Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 02 Sep 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
27.2°C
0.3° 

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


Ammonias surf forecast from 2 Sep 2026:

  • Best quality surf: Tuesday 8 Sep, 11AM (local time) - 21ft (6.5m), 16s period, S swell with onshore winds.
  • Most powerful swell: Tuesday 8 Sep, 2PM (local time) - 28ft (8.5m), 14s period, S swell with 29,089 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 8 Sep, 11AM (local time) - 21ft (6.5m), 16s period with S 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 Tuesday (Sep 08) at 11AM. The primary swell is predicted to be 6.5m and 16s period with a secondary swell of 3.0m and 8s. The wind is predicted to be onshore as the swell arrives.

The most powerful waves expected at Ammonias in the next 16 days are 8.5m 14s and forecast to arrive on Tuesday (Sep 08) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 8s period and expected on Wednesday (Sep 09) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)11AM (Tue 8th Sep)21ft (6.5m) 16s
Best Surf11AM (Tue 8th Sep)21ft (6.5m) 16s
Most Powerful 2PM (Tue 8th Sep)28ft (8.5m) 14s

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


The Lowdown

Right, let’s have a look at what’s heading our way for the next couple of weeks at Ammonias.

The first few days are a bit of a write-off, to be honest. We’re looking at a stretch from Wednesday the 2nd all the way through to Monday the 7th where the conditions are just messy. The wind is a persistent cross-shore, mostly around 15 to 18 mph, and the sea state is all lumpy and chopped up. The swell is there, but it’s not clean, and the scores are low. It’s not the time to get excited.

The real standout, and the one I’d circle on the calendar, is Tuesday the 8th. We’ve got a massive pulse of S swell pushing in – 21ft in the morning, jumping to 25ft in the afternoon. That’s a lot of water, with a 16-second period on the first part of the day, so it’s a proper groundswell. The combined energy is through the roof (22,354 in the morning, 20,329 in the afternoon). But here’s the thing – with that size, this is strictly for experts only. Anyone else needs to stay well clear. The wind on the morning of the 8th is a screaming onshore from the SSE at 43 mph, gusting to gale force, so that’s going to blow the surface out. The afternoon sees it drop to 22 mph, still cross-onshore, but the swell is even bigger. It’s a powerful, dangerous day. For most, this setup looks more interesting for kite surfing than paddle surfing.

After that, the swell drops away quickly. Wednesday the 9th has a small 6ft S swell, but the wind is still onshore and the conditions are choppy. The rest of that week and into the next is a lot of small, messy cross-shore windswell, with the odd pocket of cleaner conditions.

The best window for a decent, clean paddle comes on Sunday the 13th and Monday the 14th. On Sunday morning, we’ve got 5ft of ENE swell with a 10-second period, and the wind is glassy from the ESE. That’s a rare treat. The combined energy is moderate (599). It’s clean, small, and perfect for a longboard or a funboard. Monday the 14th morning is similar, with 4ft ENE swell, glassy wind, and calm conditions. The water temperature is about 81°F, which is just normal for the time of year – no surprises there.

That Sunday and Monday window is your best bet. After that, we’re back into a long stretch of small, fading SSW swells under 3ft, with light to moderate cross-shore winds. Nothing to write home about.

So, the pick of the bunch is Sunday the 13th morning. It’s clean, small, and glassy. The big swell on the 8th is a spectacle, but only for the experienced.

Rusty

Short Range Forecast

Light rain (total 8mm), mostly falling on Wed morning. Warm (max 26°C on Wed afternoon, min 24°C on Thu night). Mainly fresh winds.

Days 4-6 Weather Summary

Heavy rain (total 22mm), heaviest during Mon night. Warm (max 26°C on Sat morning, min 23°C on Mon morning). Winds increasing (light winds from the E on Mon morning, near gales from the E by Mon night).

Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
0
2
1
1
1
1
1
1
1
1
2
2
2
2
2
0
0
!
!
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.1
ENE
8
1.9
ENE
8
1.9
ENE
8
1.3
SE
13
1.5
SE
12
1.4
SSE
12
1.4
SSE
12
1.6
SSE
12
1.5
S
12
1.6
S
12
2.2
ENE
14
2.2
ENE
13
2.1
ENE
13
2
ENE
12
2
ENE
12
1.6
E
14
2.5
SSW
14
3.5
SSW
15
6.5
S
16
7.5
S
13
3.5
S
10
Wave Graph
Metric surfscale
Energy kJ
547
468
441
552
667
554
589
718
683
734
1705
1725
1423
1127
1121
1014
2259
4723
21316
19412
2314
Wind (km/h)
25
ENE
25
ENE
25
ENE
25
NE
25
NE
25
ENE
30
NE
30
NE
25
ENE
25
ENE
25
ENE
20
NE
20
NE
25
ENE
20
NE
15
E
30
E
40
ENE
70
SSE
35
S
15
S
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
on
cross-on
cross-on
High Tide
8:09AM0.55m
5:17PM0.30m
9:35AM0.57m
10:57AM0.61m
12:04PM0.65m
11:37PM0.20m
12:57PM0.68m
00:45AM0.25m
1:42PM0.69m
1:36AM0.30m
2:20PM0.68m
2:21AM0.36m
Low Tide
3:05PM0.29m
1:01AM0.04m
2:01AM0.05m
3:24AM0.06m
8:23PM0.17m
8:30PM0.15m
6:02AM0.04m
8:46PM0.13m
7:02AM0.02m
9:05PM0.11m
rain showers
rain showers
rain showers
cloud
part cloud
rain showers
rain showers
clear
part cloud
clear
rain showers
rain showers
part cloud
part cloud
rain showers
light rain
mod rain
mod rain
thunderstorm
thunderstorm
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:20
6:20
6:20
6:20
6:20
6:22
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:52
6:52
6:51
6:50
6:49
6:47
6:46
 mm
3
2
1
1
1
1
2
1
3
6
9
14
6
5
Temp °C
25
26
25
25
26
25
25
26
25
26
26
25
26
26
25
25
24
26
27
26
27
Feels °C
26
26
25
24
24
24
24
23
23
24
25
24
25
25
25
26
23
22
20
22
27
  • 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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