Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 13 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.3° 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 13 Jul 2026:

  • Most powerful swell: Sunday 19 Jul, 2PM (local time) - 6ft (1.8m), 7s period, E swell with 338 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.8m 7s and forecast to arrive on Sunday (Jul 19) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 7s period and expected on Tuesday (Jul 14) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2PM (Sun 19th Jul)6ft (1.8m) 7s

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


The Lowdown

Hey crew, Rusty here, checking in on Ammonias. Gotta be honest, the next couple of weeks look pretty bleak. The water's sitting at a typical 79°, so nothing weird there, just a whole lot of nothing happening in the surf.

Looking at Monday the 13th, there's a 6ft swell from the ENE, but it's sloppy – only an 8-second period and a 25 km/h crosswind making for a choppy mess. The energy's moderate (711), but it ain't clean.

It really goes downhill from there. Tuesday the 14th drops into tiny, poor surf, and that's the pattern for days. Wednesday the 15th sees a bump to 5ft, but the wind's onshore and choppy with a short 7-second period. Through the rest of the week and into the weekend of the 20th, it's the same story – cross or cross-on winds, short-period swell, and marginal conditions. The energy varies from weak (118 on Wednesday afternoon) to moderate (518 on Sunday), but the quality just isn't there.

There's a glimmer near the end of the month. Monday the 27th afternoon shows a 3ft east swell with a long 15-second period and a gentle cross-shore breeze – that'll get clean. The energy's solid (579). Tuesday the 28th morning has 5ft from the east at 13 seconds, though it's a bit onshore and choppy. But Tuesday afternoon bumps to 5ft with that same gentle cross-shore wind, and the energy rockets up to 950 – that's a lot of power for this reef. This late groundswell is the only real standout, but it's nearly two weeks out, so don't pack your bags yet.

Given all the short-period chop and onshore wind, this stretch looks more interesting for a kite surfer than a paddle surfer. For the rest of us, it's a whole lot of waiting until maybe the very end of July.

Hang in there.
Rusty

Short Range Forecast

Moderate rain (total 14mm), heaviest on Wed afternoon. Warm (max 26°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 14mm), heaviest on Sat morning. Warm (max 26°C on Thu afternoon, min 24°C on Thu night). Wind will be generally light.

Monday
13
Tuesday
14
Wednesday
15
Thursday
16
Friday
17
Saturday
18
Sunday
19
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
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.8
ENE
8
1.5
ENE
8
1.5
ENE
7
0.7
SW
14
0.7
SW
14
0.6
SSW
17
1.4
ENE
7
1.1
ENE
7
0.8
SSW
16
0.6
SSW
16
0.6
SSW
17
0.7
SSW
14
1.6
ENE
7
1.5
ENE
7
1.3
ENE
6
1.6
ENE
6
1.6
ENE
7
1.5
E
6
1.7
E
7
1.7
ENE
7
1.6
ENE
7
Wave Graph
Metric surfscale
Energy kJ
373
268
222
189
186
200
202
118
314
179
195
194
232
204
125
201
237
188
286
319
212
Wind (km/h)
25
ENE
25
NE
20
NE
25
NE
20
ENE
15
NE
20
E
15
E
15
E
20
E
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
25
ENE
25
ENE
20
NE
25
ENE
25
NE
15
NE
Wind State
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-on
cross
cross
cross
cross
cross
High Tide
3:47PM0.78m
3:04AM0.21m
4:29PM0.77m
3:58AM0.23m
5:08PM0.73m
4:55AM0.26m
5:45PM0.67m
5:57AM0.28m
6:18PM0.59m
7:07AM0.31m
6:48PM0.51m
8:26AM0.35m
7:13PM0.43m
Low Tide
11:06PM0.11m
8:46AM-0.10m
11:38PM0.10m
9:34AM-0.07m
00:10AM0.09m
10:22AM-0.02m
00:42AM0.08m
11:11AM0.05m
1:14AM0.06m
12:04PM0.14m
1:46AM0.05m
1:11PM0.23m
2:18AM0.05m
clear
clear
rain showers
rain showers
clear
clear
part cloud
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
part cloud
rain showers
rain showers
rain showers
clear
part cloud
rain showers
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
6:01
6:03
6:03
6:03
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:23
7:22
7:22
7:22
7:22
7:22
7:22
 mm
1
2
4
7
2
1
2
3
4
2
1
Temp °C
25
26
24
25
25
24
25
25
24
25
26
25
26
26
25
26
26
25
25
25
24
Feels °C
24
25
23
24
24
24
25
26
25
26
27
25
26
26
25
26
26
25
24
24
23
  • 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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