Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Issued: 1 am 03 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.0° C

Normal for this time of year

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


Ammonias surf forecast from 3 Jul 2026:

  • Most powerful swell: Saturday 4 Jul, 11PM (local time) - 3ft (0.9m), 19s period, SSW swell with 627 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 0.9m 19s and forecast to arrive on Saturday (Jul 04) 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 0.4m 14s period and expected on Friday (Jul 10) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Sat 4th Jul)3ft (0.9m) 19s

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


Updates in  hr  min  s Forecast update imminent

Hey, Rusty again, now in feet and Fahrenheit for the imperial crew.

We’re starting the outlook for Ammonias with a bit of a gap before anything’s rideable. First surf shows Friday the 3rd of July, but it’s nothing to write home about.

Friday morning brings a 5ft swell from the ENE with a short 8-second interval. A moderate cross-shore wind from the same direction, showers in the air, and the combined energy sits at 639 (moderate). The water’s 79°, which is pretty normal for this time of year. The wind’s gonna mess up the surface, so it’s not gonna be clean. If you’re desperate for a paddle, you could, but don’t expect much.

Saturday the 4th, the swell drops to around 3ft but here’s the interesting bit: long-period groundswell from the south, 21 seconds. The energy jumps up strong to 1194. Problem is, the wind is still cross-shore from the NE at 25 km/h. For a reef like Ammonias, that long period can mean better shape in the right spot, but the wind kills it. It’s still a poor-quality call from the data.

Sunday the 5th is much the same – small 3ft groundswell from the south-southwest at 18 seconds, but still cross-shore breezes. The energy is moderate to strong (1025), but you’re getting chopped up. Monday the 6th rolls around and we jump back to a short-period 7ft ENE swell with moderate cross wind. That’s getting into expert-only territory size-wise. The energy’s moderate at 966, but again, poor conditions.

From Monday the 6th all the way through the 18th of July, nothing really improves. Wind is stuck on moderate ENE cross or cross-on. Thursday the 14th is the best-rated session with a tiny 3ft south-southwest groundswell, a light cross-onshore breeze, and an energy reading of 541. That’s about as good as it gets – which isn’t saying much. Everything else is poor or marginal.

There’s no real standout here. The closest to a pick would be Saturday the 4th morning because of the super long-period south swell, but the wind never cleans up. Ammonias is an exposed reef that can produce when conditions align, but they don’t this time. Over 16 days, there’s barely a session worth paddling out for. A blank run like this is more typical for the area when the trade winds lock in. Forecasts can shift, but don’t hold your breath. Keep the board in the bag.

Rusty.

Short Range Forecast

Moderate rain (total 13mm), heaviest on Fri morning. Warm (max 25°C on Fri morning, min 24°C on Fri morning). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 11mm), heaviest on Mon afternoon. Warm (max 25°C on Mon morning, min 23°C on Mon night). Mainly fresh winds.

Friday
3
Saturday
4
Sunday
5
Monday
6
Tuesday
7
Wednesday
8
Thursday
9
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
1
1
1
2
1
0
1
0
0
0
0
1
0
0
0
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)
1.6
ENE
8
1.7
ENE
8
1.8
ENE
8
0.8
S
21
0.8
S
20
0.9
SSW
19
0.9
SSW
18
0.9
SSW
18
2.2
ENE
7
2.1
ENE
8
2
ENE
8
2.1
ENE
8
2.2
ENE
8
2
ENE
8
2.2
ENE
8
1.9
ENE
8
1.9
ENE
8
2
ENE
7
2
ENE
7
1.7
ENE
7
1.6
ENE
7
Wave Graph
Metric surfscale
Energy kJ
302
347
382
573
490
608
522
510
516
469
481
501
559
451
526
397
411
417
405
319
258
Wind (km/h)
25
ENE
25
ENE
20
ENE
25
ENE
25
NE
20
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
30
ENE
25
ENE
25
ENE
30
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
20
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross
cross-on
cross-on
cross
cross-on
High Tide
6:17PM0.59m
6:37AM0.22m
6:44PM0.55m
8:00AM0.26m
7:11PM0.49m
9:31AM0.32m
7:37PM0.42m
10:50AM0.41m
8:03PM0.35m
11:53AM0.50m
8:28PM0.28m
12:45PM0.59m
9:34PM0.22m
Low Tide
10:47AM0.04m
1:33AM0.09m
11:30AM0.10m
2:02AM0.07m
12:26PM0.17m
2:33AM0.05m
1:48PM0.24m
3:07AM0.02m
3:53PM0.29m
3:45AM-0.01m
6:49PM0.27m
4:28AM-0.03m
9:16PM0.22m
rain showers
rain showers
rain showers
rain showers
part cloud
rain showers
rain showers
rain showers
rain showers
clear
rain showers
rain showers
clear
part cloud
rain showers
rain showers
clear
rain showers
rain showers
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
5:58
5:58
5:58
5:58
6:00
6:00
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:23
7:23
7:23
7:23
7:23
7:23
7:23
 mm
1
1
3
1
1
2
2
2
2
2
4
1
2
2
1
2
Temp °C
25
25
24
25
25
24
24
25
24
25
25
24
25
25
24
25
25
24
25
26
24
Feels °C
24
24
23
23
23
22
23
23
23
23
23
23
23
23
23
23
23
23
24
25
23
Swell 1
Height (m)
Direction
Period (s)
0.6
SSW
17
0.6
SSW
17
0.5
SSW
16
0.8
S
21
0.8
S
20
0.9
SSW
19
0.9
SSW
18
0.9
SSW
18
0.9
SSW
16
0.9
SSW
16
1
SSW
15
0.9
SSW
15
0.9
SSW
14
0.9
SSW
14
0.8
SSW
14
0.8
SSW
14
0.8
SSW
13
0.7
S
13
0.7
S
12
0.6
S
12
0.5
S
12
Energy kJ
232
216
147
573
490
608
522
510
437
446
481
355
350
341
265
247
239
168
151
110
75
Swell 2
Height (m)
Direction
Period (s)
0.4
SSW
13
0.4
SSW
13
0.5
SSW
13
0.6
SSW
16
0.6
SSW
15
0.7
SSW
15
0.6
SSW
14
0.3
SE
9
0.4
SSW
13
0.4
SE
9
0.4
SE
9
0.4
SE
9
0.4
SE
8
0.4
SE
8
0.2
SSE
8
0.4
SE
9
0.3
SE
8
0.5
SE
8
0.4
SE
8
0.5
SE
8
0.4
W
14
Energy kJ
67
62
93
193
148
188
138
12
69
21
20
19
18
18
7
20
11
33
17
31
63
Swell 3
Height (m)
Direction
Period (s)
0.5
SE
9
0.4
SE
9
0.5
S
23
0.4
SSW
12
0.4
SW
12
0.3
SE
10
0.3
SE
9
0.2
SSW
11
0.3
SE
9
0.2
S
20
0.1
SE
10
0.1
NW
9
0.1
W
9
0.1
W
19
0.1
S
18
0.2
W
17
0.2
W
16
0.3
W
15
0.4
SE
8
Energy kJ
38
27
260
56
35
15
12
12
12
30
4
3
2
7
6
23
20
39
16
Wind waves
Height (m)
Direction
Period (s)
1.6
ENE
8
1.7
ENE
8
1.8
ENE
8
1.8
ENE
8
1.7
ENE
8
1.9
ENE
8
1.8
ENE
8
1.8
ENE
7
2.2
ENE
7
2.1
ENE
8
2
ENE
8
2.1
ENE
8
2.2
ENE
8
2
ENE
8
2.2
ENE
8
1.9
ENE
8
1.9
ENE
8
2
ENE
7
2
ENE
7
1.7
ENE
7
1.6
ENE
7
Energy kJ
302
347
382
372
345
389
353
344
516
469
471
501
559
451
526
397
411
417
405
319
258
Nearest Offshore or Glassy
Rating
(10 max)
2
2
2
3
3
3
3
3
3
3
3
2
3
3
3
3
3
3
2
1
1
Distance (km)
31
16
16
31
31
16
31
31
31
31
46
31
31
31
33
31
31
16
31
16
16
Best forecast wave conditions in Kaua'i
Rating
(10 max)
2
2
2
3
3
3
3
3
3
3
3
2
3
3
3
3
3
3
2
2
2
Best forecast wave conditions in United States
Rating
(10 max)
2
2
3
3
3
3
3
3
3
3
3
4
3
3
4
3
3
4
3
2
4
Header Global
Rating
(10 max)
5
5
5
4
5
9
7
5
6
8
7
5
5
9
9
9
5
6
6
7
7
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
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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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