Portuguese legislative election, 1987 Opinion Polling 125 seats needed for a majority

| Date_Released | Institute | Social_Democratic | Socialist | Green_Communist | Democratic_Renewal | Democratic_and_Social_Centre | Lead_ |
|---|---|---|---|---|---|---|---|
| July 19, 1987 | Election Results | 50.2% 148 seats | 22.2% 60 seats | 12.1% 31 seats | 4.9% 7 seats | 4.4% 4 seats | 28.0% |
| July 19, 1987 | Exit Poll - RTP1 | 48.0% – 50.0% | 21.0% – 23.0% | 12.5% – 14.5% | 5.0% – 7.0% | 3.0% – 5.0% | 27.0% |
| July 19, 1987 | Exit Poll - Antena1 | 45.0% – 47.0% | 24.0% – 25.0% | – | – | – | 21.0% – 22.0% |
| July 17, 1987 | Euroexpansão/Expresso | 41.0% – 44.0% | 22.0% – 25.0% | 13.0% – 15.0% | 11.0% – 14.0% | 4.0% – 6.0% | 19.0% |
| October 6, 1985 | Election Results | 29.9% 88 seats | 20.8% 57 seats | 15.5% 38 seats | 17.9% 45 seats | 10.0% 22 seats | 9.1% |