Osaka Japan · Japan

Osaka Bay Japan fishing forecast

77 Fair of 100

Osaka Bay Japan is a saltwater fishing spot in Osaka Japan, Japan. Anglers here target Japanese Amberjack, Yellowfin Tuna. The most productive months are typically May, June, July, August, September, October.

Quick answer

Best monthsMay, June, July, August

Top speciesJapanese Amberjack, Yellowfin Tuna

Score now77/100

Local rules日本 (Japan)

Today’s verdict

Ranks #146 of 437 spots FishRadar scored worldwide today

Trending up — 13 points above 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

Water temperature+23.5Waves+9.0Wind+8.0

Pressure trend

Pressure data unavailable

Best window today

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

Next solunar peak

minor 07:50

Current conditions

Sea surface temp	27.7 °C
Wind	12 km/h from ENE, gusting 30 km/h
Wave height	0.3 m at 4 s
Current	0.02 m/s toward E
Pressure	1003 hPa
Depth	61 m
Cloud cover	100%
Chlorophyll	6.92 mg/m³
Salinity	29.6 PSU
Mixed-layer depth	11 m
UV index	3
Precipitation (24h)	0.7 mm
Wind sea	0.1 m at 1 s
Ground swell	0.2 m at 4 s from S
Current shear (surface vs 50 m)	0.02 → 0.00 m/s

The water here is 4.1 °C warmer than the September average of 23.6 °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 Osaka Bay Japan

Osaka Bay Japan currently scores 77 out of 100 (Fair). Water temperature is 27.7 °C. 8 forecast signals are active in this score.

Water temperature +23.5: how close the water is to this species mix’s comfort band
Waves +9.0: swell energy stirring the water column
Wind +8.0: surface chop, oxygen and bait drift
Chlorophyll +5.4: plankton density — the base of the food chain
Chlorophyll front +5.0: a plankton edge — classic feeding line
Barometric pressure +3.3: falling pressure often triggers feeding

What’s biting now

The model expects today: thread-sail-filefish, japanese-spanish-mackerel, japanese-seabass, japanese-flathead, swordfish, pacific-bluefin-tuna, silver-pomfret, albacore

Bite windows

Moon

Waning Crescent · 14% lit

Solunar day rating

50 / 100

Best months for Osaka Bay Japan:

Score history at this spot

30 days tracked at this exact location

Best recent day: 2026-08-13, 83/100

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

+16 points vs the same day last week

About this spot

Water type

Bay

Bays are sheltered and usually calmer than open water, offering protected fishing and holding structure for inshore species.

Approximate bottom depth: 61 m

Access & shore

Fishable from shore · harbor

What you can catch

Japanese Amberjack

Seriola quinqueradiata
Yellowfin Tuna

Thunnus albacares

Best months by species at Osaka Bay Japan

Japanese AmberjackSeriola quinqueradiata
Yellowfin TunaThunnus albacares

Typical months; local seasons and closures apply.

Local regulations

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

日本 (Japan)

Species	Bag limit	Min size	Open season
Japanese Amberjack都道府県漁業調整規則（採捕する水産動植物の魚種ごとの大きさの制限）	—	—	—
The Fisheries Agency publishes NO national bag limit or minimum size for buri. Size limits, closed periods, prohibited areas and permitted gear for recreational fishing are set by the PREFECTURAL fisheries adjustment rule (都道府県漁業調整規則) for the waters you are fishing, and local fisheries cooperatives may add voluntary measures. The "5 per day / 40 cm" this pack previously published had no source and has been withdrawn. Check the prefecture (都道府県) and the local 漁業協同組合 before fishing.

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.