Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 13 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.6° C
0.1° 

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


Ammonias surf forecast from 14 Aug 2026:

  • Most powerful swell: Sunday 16 Aug, 5AM (local time) - 11ft (3.5m), 9s period, E swell with 1,918 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 3.5m 9s and forecast to arrive on Sunday (Aug 16) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 7s period and expected on Wednesday (Aug 19) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5AM (Sun 16th Aug)11ft (3.5m) 9s

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


Short Range Forecast

Light rain (total 8mm), mostly falling on Fri night. Warm (max 27°C on Thu morning, min 25°C on Thu night). Mainly fresh winds.

Days 4-6 Weather Summary

Moderate rain (total 16mm), heaviest on Sun night. Warm (max 26°C on Sun afternoon, min 24°C on Mon night). Mainly fresh winds.

Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
Wednesday
19
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
2
1
0
0
1
1
1
1
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)
1.4
S
16
1.3
S
15
1.3
S
15
1.2
S
14
2
ENE
8
2.2
ENE
8
2.5
ENE
8
3
ENE
9
3.5
E
9
3.5
E
9
3.5
ENE
8
2.4
ENE
8
2
ENE
8
1.7
ENE
7
0.8
S
14
1.3
ENE
7
1.3
ENE
7
0.6
S
13
1.2
ENE
7
1.1
ENE
7
0.5
SW
16
Wave Graph
Metric surfscale
Energy kJ
1004
784
743
598
496
570
979
1162
1787
1787
1565
725
438
314
232
165
154
112
128
127
130
Wind (km/h)
25
NE
25
NE
25
NE
30
ENE
25
NE
30
NE
30
NE
35
NE
35
ENE
35
ENE
30
ENE
30
E
25
ENE
25
ENE
20
ENE
25
ENE
20
ENE
15
ENE
20
ENE
20
ENE
15
NE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-on
cross
cross
High Tide
4:34PM0.66m
4:44AM0.37m
5:03PM0.59m
5:36AM0.41m
5:29PM0.52m
6:32AM0.43m
5:50PM0.44m
7:34AM0.46m
6:01PM0.36m
8:46AM0.48m
5:31PM0.30m
10:06AM0.50m
Low Tide
9:30AM-0.00m
11:09PM0.08m
10:17AM0.05m
11:35PM0.07m
11:06AM0.12m
00:00AM0.06m
12:01PM0.20m
00:26AM0.06m
1:11PM0.26m
00:55AM0.06m
3:13PM0.30m
1:28AM0.08m
2:14AM0.09m
clear
clear
part cloud
part cloud
part cloud
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
mod rain
light rain
part cloud
clear
clear
part cloud
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:15
6:15
6:15
6:16
6:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:08
7:08
7:07
7:07
7:06
7:06
7:05
 mm
1
1
2
4
2
4
7
3
Temp °C
27
27
25
26
27
26
26
26
26
25
26
25
25
26
25
26
26
25
26
26
25
Feels °C
26
25
25
25
25
25
26
25
25
24
25
24
25
26
25
26
26
26
27
26
25
  • 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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