Victory gave the British wheelchair racing champion a clean sweep of four gold medals after earlier winning the T54 800, 1500 and 5,000 metres titles.
"It's a dream come true," Weir told Channel 4. "Obviously I dreamt about winning all my races but it was going to be a tough order. I really had to dig deep. I did have lots of dreams of winning four gold medals but I think everybody has those dreams. I knew I was capable of doing it.
"The reason I say I only want one gold is because I don't want to put myself under pressure. I want to go into every race not feeling pressured.
"To tell you the truth, every race I did in that stadium I didn't feel under pressure because the crowd was behind you if you won, lost or anything. It didn't matter what position you came in, they were still behind you and they still loved you."
Weir added: "I didn't even know where the finishing line was. That's why I didn't celebrate. There's two lines: the start line and the finishing line. Usually we have a tape, so I was carrying on through. If I looked a little bit moody across the line it's because I didn't know where the line was. I didn't know how close they were so I just had to carry on pushing."