Situated in Algarve's second largest city, its stadium, the Estádio Municipal de Portimão, has a capacity of 9,544 spectators after undergoing renovation in early 2011. The club never won any major honours, but participated in the Primeira Liga for several seasons.
Portimonense's zenith was in the 1980s, a decade in which the club only played its football in the top division, also competing in the UEFA Cup in 1985–86. They reached the semifinals of the Taça de Portugal three times, in 1983, 1987, and 1988.
In the 90's and 2000's, however, the club primarily played in the Segunda Liga, while also having a brief spell in the third level. In 2009–10, Portimonense started with AngolanLito Vidigal at the helm, but when he left for União de Leiria, former Sporting midfielder Litos took charge, and led the team to a final second place, behind S.C. Beira-Mar, thus returning it to the top flight after exactly 20 years of absence.
Midway through the 2010–11 campaign, Litos was fired due to bad results, being replaced by Carlos Azenha, who presented his resignation a few weeks after being appointed, only to have his wish refused by the board of directors, as Portimonense eventually ranked second from bottom and was relegated back. The team met the same fate in the following season, even managing to rank in a worse position; however, after Varzim S.C. was not allowed to promote from division three due to financial irregularities, Portimonense was reinstated.
On 13 July 2011, Portimonense elected its body of officials, for a three-year term.
President: José Fernando Teixeira da Rocha
Deputy president: António Alexandre Soares Rocha da Silveira
Vice-presidents: Luís Manuel de Andrade Rodrigues Batalau, José Cândido Rebelo Rodrigues, Nuno Miguel Lopes da Silva, João Carlos Pinhota Martins Santana, Francisco José de Matos Viegas Gouveia Coutinho, Luís Carlos da Costa Paiva
Portimonense has its own club song: "Portimonense, expoente algarvio". Unlike many other football clubs, the supporters own and operate Portimonense, although this is more common in Iberia than in much of Europe.