The weather in mid-April is likely to be quite nice, but ... the road is likely to be still closed. It's maintained by the county (Inyo), and the road to the Portal, as well as Cottonwood Meadows slightly to the south, typically aren't opened until mid-May at the earliest. It's not so much the snow some years, but the rocks/boulders that block the roads.
All's not lost, however. There's a large parking area on the right, just before the gate, and you can then hike up the road to the Portal - allow about two hours. From there you can hike up the trail. This is starting out as a snowy year, so you may need traction (like microspikes). Watch this board, and the Portal BB, as there's usually sporadic reports of trail conditions on the main trail.
