Guernica weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: August
What is the weather like in Guernica in September?
In September, Guernica is mild: daytime highs average 21 °C, and nights cool down to about 17 °C. The sea averages 21.1 °C – refreshing for a swim. Expect around 5 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 73 mm in total. All in all, September is a so-so month for a holiday in Guernica.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 54 | 40 | 15 |
| Day | 22° | 21° | 19° |
| Night | 18° | 17° | 15° |
| Sea | 22° | 21° | 19° |
| Sun | 6 h | 5 h | 4 h |
| Rain days | 11 | 12 | 13 |
More details for September
- Daylight
- 12 h 34 min07:49 – 20:23
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 3 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 58 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Madrid
How the score comes together
- Temperatureweight 35 %27 %
- Seaweight 25 %59 %
- Sunshineweight 20 %37 %
- Few rainy daysweight 20 %46 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Rain jacket or umbrella
Guernica in September: quick answers
Is Guernica hot in September?
No. In September, Guernica is mild: daytime highs average 21 °C and nights drop to about 17 °C.
Can you swim in Guernica in September?
Yes. In September the sea averages 21.1 °C – refreshing for a swim.
Does it rain much in Guernica in September?
Rain is frequent, with about 12 rainy days and 73 mm in total.
Guernica month by month
The whole year in GuernicaAll destinations: SpainWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences