Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 08 Sep 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.9°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 9 Sep 2026:

  • Best quality surf: Wednesday 9 Sep, 8PM (local time) - 3ft (0.9m), 13s period, SSW swell with glassy winds.
  • Most powerful swell: Tuesday 15 Sep, 11PM (local time) - 2.5ft (0.8m), 19s period, SSW swell with 475 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 9 Sep, 8PM (local time) - 3ft (0.9m), 13s period with SSW 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 8PM. The primary swell is predicted to be 0.9m and 13s period with a secondary swell of 1.0m and 8s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Ammonias in the next 16 days are 0.8m 19s and forecast to arrive on Tuesday (Sep 15) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 8s period and expected on Monday (Sep 14) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Wed 9th Sep)3ft (0.9m) 13s
Best Surf 8PM (Wed 9th Sep)3ft (0.9m) 13s
Most Powerful11PM (Tue 15th Sep)2.5ft (0.8m) 19s

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


The Lowdown

Alright, let’s get this straight.

Honestly, the next couple of weeks are looking pretty frustrating for us. We’ve got a real dry spell on the horizon, with most days serving up junky, cross-onshore wind and small, weak swell. If you’re itching to get wet, you’ll need to pick your moments, and even then, it’s going to be a grind for anything half-decent.

The first real window of opportunity looks like it will be on the morning of Wednesday the 18th. The swell is still small, around 3ft, but it’s from the SSW and carrying a solid 17-second period. That’s proper groundswell energy, clocking in at 1216 on the energy scale, which is the strongest we’ll see in the whole run. The wind is cross-shore from the ENE at 25 km/h, which is a bit of a shame, but the wave quality should be there. Ammonias is a reef break, so it can handle that direction better than a beachie. It’s a fairly consistent spot, so there should be sets rolling through, but you’ll be sharing it with a few others – it’s often got a crew on it.

The other day that could offer a glimmer of hope is the morning of Friday the 20th. The swell bumps up to 6ft from the E with a short 8-second period. That’s a lot of windswell, and with a cross-on wind from the E, it’s going to be a bit of a chaotic mess. Honestly, that’s probably more interesting for the kite surfers than us paddle surfers. The energy is high at 565, but the quality just won't be there.

To be honest, the rest of the time, we’re looking at a lot of nothing. There are gaps of three to four days where I wouldn’t even bother paddling out. The swell direction is mostly ENE, which isn't the optimum SSE for this spot, and the winds just keep messing it up. It’s a classic case of the ocean just not cooperating.

So, keep your board in the car, but don’t get your hopes up. The standout is that Wednesday morning session, it’s our best chance at a real wave. It’s a long-range call, so it’s promising but not set in stone just yet.

Talk soon.

Rusty

Short Range Forecast

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

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Sat morning, min 24°C on Fri night). Wind will be generally light.

Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
2
1
2
0
0
1
0
2
1
0
0
0
0
0
1
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.6
ENE
11
0.9
SSW
14
0.9
SSW
13
0.7
SSW
13
1.3
ENE
8
1.7
ENE
7
1.5
ENE
7
0.6
SW
16
1.1
ENE
11
1.4
ENE
11
0.9
ENE
10
0.9
ENE
10
0.5
SSW
13
0.5
SW
15
0.4
SSW
14
0.6
SSW
14
0.4
SW
14
0.5
SW
22
0.5
SW
21
Wave Graph
Metric surfscale
Energy kJ
560
336
253
178
215
314
212
198
314
436
173
135
98
104
82
134
49
227
224
Wind (km/h)
10
SW
10
S
10
SSE
10
NNE
20
E
20
E
20
ENE
20
ENE
15
ENE
15
ENE
15
E
10
ENE
15
ENE
15
ENE
10
ENE
15
NE
20
ENE
15
ENE
15
NE
Wind State
cross
cross-on
on
cross-off
cross-on
cross-on
cross
cross-on
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-on
cross
cross
High Tide
2:21AM0.36m
2:54PM0.66m
3:04AM0.41m
3:24PM0.61m
3:47AM0.47m
3:51PM0.55m
4:29AM0.51m
4:16PM0.48m
5:11AM0.54m
4:38PM0.41m
5:56AM0.55m
4:55PM0.35m
Low Tide
9:05PM0.11m
7:55AM0.03m
9:25PM0.09m
8:43AM0.05m
9:45PM0.07m
9:31AM0.09m
10:06PM0.05m
10:19AM0.13m
10:28PM0.04m
11:10AM0.18m
10:50PM0.04m
12:08PM0.22m
11:14PM0.05m
clear
clear
clear
clear
clear
thunderstorm
rain showers
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:22
6:22
6:22
6:22
6:22
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:46
6:45
6:45
6:44
6:43
6:42
6:40
 mm
1
1
Temp °C
26
27
27
26
27
26
25
26
26
25
26
25
25
26
25
25
26
26
25
Feels °C
28
30
29
30
29
27
26
26
26
26
27
26
26
27
25
25
27
26
26
  • 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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