Porto weather in March
In March, Porto has daytime highs averaging 16 °C, nights around 8.2 °C, with 10 wet days, and a sea temperature of 14 °C. Figures are 1991–2020 climate normals.
- 16.3°C Average high
- 8.2°C Average low
- 10days Wet days
- 123mm Rainfall
- 13.6°C Sea temperature
- 12h Daylight
Daily temperatures through March
How March develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 March | 15.1 °C | 7.4 °C | 35 % |
| 11–20 March | 17.1 °C | 8.2 °C | 24 % |
| 21–31 March | 16.6 °C | 8.9 °C | 38 % |
- Average highs rise from 15.1 °C early in March to 16.6 °C by the end of it.
- Rain is most likely over days 21–31 of March (38 % of days) and least likely over days 11–20 (24 %).
What to expect
| Measure | Typical March | Share of the month |
|---|---|---|
| Days above 25 °C | 0.07 of 31 | 0 % |
| Days above 30 °C | 0 of 31 | 0 % |
| Days below 0 °C | 0.07 of 31 | 0 % |
| Days with more than 1 mm rain | 10 of 31 | 33 % |
Conditions in March
| Measure | Average |
|---|---|
| Mean temperature | 12 °C |
| Record high (1991–2020) | 25 °C |
| Record low (1991–2020) | -0.8 °C |
| Relative humidity | 77 % |
| Wind speed | 19 km/h |
| Cloud cover | 55 % |
Where Porto ranks in March
| Ranking | Position | Value |
|---|---|---|
| The warmest places in Europe in March | 24th of 50 | 16 °C |
| Warmest sea temperatures in Europe in March | 28th of 50 | 14 °C |
| Best beach destinations in Europe in March | 29th of 50 | 18/100 |
| Places with the best weather in Europe in March | 33rd of 50 | 70/100 |
March compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 12.9 °C | 154 mm | 60 % |
| February | 13.9 °C | 103 mm | 55 % |
| March | 16.3 °C | 123 mm | 55 % |
| April | 17.5 °C | 123 mm | 56 % |
| May | 20.0 °C | 102 mm | 53 % |
See all twelve months for Porto
- March is the 8th warmest month here.
- It is the 8th driest month of the year.
- It ranks 7th for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 10 of 31 days — 33 % of the month.
- Nights are about 8.1 °C cooler than the middle of the day.
- The hottest March day on record since 1991 reached 25 °C, 9.1 °C above the usual daytime high.
- Beach score: 18 / 100 — see how this is calculated.
QuestionsMarch in Porto, answered
How warm is Porto in March?
Daily highs average 16 °C and nights fall to about 8.2 °C, a spread of 8.1 °C between afternoon and dawn. That makes March the 9th warmest month of the year here.
Does it rain much in Porto in March?
March averages 123 mm of rain, spread over about 10 of the 31 days — 33 % of the month. Cloud cover averages 55 % of the sky.
Is the sea warm enough to swim in March?
The sea averages 14 °C off Porto in March. Most people find water below 20 °C bracing and above 25 °C comfortable for a long swim; this figure is a monthly surface average, so a sheltered bay on a still afternoon can be warmer.
How long are the days in March?
Porto averages 12 hours between sunrise and sunset in March. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.