Portstewart weather live forecast

Today's maximum temperature in Portstewart is expected to be 18°C. Select a day from the live weather forecast for Portstewart, Northern Ireland, UK for more weather parameters.

Friday
15th Aug
18

11

4

4
Saturday
16th Aug
23

14

9

5
Sunday
17th Aug
25

14

7

5
Monday
18th Aug
27

15

9

4
Tuesday
19th Aug
26

15

6

4

5-day weather forecast updated at 04:04 on Friday 15th August 2025 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 Friday 15th August 2025

Expect broken clouds in Portstewart, Northern Ireland with a maximum temperature of 18°C, maximum UV of 4 (Moderate) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the north.

18
°C maximum temperature
11
°C minimum temperature
broken clouds
4
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
16
kph wind from N

Portstewart weather for Saturday 16th August 2025

Expect broken clouds in Portstewart, Northern Ireland with a maximum temperature of 23°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the north.

23
°C maximum temperature
14
°C minimum temperature
broken clouds
9
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
23
°C wind chill
16
kph wind from N

Portstewart weather for Sunday 17th August 2025

Expect broken clouds in Portstewart, Northern Ireland with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 21 kph from the south-east.

25
°C maximum temperature
14
°C minimum temperature
broken clouds
7
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
21
kph wind from SE

Portstewart weather for Monday 18th August 2025

Expect scattered clouds in Portstewart, Northern Ireland with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 4 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-east.

27
°C maximum temperature
15
°C minimum temperature
scattered clouds
9
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
L
low heat & humidity
13
kph wind from SE

Portstewart weather for Tuesday 19th August 2025

Expect broken clouds in Portstewart, Northern Ireland with a maximum temperature of 26°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the east.