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 Eastern Kentucky crew repaint an opening Kleer PVC fascia joint before Sunday’s frost?
• Should a repaint estimator coat the weep-screed joint on a three-coat stucco wall?
• Should a Taos repaint estimator disturb suspected asbestos-cement shingles before Thursday’s freeze?
• Does EPA’s 20-square-foot exception apply per side on a pre-1978 wood-fascia repaint?
• Should an Albuquerque crew clearcoat a mahogany entry door before Thursday’s canyon winds?
• Should a repaint estimator coat LP SmartSide lap siding when its patio clearance is short?
• Should a Redding crew oil-stain redwood fence caps after the October wind warning?
• Should a property manager touch up a PVDF metal roof scratch after rain or replace the panel?
• Can a Eugene crew prime bare wood window sills after October frost?
• Should an estimator paint over an open AZEK fascia scarf joint after cold rain?
• Should a Jacksonville HOA touch up aluminum railing scratches after coastal flooding?
• Should an estimator caulk a HardieTrim roof-to-wall gap before repainting?
• Should a Florence crew recoat an EIFS window head before weekend rain?
• Should a repaint estimator coat over brick-veneer weep holes after rain?
• Can a Eugene crew prime peeling galvanized downspout elbows after October fog?
• Should a repaint estimator caulk open ColorPlus lap-siding butt joints after rain?
• Can Springfield crews finish LP SmartSide lap siding before tonight’s frost?
• When can a rain-wet wood garage door bottom rail be repainted?
• Can an Ottumwa HOA coat a concrete entry ramp after October river fog?
• When can a new primed BILCO cellar door take alkyd enamel after dew?
• Can a Raleigh crew repair a wood porch column base with epoxy after October rain?
• When can a washed Therma-Tru Fiber-Classic doorlite frame be primed after dew?
• Can a Baltimore crew coat rusty steel window lintels after October rain?
• Should an HOA repaint a brick garden wall when white salts return after rain?
• Should a La Jolla crew coat a sunlit stucco wall during the October heat warning?
• When can sprinkler-wet cedar fence picket bottoms take solid-color stain?
• Can a Waterloo crew prime a plywood siding cut edge after October rain?
• How should a crew repair rusty nail heads on a painted soffit after dew?
• Should Absecon crews paint VERSATEX PVC trim after September coastal fog?
• Why do white cedar shutters bleed brown after dew, and when can they be primed?
• Can Bangor crews reglaze wood window sash when September rain clears?
• Why does a repainted steel garage door stick to its vinyl weatherstrip?
• Can Portland crews repaint wood porch steps before rain gives way to fog?
• Should an HOA coat a hairline-cracked stucco parapet below a leaking cap?
• Should a Manhattan crew airless-spray steel balcony rails during September gusts?
• Can a repaint foreman prime fresh brick-pier mortar after seven cool, rainy days?
• Should a Phoenix repaint crew caulk stucco trim with SherMax before September rain?
• Can a repaint estimator approve darker Duration on south-facing vinyl siding?
• 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.