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Forecast
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© 2026·AI-powered bite forecast
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United States / California / San Joaquin River

Bite forecast: San Joaquin River

  • length 336 mi
  • San Joaquin River basin
Loading map…

Best fishing days for the next week

  1. TuesdaySeptember 8weather-based forecast
    36/100medium activity

    Cloudy: 68–86 °F

  2. ThursdaySeptember 3weather-based forecast
    35/100medium activity

    Clear: 57–82 °F

  3. WednesdaySeptember 2weather-based forecast
    32/100medium activity

    Clear: 55–82 °F

Nearby towns

  • Antioch1 mi
  • Stockton3 mi
  • Manteca5 mi

San Joaquin River (California) — one of the area's fishing spots. About 541 km long. Nearby towns: Antioch, Stockton and Manteca. See when the bite is best: hourly fish activity for the days ahead, computed from the weather, pressure, and season.

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Catches

Recorded 6 catches here. Most commonly caught: Largemouth bass, Striped bass, Bluegill. Peak season: April–August.

  • Striped bass — San Joaquin River, May 05, 2018, 6:46 AM
    2
    Striped bass
    San Joaquin River
    75 °F7 mph
    May 05, 2018, 6:46 AM
  • Largemouth bass
    San Joaquin River
    93 °F0 mph
    Aug 02, 2020
  • Largemouth bass
    San Joaquin River
    86 °F4 mph
    Jul 20, 2019
  • Largemouth bass
    San Joaquin River
    84 °F2 mph
    Jun 02, 2019
  • Bluegill
    San Joaquin River
    77 °F4 mph
    Apr 21, 2018
  • Black crappie
    San Joaquin River
    73 °F9 mph
    Apr 20, 2018

Nearby water bodies

  • ReservoirEl Nido Reservoir9 mi

Bite calendar

Aug 31 – Sep 6
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Bite activity:highmediumlowslow
Based on:weatherseasonal
What is a bite calendar?
Coho salmonStriped bassBlack crappieSmallmouth bassSteelheadWhite bassWhite crappieCutthroat troutChinook salmonLargemouth bassBlue catfishBluegillBrook troutCarpChannel catfishFlathead catfishRainbow troutSpotted bass

Black crappie

6/10 · Fair

Hourly activity

0:006:0012:0018:0023:00
Bite activity:highmediumlow

The bite is strong — fish are active. Weather is steady, with no sharp swings — fish behave predictably.

Peak bite hours

Best time — 06:00–08:00 (dawn bite) and 19:00–20:00 (dusk bite).

Tactics

Work the cover — snags, weed edges, hole entrances; retrieve the lure with pauses.

Lures

The water's turning murky — go with bright, noisy lures: small jig or minnow bait.

Gear

It's a hot day — a hat, sunglasses, and plenty of water are a must. Winds will be strong — wind protection helps, and be careful if you're in a boat.

Summary

Worth going — it's a productive day.

How this forecast is calculated

Why this forecast

The computed water temperature is around 78 °F — warmer than the 57–75 °F comfort range for Black crappie: in the heat it drops deeper and feeds less often.

Computed water temperature by month; the green band is the 57–75 °F comfort rangecomfort 57–75 °F78 °F
JFMAMJJASOND

Black crappie works the twilight: the peaks are pinned to sunrise and sunset — their times are in the sun-and-moon card above.

The day: daylight hours and when Black crappie feeds0:0012:0024:00

Pressure is dropping 0.06 inHg over the day — fish are usually more active ahead of a weather change.

Pressure through the day, 0.06 inHg change
00:00 · 29.7923:00 · 29.72 inHg

One more input — the moon's feeding windows: within their hours the score sits higher than across the rest of the day. The window times are in the “Solunar feeding periods” card below.

Feeding windows on the day scale0:0012:0024:00

September is an active season for Black crappie here.

JFMAMJJASOND

These are the same values the bite curve above was computed from. How the forecast works

3 SepThursday, September 3
+78°

Clear · feels like +71°

Low / high
+58°…+83°
Precipitation
0.00 in
Wind
18 mph SW
Cloud cover
0%
Humidity
24%
Pressure
29.76 inHg
00:00+61°—8 mpheast wind, 8 mph33%0%
01:00+61°—10 mphsoutheast wind, 10 mph37%0%
02:00+60°—11 mphsoutheast wind, 11 mph39%0%
03:00+59°—11 mphsoutheast wind, 11 mph41%0%
04:00+58°—11 mphsoutheast wind, 11 mph43%0%
05:00+58°—11 mphsoutheast wind, 11 mph43%0%
06:00+58°—10 mphsoutheast wind, 10 mph44%0%
07:00+58°—10 mphsoutheast wind, 10 mph46%0%
08:00+64°—6 mphsouth wind, 6 mph40%0%
09:00+69°—10 mphsouthwest wind, 10 mph33%0%
10:00+73°—14 mphsouthwest wind, 14 mph29%0%
11:00+75°—16 mphsouthwest wind, 16 mph27%0%
12:00+78°—18 mphsouthwest wind, 18 mph24%0%
13:00+81°—19 mphsouthwest wind, 19 mph22%0%
14:00+82°—20 mphsouthwest wind, 20 mph21%0%
15:00+83°—22 mphsouthwest wind, 22 mph20%0%
16:00+82°—23 mphsouthwest wind, 23 mph20%0%
17:00+81°—26 mphsouthwest wind, 26 mph23%0%
18:00+78°—28 mphsouthwest wind, 28 mph27%0%
19:00+73°—23 mphsouthwest wind, 23 mph35%0%
20:00+69°—21 mphsouthwest wind, 21 mph43%0%
21:00+68°—15 mphsouthwest wind, 15 mph42%0%
22:00+66°—14 mphsouthwest wind, 14 mph43%0%
23:00+64°—13 mphsouthwest wind, 13 mph47%0%
+83°+70°+58°
Weather throughout the day
0:006:0012:0018:0023:00

Sun and moon

Thursday, September 3
The day: daylight and the hours the moon is above the horizon. Local time0:0012:0024:00
DaylightMoon above the horizon
Sunrise
06:22
Sunset
19:12
Day length
12 h 50 min
Sunshine hours
12 h 34 min
UV index
7
high
Moon
Last quarter
Moonrise
23:13
Moonset
13:47

The day is 2 min shorter than yesterday.

Sunshine hours count direct sun only — cloud cover cuts it, so it is shorter than daylight.

Solunar feeding periods

+16% in the windowThursday, September 3
Feeding windows on the day scale, local time0:0012:0024:00
Major periodsMinor periods
  • Major05:02–07:02Moon overhead
  • Minor13:17–14:17Moonset
  • Major17:32–19:32Moon underfoot
  • Minor22:43–23:43Moonrise

The windows are set by the moon's transit and rise, and the forecast above already accounts for them: within these hours the bite score sits higher than across the rest of the day, while the day's overall level still comes from the catch-calibrated model.

What are solunar periods?

Measured river conditions are available for San Joaquin River: current gauge height, streamflow, and water temperature when reported by the source.

Water

Gauge height
2.70 ft
Streamflow
153 ft³/s
Water temp · measured
55 °F
In the model
78 °F

USGS gauge SAN JOAQUIN R NR MENDOTA CA, 23 mi away · measured 2021-12-09 00:00 · data source · provisional data, subject to revision

BiteGuide·From anglers’ reports

What actually worked on this water

Based on 6 verified catchesPeriod: 2018–2020

This is a summary of anglers' reports, not a proven cause of the bite: conditions lining up does not mean they drove it.

By fish species

vertical axis — number of catches

023
3111
Largemouth bassBlack crappieBluegillStriped bass
By fish species
ValueCatchesShare
Largemouth bass350%
Black crappie117%
Bluegill117%
Striped bass117%

By month

vertical axis — number of catches

012
21111
AprMayJunJulAug
By month
ValueCatchesShare
Apr233%
May117%
Jun117%
Jul117%
Aug117%

Air temperature, °F

vertical axis — number of catches

012
222
687786
Air temperature, °F
ValueCatchesShare
68–75 °F233%
77–84 °F233%
86–93 °F233%

Pressure, inHg

vertical axis — number of catches

023
321
29.7229.9230.12
Pressure, inHg
ValueCatchesShare
29.72–29.88 inHg350%
29.92–30.08 inHg233%
30.12–30.28 inHg117%

Wind direction

5 catches have this data · vertical axis — number of catches

012
212
NSWW
Wind direction
ValueCatchesShare
N240%
SW120%
W240%

Wind speed, mph

vertical axis — number of catches

023
231
049
Wind speed, mph
ValueCatchesShare
0–2 mph233%
4–7 mph350%
9–11 mph117%