CIS barometer
CIS (Ateneo del Dato) poll of September 4, 2026
In the CIS (Ateneo del Dato) poll (fieldwork September 1, 2026 to September 4, 2026, 4,042 interviews), the list with the most votes is PP, on 29.5 % of the vote and 127 seats. Next comes PSOE, on 27.6 % and 112 seats. Compared with this pollster's previous poll (July 6, 2026), PP moved by −1.0 points. In our average that day, PP stood at 32.2 %.
- Pollster
- CIS (Ateneo del Dato)
- Commissioned by
- n/a
- Fieldwork
- 1-4 Sep
- Sample
- 4,042
CIS barometers and their re-estimates are not part of our average: they are shown separately.
Estimate by party
| Party | Vote | Seats | Vs. previous | Vs. average |
|---|---|---|---|---|
| PP | 29.5 % | 127(−8) | −1.0 | −2.7 |
| PSOE | 27.6 % | 112(−2) | −0.3 | +1.2 |
| Vox | 17.6 % | 65(+11) | +1.4 | −0.9 |
| Sumar | 6.8 % | 12(−2) | −0.6 | +0.7 |
| Podemos | 3.9 % | 2(+1) | +1.0 | +0.6 |
| SALF | 1.8 % | 0 | −0.2 | −0.1 |
Vs. previous: change in points from the same pollster's poll of July 6, 2026. Vs. average: difference from our weighted average of September 4, 2026.
Figures from the poll table on Wikipedia (CC BY-SA 4.0). Original publication: Ateneo del Dato.
How to cite: Su Momento, “CIS (Ateneo del Dato) poll of September 4, 2026”, September 4, 2026, https://sumomento.com/en/encuestas/cis-ateneo-del-dato-2026-09-04