Portstewart (County Londonderry) weather

Find a forecast

Forecast days

Tue 18 Aug

Maximum daytime temperature: 17° Celsius; Minimum nighttime temperature: 12° Celsius;

Sunrise: 06:07

Sunset: 20:54
Light showers.

M UV

L Pollution

L Pollen
Next low tide: 05:13 for
Portrush (Beach)
Portrush - Mill (West) Strand (Beach)

2.8 miles
Tue 18 Aug

Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius;
Wed 19 Aug

Maximum daytime temperature: 17° Celsius; Minimum nighttime temperature: 12° Celsius;

Sunrise: 06:09

Sunset: 20:51
Light rain changing to cloudy by nighttime.

M UV

L Pollution

L Pollen
First high tide: 11:58 for
Portrush (Beach)
Portrush - Mill (West) Strand (Beach)

2.8 miles
Wed 19 Aug

Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius;
Thu 20 Aug

Maximum daytime temperature: 16° Celsius; Minimum nighttime temperature: 12° Celsius;

Sunrise: 06:10

Sunset: 20:49
Light showers changing to sunny intervals by late morning.

H UV

L Pollution

L Pollen
First high tide: 01:58 for
Portrush (Beach)
Portrush - Mill (West) Strand (Beach)

2.8 miles
Thu 20 Aug

Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius;
Fri 21 Aug

Maximum daytime temperature: 16° Celsius; Minimum nighttime temperature: 11° Celsius;

Sunrise: 06:12

Sunset: 20:46
Sunny intervals changing to partly cloudy by nighttime.

H UV

L Pollution

L Pollen
First high tide: 03:39 for
Portrush (Beach)
Portrush - Mill (West) Strand (Beach)

2.8 miles
Fri 21 Aug

Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 11 degrees Celsius;
Sat 22 Aug

Maximum daytime temperature: 16° Celsius; Minimum nighttime temperature: 11° Celsius;

Sunrise: 06:14

Sunset: 20:44
Sunny intervals changing to partly cloudy by nighttime.

M UV

No pollution data.

No pollen data.
First high tide: 04:42 for
Portrush (Beach)
Portrush - Mill (West) Strand (Beach)

2.8 miles
Sat 22 Aug

Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 11 degrees Celsius;
Sun 23 Aug

Maximum daytime temperature: 17° Celsius; Minimum nighttime temperature: 10° Celsius;

Sunrise: 06:16

Sunset: 20:42
Sunny intervals.

M UV

No pollution data.

No pollen data.
First high tide: 05:32 for
Portrush (Beach)
Portrush - Mill (West) Strand (Beach)

2.8 miles
Sun 23 Aug

Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius;
Mon 24 Aug

Maximum daytime temperature: 19° Celsius; Minimum nighttime temperature: 13° Celsius;

Sunrise: 06:18

Sunset: 20:39
Sunny changing to partly cloudy by nighttime.

M UV

No pollution data.

No pollen data.
First high tide: 06:10 for
Portrush (Beach)
Portrush - Mill (West) Strand (Beach)

2.8 miles
Mon 24 Aug

Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 13 degrees Celsius;

Light showers.

Sunrise: 06:07

Sunset: 20:54

M UV

L Pollution

L Pollen

Next low tide: 05:13 for

Portrush (Beach)

7 day forecast for Portstewart

Tuesday (18 August 2026)

Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Weather symbols
Chance of precipitation	30%	60%	50%	80%	90%	60%	70%	70%	70%	90%	70%	80%	80%	80%	80%	80%	70%	80%	70%	70%	70%	70%	60%	40%
Temperature (°C)	16°	16°	15°	15°	15°	14°	14°	14°	15°	15°	15°	16°	16°	16°	16°	16°	16°	16°	16°	15°	15°	14°	14°	13°
Feels like temperature (°C)	13°	12°	12°	11°	11°	11°	11°	11°	12°	12°	12°	13°	13°	13°	13°	13°	13°	13°	13°	13°	12°	12°	11°	11°
Wind direction and speed (mph)	W 19	W 19	W 19	W 19	W 18	W 18	W 17	WSW 16	WSW 16	WSW 18	WSW 18	W 18	W 18	W 18	W 18	W 18	W 17	W 16	W 16	WSW 16	WSW 16	WSW 14	SW 13	SW 13
Wind gust (mph)	28	30	28	26	25	24	22	23	23	26	27	27	28	27	27	26	25	24	23	22	19	20	19	20
Visibility (description)	G	G	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG
Humidity	92%	90%	87%	86%	88%	85%	85%	86%	85%	85%	84%	81%	80%	80%	77%	77%	77%	77%	80%	78%	81%	83%	83%	85%
UV	-	-	-	-	-	-	1	1	1	2	2	2	3	4	4	2	2	2	1	1	1	-	-	-

Wednesday (19 August 2026)

Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Weather symbols
Chance of precipitation	40%	50%	50%	60%	60%	70%	60%	80%	80%	80%	80%	90%	90%	≥95%	≥95%	≥95%	90%	80%	80%	60%	60%	50%	40%	50%
Temperature (°C)	13°	13°	13°	13°	12°	12°	12°	13°	13°	14°	14°	15°	16°	16°	16°	16°	15°	15°	15°	15°	15°	14°	14°	14°
Feels like temperature (°C)	11°	11°	10°	10°	10°	10°	10°	10°	11°	12°	12°	13°	14°	14°	15°	15°	15°	14°	14°	14°	13°	12°	12°	12°
Wind direction and speed (mph)	SW 13	SW 14	SW 14	SW 14	SW 13	SSW 13	SSW 13	SSW 13	SSW 13	SSW 13	SSW 13	SW 11	SW 10	WSW 9	WSW 7	W 7	NNW 8	N 9	NNE 8	N 8	N 8	N 9	NNE 10	NNE 11
Wind gust (mph)	20	20	20	19	20	20	20	21	21	21	20	19	17	16	15	13	13	13	13	12	12	14	15	16
Visibility (description)	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG
Humidity	85%	85%	85%	85%	85%	85%	86%	86%	85%	85%	85%	84%	85%	84%	84%	85%	86%	86%	86%	86%	85%	85%	85%	85%
UV	-	-	-	-	-	-	1	1	1	1	2	2	3	3	4	4	3	2	1	1	1	-	-	-

Thursday (20 August 2026)

Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Weather symbols
Chance of precipitation	40%	40%	50%	50%	50%	50%	50%	50%	50%	40%	30%	20%	20%	10%	10%	10%	20%	20%	20%	20%	20%	20%	20%	30%
Temperature (°C)	14°	14°	13°	13°	13°	13°	13°	13°	13°	14°	14°	14°	15°	15°	15°	15°	15°	15°	15°	15°	14°	14°	14°	14°
Feels like temperature (°C)	11°	11°	11°	10°	10°	10°	10°	10°	10°	10°	11°	11°	12°	12°	12°	12°	12°	12°	11°	11°	11°	10°	10°	10°
Wind direction and speed (mph)	NNE 14	NNE 14	NNE 15	NNE 16	NNE 16	NNE 18	NNE 18	NNE 18	NNE 18	NNE 17	NNE 17	NNE 17	N 17	N 16	N 17	N 18	N 19	N 19	N 19	N 19	N 19	N 19	N 19	N 19
Wind gust (mph)	16	19	20	21	22	22	22	22	22	22	23	24	25	25	25	26	26	25	26	25	24	23	23	23
Visibility (description)	VG	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E
Humidity	85%	85%	85%	84%	84%	84%	85%	83%	79%	77%	76%	75%	74%	74%	74%	73%	74%	75%	74%	72%	72%	72%	72%	73%
UV	-	-	-	-	-	-	1	1	1	2	3	5	5	6	5	4	3	2	1	1	1	-	-	-

Friday (21 August 2026)

Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Weather symbols
Chance of precipitation	30%	30%	40%	40%	40%	40%	40%	30%	30%	30%	30%	20%	20%	20%	20%	20%	20%	20%	20%	10%	10%	10%	10%	20%
Temperature (°C)	13°	13°	13°	13°	13°	12°	12°	12°	13°	13°	14°	14°	15°	15°	15°	15°	15°	15°	15°	14°	14°	14°	13°	13°
Feels like temperature (°C)	10°	10°	10°	10°	10°	9°	9°	9°	10°	10°	11°	11°	12°	12°	12°	12°	12°	12°	12°	11°	11°	11°	10°	10°
Wind direction and speed (mph)	N 19	N 18	N 18	N 17	N 16	N 17	N 16	N 17	N 17	N 17	N 16	N 16	N 15	N 15	N 15	N 15	N 16	N 16	N 16	N 16	N 16	N 16	N 16	N 16
Wind gust (mph)	22	21	22	21	21	21	21	20	21	22	22	22	22	22	23	23	22	22	22	20	19	18	17	17
Visibility (description)	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E
Humidity	73%	73%	74%	73%	73%	73%	74%	72%	72%	70%	71%	71%	67%	67%	67%	68%	69%	69%	69%	70%	67%	70%	71%	73%
UV	-	-	-	-	-	-	1	1	1	2	3	4	5	6	5	4	3	2	1	1	1	-	-	-

Saturday (22 August 2026)

Time	00:00	01:00	04:00	07:00	10:00	13:00	16:00	19:00	22:00
Weather symbols
Chance of precipitation	20%	20%	20%	20%	20%	10%	10%	<5%	<5%
Temperature (°C)	13°	13°	12°	12°	15°	16°	16°	15°	12°
Feels like temperature (°C)	10°	10°	10°	10°	13°	14°	14°	13°	10°
Wind direction and speed (mph)	N 16	N 16	N 15	N 13	NNW 12	NNW 11	NNW 13	NNW 11	NNW 10
Wind gust (mph)	17	18	17	18	19	19	19	17	14
Visibility (description)	E	E	VG	VG	VG	VG	VG	VG	VG
Humidity	72%	72%	74%	74%	74%	73%	74%	76%	78%
UV	-	-	-	1	3	5	3	1	-

Sunday (23 August 2026)

Time	01:00	04:00	07:00	10:00	13:00	16:00	19:00	22:00
Weather symbols
Chance of precipitation	10%	10%	10%	20%	10%	10%	<5%	<5%
Temperature (°C)	12°	11°	11°	15°	17°	17°	16°	12°
Feels like temperature (°C)	10°	9°	9°	14°	15°	16°	15°	10°
Wind direction and speed (mph)	NW 9	NW 8	NW 8	NNW 9	NNW 9	N 8	NNE 8	NNE 9
Wind gust (mph)	13	12	11	12	13	13	11	10
Visibility (description)	G	VG	G	VG	VG	VG	VG	VG
Humidity	80%	78%	79%	77%	73%	71%	74%	76%
UV	-	-	1	3	5	3	1	-

Monday (24 August 2026)

Time	01:00	04:00	07:00	10:00	13:00	16:00	19:00	22:00
Weather symbols
Chance of precipitation	<5%	<5%	<5%	10%	10%	10%	10%	20%
Temperature (°C)	11°	10°	11°	15°	18°	18°	17°	14°
Feels like temperature (°C)	9°	8°	8°	12°	15°	15°	14°	11°
Wind direction and speed (mph)	E 10	SSE 11	SSE 12	SE 15	SE 16	ESE 15	ESE 15	ESE 15
Wind gust (mph)	11	13	13	17	17	18	16	17
Visibility (description)	VG	VG	VG	VG	VG	VG	VG	VG
Humidity	80%	83%	86%	79%	71%	67%	72%	77%
UV	-	-	1	3	6	3	1	-

UK video forecast

Portstewart weather map

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Northern Ireland weather forecast

Headline:

Rain clears Monday evening. Scattered showers and bright spells Tuesday.

This Evening and Tonight:

A band of heavy rain spreads east this evening, quickly clearing to leave the rest of the night mainly dry with just the chance of a few light showers. Minimum temperature 14 °C.

Tuesday:

A bright but rather breezy day with a few bright spells between scattered showers. Feeling rather chilly. Maximum temperature 18 °C.

Outlook for Wednesday to Friday:

Heavy showers on Wednesday with a risk of thunder. Bright or sunny spells and scattered showers thereafter, becoming isolated by Friday. Remaining cool throughout.

Updated: 16:00 (UTC+1) on Mon 17 Aug 2026

UK long range weather forecast

This period is likely to start largely dry and settled across the UK, as a ridge of high pressure sets in. A few showers are likely in the far north and possibly the far southeast though. Conditions look like turning increasingly unsettled through next week, as low pressure gradually becomes dominant, squeezing the ridge off to the northeast and southwest. Most places are likely to see some rain or showers, which may be heavy with a risk of thunder at times. It may become breezy if not windy at times too. Temperatures are likely to be near or a little below normal overall, with some chilly nights at first, but brief warm, humid spells are possible at times, especially in the south.

Updated: 13:00 (UTC+1) on Mon 17 Aug 2026

As we move into the start of meteorological autumn, signals for the prevailing weather patterns affecting the UK are weak, thus something close to the climatological norm is most likely. This means a broad northwest-southeast split in conditions, with higher pressure becoming centred close to the south of the UK and lower pressure towards the north and northwest. The north and northwest will probably see the lion's share of the rain and any strong winds, whilst the south and southeast will probably see the driest and sunniest weather. Temperatures are likely to be above average overall. There is a chance that late season hot spells or heatwaves develop, especially in the south.

Updated: 14:00 (UTC+1) on Mon 17 Aug 2026

Portstewart (County Londonderry) weather

Find a forecast

Forecast days

Tue 18 Aug

Tue 18 Aug

Wed 19 Aug

Wed 19 Aug

Thu 20 Aug

Thu 20 Aug

Fri 21 Aug

Fri 21 Aug

Sat 22 Aug

Sat 22 Aug

Sun 23 Aug

Sun 23 Aug

Mon 24 Aug

Mon 24 Aug

7 day forecast for Portstewart

Tooltip header

UK video forecast

Northern Ireland weather forecast

Headline:

This Evening and Tonight:

Tuesday:

Outlook for Wednesday to Friday:

UK long range weather forecast

Nearest forecasts

Portstewart (County Londonderry) weather

Find a forecast

Forecast days

Tue 18 Aug

Tue 18 Aug

Wed 19 Aug

Wed 19 Aug

Thu 20 Aug

Thu 20 Aug

Fri 21 Aug

Fri 21 Aug

Sat 22 Aug

Sat 22 Aug

Sun 23 Aug

Sun 23 Aug

Mon 24 Aug

Mon 24 Aug

7 day forecast for Portstewart

UK video forecast

Northern Ireland weather forecast

Monday 17 Aug - Friday 21 Aug

Headline:

This Evening and Tonight:

Tuesday:

Outlook for Wednesday to Friday:

UK long range weather forecast

Saturday 22 Aug - Monday 31 Aug

Tuesday 1 Sep - Tuesday 15 Sep

Nearest forecasts