Measured · 2 gauges reporting · 3:24 PM EDT on September 28, 2026
The border-lakes country and the Rainy — canoe water, lake trout, and the streams between the portages.
Boundary Waters water is running 61–64°F across 2 gauges reporting in the last 6 hours. 2 are in prime shape — Rainy River at 61°F, Kawishiwi River at 64°F. Air holds in the 70s through Thu, and water should hold about where it is, and 2.1″ of rain in the window will bump flows and cool the freestones.
Every temperature behind the clock on this page is a measurement — USGS water temperature at a real gauge, taken within 6 hours of the reading's own hour. Hours ahead of the last measurement are projected from the hourly air forecast and are labelled as projected. That is also why the lists below are only as long as the gauge network is dense — a river with no gauge on it has nothing measured to report.
Data refreshed nightly, current-hour rendered live — this page carries 24 hours of measured water behind 3:24 PM EDT on September 28, 2026 and 48 ahead of it, and shows the hour you are reading it in.
The bands are the map's own: the same breaks BirdTrout paints water with, so a stream that is green here is green there.
under 64°F — trout are feeding
64–70°F — fish early, keep fights short
Nothing in this band right now.
over 70°F, or under 40°F — leave it alone
Nothing in this band right now.
Nothing is at peak emergence here this month. Terrestrials and nymphs carry the water between hatches.
Air holds in the 70s through Thu, and water should hold about where it is, and 2.1″ of rain in the window will bump flows and cool the freestones.
| Day | High | Low | Rain |
|---|---|---|---|
| Mon 2026-09-28 | 72°F | 44°F | 0.00″ |
| Tue 2026-09-29 | 62°F | 59°F | 2.12″ |
| Wed 2026-09-30 | 75°F | 53°F | 0.01″ |
| Thu 2026-10-01 | 59°F | 41°F | 0.00″ |
Air, not water. Water follows smoothed air with a sensitivity well below one — a spring creek barely feels a hot afternoon and a shallow freestone nearly tracks it — so this table is a direction, and the measurements above are the answer.
1,104 classified stream miles in Boundary Waters, by MN DNR Chapter 6264 designation. This is the standing classification, not today's temperature — it is what the water is normally, which is the context the readings above sit in.
| Class | Miles |
|---|---|
| designated trout stream | 884 |
| designated trout stream tributary | 220 |
Rivers here with a full BirdTrout page — survey history, access, public land and regulations — whether or not a gauge is reporting on them this hour.