Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 08 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.7° C
0.0° 

Ammonias surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Ammonias surf forecast from 9 Aug 2026:

  • Most powerful swell: Saturday 15 Aug, 8PM (local time) - 10ft (3.0m), 9s period, ENE swell with 1,582 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 3.0m 9s and forecast to arrive on Saturday (Aug 15) at 8PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 12s period and expected on Thursday (Aug 13) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Sat 15th Aug)10ft (3.0m) 9s

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


The Lowdown

Alright folks, Rusty here. Let’s be straight with you – the next couple of weeks at Ammonias are looking like a bit of a grind for most of us. We’ve got a window that kicks off around Saturday the 9th, but the early days are going to be a battle. The water’s sitting at a warm 80°, which is about average for this time of year, so at least you won’t need a winter suit.

The weekend starts with some cross-shore breeze and a messy, short-period swell. It’s not going to be pretty. We’re looking at around 5ft to 5ft of wind-blown ENE slop, and that’s just not going to hold up on this reef. The energy is weak, coming in at only 435 on Saturday, and the whole thing looks poor.

Sunday the 10th is more of the same, with that cross-shore breeze chopping it up. I’d honestly give the start of this period a miss. There’s a gap where the surf just isn't worth paddling out for. It’s not until the middle of the following week that we see any real pulse of energy, and it’s a big one.

Around Wednesday the 13th and Thursday the 14th, we get a proper groundswell from the south. The period jumps up to 18 seconds, and the energy readings get serious – over 1000 and even pushing 1258. This is where Ammonias could finally turn on. The direction is right, and that long period is what this reef loves. The swell is around 4ft to 5ft, which is a great size for intermediate surfers, and the winds are forecast to be cross-shore, not perfect, but workable. There’s still a bit of chop, but this is definitely the best part of the outlook, especially Thursday morning.

Now, I’ve got to give you a heads-up about this one. A 15 to 18 second period is a proper long-period groundswell, and on a reef like this, it’s a thing of beauty. The sets will be long and clean, and paddling out between them will be easier. This is the standout period. But remember, it's a week out, so treat this as promising but not locked in.

After that, the forecast gets a bit wild. The swell builds, but the quality drops off. By Friday the 16th, we’re looking at a bigger 8ft to 8ft ENE swell, but the period drops and the wind gets fresh and lumpy. It’s still cross-shore, which might make it interesting for the tow crew, but for a paddle? It’s going to be messy. And if it’s any bigger than 8ft, that’s expert-only territory.

Saturday the 17th brings a jump in size – 10ft out of the ENE. The period is still short, but there’s a brief window with a cross-offshore wind that could clean it up. If you’re a confident expert, that might be your shot. But with that much water moving and a short period, it could be a washing machine.

Then it all falls apart. Strong winds and a shifting swell direction from the SSE on Sunday the 18th, followed by more ENE windswell for the rest of the week. Honestly, after that initial promise, it looks like a few days of blown-out conditions before the energy fades back into small, weak surf. The long-range stuff in the second week is just not worth writing home about.

So, my take? If you want a wave worth getting out of bed for, keep your eyes on Thursday the 15th. That south swell at Ammonias with clean conditions is the one to chase. The rest is for kooks and masochists.

Rusty out.

Short Range Forecast

Light rain (total 2mm), mostly falling on Mon morning. Warm (max 27°C on Sat afternoon, min 24°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

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

Sat
8
Sunday
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
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
1
1
1
1
1
0
0
0
0
2
2
1
1
1
1
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.5
SW
18
1.5
ENE
6
1.6
ENE
7
1.4
ENE
7
0.7
SSW
16
1.6
ENE
7
1.5
ENE
7
0.7
SSW
15
0.7
SSW
15
0.7
SSW
14
0.7
S
20
0.9
S
18
1.1
S
18
1.4
S
16
1.4
S
16
1.3
S
15
1.3
S
15
1.2
S
14
2.3
ENE
8
2.5
ENE
8
Wave Graph
Metric surfscale
Energy kJ
161
165
233
193
263
259
234
231
222
210
373
515
741
1029
1004
784
743
598
589
916
Wind (km/h)
25
NE
20
ENE
20
ENE
20
NE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
25
NE
20
NE
25
NE
25
NE
25
NE
25
NE
30
NE
25
NE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
High Tide
00:17AM0.19m
2:05PM0.73m
1:24AM0.22m
2:47PM0.75m
2:17AM0.26m
3:26PM0.74m
3:06AM0.30m
4:02PM0.71m
3:54AM0.34m
4:34PM0.66m
4:44AM0.37m
5:03PM0.59m
Low Tide
9:20PM0.16m
6:02AM-0.03m
9:35PM0.15m
7:01AM-0.05m
9:56PM0.13m
7:54AM-0.06m
10:20PM0.12m
8:43AM-0.04m
10:44PM0.10m
9:30AM-0.00m
11:09PM0.08m
10:17AM0.05m
11:35PM0.07m
clear
part cloud
clear
clear
part cloud
rain showers
clear
clear
part cloud
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:11
6:13
6:13
6:13
6:13
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:13
7:12
7:10
7:10
7:09
7:08
7:08
 mm
2
Temp °C
27
25
26
27
25
26
26
25
27
27
25
26
26
25
26
27
26
26
27
25
Feels °C
27
25
26
27
26
27
27
25
28
27
25
25
25
24
25
26
25
25
26
24
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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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