Gem Lake

Jefferson County, MO

MAYBEConfidence · Low

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 Gem Lake — light winds and dry conditions across the window for this window. Watch a front passing through. Weather-only read (no on-water history calibrating this yet).

Next forecast window

MAYBE

Fri · Jul 24, 8 AM → 12 PM (America/Chicago)

Full read

The latest cached fishing-weather read for Gem Lake in Jefferson County, MO 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 east, gusting to 11 mph; surface pressure near 999 hPa on a steady trend; 0.00 inches of rain; and air temperature near 70 °F with overcast dominant. Confidence in this cached read is low; it was generated July 23, 2026, 11:39 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 July 23, 2026, 11:39 AM UTCBUCKET 2026-07-23ENGINE 0.7.0

Conditions at a glance

Wind: 4mph
E · gust 11
Rain / Weather: 0in
Overcast
Temp: 70°F
21°C · hum 70%
Pressure: 29.50inHg
Steady

7-Day Fishing Forecast

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

Thu · Jul 23
Window passed
MAYBE
A front passing through
84° / 64°F
4 mph · Egust 14
0.00 in
↓ +0.1 hPa
Fri · Jul 24
8 AM → 12 PM
MAYBE
A front passing through
84° / 66°F
5 mph · Sgust 17
0.26 in
↓ -1.7 hPa
Sat · Jul 25
4 AM → 8 AM
MAYBE
A front passing through
99° / 68°F
5 mph · Sgust 19
0.03 in
↓ -4.5 hPa
Sun · Jul 26
4 AM → 8 AM
MAYBE
A front passing through
106° / 75°F
4 mph · SWgust 17
0.00 in
↓ -3.1 hPa
Mon · Jul 27
11 AM → 3 PM
MAYBE
A front passing through
108° / 77°F
11 mph · Wgust 28
0.00 in
↓ -6.4 hPa
Tue · Jul 28
4 AM → 8 AM
MAYBE
A front passing through
99° / 75°F
5 mph · Wgust 31
0.00 in
↑ +8.4 hPa
Wed · Jul 29
6 AM → 10 AM
MAYBE
A front passing through
106° / 72°F
3 mph · SEgust 17
0.66 in
→ +1.9 hPa

Last 3 days

Recent context — what just happened

Pressure

Rising

+4.6 hPa over 72h

Rain

Dry stretch

0.00 in totallast 72h

Wind

Gusty

5 mph · gust 25 · NW

Temperature

Cooler

-5.9°F over 72h93–68°F range

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

Nearby waters

Rustic Hills Lake· Jefferson County, MO
Cedar Hill Lake Number 3· Jefferson County, MO
Volumer Lake· Jefferson County, MO
Lake Adelle· Jefferson County, MO
Lakes of Deerwood· Jefferson County, MO
Lake Pottawatomie· Jefferson County, MO

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