Portmarnock
Port Mearnóg
Tide curve for the next twenty hours. Low water 02:25 at -1.00 metres. High water 08:50 at 0.93 metres. Low water 14:40 at -0.80 metres. High water 20:50 at 1.19 metres.
No official station here. These are the Marine Institute's predictions for Howth, 6 km away. Times at Portmarnock differ by a few minutes. We do not invent a local correction, because a made up offset is worse than a stated approximation.
Today · Wednesday, 21 October
Mid rangeRange 2.19 m
- 02:25 Low water -1.00 m
- 08:50 High water 0.93 m
- 14:40 Low water -0.80 m
- 20:50 High water 1.19 m
Best window today
Outside the window right now. Next high water 08:50. 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
Portmarnock faces E. A W wind is blowing off the land, cleaner wave faces but anything floating is pushed out to sea.
Seven day table
Source station Howth| Day | Tide | Time | Height |
|---|---|---|---|
| Wednesday, 21 October | Low | 02:25 | -1.00 m |
| High | 08:50 | 0.93 m | |
| Low | 14:40 | -0.80 m | |
| High | 20:50 | 1.19 m | |
| Thursday, 22 October | Low | 03:15 | -1.23 m |
| High | 09:45 | 1.14 m | |
| Low | 15:30 | -1.04 m | |
| High | 21:45 | 1.39 m | |
| Friday, 23 October | Low | 03:55 | -1.45 m |
| High | 10:25 | 1.35 m | |
| Low | 16:05 | -1.29 m | |
| High | 22:25 | 1.58 m | |
| Saturday, 24 October | Low | 04:30 | -1.66 m |
| High | 11:00 | 1.52 m | |
| Low | 16:40 | -1.52 m | |
| High | 23:05 | 1.74 m | |
| Sunday, 25 October | Low | 04:00 | -1.82 m |
| High | 10:35 | 1.66 m | |
| Low | 16:15 | -1.72 m | |
| High | 22:45 | 1.86 m | |
| Monday, 26 October | Low | 04:35 | -1.94 m |
| High | 11:10 | 1.75 m | |
| Low | 16:50 | -1.87 m | |
| High | 23:20 | 1.92 m | |
| Tuesday, 27 October | Low | 05:10 | -2.00 m |
| High | 11:45 | 1.81 m | |
| Low | 17:25 | -1.95 m |
Questions
What time is high tide at Portmarnock today?
Today's times are 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.