Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Issued: 7 pm 03 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.1° 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 4 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 1.7m 8s period and expected on Saturday (Jul 04) at 8PM.

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

G’day, Rusty here. I’ve run the numbers on Ammonias, and it’s a grim picture, mate. We’re looking at a full 16-day stretch from Friday, July 3rd through Saturday, July 18th, and there’s not a single session I’d recommend. The pattern is all cross-shore winds and choppy, short-period windswell. A few days get flagged as “marginal,” but the quality’s just not there.

Starting on Friday, July 3rd: Ammonias has a 6 ft swell from the ENE with a short 8-second period. Wind is a solid 16 mph cross-shore from the ENE. Combined wave energy is 652 (moderate), but it’s called marginal – the wind’s ruining it.

Saturday, July 4th brings a long-period groundswell from the south, around 3 ft with a 20-21 second period. That’s good shape potential, but at a reef break like this, a long period can run a bit straight. The wind is still 16 mph cross-shore. Morning energy hits 1194 (strong), afternoon is 1018 (strong), but the wave comment is marginal. Crowds are likely here, so you’d be dealing with a mess. Water temp is 79°, pretty average for the season.

Sunday, July 5th: Swell from the SSW at 3 ft, 18-second period, but wind cranks up to 19 mph from the NE in the morning – lumpy cross-chop. Energy is 1081 (strong) in the morning, 903 (moderate) in the afternoon, with a “poor” call. Skip it.

Monday, July 6th: Swell jumps to 7 ft from the ENE, but period drops to 8 seconds – classic windswell. Wind is 16-19 mph cross-shore. Combined energy hits 1055 (moderate to strong), but it’s poor to marginal. At 7 ft, it’s too big for beginners, and with that chop, it’s for experts only. Honestly, the setup looks better for kite surfing than paddling.

Tuesday, July 7th through Thursday, July 9th is a rinse-and-repeat: consistent ENE swell around 6-7 ft, periods stuck at 7-8 seconds, cross-shore winds at 12-16 mph. Combined energy stays moderate (411-893), but wave calls are either “poor” or “marginal.” No clean windows.

From Friday, July 10th through Saturday, July 18th, it’s a long, bleak stretch. Swell drops to 2-3 ft from the SSW with longer periods (14-16 seconds) on a few days, but the wind never lets up – cross or cross-on from the ENE or NE at 12-16 mph. Combined energy falls to weak levels (188-379). The only flicker of hope is on Monday, July 13th and Tuesday, July 14th with some “marginal” calls, but the wind state and short-period windswell on the 14th kill it.

Bottom line: nothing’s worth paddling out for at Ammonias in this 16-day window. The consistent cross-shore winds and short-period swell are a bust. It’s a blank run, which isn’t unusual here when the trades lock in. Forecasts can change, so keep an eye out, but for now, leave the board at home.

Rusty.

Short Range Forecast

Moderate rain (total 13mm), heaviest on Fri night. Warm (max 25°C on Sat morning, min 23°C on Sun night). Mainly fresh winds.

Days 5-7 Weather Summary

Moderate rain (total 11mm), heaviest on Mon night. Warm (max 26°C on Thu afternoon, min 23°C on Wed night). Wind will be generally light.

Saturday
4
Sunday
5
Monday
6
Tuesday
7
Wednesday
8
Thursday
9
Fri
10
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
1
1
0
2
1
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.9
ENE
8
0.8
S
21
0.8
S
20
0.9
SSW
19
0.9
SSW
18
0.9
SSW
18
2.1
ENE
7
2.1
ENE
8
2.2
ENE
8
2.2
ENE
8
2.2
ENE
8
1.9
ENE
8
2
ENE
7
1.9
ENE
8
1.8
ENE
7
1.7
ENE
7
1.8
ENE
7
1.8
ENE
7
1.7
ENE
7
1.6
ENE
7
1.7
ENE
7
Wave Graph
Metric surfscale
Energy kJ
430
573
490
608
522
510
462
481
596
545
545
434
440
397
363
319
344
344
294
256
302
Wind (km/h)
25
ENE
25
ENE
25
NE
25
ENE
30
ENE
30
ENE
25
ENE
30
ENE
30
ENE
30
NE
30
ENE
30
NE
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
NE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross
cross
cross-on
cross
cross-on
cross
cross
High Tide
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
1:33PM0.67m
Low Tide
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
5:17AM-0.06m
rain showers
clear
part cloud
rain showers
rain showers
rain showers
rain showers
clear
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
rain showers
rain showers
part cloud
rain showers
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
5:58
5:58
5:58
6:00
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
7:23
 mm
3
2
2
2
2
2
2
1
1
2
1
3
1
1
Temp °C
24
25
25
24
24
25
24
25
25
24
25
25
24
25
25
24
25
26
24
25
25
Feels °C
23
24
23
23
23
24
22
23
23
22
23
23
23
24
23
23
24
26
23
23
23
Swell 1
Height (m)
Direction
Period (s)
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
S
13
0.7
S
13
0.6
S
12
0.6
S
12
0.5
S
12
0.6
S
12
0.5
S
11
Energy kJ
147
573
490
608
522
510
432
446
481
355
350
341
261
247
229
168
112
108
75
99
66
Swell 2
Height (m)
Direction
Period (s)
0.5
SSW
13
0.6
SSW
16
0.6
SSW
15
0.7
SSW
15
0.6
SSW
14
0.4
SE
9
0.4
SSW
13
0.4
SE
9
0.4
SE
9
0.4
SE
9
0.4
SE
8
0.3
SE
8
0.4
SE
8
0.4
SE
8
0.5
SE
8
0.5
SE
8
0.4
SE
8
0.4
SE
8
0.4
SE
6
0.4
W
14
0.4
W
14
Energy kJ
93
193
148
188
138
20
68
20
20
19
18
11
18
25
32
32
17
23
9
65
64
Swell 3
Height (m)
Direction
Period (s)
0.5
S
23
0.4
SSW
12
0.4
SW
12
0.4
SE
10
0.3
SE
9
0.2
SSW
11
0.3
SE
9
0.2
S
20
0.1
SE
10
0.1
S
11
0.1
SE
11
0.2
S
18
0.1
S
18
0.2
W
15
0.2
W
14
0.3
W
14
0.3
SE
8
0.4
SE
8
0.4
SE
8
Energy kJ
260
56
35
24
13
12
12
30
4
2
4
25
6
17
15
32
9
16
17
Wind waves
Height (m)
Direction
Period (s)
1.9
ENE
8
1.8
ENE
8
1.6
ENE
8
1.8
ENE
8
2
ENE
8
2
ENE
7
2.1
ENE
7
2.1
ENE
8
2.2
ENE
8
2.2
ENE
8
2.2
ENE
8
1.9
ENE
8
2
ENE
7
1.9
ENE
8
1.8
ENE
7
1.7
ENE
7
1.8
ENE
7
1.8
ENE
7
1.7
ENE
7
1.6
ENE
7
1.7
ENE
7
Energy kJ
430
392
310
382
441
435
462
481
596
545
545
434
440
397
363
319
344
344
294
256
302
Nearest Offshore or Glassy
Rating
(10 max)
2
2
3
3
3
3
3
2
3
3
2
3
3
3
3
3
2
2
2
1
2
Distance (km)
16
16
31
31
16
31
31
38
33
38
31
31
33
16
31
31
16
31
16
16
31
Best forecast wave conditions in Kaua'i
Rating
(10 max)
2
2
3
3
3
3
3
2
3
3
2
3
3
3
3
3
2
2
2
2
2
Best forecast wave conditions in United States
Rating
(10 max)
2
3
3
3
3
3
3
3
3
3
4
3
3
4
3
3
4
3
2
4
3
Header Global
Rating
(10 max)
7
5
5
5
9
7
7
5
8
7
5
6
9
8
9
8
5
5
5
4
9
  • 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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