Bilbao weather in April
In April, Bilbao has daytime highs averaging 15 °C, nights around 9.3 °C, with 15 wet days, and a sea temperature of 13 °C. Figures are 1991–2020 climate normals.
- 15.4°C Average high
- 9.3°C Average low
- 15days Wet days
- 97mm Rainfall
- 13.4°C Sea temperature
- 13h Daylight
Daily temperatures through April
How April 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 April | 14.8 °C | 8.7 °C | 47 % |
| 11–20 April | 15.0 °C | 9.0 °C | 53 % |
| 21–30 April | 16.3 °C | 10.0 °C | 50 % |
- Average highs rise from 14.8 °C early in April to 16.3 °C by the end of it.
- Rain is most likely over days 11–20 of April (53 % of days) and least likely over days 1–10 (47 %).
What to expect
| Measure | Typical April | Share of the month |
|---|---|---|
| Days above 25 °C | 0.3 of 30 | 1 % |
| Days above 30 °C | 0 of 30 | 0 % |
| Days below 0 °C | 0 of 30 | 0 % |
| Days with more than 1 mm rain | 15 of 30 | 50 % |
Conditions in April
| Measure | Average |
|---|---|
| Mean temperature | 12 °C |
| Record high (1991–2020) | 27 °C |
| Record low (1991–2020) | 2.3 °C |
| Relative humidity | 78 % |
| Wind speed | 18 km/h |
| Cloud cover | 66 % |
Where Bilbao ranks in April
| Ranking | Position | Value |
|---|---|---|
| Warmest sea temperatures in Europe in April | 43rd of 50 | 13 °C |
April compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| February | 12.3 °C | 102 mm | 67 % |
| March | 14.1 °C | 98 mm | 64 % |
| April | 15.4 °C | 97 mm | 66 % |
| May | 18.1 °C | 86 mm | 65 % |
| June | 20.6 °C | 68 mm | 62 % |
See all twelve months for Bilbao
- April is the 7th warmest month here.
- It is the 6th driest month of the year.
- It ranks 8th for least cloud cover.
- Days last about 13 hours from sunrise to sunset.
- It rains on 15 of 30 days — 50 % of the month.
- Nights are about 6.1 °C cooler than the middle of the day.
- The hottest April day on record since 1991 reached 27 °C, 12 °C above the usual daytime high.
- Beach score: 5 / 100 — see how this is calculated.
QuestionsApril in Bilbao, answered
How warm is Bilbao in April?
Daily highs average 15 °C and nights fall to about 9.3 °C, a spread of 6.1 °C between afternoon and dawn. That makes April the 7th warmest month of the year here.
Does it rain much in Bilbao in April?
April averages 97 mm of rain, spread over about 15 of the 30 days — 50 % of the month. Cloud cover averages 66 % of the sky.
Is the sea warm enough to swim in April?
The sea averages 13 °C off Bilbao in April. 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 April?
Bilbao averages 13 hours between sunrise and sunset in April. 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.