Ammonias surfForecast / HAW – Kaua'i / USA

information circle16 Day Weather and Surf, issued 1 am Wednesday 20 May 2026 HST
Forecast update in hr  min  s Forecast update imminent
Ammonias surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Ammonias sea temperature is
25.2° C
(Which is normal for this time of year)

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 3.0m 9s and forecast to arrive on Friday (May 22) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 12s period and expected on Wednesday (May 20) at 8AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Fri 22nd May)10ft (3.0m) 9s

Table - best surf conditions forecast for Ammonias over the next 16 days.


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Light rain (total 6mm), mostly falling on Wed morning. Warm (max 24°C on Wed morning, min 22°C on Thu night). Mainly fresh winds.

Days 4-6 Weather Summary

Moderate rain (total 12mm), heaviest on Sat morning. Warm (max 24°C on Sun morning, min 23°C on Sat morning). Mainly fresh winds.

Wednesday
20
Thursday
21
Friday
22
Saturday
23
Sunday
24
Monday
25
Tuesday
26
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.9
ENE
8
2.2
ENE
8
2.3
ENE
8
2.5
ENE
8
2.5
ENE
8
3
ENE
9
2.5
ENE
9
2.4
ENE
9
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.2
ENE
9
2.4
ENE
8
2.1
ENE
8
2.3
ENE
8
2.3
ENE
8
2
ENE
8
1.9
ENE
8
1.8
ENE
8
2
ENE
7
Wave Graph
Metric surfscale
Energy kJ
438
556
719
893
847
1150
975
867
870
844
953
1057
698
808
621
705
696
508
432
372
417
Wind (km/h)
25
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
NE
30
NE
30
ENE
30
ENE
30
ENE
25
NE
25
ENE
30
ENE
25
ENE
30
ENE
30
ENE
25
ENE
25
ENE
30
ENE
25
ENE
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross
High Tide
7:36PM0.62m
7:44AM0.13m
8:32PM0.57m
9:38AM0.17m
9:27PM0.51m
11:10AM0.24m
10:17PM0.45m
12:15PM0.33m
11:02PM0.39m
1:03PM0.41m
11:43PM0.33m
1:43PM0.49m
00:22AM0.27m
Low Tide
11:26AM-0.04m
3:37AM0.08m
12:26PM0.03m
4:25AM0.06m
1:41PM0.10m
5:01AM0.04m
3:18PM0.16m
5:30AM0.02m
5:07PM0.20m
5:54AM-0.01m
6:46PM0.21m
6:17AM-0.03m
8:07PM0.19m
rain showers
rain showers
rain showers
clear
clear
part cloud
part cloud
rain showers
rain showers
rain showers
rain showers
clear
rain showers
clear
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:56
5:56
5:54
5:54
5:54
5:54
5:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:10
7:12
7:12
7:13
7:13
7:13
7:14
1
1
2
1
1
1
1
1
1
2
2
4
2
2
1
Temp °C
24
24
24
24
24
23
24
24
23
23
23
23
24
24
24
24
24
23
24
24
23
23
22
23
21
21
19
20
21
19
20
19
20
22
21
22
22
21
21
22
22
21
Swell 1
Height (m)
Direction
Period (s)
0.6
SSW
14
0.6
SSW
14
0.5
SSW
13
0.5
S
16
0.6
S
16
0.6
S
15
0.5
S
15
0.5
S
14
0.6
S
16
0.5
S
16
0.7
S
15
0.6
S
15
0.6
S
14
0.5
S
13
0.6
S
14
0.4
S
12
0.6
S
14
0.5
S
13
0.5
S
12
0.4
S
12
0.5
S
15
Energy kJ
165
152
101
134
181
157
109
94
188
125
218
155
132
92
140
49
132
83
77
47
106
Swell 2
Height (m)
Direction
Period (s)
0.4
NNW
11
0.3
NNW
11
0.4
SSW
17
0.4
SSW
14
0.4
SE
13
0.4
SE
13
0.4
SE
12
0.5
S
18
0.5
S
13
0.4
SSW
13
0.3
NNW
15
0.4
NW
13
0.4
NW
12
0.3
S
16
0.3
NW
11
0.4
S
15
0.3
SE
9
0.4
SE
7
0.3
SE
9
0.4
S
16
0.4
S
12
Energy kJ
41
23
93
61
44
42
36
154
90
57
42
44
37
46
19
68
13
11
12
79
44
Swell 3
Height (m)
Direction
Period (s)
0.3
SSW
18
0.3
SSW
18
0.4
SE
7
0.4
SE
14
0.3
SSW
12
0.2
SSW
12
0.4
S
18
0.4
SE
8
0.4
SE
12
0.4
SE
12
0.3
SE
10
0.3
SE
12
0.3
S
16
0.3
NW
12
0.1
SE
11
0.2
NNW
11
0.2
NNW
10
0.3
S
16
0.3
S
16
0.4
SE
6
0.4
NW
14
Energy kJ
64
62
13
46
28
14
102
17
36
35
15
21
46
22
5
11
11
47
47
10
51
Wind waves
Height (m)
Direction
Period (s)
1.9
ENE
8
2.2
ENE
8
2.3
ENE
8
2.5
ENE
8
2.5
ENE
8
3
ENE
9
2.5
ENE
9
2.4
ENE
9
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.2
ENE
9
2.4
ENE
8
2.1
ENE
8
2.3
ENE
8
2.3
ENE
8
2
ENE
8
1.9
ENE
8
1.8
ENE
8
2
ENE
7
Energy kJ
438
556
719
893
847
1150
975
867
870
844
953
1057
698
808
621
705
696
508
432
372
417
Nearest Offshore or Glassy
Rating
(10 max)
3
3
1
3
1
4
3
3
3
3
1
1
3
1
3
2
3
1
1
2
1
Distance (km)
31
33
299
38
302
31
31
33
31
31
330
16
31
299
16
38
46
16
31
126
31
Best forecast wave conditions in Kaua'i
Rating
(10 max)
3
3
3
4
3
3
3
3
1
3
3
2
3
1
1
1
Best forecast wave conditions in United States
Rating
(10 max)
3
3
3
3
1
4
3
3
3
3
2
3
3
1
3
2
3
3
1
2
3
Header Global
Rating
(10 max)
4
5
5
5
5
7
6
5
5
9
6
5
5
4
4
5
5
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)
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Information about the Ammonias Surf forecast

The above surf forecast table for Ammonias provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ammonias can be found by selecting the local surf guide option on the grey menu. Our Ammonias surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Ammonias) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Ammonias may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Are you planning a vacation in Kaua'i? If you are looking for accommodation near Ammonias, camping, hotels and condos and appartments in Kaua'i, consider staying in Nawiliwili which is 2 km (1 miles) away. Alternatively, find information about places to stay and car hire in Lihue - Kauai which is 3 km (2 miles) away

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