The best low-and-slow accessories for a Weber Smokey Mountain are an accurate dual-probe digital thermometer, a chimney starter for lighting coals Minion-style, and — if you want truly hands-off cooks — a fan-driven temperature controller mounted with a WSM lower-vent adapter. With those three covered, extras like gasket kits, rib racks, and water-pan mods simply refine an already excellent smoker.
That's the honest answer, and it's a short list because the WSM needs so little help. Here's why — and how to spend your money in the right order.
Why is the WSM already great at low-and-slow?
The Weber Smokey Mountain is a bullet-shaped water smoker: a porcelain-enameled steel body with a charcoal ring at the base, a water pan that acts as a heat sink, and two cooking grates stacked above it. It comes in three sizes — the 14.5" (286 square inches of cooking space), the 18.5" (481 square inches), and the 22.5" (726 square inches) — and airflow is managed with three bottom vents plus a single top vent.
Once you learn the vents, a WSM will hold 225–250°F for hours with almost no fuss. So the point of accessories isn't to fix the smoker — it's to remove the two remaining chores: measuring grate temperature accurately and babysitting airflow on long cooks.
Which accessories actually matter for low-and-slow?
In order of impact:
- 1. Dual-probe digital thermometer — one probe at the grate, one in the meat
- 2. Chimney starter — clean, fast coal lighting for the Minion method
- 3. Automatic temperature controller + vent adapter — set-and-forget airflow
- 4. Water-pan mods — foil, sand, or a terra-cotta saucer
- 5. Gasket and hinge kits — a tighter seal and an easier lid
- 6. Racks, gloves, cover, instant-read thermometer — quality-of-life extras
Do you need a separate thermometer for a WSM?
Yes — it's the single most important upgrade. The stock lid thermometer measures air up at the dome, which commonly runs 15–25°F hotter than grate level on a bullet smoker. Since every low-and-slow target — 225°F for brisket, 250°F for ribs — refers to the air at grate level, you're flying blind without a probe clipped where the food actually sits.
A dual-probe (or multi-probe) leave-in thermometer handles both jobs at once: one probe on the grate for pit temp, one in the thickest part of the meat for internal temp. You'll see