Premium ad-free surfcams, dawn surf reports, forecaster notes, long range surf forecasts... Get Swellnet PRO for $7.33 per month Premium ad-free surfcams, dawn surf reports, and more... Get Swellnet PRO for $7.33 per month

Check the 16-day forecast with Swellnet Pro for $8.95/month

Chiba South Surf Forecast

Basic // Advanced
◀
6am Thu 18 Sep
1-2ft SW 17kt SW
(Waist High)
1.1m @ 5.2s SW (229°)
0.5m @ 8.7s ESE (106°)
0.3m @ 9.8s SE (146°)
12pm Thu 18 Sep
2ft SW 17kt WSW
(Waist-Shoulder High)
1.4m @ 5.7s SW (232°)
0.4m @ 9s ESE (107°)
0.2m @ 9.5s SE (146°)
6pm Thu 18 Sep
2ft SW 12kt WSW
(Waist-Shoulder High)
1.3m @ 6s SW (229°)
0.4m @ 9.4s ESE (109°)
0.2m @ 9.4s SE (146°)
6am Fri 19 Sep
1ft SW 16kt NE
(Knee High)
2ft North-east facing beaches
(Waist-Shoulder High)
0.4m @ 6.3s SW (220°)
1.3m @ 5.7s NE (50°)
0.3m @ 8.8s ESE (111°)
12pm Fri 19 Sep
1ft ENE 13kt NE
(Knee High)
3ft North-east facing beaches
(Head High)
1.6m @ 6.5s ENE (59°)
0.2m @ 6.3s SW (220°)
0.2m @ 9.1s SE (145°)
6pm Fri 19 Sep
1ft ENE 11kt NE
(Knee High)
2-3ft North-east facing beaches
(Shoulder-Head High)
1.5m @ 7s ENE (67°)
0.3m @ 10s E (88°)
6am Sat 20 Sep
1ft ENE 9kt ENE
(Knee High)
1-2ft North-east facing beaches
(Waist High)
1.0m @ 5.9s ENE (74°)
0.3m @ 9.2s ESE (119°)
0.2m @ 8.7s SE (145°)
12pm Sat 20 Sep
1ft E 6kt ESE
(Knee High)
1ft+ North-east facing beaches
(Knee-Waist High)
0.9m @ 5.5s E (83°)
0.3m @ 9.2s ESE (119°)
0.2m @ 8.6s SE (145°)
6pm Sat 20 Sep
0.5ft E 6kt SW
(Ankle High)
1ft South facing beaches
(Knee High)
0.7m @ 5.2s E (97°)
0.3m @ 9.5s ESE (121°)
0.2m @ 8.4s SE (145°)

This is premium content for Swellnet Pro subscribers WHY?

Become a subscriber and receive access to ad-free 16 day surf forecasts and charts, detailed surf forecaster notes, dawn surf reports and premium, ad-free surfcams and replays.

Get Swellnet Pro
Thu 6am
Thu 12pm
Thu 6pm
Fri 6am
Fri 12pm
Fri 6pm
Sat 6am
Sat 12pm
Sat 6pm
Wave Height & Swell Direction
Swell Train Data
Wind Speed & Direction
A
SW 17kt
A
WSW 17kt
A
WSW 12kt
A
NE 16kt
A
NE 13kt
A
NE 11kt
A
ENE 9kt
A
ESE 6kt
A
SW 6kt
Tide Times & Weather
Late thunder 27°C // 36°C
Clearing shower 22°C // 26°C
Possible shower 21°C // 27°C
▶

Surf Forecast Swell Train Analysis

Date
Surf
Wind
Primary Swell
Secondary Swell
Tertiary Swell
-
Thu 18/09
12am
1ft+
SW 14kt
0.9 m
4.7s 224 (SW)
0.6 m
8.5s 107 (ESE)
0.3 m
10s 139 (SE)
6am
1-2ft
SW 17kt
1.1 m
5.2s 229 (SW)
0.5 m
8.7s 106 (ESE)
0.3 m
9.8s 146 (SE)
12pm
2ft
WSW 17kt
1.4 m
5.7s 232 (SW)
0.4 m
9s 107 (ESE)
0.2 m
9.5s 146 (SE)
6pm
2ft
WSW 12kt
1.3 m
6s 229 (SW)
0.4 m
9.4s 109 (ESE)
0.2 m
9.4s 146 (SE)
+
Thu 18/09
2ft
WSW 17kt
1.4 m
5.7s 232 (SW)
0.4 m
9s 107 (ESE)
0.2 m
9.5s 146 (SE)
-
Fri 19/09
12am
1ft+
NNE 12kt
0.8 m
6.1s 230 (SW)
0.4 m
8.8s 112 (ESE)
0.3 m
10.5s 88 (E)
6am
1ft
2ft
NF
NE 16kt
0.4 m
6.3s 220 (SW)
1.3 m
5.7s 50 (NE)
0.3 m
8.8s 111 (ESE)
12pm
1ft
3ft
NF
NE 13kt
1.6 m
6.5s 59 (ENE)
0.2 m
6.3s 220 (SW)
0.2 m
9.1s 145 (SE)
6pm
1ft
2-3ft
NF
NE 11kt
1.5 m
7s 67 (ENE)
0.3 m
10s 88 (E)
+
Fri 19/09
1ft
3ft
NF
NE 13kt
1.6 m
6.5s 59 (ENE)
0.2 m
6.3s 220 (SW)
0.2 m
9.1s 145 (SE)
-
Sat 20/09
12am
1ft
2ft
NF
NE 9kt
1.2 m
6.4s 70 (ENE)
0.2 m
9.9s 88 (E)
6am
1ft
1-2ft
NF
ENE 9kt
1.0 m
5.9s 74 (ENE)
0.3 m
9.2s 119 (ESE)
0.2 m
8.7s 145 (SE)
12pm
1ft
1ft+
NF
ESE 6kt
0.9 m
5.5s 83 (E)
0.3 m
9.2s 119 (ESE)
0.2 m
8.6s 145 (SE)
6pm
0.5ft
1ft
SF
SW 6kt
0.7 m
5.2s 97 (E)
0.3 m
9.5s 121 (ESE)
0.2 m
8.4s 145 (SE)
+
Sat 20/09
1ft
1ft+
NF
ESE 6kt
0.9 m
5.5s 83 (E)
0.3 m
9.2s 119 (ESE)
0.2 m
8.6s 145 (SE)
  • bulletin_datetime_utc => 2025-09-17 18:00:00
  • location_identifier => 242
  • timezone => Asia/Tokyo