CIS barometer
CIS poll of May 18, 2026
In the CIS poll (fieldwork May 4, 2026 to May 18, 2026, 4,016 interviews), the list with the most votes is PSOE, on 36.2 % of the vote. Next comes PP, on 24.9 %. Compared with this pollster's previous poll (April 10, 2026), PSOE moved by −0.2 points. In our average that day, PSOE stood at 28.0 %.
- Pollster
- CIS
- Commissioned by
- n/a
- Fieldwork
- 4-18 May
- Sample
- 4,016
CIS barometers and their re-estimates are not part of our average: they are shown separately.
Estimate by party
| Party | Vote | Vs. previous | Vs. average |
|---|---|---|---|
| PSOE | 36.2 % | −0.2 | +8.2 |
| PP | 24.9 % | +1.3 | −7.0 |
| Vox | 16.2 % | +1.5 | −1.6 |
| Sumar | 5.7 % | −0.1 | −0.5 |
| ERC | 2.6 % | −0.3 | +0.8 |
| Podemos | 2.5 % | +0.3 | −0.9 |
| SALF | 2.4 % | +0.7 | +0.3 |
| EH Bildu | 0.9 % | −0.4 | −0.4 |
| Junts | 0.8 % | 0.0 | −0.6 |
| BNG | 0.7 % | −0.1 | −0.2 |
| PNV | 0.5 % | −0.3 | −0.7 |
| CC | 0.1 % | −0.1 | −0.3 |
| UPN | 0.1 % | 0.0 | −0.1 |
Vs. previous: change in points from the same pollster's poll of April 10, 2026. Vs. average: difference from our weighted average of May 18, 2026.
Figures from the poll table on Wikipedia (CC BY-SA 4.0). Original publication: CIS.
How to cite: Su Momento, “CIS poll of May 18, 2026”, May 18, 2026, https://sumomento.com/en/encuestas/cis-2026-05-18