KWELBY · EXTERIOR PAINT WEATHER

Know if the weather will hold before you paint.

Kwelby checks exterior paint weather against a sourced product rule. Enter a United States street address and it reads the National Weather Service hourly forecast, then tells you in plain language whether the temperature, dew point, and rain window give the paint time to go on and set. Free for homeowners, with saved job decisions and client updates for painting crews.

Check your address free · How Kwelby works · For painting businesses

What the check looks at

• The air temperature through the work hours and the coldest hour afterwards.
• The gap between temperature and dew point, where moisture can settle on a wall.
• The chance of rain before a fresh coat has time to set.

Why not just a weather app?

A consumer forecast answers “will it rain?”. A coating asks four narrower questions: is the air warm enough right through the work block, is there enough clearance above the dew point, does the coat get its dry hours before the next shower, and does the temperature hold afterwards. Kwelby reads those four against the thresholds printed on a named product data sheet, at a street address rather than a city, and shows you the sheet it used. It does not invent a universal painting temperature or drying time.

Exterior paint weather guides

• Should an Astoria crew topcoat primed galvanized railings before September rain?
• Can washed pressure-treated deck rails take SuperDeck solid stain after morning dew?
• Can a northern Minnesota crew paint fiber-cement lap siding after morning frost?
• When is washed, chalking aluminum siding ready for a Duration Satin repaint?
• Should a North Oregon coast crew coat cedar trim after morning fog?
• When can an HOA approve a Loxon XP repaint on a rain-soaked CMU breezeway?
• What is the best time of year to paint a house exterior?
• Is it too hot to paint outside?
• Can you paint outside when it’s humid?
• How to read a weather forecast before painting your house
• How long after rain can you paint outside?
• What temperature is too cold to paint outside?
• Dew point and exterior paint: the homeowner’s guide
• Can exterior paint dry overnight?

Common questions

Can I paint outside today?

It depends on the coating in your hand, not on a universal rule. The label sets a minimum air temperature, a dew-point clearance, and the number of dry hours the coat needs before rain. Kwelby checks the hourly forecast at your street address against those numbers and tells you which of them the day misses. You still confirm the surface itself is dry and warm enough before you start. How to read a forecast before painting →

What temperature is too cold to paint outside?

The product sets the floor, and many exterior acrylics stop somewhere between 35°F and 50°F. What catches people out is the overnight low after application rather than the daytime high, because the coat is still forming a film for hours after the crew leaves. What temperature is too cold to paint →

How long after rain can you paint outside?

There is no fixed wait. A south-facing clapboard in a breeze can be ready in hours; a shaded north wall or porous masonry can hold water for days. Check the surface for dryness, then confirm the forecast still gives the coat its full dry window before the next shower. How long to wait after rain →

Is Kwelby free?

The address checker is free and needs no account. A free workspace holds 10 active jobs, 3 saved coating rule sets, 14-day client links, and 60 saved decisions, and it does not expire. Paid pilots at $19, $49 and $99 are one-time 30-day purchases that raise those limits and add crew sign-ins. See what each plan raises →

Where does Kwelby get its forecast?

From the United States National Weather Service hourly forecast. Your street address is resolved to a latitude and longitude, then to an NWS grid point, so two jobs in one town can return different answers. A forecast describes an area over time; it is not a measurement of your wall. How Kwelby works →

Forecasts describe an area, not a particular wall. Always follow the current coating instructions and check the surface on site.