Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 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 14 Jul 2026:

  • Most powerful swell: Sunday 19 Jul, 11AM (local time) - 6ft (1.8m), 8s period, ENE swell with 385 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.8m 8s and forecast to arrive on Sunday (Jul 19) 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 1.6m 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 19th Jul)6ft (1.8m) 8s

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


The Lowdown

Right, let’s have a look at what’s on offer for the next couple of weeks. It’s been a bit of a flat spell to kick things off, but hang tight – there’s some interesting stuff showing up later.

The first real chance of a wave isn’t until the 19th of July, so we’re looking at a solid gap of nearly a week with nothing worth paddling out for. Up until then, it’s all cross-shore or cross-onshore winds and poor surf conditions.

The only spot we’ve got on the radar is Ammonias, a reef break. It’s fairly consistent, but it’s an intermediate spot and it does get crowded often. The water’s sitting at 79°, which is pretty much bang on average for this time of year, so no surprises there.

Alright, let’s talk about the best of it. The standout window looks like the end of the run, from the 26th of July. On the morning of the 26th, we’ve got a 3ft swell from the SSW, with a period of 17 seconds, and the combined energy is up at 1049 – that’s moderate to strong energy. The wind is cross from the ENE at 12 mph, which is workable. By the afternoon, it builds to 3ft from the E, with a 16-second period and the energy jumps to 1210. The wind swings to the NE at 16 mph, still cross. That’s a solid, long-period groundswell, and for a reef like Ammonias, that’s going to offer some nice, lined-up waves. The sets will be well-spaced, so paddling out shouldn’t be a total mission.

Now, the 27th of July holds similar size – 4ft to 4ft from the E, with periods around 15 to 16 seconds, and energy well over 1100. The wind stays cross, so it’ll be a bit lumpy but still rideable. Then on the 28th, we get a 7ft swell from the ENE with a 14-second period and the energy goes through the roof at 2181. That’s a big, powerful swell. For the reef, it’s going to be heavy. That’s expert territory only – too much punch for anyone not well experienced. The 29th is similar, with 7ft and a 13-second period, and energy still huge at 1820.

So, overall, the best bet for the average surfer is the 26th and 27th of July. The swell direction from the E and SSE is a good match for what the reef likes, and the long period will give you proper waves. The 28th and 29th are for the brave only.

There’s a chance of a few marginal sessions between the 19th and 25th, but with the cross-shore winds and lower energy, it’s not going to be anything special. The forecast is a bit more reliable for the near-term, and while the end-of-the-month stuff looks promising, it’s a bit further out, so keep an eye on it.

If you’re a kiter, the choppy, cross-shore conditions on the beachier days might be more your thing, but for a paddle, hang out for that last week.

Rusty.

Short Range Forecast

Moderate rain (total 18mm), heaviest on Wed morning. Warm (max 26°C on Wed afternoon, min 23°C on Tue night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 3mm), mostly falling on Fri morning. Warm (max 26°C on Fri afternoon, min 23°C on Sun night). Wind will be generally light.

Tuesday
14
Wednesday
15
Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
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
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
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)
0.7
SW
14
0.7
SW
14
0.6
SSW
17
1.3
ENE
7
0.6
SSW
18
0.8
SSW
16
0.7
SSW
16
0.6
SSW
17
1.5
ENE
7
1.4
ENE
7
1.4
ENE
7
1.5
ENE
6
1.6
ENE
7
0.7
S
14
1.6
ENE
6
1.8
ENE
8
1.6
ENE
8
1.5
ENE
8
1.3
ENE
7
0.6
S
16
1.4
ENE
7
Wave Graph
Metric surfscale
Energy kJ
189
186
200
183
216
314
237
195
198
180
196
172
216
198
176
385
316
277
177
190
176
Wind (km/h)
25
ENE
20
ENE
15
ENE
15
E
15
E
15
ENE
20
E
20
ENE
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
20
ENE
15
NE
20
E
20
NE
15
NE
20
ENE
20
ENE
20
NE
Wind State
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
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
Low Tide
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
1:46AM0.05m
1:11PM0.23m
2:18AM0.05m
2:53PM0.29m
2:52AM0.04m
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
clear
clear
rain showers
rain showers
clear
clear
part cloud
part cloud
clear
rain showers
rain showers
clear
clear
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
6:03
6:03
6:03
6:03
6:03
<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
 mm
2
1
1
4
2
5
3
1
1
1
2
1
Temp °C
25
25
24
25
26
25
26
26
25
25
26
25
26
26
24
25
25
24
25
25
24
Feels °C
24
24
23
26
27
25
26
26
25
25
26
25
26
26
24
25
24
24
25
24
23
  • 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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