Mera surfForecast / Chiba / Japan

information circle48hr Weather and Surf, issued 8 am Monday 18 May 2026 JST
Forecast update in hr  min  s Forecast update imminent
Mera surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Mera sea temperature is
19.4° C
(Which is 1.4°C colder than average for this time of year)

How big are the waves at Mera today?

The current surf forecast for Mera at 3PM is: 1.0m 9s primary swell from a East direction and 0.4m 7s secondary swell from a Southeast direction (forecast issued at 08:00am May 18). The wind direction is predicted to be cross-onshore.

Time (JST) & DateWave HeightWave Period
Morning (18 May)3.5ft (1.1m)8s
Afternoon (18 May)3.5ft (1.0m)9s
Evening (18 May)3ft (0.9m)8s

Table - waves today at Mera. (Swell directed towards the surf break)


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Some drizzle, heaviest during Wed night. Warm (max 21°C on Mon morning, min 18°C on Wed night). Winds decreasing (fresh winds from the SSW on Tue afternoon, calm by Wed night).

Monday
18
Tuesday
19
Wednesday
20
Thu
21
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
12 AM
3 AM
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
12 AM
3 AM
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
12 AM
3 AM
Rating
(10 max)
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
1.1
ESE
8
1.1
ESE
8
1
ESE
9
1
E
9
0.9
ESE
9
0.9
ESE
8
0.8
ESE
8
0.8
E
9
0.6
SE
11
0.6
SE
11
0.7
SE
10
0.7
SE
11
0.7
SE
10
0.8
SE
10
0.9
ESE
10
0.9
ESE
10
1
SE
10
0.8
SE
10
0.9
ESE
10
1
SE
10
0.9
ESE
10
1
SE
10
0.9
ESE
9
0.9
ESE
10
Wave Graph
Metric surfscale
Energy kJ
180
180
166
158
129
118
94
99
92
92
108
110
102
115
178
175
196
124
171
188
161
177
154
157
Wind (km/h)
5
ENE
5
SE
15
S
20
SSW
20
SSW
20
SSW
20
SSW
20
SSW
20
SSW
20
SW
25
SSW
30
SSW
25
SSW
25
SSW
25
SW
25
SW
20
SW
20
SW
20
SW
20
SSW
20
SW
15
SW
10
WSW
0
NNW
cross-off
cross
cross-on
cross-on
cross-on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
glassy
High Tide
4:13AM1.48m
6:39PM1.41m
4:50AM1.48m
7:31PM1.35m
5:28AM1.45m
8:25PM1.29m
Low Tide
11:26AM-0.23m
11:38PM0.90m
12:12PM-0.21m
00:19AM0.94m
12:59PM-0.13m
1:04AM0.96m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
cloud
part cloud
cloud
cloud
cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:35
4:35
4:33
4:33
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:37
6:38
6:39
6:39
Temp °C
20
20
21
21
21
20
20
19
19
20
20
20
20
20
20
20
19
20
21
21
21
20
20
20
19
20
21
20
20
19
19
18
18
18
18
17
18
18
18
18
18
19
20
21
21
21
22
23
Swell 1
Height (m)
Direction
Period (s)
1.1
ESE
8
1.1
ESE
8
1
ESE
9
1
E
9
0.9
ESE
9
0.9
ESE
8
0.8
ESE
8
0.8
E
9
0.7
E
9
0.7
E
9
0.7
SE
10
0.7
SE
11
0.7
SE
10
0.8
SE
10
0.9
ESE
10
0.9
ESE
10
1
SE
10
0.8
SE
10
0.9
ESE
10
1
SE
10
0.9
ESE
10
1
SE
10
0.9
ESE
9
0.9
ESE
10
Energy kJ
180
180
166
158
129
118
94
99
78
81
108
110
102
115
178
175
196
124
171
188
161
177
154
157
Swell 2
Height (m)
Direction
Period (s)
0.1
NE
11
0.1
NE
10
0.4
SE
8
0.4
SE
7
0.4
SSE
7
0.4
SE
10
0.4
SE
11
0.6
SE
10
0.6
SE
11
0.6
SE
11
0.7
E
9
0.7
E
9
0.6
E
9
0.6
E
10
0.1
NE
9
0.1
NE
9
0.1
NE
9
0.6
E
10
0.1
NE
9
0.1
NE
8
0.1
NE
8
0.1
NE
8
0.1
NE
8
0.1
NE
8
Energy kJ
5
4
14
14
21
36
40
80
92
92
78
79
60
77
3
3
3
70
3
3
3
3
3
2
Swell 3
Height (m)
Direction
Period (s)
0.4
SE
7
0.1
NE
10
0.3
SE
10
0.3
SE
10
0.4
SE
7
0.3
SSE
7
0.1
NE
9
0.1
NE
9
0.1
NE
9
0.1
NE
9
0.1
NE
9
0.1
NE
9
0.1
NE
9
0.1
NE
9
0.1
S
8
0.1
S
8
0.1
S
8
0.1
S
8
Energy kJ
14
4
16
16
13
9
3
3
3
3
3
3
3
3
1
1
1
1
Wind waves
Height (m)
Direction
Period (s)
0.3
SW
2
0.4
SW
3
0.4
SW
3
0.4
SW
3
0.4
SW
3
0.4
SW
3
0.5
SW
3
0.6
SW
4
0.6
SW
4
0.6
SW
4
0.7
WSW
4
0.5
WSW
4
0.6
WSW
3
0.5
SW
4
0.4
SW
3
0.3
SW
3
0.3
E
2
Energy kJ
1
2
2
3
2
3
5
10
11
10
12
7
8
6
3
1
1
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Distance (km)
0
36
64
64
64
87
87
73
73
87
529
529
73
73
73
73
70
36
74
74
70
64
12
0
Best forecast wave conditions in Chiba
Rating
(10 max)
2
1
1
1
1
1
1
1
1
1
1
1
1
Best forecast wave conditions in Japan
Rating
(10 max)
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
3
2
Header Global
Rating
(10 max)
4
4
4
7
5
4
5
5
5
4
4
4
4
4
4
4
4
4
5
4
4
5
5
5
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

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