Over 60 percent of respondents in the survey said the hour should not change, which contradicts recommendations made by scientists.
In the public consultation conducted by the European Commission (EC), which had 4.6 million contributions, 84 percent of Europeans advocated an identical position.
However, this position of the majority of the population is opposed to that of scientists.
The Lisbon Astronomical Observatory defends the maintenance of the current regime and has already warned of risks to health, especially to children, should the twice-yearly clock adjustments be scrapped.
Porto and the North Coast regions are the areas where most people are against the changing of the hour. In southern Portugal and on the islands the opinion is split 50-50, while in rural areas, just over 40 percent of respondents want to maintain the current situation, compared to 56.5% who want to end the change of time.
Prime Minister António Costa has said that for now Portugal will maintain the current regime, but the final decision will be European. The EC and European Parliament have until April 2019 to decide, and it is up to the European Council to approve the decision.