Shiga Japan · Japan

Lake Biwa Japan fishing forecast

62 Good of 100

Lake Biwa Japan is a freshwater fishing spot in Shiga Japan, Japan. Anglers here target Largemouth Bass, Smallmouth Bass, Pike-perch. The most productive months are typically April, May, June, July, August, September, October.

Quick answer

Best monthsApril, May, June, July

Top speciesLargemouth Bass, Smallmouth Bass, Pike-perch

Score now62/100

Local rules日本 (Japan)

Today’s verdict

Ranks #307 of 437 spots FishRadar scored worldwide today

Trending down — 3 points below this spot’s 7-day average

Score confidence ±4 points, from 8 live signals

The statistical model disagrees with the physics model here today — treat this score with extra caution.

Helping the score most

Waves+15.0Water temperature+12.0Wind+12.0

Pressure trend

Pressure data unavailable

Best window today

05:00 · Light wind (0 km/h) and calm seas

Next solunar peak

minor 07:47

Current conditions

Sea surface temp	28.7 °C
Wind	11 km/h from ENE, gusting 23 km/h
Current	0.01 m/s toward SE
Pressure	1005 hPa
Cloud cover	100%
Chlorophyll	4.45 mg/m³
Salinity	0.0 PSU
Mixed-layer depth	10 m
UV index	2
Precipitation (24h)	0.3 mm
Wind sea	0.0 m
Ground swell	0.0 m at 0 s

The water here is 5.4 °C warmer than the September average of 23.3 °C. Warmer-than-normal water pushes cool-water species deeper and brings warm-water species in earlier than the calendar suggests. The water is mixed to about 26.7 m, with the thermocline below that.

Updated 1 h ago.

What the score means at Lake Biwa Japan

Lake Biwa Japan currently scores 62 out of 100 (Good). Water temperature is 28.7 °C. 8 forecast signals are active in this score.

Waves +15.0: swell energy stirring the water column
Water temperature +12.0: how close the water is to this species mix’s comfort band
Wind +12.0: surface chop, oxygen and bait drift
Barometric pressure +4.4: falling pressure often triggers feeding
Pre-storm bite +2.4: the classic feed before heavy weather
Moon phase +2.1: lunar feeding rhythm

What’s biting now

The model expects today: biwa-trout, ayu-sweetfish, black-carp, japanese-eel, northern-snakehead, pale-chub, dark-chub, silver-carp

[object Object] — Protected here — release immediately

Bite windows

Moon

Waning Crescent · 14% lit

Solunar day rating

50 / 100

Best months for Lake Biwa Japan:

Score history at this spot

30 days tracked at this exact location

Best recent day: 2026-08-23, 76/100

5 day(s) at 70+ in the tracked period

8 points below the same day last week

About this spot

Water type

Lake · Freshwater

Lakes have no tide, so target structure, drop-offs, and seasonal thermoclines where fish concentrate by depth and temperature.

Access & shore

Fishable from shore · beach

What you can catch

Largemouth Bass

Micropterus salmoides
Smallmouth Bass

Micropterus dolomieu
Pike-perch

Sander lucioperca

Best months by species at Lake Biwa Japan

Largemouth BassMicropterus salmoides
Smallmouth BassMicropterus dolomieu
Pike-perchSander lucioperca

Typical months; local seasons and closures apply.

Local regulations

Fisheries Agency of Japan (水産庁, Suisan-chō)

日本 (Japan)

Licensing:

saltwater-recreational — residents No general national licence for shore-based recreational sea fishing. What binds you is the prefectural fisheries adjustment rule (都道府県漁業調整規則): permitted gear and methods, prohibited areas, closed periods, per-species size limits and restrictions on fishing under lights are all set there. Do not enter posted commercial fishing-rights areas (漁業権). Recreational bluefin tuna additionally requires a national notification — see the species rule., non-residents Same rules apply. Tourists fishing from a charter boat fish under the operator's arrangements, but the prefectural rules still bind the angler. The Fisheries Agency publishes a leaflet for foreign recreational fishers.
freshwater-recreational — residents Inland fishing requires a "yugyoken" (遊漁券) issued by the local fisheries cooperative for the specific river or lake, sold per-day or per-season at tackle shops and convenience stores near the water., non-residents Same yugyoken requirement applies to visitors.

FishRadar regulations are summaries for informational purposes only. Japanese recreational fishing rules are set at the prefectural level (都道府県漁業調整規則) and vary between neighbouring prefectures. Always verify with the prefecture and the local fisheries cooperative (漁業協同組合) before fishing, and never enter posted commercial fishing-rights zones. Bluefin tuna rules change during the season without notice — check the Fisheries Agency page on the day you fish.