Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 31 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 31 Jul 2026:

  • Most powerful swell: Sunday 2 Aug, 2AM (local time) - 10ft (3.0m), 8s period, ENE swell with 1,046 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 8s and forecast to arrive on Sunday (Aug 02) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Sun 2nd Aug)10ft (3.0m) 8s

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


The Lowdown

Alright folks, Rusty here. Let’s take a look at what’s shaping up for Ammonias. It’s a bit of a rough patch to start, but there’s a flicker of hope late in the game.

The next couple of weeks are looking pretty average for Ammonias, with a lot of cross-shore wind messing things up. The first week is a write-off, really. From Friday the 31st to Friday the 7th of August, the wind is a constant cross or cross-onshore, never letting the surf clean up. The swell is between 4ft and 8ft, but the period is short, 6 to 8 seconds, so it’s just weak, lumpy, cross-chop. The combined energy is moderate at best, peaking at 1247 on Saturday the 1st, but with that 18 mph fresh cross-breeze, it’s just a mess. This is a reef break, so that short-period, wind-affected swell is going to be a frustrating, bumpy ride. The water temp is a normal 80°F for the time of year.

There’s a noticeable gap from the 8th to the 11th of August where the surf is still poor, with swell dropping to 3ft or less. The wind stays onshore or cross-shore, and the water is just choppy.

Then we get a little glimmer. On the 12th of August (Wednesday) morning, a new S swell arrives at 4ft with a very long period of 18 seconds. The combined energy jumps to 1206, which is a proper moderate pulse. The wind is a cross-shore from the ENE at 12 mph, which is the best we’ve seen all fortnight. This is a reef break, so that long-period groundswell is ideal here – it should wrap in and offer some proper, powerful lines. It’s not a standout by any means, but it’s the only time the score ticks up to a 2. It’s not quite clean enough to be a classic, but it’s the best on offer.

The following days, the 13th and 14th, see the swell drop back down and the wind turning onshore again, so the window is narrow.

Nothing in this outlook is a true standout. The 12th of August morning is the best bet, but even then, it’s a marginal call with that cross-breeze. The setup here is more interesting for a kiter than a paddle surfer, given the persistent wind and choppy conditions.

Rusty.

Short Range Forecast

Light rain (total 5mm), mostly falling on Sat afternoon. Warm (max 27°C on Fri morning, min 24°C on Sat night). Mainly fresh winds.

Days 4-6 Weather Summary

Light rain (total 4mm), mostly falling on Wed night. Warm (max 26°C on Mon afternoon, min 24°C on Mon morning). Wind will be generally light.

Friday
31
Saturday
1
Sunday
2
Monday
3
Tuesday
4
Wednesday
5
Thursday
6
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
1
1
1
1
1
0
1
1
1
0
0
1
1
0
1
0
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)
1.5
E
8
2
E
7
2.5
E
8
2.5
E
8
2.5
ENE
8
3
ENE
8
2.4
ENE
8
2.2
ENE
8
2
ENE
8
1.7
ENE
8
1.6
ENE
8
1.5
ENE
8
1.5
ENE
12
1.5
ENE
11
1.5
ENE
11
1.3
ENE
10
1.2
ENE
9
1.2
ENE
9
1.2
ENE
8
1.4
ENE
8
1.4
ENE
6
Wave Graph
Metric surfscale
Energy kJ
253
388
726
880
871
1046
819
699
567
394
353
306
583
515
487
325
227
213
181
232
156
Wind (km/h)
20
ENE
25
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
20
NE
20
ENE
25
NE
15
ENE
15
ENE
15
ENE
15
ENE
20
ENE
10
NE
15
ENE
15
ENE
20
ENE
20
ENE
Wind State
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross-on
cross-on
cross
cross
High Tide
5:08PM0.61m
5:22AM0.32m
5:32PM0.57m
6:19AM0.34m
5:54PM0.51m
7:26AM0.38m
6:14PM0.44m
8:45AM0.44m
6:28PM0.37m
10:10AM0.50m
11:24AM0.57m
Low Tide
10:03AM0.04m
11:56PM0.09m
10:44AM0.09m
00:22AM0.07m
11:33AM0.16m
00:50AM0.05m
12:35PM0.23m
1:21AM0.04m
2:08PM0.29m
1:58AM0.03m
2:46AM0.02m
3:47AM0.01m
cloud
part cloud
part cloud
part cloud
rain showers
rain showers
rain showers
part cloud
part cloud
part cloud
cloud
part cloud
cloud
part cloud
part cloud
cloud
cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:09
6:09
6:09
6:09
6:11
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:16
7:16
7:15
7:15
7:15
7:15
7:14
 mm
1
3
1
4
2
2
1
Temp °C
27
27
25
26
25
24
26
26
25
25
26
24
25
25
25
26
26
25
26
25
25
Feels °C
27
26
25
24
23
21
24
24
23
24
26
24
25
26
26
27
28
28
28
26
26
  • 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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