Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 16 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 16 Jul 2026:

  • Most powerful swell: Thursday 23 Jul, 5AM (local time) - 3ft (0.9m), 21s period, SSW swell with 643 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 0.9m 21s and forecast to arrive on Thursday (Jul 23) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 7s period and expected on Thursday (Jul 16) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5AM (Thu 23rd Jul)3ft (0.9m) 21s

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


The Lowdown

G’day, I’m Rusty. Let’s have a look at what’s on offer at Ammonias.

Honestly, the next week and a half is pretty grim. From Thursday the 16th all the way through to Sunday the 26th of July, the surf is either poor or just barely marginal. The wind is stuck in a cross or cross-onshore groove with a moderate breeze, and the swell is mostly small and weak. There’s a long stretch of days where you’d be better off doing something else – the wave energy is low to moderate, often under 500 (481 on the 16th morning, for example). The water temperature sits at 80°, which is pretty much normal for this time of year, so no surprises there.

The only real glimmer of hope comes right at the tail end of the outlook. Tuesday the 28th of July starts to build, with a 10ft swell from the ENE, period 14 seconds, and combined energy kicking up to 3720 – that’s strong energy. The wind is a gentle cross-shore, just a slight cross-chop, so it’s not glassy but it’s workable. This is getting big though – over 8ft, so it’s expert territory only. The swell direction is ENE, which is a bit off the optimum SSE for Ammonias, but with that much energy and a decent period, it’s still worth a look for the experienced crew.

Wednesday the 29th of July looks even bigger – 12ft from the ENE, period 13 seconds, and wave energy cranking up to 4185. Wind is light cross-onshore, so it’s messy but not out of control. Again, this is big, heavy stuff – only for experts. The period is solid, not super long, so it should have some shape, but at a reef break like Ammonias, that size and direction will be raw.

The best on offer is Wednesday the 29th of July, morning and afternoon. It’s the biggest swell of the window, with the most energy, and the wind is light enough that it won’t totally wreck it. If you’re a seasoned surfer and you’re hungry, that’s the day to circle. The 28th is a close second – a bit smaller but still serious.

Everything else before that is a write-off. After the 29th, it drops off quick into tiny, poor surf again. So, one big late-July pulse, then back to nothing.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Thu morning. Warm (max 26°C on Thu morning, min 24°C on Thu night). Wind will be generally light.

Days 4-6 Weather Summary

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

Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
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
1
1
1
2
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
SSW
16
0.6
SSW
17
0.7
SSW
14
1.3
ENE
7
0.6
SSW
16
1.3
ENE
7
0.7
SSW
14
0.7
SSW
14
1.6
ENE
8
1.5
ENE
8
1.4
ENE
8
0.5
S
18
1.1
ENE
8
0.6
S
16
0.6
S
15
0.9
S
15
0.9
S
14
0.9
S
14
0.7
S
14
0.7
SSW
23
1.4
ENE
13
Wave Graph
Metric surfscale
Energy kJ
237
195
180
138
196
187
207
210
276
257
237
162
142
190
163
339
316
316
192
564
604
Wind (km/h)
20
E
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
25
NE
20
NE
20
ENE
25
NE
15
ENE
20
ENE
20
NE
15
NE
20
ENE
20
ENE
20
ENE
Wind State
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-on
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
High Tide
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
12:06PM0.52m
Low Tide
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
3:30AM0.04m
4:16AM0.04m
rain showers
part cloud
rain showers
part cloud
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
clear
clear
rain showers
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:03
6:03
6:03
6:03
6:05
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
7:21
 mm
1
1
1
2
1
2
Temp °C
26
26
25
26
26
25
26
26
25
25
25
24
25
25
24
25
26
24
25
25
24
Feels °C
26
26
25
26
26
25
26
26
26
24
24
23
24
24
24
25
26
24
25
25
23
  • Map Icons:
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  • 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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