Upper Grinnell Lake

Glacier County, MT

MAYBEConfidence · Medium
Best bite window
The highlighted window has passed. This read is still based on the latest cached weather; use the 7-Day forecast below for the next window.
Main reason
dry conditions across the window
Main risk
a front passing through

MAYBE on Upper Grinnell Lake — light winds and rising pressure after a passing system for this window. Watch a front passing through and pressure swinging. Weather-only read (no on-water history calibrating this yet).

Next forecast window
MAYBE

Wed · Oct 28, 10 AM → 2 PM (America/Denver)

Full read

The latest cached fishing-weather read for Upper Grinnell Lake in Glacier County, MT is MAYBE. Its highlighted window has passed, so use the 7-day forecast below for the next available window. The main factor in its favor was dry conditions across the window, while the main watch-out was a front passing through. Its cached forecast evidence included wind near 4 mph out of the southwest, gusting to 5 mph; surface pressure near 836 hPa on an unstable trend; 0.00 inches of rain; and air temperature near 25 °F with overcast dominant. Confidence in this cached read is medium; it was generated October 26, 2026, 9:17 AM UTC, and reads refresh on a daily cadence. This is a weather-only read built from forecast weather; it does not yet use on-water reports, and confidence is capped until local water data or feedback exists.

UPDATED October 26, 2026, 9:17 AM UTCBUCKET 2026-10-26ENGINE 0.7.0

Conditions at a glance

Wind
4mph

SW · gust 5

Rain / Weather
0in

Overcast

Temp
25°F

-4°C · hum 68%

Pressure
24.69inHg

Unstable

7-Day Fishing Forecast

One read per day — the bite call, the window, the weather behind it

  1. Mon · Oct 26
    Window passed
    MAYBE
    A front passing through
    43° / 25°F
    4 mph · SWgust 17
    0.00 in
    ↓ -9.2 hPa
  2. Tue · Oct 27
    5 PM → 9 PM
    SKIP
    Extreme gusts
    36° / 32°F
    13 mph · SWgust 32
    0.80 in
    → +1.6 hPa
  3. Wed · Oct 28
    10 AM → 2 PM
    MAYBE
    A front passing through
    32° / 23°F
    7 mph · SWgust 16
    0.61 in
    ↑ +10.9 hPa
  4. Thu · Oct 29
    10 AM → 2 PM
    MAYBE
    A front passing through
    32° / 16°F
    3 mph · Egust 7
    0.13 in
    → +2.2 hPa
  5. Fri · Oct 30
    4 AM → 8 AM
    MAYBE
    A front passing through
    37° / 18°F
    4 mph · Egust 6
    0.00 in
    ↓ -7.6 hPa
  6. Sat · Oct 31
    6 PM → 10 PM
    MAYBE
    A front passing through
    36° / 25°F
    7 mph · SWgust 12
    0.00 in
    ↓ +0.2 hPa
  7. Sun · Nov 1
    4 AM → 8 AM
    MAYBE
    A front passing through
    34° / 23°F
    10 mph · SWgust 12
    0.00 in
    ↑ +5.6 hPa

Last 3 days

Recent context — what just happened

Pressure
Unstable
+18.6 hPa over 72h
Rain
Light rain
0.15 in totallast 72h
Wind
Gusty
7 mph · gust 36 · NE
Temperature
Cooler
-23.0°F over 72h50–23°F range

Weather-only read. Confidence is capped until local water data or feedback exists.

Nearby waters

Weather data by Open-Meteo — CC BY 4.0. Fishing Weather derives the fishing read.