Siwash Reservoir

Phillips 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 Siwash Reservoir — 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

Tue · Oct 27, 4 AM → 8 AM (America/Denver)

Full read

The latest cached fishing-weather read for Siwash Reservoir in Phillips 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 7 mph out of the east, gusting to 12 mph; surface pressure near 931 hPa on an unstable trend; 0.00 inches of rain; and air temperature near 34 °F with overcast dominant. Confidence in this cached read is medium; it was generated October 26, 2026, 9:48 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, 9:48 AM UTCBUCKET 2026-10-26ENGINE 0.7.0

Conditions at a glance

Wind
7mph

E · gust 12

Rain / Weather
0in

Overcast

Temp
34°F

1°C · hum 86%

Pressure
27.49inHg

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
    52° / 32°F
    7 mph · Egust 22
    0.00 in
    ↓ -13.2 hPa
  2. Tue · Oct 27
    4 AM → 8 AM
    MAYBE
    A front passing through
    52° / 36°F
    4 mph · SEgust 34
    0.06 in
    ↓ -3.6 hPa
  3. Wed · Oct 28
    5 AM → 9 AM
    MAYBE
    A front passing through
    50° / 36°F
    7 mph · Wgust 21
    0.00 in
    ↑ +11.2 hPa
  4. Thu · Oct 29
    1 PM → 5 PM
    MAYBE
    A front passing through
    39° / 30°F
    7 mph · Ngust 20
    0.00 in
    ↑ +5.5 hPa
  5. Fri · Oct 30
    4 AM → 8 AM
    MAYBE
    A front passing through
    54° / 32°F
    6 mph · Egust 23
    0.00 in
    ↓ -14.3 hPa
  6. Sat · Oct 31
    4 AM → 8 AM
    MAYBE
    A front passing through
    54° / 39°F
    3 mph · Ngust 6
    0.00 in
    ↑ +3.1 hPa
  7. Sun · Nov 1
    4 AM → 8 AM
    MAYBE
    A front passing through
    55° / 45°F
    5 mph · Sgust 13
    0.05 in
    ↓ -0.7 hPa

Last 3 days

Recent context — what just happened

Pressure
Unstable
+22.8 hPa over 72h
Rain
Light rain
0.19 in totallast 72h
Wind
Gusty
9 mph · gust 37 · NE
Temperature
Cooler
-19.1°F over 72h61–30°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.