Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 17 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.5° C
0.2° 

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


Ammonias surf forecast from 17 Jul 2026:

  • Most powerful swell: Thursday 23 Jul, 8PM (local time) - 3.5ft (1.0m), 19s period, SSW swell with 708 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.0m 19s and forecast to arrive on Thursday (Jul 23) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 14s period and expected on Friday (Jul 17) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Thu 23rd Jul)3.5ft (1.0m) 19s

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


The Lowdown

Alright, Rusty here. Let’s keep it real: the next 16 days at Ammonias are mostly a bust. The wind is stuck out of the ENE, so it’s side or side-on for this reef, and that’s a deal-breaker for clean waves. Water temp is about normal for this time of year.

The first ten days are ugly. Cross-chop and onshore slop, with the swell all over the place. Don’t even bother.

The only glimmer of hope shows up on Wednesday, July 29th. By the afternoon, we’ve got a 7ft groundswell from the ENE, period at 13 seconds, and the wind eases up to a light side breeze from the NE. The energy in the water is massive at 2990. That’s the best wave of the whole forecast. It’s big, though – over 7ft – so that’s expert-only stuff. The morning is still a bit choppy, but the afternoon is your window.

After that, it’s back to small, windy junk again by the end of the month. That Wednesday afternoon is the one and only highlight. Don’t hold your breath for anything else.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Fri night. Warm (max 26°C on Fri morning, min 23°C on Sat night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 5mm), mostly falling on Tue night. Warm (max 26°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light.

Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
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
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.4
ENE
7
1.5
ENE
7
1.4
ENE
7
1.6
ENE
7
1.6
ENE
7
1.7
ENE
8
1.5
ENE
8
1.5
ENE
7
0.5
S
18
1.3
ENE
8
0.6
S
16
0.6
S
15
0.9
S
15
0.9
S
14
1
S
13
0.6
SSW
24
0.6
SSW
23
0.7
SSW
22
0.8
SSW
20
0.7
SSW
20
0.9
SSW
18
Wave Graph
Metric surfscale
Energy kJ
175
196
187
220
247
318
250
222
175
191
188
163
343
316
352
437
426
480
528
399
469
Wind (km/h)
20
ENE
20
ENE
20
ENE
25
ENE
25
ENE
20
ENE
20
ENE
25
NE
20
ENE
20
ENE
20
NE
15
NE
20
ENE
20
ENE
20
ENE
20
E
20
ENE
20
E
25
ENE
25
ENE
20
ENE
Wind State
cross
cross
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
High Tide
6:18PM0.59m
7:07AM0.31m
6:48PM0.51m
8:26AM0.35m
7:13PM0.43m
9:50AM0.41m
7:25PM0.35m
11:06AM0.46m
12:06PM0.52m
12:55PM0.57m
Low Tide
11:11AM0.05m
1:14AM0.06m
12:04PM0.14m
1:46AM0.05m
1:11PM0.23m
2:18AM0.05m
2:53PM0.29m
2:52AM0.04m
3:30AM0.04m
4:16AM0.04m
clear
clear
rain showers
rain showers
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
clear
rain showers
rain showers
clear
rain showers
part cloud
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:03
6:03
6:03
6:05
6:05
6:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:22
7:22
7:22
7:22
7:22
7:21
7:21
 mm
1
1
2
1
2
2
Temp °C
26
26
25
26
26
25
25
26
24
25
26
24
25
26
24
25
26
25
25
26
24
Feels °C
26
26
26
26
26
25
24
25
23
24
26
23
25
26
24
25
25
25
24
25
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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