Beach
Portstewart Strand
Northern Ireland · United Kingdom · Atlantic Ocean
55.1697, -6.7654 · Castlerock, 2 km
- 14°Sea · September
- 17°High · July
- 7.0 hSunshine · May
Your month at the beach
Portstewart Strand in January
- 6°CAir, daytime high3°C at night
- 9°CSea temperature
- 0.6 hSunshine a day
- 21 daysRainy days in the month110 mm in total
- 27 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
Portstewart Strand in February
- 7°CAir, daytime high3°C at night
- 8°CSea temperature
- 2.2 hSunshine a day
- 18 daysRainy days in the month86 mm in total
- 25 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
Portstewart Strand in March
- 8°CAir, daytime high3°C at night
- 8°CSea temperature
- 3.8 hSunshine a day
- 18 daysRainy days in the month84 mm in total
- 24 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
Portstewart Strand in April
- 10°CAir, daytime high5°C at night
- 8°CSea temperature
- 6.0 hSunshine a day
- 17 daysRainy days in the month69 mm in total
- 21 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
Portstewart Strand in May
- 13°CAir, daytime high7°C at night
- 10°CSea temperature
- 7.0 hSunshine a day
- 16 daysRainy days in the month86 mm in total
- 20 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
Portstewart Strand in June
- 16°CAir, daytime high10°C at night
- 11°CSea temperature
- 6.3 hSunshine a day
- 18 daysRainy days in the month97 mm in total
- 18 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
Portstewart Strand in July
- 17°CAir, daytime high11°C at night
- 13°CSea temperature
- 5.6 hSunshine a day
- 21 daysRainy days in the month108 mm in total
- 18 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
Portstewart Strand in August
- 17°CAir, daytime high11°C at night
- 14°CSea temperature
- 5.0 hSunshine a day
- 21 daysRainy days in the month117 mm in total
- 19 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
Portstewart Strand in September
- 15°CAir, daytime high10°C at night
- 14°CSea temperature
- 3.7 hSunshine a day
- 18 daysRainy days in the month92 mm in total
- 21 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
Portstewart Strand in October
- 12°CAir, daytime high8°C at night
- 13°CSea temperature
- 2.3 hSunshine a day
- 20 daysRainy days in the month119 mm in total
- 23 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
Portstewart Strand in November
- 9°CAir, daytime high6°C at night
- 12°CSea temperature
- 0.9 hSunshine a day
- 21 daysRainy days in the month117 mm in total
- 24 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
Portstewart Strand in December
- 7°CAir, daytime high4°C at night
- 10°CSea temperature
- 0.4 hSunshine a day
- 21 daysRainy days in the month112 mm in total
- 25 km/hAverage wind
Averages for 1991–2020. A rainy day is a day with at least 1 mm of rain.
The beach itself
- 12Places to stay within 5 kmHotels, guest houses, apartments and campsites · OpenStreetMap Places to stay near Portstewart Strand ↗
- 29 kmAirport: City of Derry Airport (LDY)In a straight line; by road it is further Car hire at City of Derry Airport (LDY) ↗
No reliable information yet on: bathing water quality, wheelchair access, lifeguards.
Some links above are affiliate links: if you book through them we may earn a commission, at no extra cost to you. It never changes what the data on this page says.
January from 2020 to 2025
In January 2025 the sea averaged 9.5 °C — 0.7 °C above the 1991–2020 average.
1991–2020 average: 8.8 °C
1991–2020 average: 6.4 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
February from 2020 to 2025
In February 2025 the sea averaged 8.7 °C — 0.6 °C above the 1991–2020 average.
1991–2020 average: 8.1 °C
1991–2020 average: 6.6 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
March from 2020 to 2025
In March 2025 the sea averaged 8.7 °C — 0.8 °C above the 1991–2020 average.
1991–2020 average: 7.9 °C
1991–2020 average: 8.0 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
April from 2020 to 2025
In April 2025 the sea averaged 9.4 °C — 1.0 °C above the 1991–2020 average.
1991–2020 average: 8.4 °C
1991–2020 average: 10.4 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
May from 2020 to 2025
In May 2025 the sea averaged 10.8 °C — 1.3 °C above the 1991–2020 average.
1991–2020 average: 9.5 °C
1991–2020 average: 13.1 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
June from 2020 to 2025
In June 2025 the sea averaged 12.6 °C — 1.4 °C above the 1991–2020 average.
1991–2020 average: 11.2 °C
1991–2020 average: 15.6 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
July from 2020 to 2025
In July 2025 the sea averaged 14.1 °C — 1.2 °C above the 1991–2020 average.
1991–2020 average: 12.9 °C
1991–2020 average: 17.0 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
August from 2020 to 2025
In August 2025 the sea averaged 15.2 °C — 1.1 °C above the 1991–2020 average.
1991–2020 average: 14.1 °C
1991–2020 average: 16.7 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
September from 2020 to 2025
In September 2025 the sea averaged 14.9 °C — 0.7 °C above the 1991–2020 average.
1991–2020 average: 14.2 °C
1991–2020 average: 15.1 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
October from 2020 to 2025
In October 2025 the sea averaged 13.8 °C — 0.5 °C above the 1991–2020 average.
1991–2020 average: 13.3 °C
1991–2020 average: 12.1 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
November from 2020 to 2025
In November 2025 the sea averaged 12.8 °C — 1.0 °C above the 1991–2020 average.
1991–2020 average: 11.8 °C
1991–2020 average: 9.0 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
December from 2020 to 2025
In December 2025 the sea averaged 10.8 °C — 0.6 °C above the 1991–2020 average.
1991–2020 average: 10.2 °C
1991–2020 average: 7.0 °C
Each bar is one year. Above the dashed line (the 1991–2020 average), that month was warmer than usual; below it, cooler.
When to go
1991–2020 averagesThe year at a glance
- Jan9°1 h110 mm
- Feb8°2 h86 mm
- Mar8°4 h84 mm
- Apr8°6 h69 mm
- May10°7 h86 mm
- Jun11°6 h97 mm
- Jul13°6 h108 mm
- Aug14°5 h117 mm
- Sep14°4 h92 mm
- Oct13°2 h119 mm
- Nov12°1 h117 mm
- Dec10°0 h112 mm
Each card is a month. The colour is the sea temperature, on the same scale as the map; in bold, the two best months for each.
Sea temperature
1991–2020 averagesClimate through the year
1991–2020 averagesRain
Sunshine
Sunshine hours are estimated from measured solar radiation, not observed directly.
Month by month
1991–2020 averagesEvery month at Portstewart Strand: air, sea, rain and sunshine. Averages for 1991–2020.
| Month | High°C | Low°C | Sea°C | Rainmm | Rainy daysdays | Sunshineh/day | Windkm/h |
|---|---|---|---|---|---|---|---|
| January | 6 | 3 | 9 | 110 | 21 | 0.6 | 27 |
| February | 7 | 3 | 8 | 86 | 18 | 2.2 | 25 |
| March | 8 | 3 | 8 | 84 | 18 | 3.8 | 24 |
| April | 10 | 5 | 8 | 69 | 17 | 6.0 | 21 |
| May | 13 | 7 | 10 | 86 | 16 | 7.0 | 20 |
| June | 16 | 10 | 11 | 97 | 18 | 6.3 | 18 |
| July | 17 | 11 | 13 | 108 | 21 | 5.6 | 18 |
| August | 17 | 11 | 14 | 117 | 21 | 5.0 | 19 |
| Septemberwarmest sea | 15 | 10 | 14 | 92 | 18 | 3.7 | 21 |
| October | 12 | 8 | 13 | 119 | 20 | 2.3 | 23 |
| November | 9 | 6 | 12 | 117 | 21 | 0.9 | 24 |
| December | 7 | 4 | 10 | 112 | 21 | 0.4 | 25 |
Swipe sideways to see the other columns.
Photos
Photos shared by their authors on Wikimedia Commons, with its colours adjusted.
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Plan your trip
Some links above are affiliate links: if you book through them we may earn a commission, at no extra cost to you. It never changes what the data on this page says.
About these numbers
Averages are for 1991–2020; the recent years (2020–2025) are what actually happened. Neither is today's weather.
The nearest sea measurement point is 24 km away, so this figure is less precise here.
| What | Where it comes from | Nearest measurement |
|---|---|---|
| Air, rain and sunshine | NASA POWER | 20 km away |
| Sea temperature | NOAA OISST v2.1, 1991–2020 | 24 km away |
| 2020–2025, month by month | NASA POWER · NOAA OISST v2.1 | 20 km away |
| Lifeguards and places to stay | OpenStreetMap | within 1–5 km |
| Nearest airport | OurAirports | straight-line distance |
| Image at the top | Sentinel-2 cloudless (EOX) | at this spot |
More about this place: Wikipedia See every data source →