Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 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 12 Jul 2026:

  • Most powerful swell: Sunday 12 Jul, 2PM (local time) - 7ft (2.1m), 8s period, ENE swell with 487 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.1m 8s and forecast to arrive on Sunday (Jul 12) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 8s period and expected on Tuesday (Jul 14) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2PM (Sun 12th Jul)7ft (2.1m) 8s

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


Alright folks, Rusty here. Let’s get into it.

Alright, lookin’ at the charts for the next couple of weeks, and honestly, it’s a bit of a slow grind. We’re talking about Ammonias, a reef break, and for the first ten days or so, the wind is just a constant pain. You’ll see plenty of swell on the cards, but it’s all tangled up with onshore or cross-shore breezes, making it lumpy and messy. The water temp is around 79°, which is about average for this time of year, nothin’ crazy there.

The first real chance you’ll get a wave that’s even worth paddling out for is on Monday, July 13th. The swell is coming from the ENE at 6 ft, but it’s only a short period of 7 seconds, so it’ll be a bit weak and lacking punch. The wind is still cross-shore, keeping things choppy. The combined energy is moderate (688). It’s a marginal one, but if you’re desperate, you might find a few.

Honestly, the standouts don’t show up until way later. Skip the first week and a half of this. The real whisper on the horizon is for Wednesday, July 22nd, and more so Thursday, July 23rd. A very long period groundswell from the SSW starts to arrive. The period jumps up to 26 seconds on the 22nd, with a combined energy of 1023 (moderate), and then 21 seconds on the 23rd with a solid 1337 (strong energy). The swell height is small, only 3 ft, but that period is so long it’ll wrap around and draw lines. The wind on Thursday afternoon turns to a gentle cross-shore from the ENE at 9 mph, giving us a chance at some clean, glassy lines. For a reef break like Ammonias, this super long period swell is perfect – it’ll hold its shape and won’t just close out. This is the best on offer, no question. It’s a little over a week away, so keep an eye on it, but the potential is there for a proper session.

After that, into Saturday, July 26th, the swell picks up a bit more size, hitting 5 ft from the S with a period of 19 seconds and a combined energy of 2079 (strong). The wind stays cross-shore, so it’s not as clean as the 23rd, but the energy is there. This is your second-best option, but keep your expectations in check with the wind.

The crowds at Ammonias can be “often” busy, so on that Thursday the 23rd, if you get a window of light wind, you might have to share it. Still, for a reef break with that kind of period, it’ll be worth the paddle.

Rusty.

Short Range Forecast

Moderate rain (total 18mm), heaviest on Sun afternoon. Warm (max 26°C on Sat afternoon, min 23°C on Mon night). Mainly fresh winds.

Days 5-7 Weather Summary

Moderate rain (total 15mm), heaviest on Wed afternoon. Warm (max 26°C on Thu morning, min 24°C on Tue night). Wind will be generally light.

Sat
11
Sunday
12
Monday
13
Tuesday
14
Wednesday
15
Thursday
16
Friday
17
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
1
1
0
0
0
1
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
Height Map
Wave
Height (m)
Direction
Period (s)
1.9
ENE
7
1.9
ENE
7
2.1
ENE
7
2
ENE
8
2.1
ENE
8
1.8
ENE
8
1.7
ENE
7
1.5
ENE
7
0.7
SW
14
1.5
ENE
8
1.4
ENE
8
1.3
ENE
8
0.6
SSW
15
0.8
SSW
16
0.7
SSW
16
0.6
SSW
17
0.7
SSW
14
1.5
ENE
6
1.6
ENE
7
1.6
ENE
6
0.7
SSW
14
Wave Graph
Metric surfscale
Energy kJ
387
369
475
447
468
358
314
242
189
257
213
186
146
314
237
197
180
170
216
216
207
Wind (km/h)
30
NE
25
ENE
25
ENE
25
NE
25
ENE
20
ENE
25
ENE
20
ENE
20
ENE
20
NE
15
ENE
20
E
15
E
15
E
20
E
20
ENE
25
E
20
ENE
25
ENE
20
ENE
25
ENE
Wind State
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
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
7:07AM0.31m
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
12:04PM0.14m
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
rain showers
rain showers
rain showers
rain showers
clear
rain showers
rain showers
rain showers
clear
clear
rain showers
cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
6:01
6:01
6:03
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
7:22
 mm
1
3
2
2
3
1
4
2
1
3
5
5
1
Temp °C
26
25
25
25
24
25
25
24
25
25
24
25
25
25
26
26
25
26
26
25
25
Feels °C
25
25
25
23
23
24
24
23
24
24
23
25
25
27
26
26
25
26
25
25
24
  • 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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