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Where these times come from. There is no official tide station at Portmarnock.
These are the Marine Institute's predictions for Howth, the nearest
official station, 6 km away. Times at Portmarnock will differ by a few minutes. We do not invent a local
correction, because a made up offset is worse than a stated approximation.
Today: Saturday, 12 September
High water
00:40
2.04 m
Low water
06:30
-2.22 m
High water
13:05
1.67 m
Low water
18:40
-1.97 m
Spring tideRange 4.26 m
Best window for a swim or sauna
10:05 – 14:35
You are inside the window now. Next high water 13:05.
This is a shallow shelving strand, so the sea moves a long way. The usable window runs from about three hours before high water to an hour and a half after.
Wind and sea
12 kn
Wind SW · Moderate breeze
Offshore
Wind on shore
26 kn
Max gust today
16.4°C
Sea temp
Offshore. Portmarnock faces E, so a SW wind is blowing off the land, cleaner wave faces but anything floating is pushed out to sea.
Portmarnock tide table, next 7 days
| Date | Tide | Time | Height |
|---|---|---|---|
| Saturday, 12 September | High | 00:40 | 2.04 m |
| Low | 06:30 | -2.22 m | |
| High | 13:05 | 1.67 m | |
| Low | 18:40 | -1.97 m | |
| Sunday, 13 September | High | 01:20 | 2.03 m |
| Low | 07:05 | -2.17 m | |
| High | 13:40 | 1.65 m | |
| Low | 19:15 | -1.96 m | |
| Monday, 14 September | High | 02:00 | 1.94 m |
| Low | 07:45 | -2.03 m | |
| High | 14:15 | 1.58 m | |
| Low | 19:55 | -1.85 m | |
| Tuesday, 15 September | High | 02:35 | 1.77 m |
| Low | 08:20 | -1.82 m | |
| High | 14:50 | 1.48 m | |
| Low | 20:35 | -1.66 m | |
| Wednesday, 16 September | High | 03:15 | 1.53 m |
| Low | 09:00 | -1.55 m | |
| High | 15:30 | 1.34 m | |
| Low | 21:15 | -1.40 m | |
| Thursday, 17 September | High | 03:55 | 1.25 m |
| Low | 09:40 | -1.25 m | |
| High | 16:10 | 1.17 m | |
| Low | 22:05 | -1.11 m | |
| Friday, 18 September | High | 04:40 | 0.97 m |
| Low | 10:30 | -0.95 m | |
| High | 17:05 | 1.00 m | |
| Low | 23:10 | -0.86 m |
Source station Howth. Heights are metres relative to Ordnance Datum Malin. Why that matters.
Portmarnock tide questions
- What time is high tide at Portmarnock today?
- Today's high water times are shown at the top of this page, taken from the Howth station 6 km away. There are two high waters roughly every 24 hours and 50 minutes, and local times at Portmarnock differ from the station by a few minutes.
- Is there an official tide station at Portmarnock?
- No. The Marine Institute does not predict for Portmarnock directly. The nearest official station is Howth, 6 km away, and that is what these times come from. We do not apply an invented local correction.
- What is the best tide for swimming at Portmarnock?
- This is a shallow shelving strand, so the sea moves a long way. The usable window runs from about three hours before high water to an hour and a half after.
- Which way does Portmarnock face?
- Portmarnock faces E, so a wind from that direction is onshore and a wind from the opposite side is offshore.