Portstewart weather live forecast

Today's maximum temperature in Portstewart is expected to be 16°C. Select a day from the live weather forecast for Portstewart, Northern Ireland, UK for more weather parameters.

Sunday
16th Aug
16

13

0

2
Monday
17th Aug
18

14

0

1
Tuesday
18th Aug
18

13

2

3
Wednesday
19th Aug
17

12

2

3
Thursday
20th Aug
16

11

3

5

5-day weather forecast updated at 04:03 on Sunday 16th August 2026 GMT

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The 5-day weather forecast for Northern Ireland (Portstewart) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Portstewart weather forecast by day

Below are the detailed weather forecasts for Portstewart for the next 5 days.

Portstewart weather for Sunday 16th August 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 16°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 2-5 mm of rainfall expected with 48% chance of some rain and a gentle breeze of 16 kph from the south.

16
°C maximum temperature
13
°C minimum temperature
mostly cloudy with light rain
0
hours of sunshine
2
UV index (Low)
48
% chance of some rain
<5
mm of rainfall expected
16
°C wind chill
16
kph wind from S

Portstewart weather for Monday 17th August 2026

Expect cloudy with some rain in Portstewart, Northern Ireland with a maximum temperature of 18°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 98% chance of some rain and a moderate breeze of 22 kph from the south-west.

18
°C maximum temperature
14
°C minimum temperature
cloudy with some rain
0
hours of sunshine
1
UV index (Low)
98
% chance of some rain
<20
mm of rainfall expected
18
°C wind chill
22
kph wind from SW

Portstewart weather for Tuesday 18th August 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 18°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 44% chance of some rain and a fresh breeze of 32 kph from the west.

18
°C maximum temperature
13
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
3
UV index (Moderate)
44
% chance of some rain
<2
mm of rainfall expected
18
°C wind chill
32
kph wind from W

Portstewart weather for Wednesday 19th August 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 17°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 2-5 mm of rainfall expected with 92% chance of some rain and a moderate breeze of 24 kph from the south-west.

17
°C maximum temperature
12
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
3
UV index (Moderate)
92
% chance of some rain
<5
mm of rainfall expected
17
°C wind chill
24
kph wind from SW

Portstewart weather for Thursday 20th August 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 16°C, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 57% chance of some rain and a moderate breeze of 28 kph from the north.