Sunshine hours in Porto: 2,290 hours a year, month by month

Porto gets 2,290 hours of sunshine a year on average (6.3 a day). Sunniest month: July with 297 hours. Every month, measured 1991–2020.

• Porto gets 2,290 hours of sunshine a year on average, 6.3 a day – 51% of the astronomically possible. The sunniest month is July with 297 hours (9.6 a day), the dullest December with 100 (3.2 a day).
• The sunniest of 3 large cities in Portugal.
• Nearest weather station: Vigo/Peinador, 120 km away – 1991–2020 average, Deutscher Wetterdienst.

Sunshine hours month by month

• January: 109 h · 3.5 h a day · 37 %
• February: 135 h · 4.8 h a day · 45 %
• March: 178 h · 5.7 h a day · 48 %
• April: 201 h · 6.7 h a day · 50 %
• May: 237 h · 7.6 h a day · 53 %
• June: 266 h · 8.9 h a day · 59 %
• July: 297 h · 9.6 h a day · 65 %
• August: 282 h · 9.1 h a day · 66 %
• September: 218 h · 7.3 h a day · 58 %
• October: 157 h · 5.1 h a day · 46 %
• November: 110 h · 3.7 h a day · 37 %
• December: 100 h · 3.2 h a day · 35 %

Questions about sunshine hours

• How many hours of sunshine does Porto get a year? On average over 1991–2020 the sun shines in Porto for 2,290 hours a year – 6.3 hours a day and 51% of the time the sun is above the horizon.
• What is the sunniest month in Porto? July, with 297 hours of sunshine, 9.6 a day on average. The least sun comes in December: 100 hours, 3.2 a day.
• Is Porto a sunny city? Among the 3 large cities in Portugal with measurements, Porto ranks number 1.
• Where do the figures come from? From the 1991–2020 climate normals of Deutscher Wetterdienst: Germany from its own station network, the rest of the world from the CLIMAT reports of the national weather services. Porto uses the station Vigo/Peinador.
• What counts as an hour of sunshine? By the World Meteorological Organization's definition the sun is shining once its direct radiation exceeds 120 watts per square metre. Just after sunrise and before sunset it is often too weak – which is why even deserts never reach 100%.

The sunniest large cities: United Kingdom

• 1. Southend-on-Sea: 1,846 h a year
• 2. Southampton: 1,780 h a year
• 3. Norwich: 1,719 h a year
• 4. London: 1,675 h a year
• 5. Plymouth: 1,673 h a year
• 6. Bristol: 1,654 h a year
• 7. Swansea: 1,644 h a year
• 8. Sheffield: 1,631 h a year
• 9. Edinburgh: 1,575 h a year
• 10. Birmingham: 1,490 h a year

The cloudiest large cities: United Kingdom

• 1. Glasgow: 1,153 h a year
• 2. Belfast: 1,372 h a year
• 3. Aberdeen: 1,448 h a year
• 4. Leeds: 1,488 h a year

The sunniest large cities in the world

• 1. Dubai: 3,610 h a year
• 2. Victoria de Durango: 3,573 h a year
• 3. Abu Dhabi: 3,522 h a year
• 4. Hermosillo: 3,479 h a year
• 5. Kassala: 3,451 h a year
• 6. Iranshahr: 3,410 h a year
• 7. Dammam: 3,391 h a year
• 8. Gaborone: 3,388 h a year
• 9. Zahedan: 3,386 h a year
• 10. Yazd: 3,381 h a year

The cloudiest large cities in the world

• 1. Chengdu: 962 h a year
• 2. Chongqing: 985 h a year
• 3. Sukabumi: 1,082 h a year
• 4. Glasgow: 1,153 h a year
• 5. Tanjung Pinang: 1,172 h a year
• 6. Medan: 1,201 h a year
• 7. Samarinda: 1,275 h a year
• 8. Sungai Penuh: 1,311 h a year
• 9. Limerick: 1,339 h a year
• 10. Huaihua: 1,352 h a year

• Data: Deutscher Wetterdienst (DWD), sunshine duration climate normals 1991–2020, CC BY 4.0. Possible hours: time between sunrise and sunset.