Anyone planning to paint their facade or external walls this year will have noticed that the usual calendar is not working as expected. Summer has been prolonged, rainfall has been delayed, and this has a direct impact on choosing the best time to paint.
Why 2026 requires more attention to the schedule
A September out of the ordinary
September 2026 was the warmest in the last 95 years in mainland Portugal and the fifth driest since 2000, classified by IPMA as extremely hot and very dry.1 Accumulated rainfall reached just 12.7 millimetres, equivalent to only 30% of the normal value for the month. For those painting exteriors, this means that the window which traditionally separated the extreme summer heat from persistent winter rain became shorter and less predictable this year.
What to expect for the rest of autumn
The IPMA's seasonal forecasts for the following quarter also do not point to a quick return to normal. Average temperature is expected to remain above normal on the mainland during the last quarter of the year, with October, November and December warmer than normal for the season.2 For October, IPMA forecasts a positive rainfall anomaly only in the north of the country. In practice, this requires looking at each region more carefully, rather than following the generic rule that "spring or autumn are always safe".
How each region should adjust the painting window this year
Coastal and inland: different approaches
On the coast, Atlantic humidity remains the dominant factor, even with temperatures higher than normal. Inland, where heat anomalies tend to be greater, the risk becomes the opposite: paint drying too quickly, which compromises adhesion. This difference was already explored in detail in the article on how each region of the country has its own exterior painting schedule3, but it is worth emphasising that an atypical year like 2026 can shorten or shift those usual windows.
Signs to watch before scheduling the work
Instead of following only last year's calendar, it is worth observing three concrete signs before scheduling exterior painting:
- Stable 10-day forecast, with no strong rain or heat waves announced;
- Overnight temperatures above 10°C, so that paint does not suffer thermal shock during curing;
- Moderate relative humidity, avoiding both extreme dry heat and persistent coastal mist.
These three points matter more than the calendar month, especially in years with deviations like the one currently being experienced.
Comparing conditions by region this autumn
The following table summarises, in an indicative way, how current conditions tend to affect exterior painting planning in the country's main regions.
| Region | Dominant condition in 2026 | Recommended window | Main concern |
|---|---|---|---|
| Algarve and South Coast | Intense prolonged sun, drought | Late October to early December | Salt and UV radiation |
| Lisbon and Tagus Valley | Above average heat, variable humidity | October, before first heavy rains | Excessive drying on hot days |
| Porto and North Coast | Atlantic humidity, rain still uncertain | Short windows between weather fronts | Insufficient dry time for paint to cure |
| Braga and Minho | Thermal fluctuations, rain may concentrate | Isolated days of stability | Humidity and cold cycles |
| Inland (Beira, Alentejo) | Stronger heat anomalies | Mild mornings, avoid peak solar hours | Excessively rapid drying |
This comparison serves only as a starting point. The final decision should always consider the actual forecast for the days the work is scheduled, not just the regional average.
What to do in practice before scheduling the painting
For those wanting to go ahead with exterior painting still this autumn, there are simple steps that help reduce the risk of surprises:
- Check the IPMA's extended forecast for at least a full week of dry weather.
- Avoid scheduling work on days of abrupt transitions between heat and rain, which are more frequent in atypical years like this one.
- Ask the professional to assess the real state of the surfaces before closing the quote. When the quote is calculated per square metre, it is worth remembering that this value is always indicative, because two facades with the same area may have very different levels of degradation (cracks, loose rendering, accumulated humidity). The final price is only confirmed after the professional sees the real state of the surfaces, whether through photos and videos or through a site visit. This is why our platform always requests photos and videos before finalising any quote, precisely to avoid surprises during the work.
- Confirm that the scope of work is recorded in writing. On our platform, all job details go online, visible to both the client and the professional and to the platform, which avoids misunderstandings about what was actually agreed.
Those also considering painting the facade during winter4 should pay even more attention to these signs, as the margin for error tends to be smaller in the colder months. For those seeking guidance on facade painting5 adapted to the specific conditions of your area, it is worth comparing forecasts several days before fixing any date.
Frequently Asked Questions
It serves as a general reference, but should be adjusted. In years with temperature and rainfall deviations like the one currently being experienced, it is safer to look at the actual forecast for the scheduled days than to follow just the calendar month.
Yes, but with extra care. Very hot days accelerate paint drying on the surface before it adheres in depth, which can compromise the durability of the work.
Not necessarily. What matters most is identifying a window of several consecutive days without heavy rain and without extreme temperatures, regardless of the exact month in which that window occurs.
A dry summer can hide cracks or degraded rendering that only appear on close inspection. It is ideal for the professional to assess the real state of the surface before starting work.
It depends on the urgency and the current state of the facade. If there are visible signs of degradation, postponing could worsen the problem; if the surface is in good condition, waiting for a more stable window may be reasonable.
Ready to paint?
Get free quotes from verified local painters in minutes. No commitment.
Sources
External sources open in a new tab.
- Setembro bateu recordes de calor e deixou Portugal quase sem chuva - Sul Informaçãosulinformacao.pt
- Depois do 'comboio de tempestades', o que já dizem os modelos para o inverno 2026/2027?observador.pt
- Clima e pintura exterior: cada região de Portugal tem o seu calendáriopinturasportugal.pt
- Pintar fachada no Inverno: quando evitar e quando avançarpinturasportugal.pt
- Pintura de Fachadaspinturasportugal.pt
