Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 12 Oct 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
27.1°C
0.2° 

Ammonias surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Ammonias surf forecast from 13 Oct 2026:

  • Most powerful swell: Monday 19 Oct, 2AM (local time) - 7ft (2.2m), 8s period, ENE swell with 540 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.2m 8s and forecast to arrive on Monday (Oct 19) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 13s period and expected on Sunday (Oct 18) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Mon 19th Oct)7ft (2.2m) 8s

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


Short Range Forecast

Mostly dry. Warm (max 26°C on Tue morning, min 24°C on Mon night). Wind will be generally light.

Days 5-7 Weather Summary

Moderate rain (total 16mm), heaviest on Fri night. Warm (max 26°C on Fri morning, min 24°C on Thu night). Mainly fresh winds.

Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sunday
18
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
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.8
S
14
0.7
S
13
0.7
S
13
0.7
S
13
0.6
S
12
0.5
S
21
0.6
S
20
0.6
S
19
0.6
S
18
1.6
ENE
6
1.6
ENE
6
1.7
ENE
6
2
ENE
6
1.9
ENE
7
1.6
ENE
7
2.2
ENE
7
2.2
ENE
7
2
ENE
7
2.2
ENE
8
Wave Graph
Metric surfscale
Energy kJ
264
167
167
165
98
216
271
270
224
205
197
220
340
348
237
462
512
415
540
Wind (km/h)
15
ENE
20
E
15
E
15
ENE
20
ENE
20
ENE
20
ENE
25
ENE
20
ENE
25
ENE
30
ENE
30
NE
25
ENE
30
ENE
25
ENE
30
ENE
25
ENE
30
ENE
25
ENE
Wind State
cross-on
cross-on
cross-on
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
cross-on
High Tide
5:25AM0.63m
4:09PM0.27m
6:07AM0.62m
4:13PM0.24m
6:58AM0.59m
8:03AM0.56m
9:18AM0.55m
10:04PM0.19m
10:27AM0.54m
11:33PM0.23m
Low Tide
9:52PM0.02m
12:23PM0.21m
10:17PM0.04m
1:40PM0.23m
10:44PM0.07m
11:17PM0.10m
00:02AM0.14m
7:26PM0.18m
1:24AM0.17m
6:57PM0.17m
3:13AM0.19m
clear
part cloud
part cloud
clear
clear
clear
clear
part cloud
clear
rain showers
clear
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
—
6:31
—
—
6:33
—
—
6:33
—
—
6:33
—
—
6:33
—
—
6:33
—
—
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:15
—
6:14
—
—
6:13
—
—
6:12
—
—
6:10
—
—
6:10
—
—
6:09
—
 mm
—
—
—
—
—
—
—
—
—
1
—
1
7
1
1
2
—
3
2
Temp °C
25
26
26
25
25
26
24
26
26
25
26
26
25
26
25
25
25
25
24
Feels °C
27
27
27
26
25
26
23
25
25
24
24
25
24
24
23
22
24
23
22
  • 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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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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