Porto in December
In December, Porto has 150.9 mm (5.94 in) of rain, a daily high of 14.7 °C (58.5 °F) and a daily low of 7.5 °C (45.5 °F), as 1991-2020 model estimates; figures in brackets are converted. The daily high is a model estimate, adjusted against station records.
Last updated : first sourced version.
Best time to visit Porto: December misses our rule: days are 1.3 °C under our 16 °C, nights are 0.5 °C under our 8 °C and rain is 0.9 mm over our 150 mm (model estimates). Expect 10.6 rain days (model estimate) and days that shorten by 10 min.
What December is like in Porto
- At the start of December, the city's Christmas tree lights up on Avenida dos Aliados. Fireworks mark the moment. Source: Câmara Municipal do Porto (Porto city council), checked .
- Through December, a tram dressed up for Christmas runs on the line from Infante to Passeio Alegre. Source: Câmara Municipal do Porto (Porto city council), checked .
- On 8 December, a public holiday, runners race the Volta a Paranhos, a ten-kilometre road race. It starts and ends on Rua de Alfredo Allen. Source: Câmara Municipal do Porto (Porto city council), checked .
Key figures
Weather in December, 1991-2020 model estimates
- Daily high
- 14.7 °C (58.5 °F)
- Daily low
- 7.5 °C (45.5 °F)
- Rain
- 150.9 mm (5.94 in) in the month
- Sunshine
- no data
Model estimate 1991-2020, not a weather station: ERA5-Land model estimates (Copernicus), computed by City by Month for the grid cell nearest the city. Daily high and Days with rain: model estimate, adjusted against station records. Licence: CC BY 4.0. Checked . How we make and test model estimates
Model estimate for the ERA5-Land grid cell at 41.1° N, 8.6° W, 6 km from the city centre point.
How we define and convert these figures
Notes. Sunshine: Not in our ERA5-Land estimates.
Daylight on 15 December 2026
- Sunrise
- 07:53 local time
- Sunset
- 17:06 local time
- Day length
- 9 h 14 min
Day length 1-31 December: 9 h 26 min to 9 h 16 min, -10 min.
Source: NOAA Solar Calculator equations, checked .
Month by month
Each month: daily high in °C, then rain in mm, 1991-2020 model estimates.
ERA5-Land model estimates 1991-2020, as above, checked .
This month against the year
| Measure | December | Rank |
|---|---|---|
| Daily high | 14.7 °C | 2nd coldest |
| Daily low | 7.5 °C | 3rd coldest |
| Rain | 150.9 mm | 3rd wettest |
| Sunshine | no data | no data |
| Day length | 9 h 14 min | shortest |
Equal values share a rank. How we rank months
Porto in December, on average: 10.6 rain days (1 mm or more). Model estimate, adjusted against station records.
ERA5-Land model estimates 1991-2020, as above, checked .
Day length: NOAA solar equations, checked .
Public holidays this month
| Date | Holiday |
|---|---|
| Tuesday | Restoration of Independence Day |
| Tuesday | Immaculate Conception |
| Friday | Christmas Day |
Typed from the official list and re-checked, .
December 2027: no data. No official page gives the 2027 Easter and Corpus Christi dates yet.
English names are from the holidays library where the official list gives none. How we check holidays
Source: Official public holiday list (dgaj.justica.gov.pt), checked ; holidays Python library, checked . Library: holidays 0.105.
Same month in 8 model-estimate cities
Porto is warmer than 1 of our 8 model-estimate cities in December by mean daily high. How we rank cities
Closest high and low in December: Lisbon (2.1 °C apart), Istanbul (2.6), Delhi (5.2).
| City | Gap from Porto, °C | High, °C | Low, °C | Rain, mm | Sunshine, hours |
|---|---|---|---|---|---|
| Porto (this page) | — | 14.7 | 7.5 | 150.9 | no data |
| Lisbon (closest) | 2.1 | 15.8 | 10.5 | 77.9 | no data |
| Istanbul (closest) | 2.6 | 11.1 | 6.0 | 99.3 | no data |
| Delhi (closest) | 5.2 | 23.2 | 9.3 | no data | no data |
| Melbourne | 7.6 | 24.4 | 12.9 | 64.0 | no data |
| Sydney | 10.8 | 25.6 | 18.1 | 62.5 | no data |
| Mumbai | 14.7 | 31.4 | 20.2 | no data | no data |
| Bangkok | 15.7 | 31.6 | 21.9 | no data | no data |
Sources (1991-2020): ERA5-Land model estimates, checked . Each city's page names its grid cell. All sources in full on Methodology.
Sources
- Attribution: Copernicus Climate Change Service (2025): ERA5 Land hourly time-series data from 1950 to present. Copernicus Climate Change Service (C3S) Climate Data Store (CDS). DOI: 10.24381/ee82e357. Accessed on the check date shown. Generated using or contains modified Copernicus Climate Change Service information 2025. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains. Licence: CC BY 4.0. Checked .
- NOAA Solar Calculator equations, computed locally, NOAA Global Monitoring Laboratory (method); City by Month (computation). Attribution: Computed with the NOAA Solar Calculator method (no NOAA endorsement implied). Licence: Method, not data. Checked .
- holidays Python library, run locally. Attribution: holidays library, Vacanza team. Licence: MIT. Checked .
Official sources
Cite this page: City by Month. "Porto in December: weather, daylight, holidays". https://citybymonth.com/cities/portugal/porto/december/. Last updated 8 November 2026.