Portstewart weather live forecast

Today's maximum temperature in Portstewart is expected to be 17°C. Select a day from the live weather forecast for Portstewart, Northern Ireland, UK for more weather parameters.

Saturday
15th Aug
17

13

3

2
Sunday
16th Aug
17

13

0

2
Monday
17th Aug
17

15

0

1
Tuesday
18th Aug
17

13

2

4
Wednesday
19th Aug
17

12

2

4

5-day weather forecast updated at 04:03 on Saturday 15th 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 Saturday 15th August 2026

Expect broken clouds in Portstewart, Northern Ireland with a maximum temperature of 17°C, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the north-west.

17
°C maximum temperature
13
°C minimum temperature
broken clouds
3
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
17
°C wind chill
17
kph wind from NW

Portstewart weather for Sunday 16th August 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 17°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 2-5 mm of rainfall expected with 43% chance of some rain and a gentle breeze of 14 kph from the south.

17
°C maximum temperature
13
°C minimum temperature
mostly cloudy with light rain
0
hours of sunshine
2
UV index (Low)
43
% chance of some rain
<5
mm of rainfall expected
17
°C wind chill
14
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 17°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 91% chance of some rain and a gentle breeze of 19 kph from the south-west.

17
°C maximum temperature
15
°C minimum temperature
cloudy with some rain
0
hours of sunshine
1
UV index (Low)
91
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
19
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 17°C, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 57% chance of some rain and a moderate breeze of 25 kph from the west.

17
°C maximum temperature
13
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
4
UV index (Moderate)
57
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
25
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 4 (Moderate) and 2 hours of bright sunshine. There are 2-5 mm of rainfall expected with 84% chance of some rain and a moderate breeze of 26 kph from the west.