broad to explain an afternoon decision on a different wall.
Application and protection are separate clocks
Sherwin-Williams’ exterior application FAQ discusses both conditions while applying paint and weather after application. Its examples vary by product and exposure; they are not a single rain-free or temperature rule for every coating.
Ask for the start event and length of each applicable interval: application, earliest recoat, protection from moisture and cure. Dry to the touch is not shorthand for all four. If rain or condensation interrupts the planned window, preserve the affected area, time and photos and get the applicator’s written response or manufacturer guidance before treating the work as accepted.
Keep this record with the product documents and final scope. It can explain what informed a decision; it cannot prove adhesion or guarantee performance.
What Tampa’s climate adds—and what it cannot tell you
The NWS Tampa climate table gives a 1991–2020 annual precipitation normal of 49.48 inches, with each June-through-September monthly normal above six inches. That supports planning for interruptions and repeat observations. It cannot establish that a particular wall is dry today.
Persistent peeling or dampness belongs in a separate stucco and moisture investigation, not a weather-log “pass.”
How the example was checked
LSL rechecked the company’s published log, both manufacturer pages and the NWS table on September 13, 2026. We chose the illustrative temperatures and reproduced the subtractions; none represents field testing. The source log explains a documentation method, while manufacturer instructions control actual product use. No property was visited and no coating window was approved.