A cold front
The best thing that can happenA drop in temperature — especially a sharp front with falling pressure — fires up elk movement at every point in the season. Cold pushes elk to feed harder and move more in daylight, and during the rut it can turn a quiet morning into the loudest bugling of the year. If you can time a hunt to a cold front, do it.
Snow
Concentrates + reveals — or pushes offSnow does two things. It concentrates elk on south-facing slopes and lower benches where they can still feed, and it reveals movement and lets you track. But a heavy dump can also push elk off a unit entirely toward winter range. Moderate, building snow is a gift; a blizzard is a gamble.
Wind
High wind shuts elk downElk dislike high wind — it muffles the sounds and scents they live by, makes them nervous, and tends to push them into sheltered timber and bed them down. Hunting is usually slow in a hard blow. Light, steady wind, on the other hand, is a stalker's friend: it covers your noise and tells you where to keep your scent.
Rain
Quiet stalking, then a feedSteady rain often beds elk in cover, but it softens the ground and the noise, making a careful stalk far quieter — and elk frequently move and feed hard as the rain breaks. Hunting the edges of a rain event, especially the clearing behind it, can be excellent.
Warm + high pressure
The tough daysWarm, clear, high-pressure weather is the hardest hunting. Elk go nocturnal, feed at night, and bed deep in shaded timber by mid-morning, barely moving in daylight. On these days, hunt the first and last minutes of light hard, glass the shade, and be patient — the country isn't empty, the elk are just hiding from the heat.