Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 05 Sep 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
27.1°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 5 Sep 2026:

  • Best quality surf: Wednesday 9 Sep, 5AM (local time) - 4.5ft (1.3m), 10s period, ENE swell with glassy winds.
  • Most powerful swell: Tuesday 8 Sep, 2AM (local time) - 16ft (5.0m), 13s period, SSW swell with 8,596 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 9 Sep, 5AM (local time) - 4.5ft (1.3m), 10s period with ENE swell.

Best Forecast Surf Conditions for Ammonias this week:

The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 09) at 5AM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 1.3m and 10s. Another secondary swell of 1.1m and 8s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Ammonias in the next 16 days are 5.0m 13s and forecast to arrive on Tuesday (Sep 08) at 2AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 10s period and expected on Tuesday (Sep 08) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Wed 9th Sep)4.5ft (1.3m) 10s
Best Surf 5AM (Wed 9th Sep)4.5ft (1.3m) 10s
Most Powerful 2AM (Tue 8th Sep)16ft (5.0m) 13s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what’s coming down the line for Ammonias. Gotta be straight with you – this is a tough one to get excited about.

Right off the bat, we’ve got some hefty swell on the way, but the wind is just ruining it. The forecast shows a lumpy, choppy mess for the vast majority of the next 16 days. The real standout, and the only time I’d even consider paddling out, is a very brief window on Wednesday, September 9th. That morning, the wind swings light and onshore from the SE at 6 mph, dropping the lumpiness. Swell is small at 3 ft from the SSW with a long 14-second period (moderate wave energy of 633). It’s still a marginal call, and the waves will be small, but it’s the cleanest we’re going to see. The crowd situation at Ammonias can be an issue, but with conditions this marginal, you might have it to yourself.

The water temp is sitting at 81°F, which is bang on average for this time of year – no surprises there.

From Saturday, September 5th through to Tuesday, September 8th, it’s a write-off. Strong winds from the ENE and E, gusting 15 to 22 mph, all cross-on or cross, creating a choppy, lumpy surface. The swell is there, with moderate energy in the 2000s, but it’s ugly. By Monday the 7th and Tuesday the 8th, the swell picks up to 8 ft and even 11 ft, but with that onshore wind, it’s just a big, blown-out mess. That’s expert-only territory if you’re silly enough, and honestly, with that wind, it’s more interesting for kite surfing than paddle surfing.

After that brief clean moment on the 9th, we go back into a long stretch of poor to marginal conditions. From Thursday the 10th all the way through to Sunday the 20th of September, the story is the same: east-northeast winds blowing 9 to 15 mph, mostly cross-on or cross, keeping the surf choppy and weak. The swell drops off significantly, with wave energy falling into the 500s and 600s, and the period shortens to 7-8 seconds – that’s short-period, windswell junk. There are a few late-period groundswell pulses from the SSW (16-18 seconds) showing up around the 16th and 17th, but the swell height is tiny (3 ft) and the wind is still messy. It’s a tease.

So, bottom line: the only real chance for a clean wave is that Wednesday morning, September 9th. It’s not going to be big, but it’ll be the best of a bad lot. The rest of the 16 days? A long, frustrating gap. Stay patient.

Rusty.

Short Range Forecast

Heavy rain (total 57mm), heaviest during Sun night. Warm (max 26°C on Sat morning, min 23°C on Sun night). Winds increasing (light winds from the E on Sun night, strong winds from the SE by Mon night).

Days 4-6 Weather Summary

Light rain (total 8mm), mostly falling on Tue morning. Warm (max 28°C on Tue afternoon, min 24°C on Thu night). Winds decreasing (fresh winds from the S on Tue morning, calm by Tue night).

Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
Friday
11
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
2
0
0
2
0
0
0
0
1
2
2
0
0
0
1
0
0
1
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.2
ENE
14
2.1
ENE
13
2.2
ENE
13
2
ENE
13
2.1
ENE
12
1.8
SSW
14
2.5
SSW
14
3.5
SSW
14
5
SSW
13
2.5
S
9
1.8
ENE
11
1.4
ENE
10
0.9
SSW
14
0.9
SSW
13
0.7
SSW
13
0.6
SSW
17
1.5
ENE
7
1.5
ENE
7
1.5
ENE
7
1.5
ENE
7
1.7
ENE
7
Wave Graph
Metric surfscale
Energy kJ
1859
1512
1654
1259
1240
1285
2589
4468
8596
1104
771
402
341
257
178
203
242
210
215
231
247
Wind (km/h)
25
ENE
25
NE
20
ENE
20
ENE
25
ENE
15
E
30
E
35
ESE
40
SSE
30
SSW
20
SSW
5
SW
10
SE
15
E
20
ENE
25
E
20
ENE
20
ENE
20
ENE
20
ENE
15
ENE
Wind State
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
on
cross-on
cross-on
cross
on
cross-on
cross-on
cross-on
cross
cross-on
cross-on
cross
cross-on
High Tide
12:04PM0.65m
11:37PM0.20m
12:57PM0.68m
00:45AM0.25m
1:42PM0.69m
1:36AM0.30m
2:20PM0.68m
2:21AM0.36m
2:54PM0.66m
3:04AM0.41m
3:24PM0.61m
3:47AM0.47m
3:51PM0.55m
4:29AM0.51m
Low Tide
8:23PM0.17m
8:30PM0.15m
6:02AM0.04m
8:46PM0.13m
7:02AM0.02m
9:05PM0.11m
7:55AM0.03m
9:25PM0.09m
8:43AM0.05m
9:45PM0.07m
9:31AM0.09m
10:06PM0.05m
part cloud
rain showers
rain showers
thunderstorm
thunderstorm
thunderstorm
mod rain
thunderstorm
thunderstorm
rain showers
clear
clear
clear
rain showers
rain showers
rain showers
clear
part cloud
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:20
6:20
6:22
6:22
6:22
6:22
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:50
6:49
6:47
6:46
6:45
6:45
6:44
 mm
2
4
2
2
19
9
6
13
4
2
1
1
Temp °C
26
26
25
26
26
25
25
26
26
27
28
26
28
28
26
26
26
25
26
26
25
Feels °C
25
25
25
26
26
25
24
26
24
28
29
30
32
30
29
27
26
26
26
26
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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