Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 14 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.3° 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 15 Jul 2026:

  • Most powerful swell: Tuesday 21 Jul, 5PM (local time) - 3.5ft (1.0m), 14s period, S swell with 395 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.0m 14s and forecast to arrive on Tuesday (Jul 21) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 8s period and expected on Wednesday (Jul 15) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5PM (Tue 21st Jul)3.5ft (1.0m) 14s

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


The Lowdown

Alright, Rusty here. Let’s have a look at what’s cooking for Ammonias over the next couple of weeks.

To be straight with you, the next week and a half is a bit of a grind. The surf quality is just not there for a proper paddle session. The wave energy is moderate at best, with the combined energy reading around 229 (moderate) on the 14th, but it’s a messy cross-shore wind with a cross-chop, and the swell is only 2ft from the SW. Water temp is bang on average for this time of year at 79°, so you won’t need a thick suit, but you will need patience.

Tuesday the 14th through to the morning of Sunday the 19th is a stretch of poor surf conditions. The wind stays cross-on or cross-shore, and the swell is small and weak. The best of that rough patch is maybe Sunday afternoon the 19th, where the swell bumps up to 5ft from the ENE, but the period is a short 8 seconds, and the combined energy hits 555 (moderate). The wind is cross-shore, so it’s still a bit of a mess. It’s only a marginal call, and honestly, it’s not worth getting excited about.

Then we hit a pretty big gap. From Monday the 20th right through to Saturday the 26th, the conditions are consistently poor to marginal. The swell is mostly small, under 3ft, and the wind is almost always onshore or cross-shore. The only faint glimmer is on the 22nd, where the swell period jumps to 24 seconds from the SSW, but it’s only 2ft. That’s a very long period groundswell, which would normally be beautiful, but with such a tiny wave and cross-shore winds, it’s just a tease. The combined energy does climb to 1015 (strong) on the 22nd afternoon, but the wave quality is still poor.

The standout for the whole outlook is Sunday the 26th. On the morning of the 26th, the swell picks up to 6ft from the ENE with a short period of 8 seconds, and the combined energy is 1151 (strong). The wind is cross-shore, so it’s a bit rough, but it’s the biggest surf of the entire 16 days. The afternoon of the 26th sees a 3ft S swell with a 17-second period and combined energy of 1162 (strong), but again, the wind is cross-shore. This is the most energy we see, but it’s not clean. If you’re an expert who can handle a bit of chop, that morning might be your best bet, but it’s not a classic day.

After that, Monday the 27th and Tuesday the 28th are still marginal, with the swell sticking around 6ft on the 28th afternoon, but the wind is cross-shore or cross-on. The window closes pretty quickly after that, with the surf dropping back to small and weak by the 29th.

So, the honest truth is, there’s no real standout clean session here. The best on offer is the 26th, but it’s a messy, powerful day for experts only. For everyone else, it’s a waiting game. Forecasts can change, so keep an eye on it, but right now, I’d be checking the kite gear if you’re into that, because the beach breaks are going to be blown out.

Rusty.

Short Range Forecast

Moderate rain (total 14mm), heaviest on Wed night. Warm (max 26°C on Wed afternoon, min 23°C on Tue night). Wind will be generally light.

Days 5-7 Weather Summary

Some drizzle, heaviest during Sun morning. Warm (max 26°C on Fri afternoon, min 23°C on Sun night). Wind will be generally light.

Tue
14
Wednesday
15
Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
Rating
(10 max)
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.7
SW
14
0.6
SSW
17
0.7
SW
13
0.6
SSW
18
0.8
SSW
16
0.7
SSW
16
0.6
SSW
17
0.7
SSW
14
1.4
ENE
7
0.6
SSW
16
1.5
ENE
7
0.7
SSW
14
0.7
SSW
14
1.6
E
6
1.7
E
8
1.6
ENE
8
0.5
S
18
1.2
ENE
7
0.6
S
16
0.6
S
15
0.9
S
15
Wave Graph
Metric surfscale
Energy kJ
186
197
162
216
314
237
195
192
175
196
210
204
210
209
332
283
162
157
188
163
348
Wind (km/h)
20
NE
15
NE
15
E
15
E
10
ENE
20
E
20
ENE
25
ENE
20
ENE
25
ENE
20
ENE
25
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
NE
20
ENE
25
NE
20
ENE
20
ENE
Wind State
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-on
cross
cross-on
cross-on
cross
cross
cross
cross
cross
cross-on
High Tide
4:29PM0.77m
3:58AM0.23m
5:08PM0.73m
4:55AM0.26m
5:45PM0.67m
5:57AM0.28m
6:18PM0.59m
7:07AM0.31m
6:48PM0.51m
8:26AM0.35m
7:13PM0.43m
9:50AM0.41m
7:25PM0.35m
11:06AM0.46m
Low Tide
11:38PM0.10m
9:34AM-0.07m
00:10AM0.09m
10:22AM-0.02m
00:42AM0.08m
11:11AM0.05m
1:14AM0.06m
12:04PM0.14m
1:46AM0.05m
1:11PM0.23m
2:18AM0.05m
2:53PM0.29m
2:52AM0.04m
clear
clear
clear
rain showers
rain showers
rain showers
part cloud
rain showers
rain showers
clear
clear
clear
clear
clear
rain showers
part cloud
clear
clear
clear
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:03
6:03
6:03
6:03
6:03
6:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:22
7:22
7:22
7:22
7:22
7:22
7:22
7:22
 mm
2
7
1
3
1
1
3
Temp °C
25
24
25
26
25
26
26
25
26
26
25
26
26
24
25
26
24
25
26
24
25
Feels °C
24
24
26
27
26
26
26
25
26
26
25
26
26
24
24
25
24
24
26
23
25
  • 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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