Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 30 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.4° 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 31 Jul 2026:

  • Most powerful swell: Sunday 2 Aug, 5AM (local time) - 8ft (2.5m), 8s period, ENE swell with 979 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.5m 8s and forecast to arrive on Sunday (Aug 02) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5AM (Sun 2nd Aug)8ft (2.5m) 8s

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


The Lowdown

Alright folks, Rusty here. Let’s get real about the next 16 days at Ammonias. I’ve been staring at the charts and to be honest, it’s a rough stretch. We’re looking at a long, frustrating gap with very little to get excited about.

The pattern starts off flat and messy. Right from the get-go, Friday the 31st of July, we’ve got a 6 ft swell from the east, but it’s a short-period 7 second windswell, and the wind is a cross-on breeze from the ENE at 16 mph. The water is near average for the time of year, which is about the only thing that’s not a letdown. The combined energy of all swells is only moderate (800), and the conditions are just poor – choppy, lumpy, no good. Saturday and Sunday the 1st and 2nd of August see the swell bump up to 8 ft, but it’s the same story: cross-shore winds at 19 mph, still a short period. That size is pushing into expert territory with onshore winds, so it’s a raw, blown-out mess. The energy climbs to a strong 1192 but it’s wasted.

The whole first week is a write-off. We get a slight drop in wind to 12 mph on Monday the 3rd, but the swell is dropping and the period is still a weak 8 seconds. The surf is marginal at best, with a moderate cross-chop. Tuesday the 4th brings a longer period swell of 12 seconds, which is a tease, but the swell height is only 5 ft and the wind is still cross. The energy is moderate (845), but the conditions are still poor. For the rest of that week and into the next, it’s just a constant grind of 4 ft to 6 ft east swell with onshore or cross-shore winds, leaving the surface choppy and unrideable. We’re talking about one of those blank runs that feels like it’s never going to end.

There is a flicker of hope around Monday the 10th of August. We get a 3 ft swell from the SSW, but it’s a proper groundswell with a very long 16-second period. The problem? The wind is cross-on from the east or ENE, and the energy is moderate (950). The long period means it’s breaking straight on a beach setup, so it’s not going to hold shape. It’s a poor option. The same pattern continues through the 11th, 12th, and 13th – long period SSW swells mixed with a short period east windswell, but the wind is always wrong. It’s not until Friday the 14th and Saturday the 15th of August that we see the wind finally swing offshore from the SSE and SE, with light breezes. The swell on the 15th is 4 ft from the south with a 16-second period, giving a strong 826 combined energy. The wind is glassy offshore, which is a major positive. For a reef break that likes a SSE swell, this is the only true standout. It’s the best on offer, but it’s a long way off and the uncertainty is high. The sets will be long and clean, but with that long period, it might be a bit straight for the beachies. Still, if you’re patient, this is the window to watch.

For now, the setup looks more interesting for kite surfing than paddle surfing, given the persistent cross-shore winds and lumpy conditions. Hang tight, the forecasts can change.

Rusty.

Short Range Forecast

Light rain (total 5mm), mostly falling on Thu night. Warm (max 27°C on Fri afternoon, min 24°C on Sat night). Mainly fresh winds.

Days 5-7 Weather Summary

Mostly dry. Warm (max 27°C on Wed afternoon, min 24°C on Sun night). Wind will be generally light.

Friday
31
Saturday
1
Sunday
2
Monday
3
Tuesday
4
Wednesday
5
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
0
1
1
0
1
0
1
2
0
1
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
13
1.7
E
7
2.2
ENE
7
2.5
E
8
2.5
E
8
2.5
E
8
2.5
ENE
8
2.3
ENE
8
2.2
ENE
8
2.1
ENE
8
1.7
ENE
8
1.5
ENE
8
1.6
ENE
8
1.7
ENE
12
1.5
ENE
11
1.6
ENE
11
1.4
ENE
10
1.3
ENE
9
1.3
ENE
9
Wave Graph
Metric surfscale
Energy kJ
213
311
435
736
825
857
976
755
682
606
394
313
338
767
515
561
365
274
249
Wind (km/h)
25
E
25
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
20
NE
20
ENE
20
NE
20
ENE
15
ENE
15
ENE
15
NE
20
ENE
15
ENE
15
ENE
Wind State
cross-on
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross-on
cross
cross-on
High Tide
4:33AM0.29m
5:08PM0.61m
5:22AM0.32m
5:32PM0.57m
6:19AM0.34m
5:54PM0.51m
7:26AM0.38m
6:14PM0.44m
8:45AM0.44m
6:28PM0.37m
10:10AM0.50m
Low Tide
11:32PM0.11m
10:03AM0.04m
11:56PM0.09m
10:44AM0.09m
00:22AM0.07m
11:33AM0.16m
00:50AM0.05m
12:35PM0.23m
1:21AM0.04m
2:08PM0.29m
1:58AM0.03m
2:46AM0.02m
thunderstorm
part cloud
cloud
part cloud
part cloud
part cloud
rain showers
clear
clear
part cloud
part cloud
part cloud
cloud
cloud
cloud
cloud
cloud
cloud
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:09
6:09
6:09
6:09
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:17
7:16
7:16
7:15
7:15
7:15
7:15
 mm
3
2
1
Temp °C
26
26
27
25
26
26
24
25
26
25
25
26
24
25
25
25
26
27
25
Feels °C
27
27
27
25
24
24
22
23
24
24
25
26
24
26
26
26
27
28
27
  • 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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