Air carrier First Officer reported becoming low on final approach while transitioning from instruments to visual cues resulting in a below glideslope warning in IMC weather. The Captain ordered a go-around and returned for another approach and safe landing.

Narrative

Arriving into SDF airspace from the south; we encountered weather and deviated east; planning for an approach to 17L. After multiple reroutes and avoiding weather we realized SDF had switched to north flow. We set up for the ILS 35R and were vectored onto the approach. We descended through several layers and were in IMC until approximately 400ft AGL. As we gained visual with the runway; I disconnected autopilot and left auto throttles engaged. I was looking outside and visually flying to what I thought was a proper glideslope. I may have fallen for an illusion due to the cloud decks and rain. The Captain called youre ducking under. I looked down at my flight display; saw that the flight director was commanding nose up and that I was low on glideslope; and pulled back on the stick and pushed the throttles forward to correct this as I transitioned my gaze back outside toward the runway. At this time we were around 300ft AGL and received an EGPWS (Enhanced Ground Proximity Warning System) audible and visual GLIDESLOPE as the captain called for the go around. Subsequently we were vectored to the ILS 35L and landed without any further issues. Afterwards; we debriefed the importance of maintaining a cross check both inside and outside the aircraft. I relied too heavily on my visual perception once the autopilot was disconnected; and my focus should have still been on my instruments as we exited the weather and transitioned to visual for the landing.