Mera surfForecast / Chiba / Japan

information circle48hr Weather and Surf, issued 2 am Wednesday 20 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
20.9° C
(Which is normal for this time of year)

How big are the waves at Mera today?

The current surf forecast for Mera at 7AM is: 0.9m 10s primary swell from a East-southeast direction and 0.8m 4s secondary swell from a South-southwest direction (forecast issued at 02:00am May 20). An open ocean swell of 0.1m 9s is not directed at the surf break. The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (20 May)3ft (0.9m)10s
Afternoon (20 May)3.5ft (1.0m)10s
Evening (20 May)3ft (0.9m)10s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Moderate rain (total 15mm), heaviest on Thu night. Warm (max 22°C on Wed night, min 14°C on Fri afternoon). Mainly strong winds.

Wednesday
20
Thursday
21
Friday
22
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
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.8
SE
10
1.1
SE
10
0.9
ESE
10
0.9
ESE
10
1
SE
10
1
SE
10
1
SE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
2.1
SSW
6
2.2
SSW
7
3
SW
7
2.4
SW
7
2.1
SW
7
1.5
SSW
8
1.2
SSW
7
1.1
S
7
1.3
SSW
8
1.1
SW
8
0.9
SSW
8
0.6
SW
8
0.5
SW
8
Wave Graph
Metric surfscale
Energy kJ
136
229
175
171
192
188
181
157
157
142
145
361
453
808
612
492
234
156
124
203
140
103
51
35
Wind (km/h)
25
SSW
30
SW
25
SW
25
SW
30
SW
30
SSW
30
SW
30
SW
25
SW
25
SW
25
SSW
30
SW
40
SW
45
SW
45
SW
20
WSW
25
NNE
35
NNE
40
N
45
N
45
NNE
45
NNE
45
NNE
45
NNE
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
cross-on
off
off
cross-off
cross-off
cross-off
cross-off
cross-off
off
High Tide
5:28AM1.45m
8:25PM1.29m
6:11AM1.37m
9:21PM1.22m
7:00AM1.27m
Low Tide
00:19AM0.94m
12:59PM-0.13m
1:04AM0.96m
1:49PM-0.01m
1:57AM0.95m
2:43PM0.14m
cloud
part cloud
clear
part cloud
clear
part cloud
part cloud
cloud
part cloud
cloud
cloud
rain showers
light rain
cloud
light rain
light rain
light rain
light rain
light rain
light rain
light rain
light rain
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:33
4:33
4:33
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:39
6:39
6:40
1
1
1
3
3
1
1
2
1
1
Temp °C
20
20
20
20
21
21
21
21
22
22
22
22
22
22
22
20
18
16
16
15
15
14
15
15
18
18
18
18
19
18
19
19
22
21
21
20
18
17
17
19
15
11
10
7
7
6
7
7
Swell 1
Height (m)
Direction
Period (s)
0.8
SE
10
1.1
SE
10
0.9
ESE
10
0.9
ESE
10
1
SE
10
1
SE
10
1
SE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.9
ESE
10
0.8
ESE
10
0.8
ESE
10
0.7
ESE
10
0.7
ESE
10
0.6
ESE
10
1.5
SSW
8
1.2
SSW
7
1.1
S
7
1.3
SSW
8
1.1
SW
8
0.9
SSW
8
0.6
SW
8
0.5
SW
8
Energy kJ
136
229
175
171
192
188
181
157
157
142
145
103
105
83
83
74
234
156
124
203
140
103
51
35
Swell 2
Height (m)
Direction
Period (s)
0.6
E
10
0.1
NE
9
0.1
NE
9
0.1
NE
9
0.1
NE
9
0.1
NE
8
0.1
NE
8
0.1
NE
8
0.1
NE
8
0.1
NE
8
0.1
NE
8
0.1
NE
8
0.1
NE
8
0.1
NE
8
0.1
NE
8
0.1
E
8
1.1
WSW
8
1
WSW
8
0.9
WSW
8
0.5
ESE
9
0.5
ESE
10
0.4
ESE
10
0.4
SSE
7
0.4
SSE
6
Energy kJ
77
3
3
3
3
3
3
3
3
3
2
2
2
2
2
1
153
136
114
50
54
38
15
14
Swell 3
Height (m)
Direction
Period (s)
0.1
NE
9
0.3
NE
9
0.3
NE
9
0.1
NE
12
0.1
E
11
0.5
ESE
10
0.5
ESE
10
0.5
ESE
10
0.1
NW
7
0.3
SSW
7
Energy kJ
3
13
13
5
2
54
52
54
2
10
Wind waves
Height (m)
Direction
Period (s)
0.6
SW
3
0.7
SW
4
0.9
SSW
4
0.8
SSW
4
0.7
SW
4
0.7
SW
4
0.6
SW
4
0.6
SW
4
0.7
SSW
4
0.9
SSW
5
1.2
S
6
2.1
SSW
6
2.2
SSW
7
3
SW
7
2.4
SW
7
2.1
SW
7
0.6
NNE
3
1.1
NE
5
1.3
NE
7
1.7
NE
7
2.1
NE
6
2.4
NE
8
2.4
NE
9
Energy kJ
7
13
25
21
15
14
12
11
13
37
89
361
453
808
612
492
6
58
159
301
278
800
926
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
2
2
2
1
1
1
1
1
1
1
2
3
3
3
1
2
1
1
1
1
1
Distance (km)
73
73
73
204
204
204
88
73
73
87
88
125
125
61
36
33
77
153
483
483
517
500
501
563
Best forecast wave conditions in Chiba
Rating
(10 max)
1
1
2
3
3
Best forecast wave conditions in Japan
Rating
(10 max)
1
1
2
2
2
2
2
1
2
2
2
2
2
2
3
3
4
4
2
2
2
1
1
1
Header Global
Rating
(10 max)
4
4
4
5
5
5
4
4
4
5
5
4
4
5
5
4
4
4
4
5
5
5
7
8
  • 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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