Lake Francis Case

Brule County, SD

MAYBEConfidence · Medium
Best bite window
Sat · Sep 12, 4 PM → 8 PM (America/Chicago)
Main reason
dry conditions across the window
Main risk
a front passing through

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

Full read

The current fishing-weather read for Lake Francis Case in Brule County, SD is MAYBE, with the best four-hour window on Sat, Sep 12 from 4 PM to 8 PM (America/Chicago). The main factor in its favor is dry conditions across the window, and the main watch-out is a front passing through. During that window the forecast calls for wind near 7 mph out of the northeast, gusting to 9 mph, surface pressure near 957 hPa on a rising trend, and rainfall totaling 0.00 inches over the four hours. Air temperature in the window sits near 77 °F, with a dominant forecast of overcast. Confidence in this read is medium; it was generated September 10, 2026, 1:00 PM UTC, and reads refresh on a daily cadence. This is a weather-only read built from forecast weather alone; it does not yet use on-water reports, and confidence is capped until local water data or feedback exists.

UPDATED September 10, 2026, 1:00 PM UTCBUCKET 2026-09-10ENGINE 0.7.0

Conditions at a glance

Wind
7mph

NE · gust 9

Rain / Weather
0in

Overcast

Temp
77°F

25°C · hum 29%

Pressure
28.26inHg

Rising

7-Day Fishing Forecast

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

  1. Thu · Sep 10
    Window passed
    MAYBE
    A front passing through
    88° / 52°F
    11 mph · Sgust 22
    0.00 in
    ↓ -10.9 hPa
  2. Fri · Sep 11
    Now → 8 AM
    MAYBE
    A front passing through
    97° / 66°F
    10 mph · Sgust 33
    0.00 in
    ↓ -2.5 hPa
  3. Sat · Sep 12
    4 PM → 8 PM
    MAYBE
    A front passing through
    77° / 61°F
    7 mph · NEgust 29
    0.00 in
    ↑ +10.1 hPa
  4. Sun · Sep 13
    4 AM → 8 AM
    MAYBE
    A front passing through
    63° / 55°F
    9 mph · Egust 31
    0.27 in
    ↓ -2.5 hPa
  5. Mon · Sep 14
    7 AM → 11 AM
    MAYBE
    A front passing through
    75° / 57°F
    4 mph · SWgust 36
    0.65 in
    ↑ +5.1 hPa
  6. Tue · Sep 15
    4 AM → 8 AM
    MAYBE
    A front passing through
    68° / 52°F
    7 mph · NWgust 30
    0.00 in
    ↑ +8.5 hPa
  7. Wed · Sep 16
    4 AM → 8 AM
    MAYBE
    A front passing through
    72° / 55°F
    5 mph · Egust 14
    0.00 in
    → +0.7 hPa

Last 3 days

Recent context — what just happened

Pressure
Rising
+6.1 hPa over 72h
Rain
Dry stretch
0.00 in totallast 72h
Wind
Gusty
9 mph · gust 33 · S
Temperature
Cooler
-9.2°F over 72h84–57°F range

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

About Lake Francis Case

Surface area
102,000 acres
Max depth
140 ft
Elevation
1,355 ft
Managing agency
U.S. Army Corps of Engineers (Omaha District)
Dam
Fort Randall Dam (Missouri River)

Primary species: Walleye, Sauger, White bass, Smallmouth bass, Largemouth bass, Channel catfish, Black crappie, Northern pike, Yellow perch, Bluegill, Freshwater drum, Paddlefish, Bullhead catfish.

Notable structure: White River delta (splits reservoir into an 'upper lake' and 'lower lake'), Chamberlain 'dredge-hole' deep-water area, fine alluvial sediment and sand bottom, short bays with few large protected coves.

Nearby waters

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