Overview
- The CIS estimates PSOE at 32.7% and PP at 23.7%, a nine‑point gap that marks the PP’s lowest reading of the legislature.
- Fieldwork comprised 4,122 interviews conducted September 1–6, making it the first national snapshot after the August fires.
- Since July, PSOE gains 5.7 points while PP falls 2.8; Vox eases to 17.3%, with Sumar steady at 7.9% and Podemos at 4.3%.
- Housing is cited as the top problem by 30.4% of respondents, followed by immigration at 20.7%, with strong worry about wildfires.
- Three in four respondents (75.1%) back a cross‑party pact on climate and emergencies, and CIS totals put PSOE+Sumar at 40.6% versus PP+Vox at 41%.