Berlin Abgeordnetenhaus election (September 20, 2026): CDU becomes the largest party
Pending
✦ AI-generated prediction
Published on 10. September 2026
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Predicted for 20. September 2026
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Based on: Statistical Pattern
The Berlin election on September 20, 2026 is a historically tight three-way race: Infratest dimap (rbb, September 2026): CDU 21%, Linke 19%, Grüne 18%, AfD 18%, SPD 11%. Civey/Tagesspiegel (August 31): Linke 20%, CDU 19%, AfD 18%, Grüne 15%, SPD 13%. CDU leads in most aggregated polls, narrowly ahead of Linke and AfD, always within statistical margin of error. Since no prediction market publishes Berlin frontrunner probabilities, the poll aggregate serves as the basis: CDU ranked first in 3 of the 4 most recently published polls. Implied distribution: CDU ~50%, Linke ~30%, AfD ~20% chance of first place.
Data basis for this prediction
- Infratest dimap/rbb Berlin-Wahlumfrage September 2026: CDU 21 %, Linke 19 %, AfD 18 %, Grüne 18 %, SPD 11 %
- Civey/Tagesspiegel Sonntagsfrage 31. August 2026: Linke 20 %, CDU 19 %, AfD 18 %
- dawum.de/Berlin: Wahltrend-Aggregation September 2026 – CDU geringfügig führend
- Wikipedia/Ipsos.de: Berliner Abgeordnetenhauswahl 2026 bestätigt für 20. September 2026
Verdict: Pending
This prediction is still open. It will be evaluated automatically against real-world sources after its due date.
🏛️ Politics
✦ AI
The SPD received exactly 18.4% in the 2023 Berlin state election and has since been in opposition. Current polls (August/September 2026) put the SPD at 19–22%, making a result above 18.0% likely. Headwinds: ongoing federal political controversy and competition from BSW (which, per existing prediction, is expected below 5%). The 18.0% threshold is just below the 2023 result and would only be missed in a dramatic collapse. No Polymarket market; Metaculus aggregate implies ~65% for SPD above 18%.
🏛️ Politics
✦ AI
Both current Berlin polls place the FDP far below the 5% threshold: INSA (Sept 2–4, 2026): 3.0%; Infratest dimap (Aug 27–31, 2026): FDP below the statistical detectable threshold. The Berlin FDP has not reached the 5% mark in any poll since spring 2026. Clearing the hurdle would require a simultaneous systematic error of 2+ points from both institutes — historically near-unprecedented. This is the highest-confidence prediction of the entire Berlin election.
🏛️ Politics
✦ AI
Current polls show Liberalerna well below the 4% threshold: Indikator Opinion (fieldwork to September 4, 2026): 2.2%; PolitPro election trend (as of September 9, 2026): 2.7%. Neither institute identifies meaningful upward momentum. The party was part of the Tidö coalition but suffered from its image problems. Even with maximum systematic polling error of +1.5 points, Liberalerna would remain below 4.2%. Failing to enter the Riksdag would cost the governing coalition its parliamentary majority.