40–42°F in the Gulf: King Salmon Season Opens Under a Full Moon

What's Biting

What's Next

Water temperatures of 40–42°F are exactly where you'd expect them in the first week of May across the Gulf of Alaska, and the trajectory through the rest of the month typically trends warmer. Nearshore readings usually push toward 44–46°F by late May as longer days and increasing solar input begin working on shallower coastal zones. Buoy 46080 is already reading 2°F warmer than the other two stations, suggesting some localized nearshore warming may already be underway in that coverage area — worth watching as the month progresses.

Tonight's full moon is the most actionable near-term factor for Gulf anglers. Full moon phases generate the month's strongest tidal exchanges, and in a body of water as dynamic as the Gulf of Alaska, those large water movements push baitfish — herring, sand lance, capelin — through passages and along structure. The 48-hour window surrounding a full moon is traditionally one of the stronger bite windows for both king salmon and Pacific halibut. Plan to work the peak incoming and outgoing tides closest to dawn and dusk; stacking the lunar tide with low-light feeding behavior compounds the advantage.

King salmon are the headline target over the next several weeks. Early May typically marks the opening of the spring Chinook run in Southcentral Alaska, with fish moving into nearshore waters and bays ahead of river entry. Trolling large flashers with cut herring or spoons at moderate depth — 40–80 feet is a common starting range for cold-water early-season fish — is the standard Gulf tactic for Chinook. The 40°F water temperature may keep fish running slightly shallower than midsummer norms, though no depth-profile data is available from the active buoys to confirm exact holding depths.

Pacific halibut should be feeding actively, particularly on the strong tidal movements building around the full moon. Bottom fishing with heavy bait rigs over structure in deeper coastal zones is the traditional setup. Check current state regulations for bag limits and slot sizes before harvesting — rules in Alaska waters can vary by area and season.

Winds at buoy 46080 are running at 10 m/s (roughly 19 knots), which sits near the lower edge of conditions that make small-boat offshore work uncomfortable in exposed gulf waters. Monitor the marine forecast closely before committing to any offshore run this weekend — Gulf of Alaska conditions can deteriorate quickly.

Context

Water temperatures of 40–42°F are consistent with historical Gulf of Alaska norms for early May. The gulf runs cold year-round — sea surface temperatures typically bottom out near 38°F during February and March, climb through spring, and peak around 50–54°F in late July and August before declining again through fall. Early May sits squarely in the early-upswing phase of that cycle, and the readings from buoys 46001, 46066, and 46080 confirm conditions are tracking within the normal seasonal range.

The Gulf of Alaska king salmon fishery has historically been one of the most prized spring saltwater opportunities on the Pacific coast. Runs in Southcentral Alaska typically build through May and into June as fish stage in nearshore waters ahead of river entry. No Gulf of Alaska–specific angler reports appeared in the intel feeds for this report, making it impossible to assess whether 2026 run timing is tracking early, late, or on schedule relative to a typical year. That call is best made from local charter reports and state run-tracking data as the season develops.

The full moon falling in early May places peak tidal amplitude right at the start of the active Gulf season — a timing that experienced local guides traditionally regard as one of the more productive natural windows of the early year for bait concentration and feeding activity along coastal structure.

Without local angler testimony in the current feed, further comparisons to prior-season conditions would be speculative. The buoy data confirms environmental conditions are normal for this point in the calendar; on-the-water reports from area captains will be the definitive read on how fish counts and run timing are actually shaping up for 2026.