Tomorrow's Weather Forecast - Porto

Tomorrow's weather in Porto. high 31°C (88°F), low 17°C (63°F). Foggy.

Tomorrow’s Outlook

Tomorrow will be 5°C warmer than today. A warm, sunny day is expected, with rain chances staying low throughout. Humidity sits at a moderate 67%, so the air shouldn't feel unusually damp or dry. Winds stay light and calm, rarely topping 10 km/h. Sunrise is at 7:11 AM and sunset at 7:48 PM, for about 12h 37m of daylight.

Tomorrow
31°/ 17°
Today26° / 15°

Tomorrow’s Hourly Weather Outlook

Morning6 AM – Noon21°
Rain probability
0%
Wind speed
10 km/h
AfternoonNoon – 6 PM29°
Rain probability
0%
Wind speed
9 km/h
Evening6 PM – Midn24°
Rain probability
0%
Wind speed
8 km/h
NightMidn – 6 AM19°
Rain probability
0%
Wind speed
6 km/h

24-Hour Rain & Temperature Forecast

Tomorrow12 Sep
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Temperature · peaks at +31°C

Planning Advice for Tomorrow

Clothing
Light layers work well; a jacket for the evening.
Outdoor
Good conditions for outdoor activities.
Travel
Standard travel conditions expected.

Sunrise & Sunset

Sunrise
Dawn 6:41 AM
Total Daylight
Full day forecastSolar noon 1:30 PM
Sunset
Dusk 8:18 PM
vs today-3 min daylight
Sunrise shift1 min later
Sunset shift2 min earlier

5-Day Weather Forecast

Full 15-Day Forecast
Today11 Sep
Foggy
26°/ 15°
2–11
Wind
Tomorrow12 Sep
Foggy
31°/ 17°
3–10
Wind
Sun13 Sep
Foggy
31°/ 18°
1–7
Wind
Mon14 Sep
Foggy
28°/ 17°
2–8
Wind
Tue15 Sep
Foggy
21°/ 16°
1–8
Wind

Weather Insight

Porto is forecast to reach a high of 31°C tomorrow, with an overnight low around 17°C. That's 7° above the long-term average high of 24°C for this time of year. Expect little chance of rain (0% probability) and a gentle breeze averaging 10 km/h. Air quality is currently Moderate (AQI 53), driven mainly by PM2.5 at 8.2 μg/m³.

Today vs Normal

26°C+2° above normal

The long-term average high for today is 24°C.

7 of the last 19 days with published data ran above normal.

That's a break from the pattern - today's forecast runs above normal even though the recent stretch mostly ran below.

2026-08-19: 24°C24°2026-08-20: 22°C22°2026-08-21: 23°C23°2026-08-22: 23°C23°2026-08-23: 25°C25°2026-08-24: 21°C21°2026-08-25: 22°C22°2026-08-26: 21°C21°2026-08-27: 19°C19°2026-08-28: 22°C22°2026-08-29: 23°C23°2026-08-30: 22°C22°

Red = above normal, blue = at or below · last 12 days

Air Quality

Air Quality
Moderate

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.