Sweden finished joint-12th on the medal table thanks to Armand Duplantis' gold in the men's pole vault on day two and Axelina Johansson's bronze in the women's shot put on the opening day.
In the evening session on day three, Samuel Pihlstrom was back on the track for the final of the men's 1500m after winning his heat on Friday in a time of 3:43.38. His heat was by far the slowest of the three, meaning he would likely have to produce something much quicker this evening.
The Swede got himself to the front of the nine-man bunch in the first 100m in an attempt to control the pace, before Mariano Garcia of Spain came to challenge him around 300m in.
Pihlstrom was happy to tuck in in third behind Portugal's Isaac Nader in third, before latching onto Garcia's shoulder as the Spaniard looked to increase the pace approaching halfway. With 1000m in sight, the 25-year-old risked getting boxed in as Nader came round on his outside.
The penultimate lap saw Pihlstrom again with not enough room on the inside as Federico Riva of Italy attempted to challenge for bronze, and at the bell, the two leaders began to put daylight between themselves and the rest.
Garcia kicked again in the final 150m, holding on for gold in a time of 3:39.63, 0.43 clear of Nader, and in the home straight, Adam Spencer of Australia came through on the inside to take bronze and deny Pihlstrom a first major championship medal, as the Swede clocked 3:40.59.
That fourth place came after Khaddi Sagnia had also finished fourth in the women's long jump.
Sagnia began the competition in fine style, jumping a season's best 6.78m that immediately justified talk of her being one of the medal contenders in Torun, and took her into second place in the 16-strong field.
She remained consistent, with clean jumps of 6.75m and 6.76m, but following a 6.70m with her fourth attempt, she then fouled on her penultimate jump, leaving her in fourth place having not improved since her initial effort.
The former European indoor bronze medallist then needed at least a jump of 6.81m with her final attempt to give herself a chance of a medal, but gave away 26.8cm at the take-off board - the biggest offset in the whole event - only registering a jump of 6.48m, leaving her in an agonising fourth place.
Gold was won by Portugal's Agate de Sousa with a best of 6.92m, five centimetres further than Italy's Larissa Iapichino, while Natalia Linares of Colombia took bronze with a season's best 6.80m.
Swedish hopes then turned to Wictor Pettersson, who was competing in the men's shot put competition.
Pettersson was looking to improve on his sixth place at this event a year ago, and made a solid start with a 20.15m throw that had him lying eighth after each of the 16 men had had one attempt, before adding 70cm more with his second go to fifth.
His consistent improvements continued in the third round, registering 21.12m, but a foul with his fourth throw meant he came into his penultimate attempt still sitting outside the podium places.
No improvement in the fifth round - 21.07m - left the 27-year-old needing at least 21.23m to challenge for a medal, but a looping final throw fell short before Pettersson stepped forward from the circle, ensuring it wouldn't be measured, sealing a fifth-placed finish.
Tom Walsh of New Zealand took gold, having already sealed first place he extended his lead with a final throw of 21.82m, ahead of American duo Jordan Geist (21.64m) and Roger Steen (21.49m).
Finally, 2022 World Indoor silver medallist Thobias Montler finished 10th in the men's long jump.
Following a pair of fouls in his opening two jumps, Montler got something on the board with his third attempt, but would need more than his 7.94m with attempt four to be allowed a fifth jump. Needing 8.05m minimum, the 30-year-old only managed 7.85m, not improving on 10th place.
Gerson Balde of Portugal took gold with a world-leading 8.46m, clear of Mattia Furlani of Italy and Bulgaria's Bozhidar Saraboyukov.