Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 11 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 11 Jul 2026:

  • Most powerful swell: Sunday 12 Jul, 11AM (local time) - 7ft (2.2m), 7s period, ENE swell with 516 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 7s and forecast to arrive on Sunday (Jul 12) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 8s period and expected on Tuesday (Jul 14) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11AM (Sun 12th Jul)7ft (2.2m) 7s

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


G’day, Rusty here, and I’ve gotta be straight with you – the next sixteen days at Ammonias are a real mixed bag, and honestly, mostly a struggle. The swell’s gonna be around, but the wind is our enemy for most of the run. Let’s break it down.

We kick off on Saturday, July 11th, but it’s not exactly a welcome. The swell is hanging around 7 ft to 7 ft from the ENE, but that’s coming with a fresh 19 mph cross-breeze, which has got the surface all lumpy and cross-chop. The wave energy is moderate (675-764), but the conditions are just poor. The water temp is sitting at 79°, which is pretty much average for this time of year – nothing weird there.

Sunday the 12th is more of the same: swell around 7 ft to 7 ft, ENE, but the wind is still fresh and cross-onshore, making it choppy and lumpy. The energy picks up a bit (896), but it’s not doing us any favours.

Monday the 13th sees a slight drop in swell to 6 ft to 6 ft, but that moderate cross-shore wind is still ruining the surface. The energy is dropping (578-726), and we’re only scraping a marginal surf forecast. Not great.

Tuesday the 14th brings a change in direction – the swell swings to the SW at 2 ft, with a long period of 14 seconds. That’s a proper groundswell, but the energy is weak (199-335), and the wind is still cross-shore. The wave quality is poor.

From Wednesday the 15th right through to Monday the 20th, it’s a real grind. The swell stays small, mostly under 3 ft, with periods anywhere from 7 to 16 seconds, but the wind is a constant cross or cross-onshore, from moderate to fresh. The energy is weak to moderate (94-842), and the surf is either poor or marginal at best. There’s a gap of several days here where there’s no real recommendation – just messy, lumpy conditions.

Now, there is a bit of a standout hiding in the second week. On the morning of Wednesday, July 22nd, things get interesting. The swell drops to just 2 ft, but it’s from the SSW with a very long period of 24 seconds. That’s a massive groundswell, and the energy jumps to 1220 – strong. The wind is still a moderate cross-shore, but the wave quality is only marginal. This kind of long-period, small swell is tricky at a reef break like Ammonias – it can be super straight and hard to get into, but if it lines up, it could offer some clean, powerful lines. The same pattern continues through to Thursday, July 23rd, with 3 ft from the SSW and periods of 19 seconds, though the energy stays strong (1105) but the wind stays cross-shore, keeping it marginal.

After that, from Friday the 24th into the weekend of the 25th and 26th, we’re back to the ENE windswell, around 6 ft to 6 ft, with periods of 7-8 seconds. The energy is moderate (630-770), but the wind is still cross-shore, so it’s only marginal at best. The crowds are listed as “often” at Ammonias, so when it’s clean, it’ll be busy, but honestly, with the persistent cross-breeze, it’s going to be a battle.

The real standout in this whole outlook is the Wednesday, July 22nd morning window. That 2 ft SSW swell with a 24-second period is the most interesting pulse of the forecast, but it’s a long way out and the wind is still a factor. It’s the only time the energy really ramps up, and the long period means it could produce some clean, powerful waves if the wind drops. Keep an eye on it, but don’t hold your breath.

For the rest of it, honestly, this is more of a kite-surfing setup than a paddle-surfing one, given the significant swell and poor quality from the cross-shore winds. The surf will be choppy and lumpy, and the weak, short-period swell won’t hold much shape. It’s a tough stretch.

Rusty.

Short Range Forecast

Moderate rain (total 14mm), heaviest on Sun afternoon. Warm (max 25°C on Sat morning, min 23°C on Mon night). Mainly fresh winds.

Days 4-6 Weather Summary

Moderate rain (total 19mm), heaviest on Wed morning. Warm (max 26°C on Thu morning, min 23°C on Tue night). Wind will be generally light.

Saturday
11
Sunday
12
Monday
13
Tuesday
14
Wednesday
15
Thursday
16
Friday
17
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
1
0
0
1
1
1
0
0
0
1
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)
2.1
ENE
7
2
ENE
7
1.9
ENE
7
2.2
ENE
7
2
ENE
8
2
ENE
8
1.9
ENE
8
1.7
ENE
7
1.5
ENE
7
0.7
SW
14
0.7
SW
14
1.4
ENE
8
0.7
SW
13
0.9
ENE
7
0.8
SSW
16
0.6
SSW
16
1.3
ENE
7
0.7
SSW
14
1.5
ENE
7
1.6
ENE
7
1.7
ENE
6
Wave Graph
Metric surfscale
Energy kJ
449
423
369
516
447
447
397
314
249
189
186
213
162
94
314
179
166
183
181
216
213
Wind (km/h)
30
ENE
30
NE
25
ENE
30
ENE
25
ENE
25
ENE
25
ENE
25
NE
20
ENE
20
NE
20
ENE
15
ENE
20
E
15
ENE
20
ENE
20
E
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
Wind State
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
High Tide
2:19PM0.73m
1:06AM0.18m
3:04PM0.77m
2:08AM0.19m
3:47PM0.78m
3:04AM0.21m
4:29PM0.77m
3:58AM0.23m
5:08PM0.73m
4:55AM0.26m
5:45PM0.67m
5:57AM0.28m
6:18PM0.59m
Low Tide
10:03PM0.14m
7:03AM-0.10m
10:34PM0.12m
7:55AM-0.11m
11:06PM0.11m
8:46AM-0.10m
11:38PM0.10m
9:34AM-0.07m
00:10AM0.09m
10:22AM-0.02m
00:42AM0.08m
11:11AM0.05m
1:14AM0.06m
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
clear
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
clear
clear
part cloud
clear
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
6:01
6:01
6:01
6:03
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:23
7:23
7:23
7:22
7:22
7:22
7:22
 mm
2
1
2
2
2
2
3
3
2
2
4
3
5
1
Temp °C
25
25
25
25
25
24
25
25
24
25
25
24
25
25
25
26
26
25
25
26
25
Feels °C
24
24
25
25
23
23
23
24
23
24
24
24
26
26
27
26
26
25
25
25
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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