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Sumas River (British Columbia) — a popular fishing spot. About 33 km long. A smart bite calendar — moon phase, atmospheric pressure, and weather combined into an hourly fish-activity forecast for the coming days.
Drizzle: 2–10 °C
In the fish list, this icon marks species recorded here by GBIF. Unmarked species may still occur in the waterbody.
The bite is moderate — fish feed in short bursts. Weather is steady, with no sharp swings — fish behave predictably.
Best time — 07:00–09:00 (dawn bite) and 20:00–22:00 (dusk bite).
Work the cover — snags, weed edges, hole entrances; retrieve the lure with pauses. The water's cold — fish it more delicately and slowly.
The water's turning murky — go with bright, noisy lures: small jig or minnow bait. The water's cold — work the lure slower than usual.
Bring a warm jacket — it's noticeably colder on the water than on shore. Rain is expected — don't forget a rain jacket or a waterproof shell.
An average day — best chances during peak windows.
The computed water temperature is around 8 °C — colder than the 14–24 °C comfort range for Black crappie: the fish conserves energy and takes more cautiously.
Black crappie works the twilight: the peaks are pinned to sunrise and sunset — their times are in the sun-and-moon card above.
Pressure is rising 2 hPa over the day — the bite usually settles down after a rise.
One more input — the moon's feeding windows: within their hours the score sits higher than across the rest of the day. The window times are in the “Solunar feeding periods” card below.
September is an average month for Black crappie here.
These are the same values the bite curve above was computed from. How the forecast works
Cloudy · feels like +7°
The day is 4 min shorter than yesterday.
Sunshine hours count direct sun only — cloud cover cuts it, so it is shorter than daylight.
The windows are set by the moon's transit and rise, and the forecast above already accounts for them: within these hours the bite score sits higher than across the rest of the day, while the day's overall level still comes from the catch-calibrated model.
What are solunar periods?Measured river conditions are available for Sumas River: current gauge height, streamflow, and water temperature when reported by the source.
USGS gauge SUMAS RIVER NEAR HUNTINGDON, 3 km away · measured 2026-09-03 16:35 · data source · provisional data, subject to revision