Portstewart weather live forecast

Today's maximum temperature in Portstewart is expected to be 14°C. Select a day from the live weather forecast for Portstewart, Northern Ireland, UK for more weather parameters.

Monday
18th May
14

6

2

4
Tuesday
19th May
16

10

0

3
Wednesday
20th May
17

10

6

5
Thursday
21st May
19

11

1

4
Friday
22nd May
20

12

0

4

5-day weather forecast updated at 04:03 on Monday 18th May 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 Monday 18th May 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 14°C, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 79% chance of some rain and a moderate breeze of 24 kph from the south-east.

14
°C maximum temperature
6
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
4
UV index (Moderate)
79
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
24
kph wind from SE

Portstewart weather for Tuesday 19th May 2026

Expect mostly cloudy with rain in Portstewart, Northern Ireland with a maximum temperature of 16°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 89% chance of some rain and a fresh breeze of 29 kph from the south-east.

16
°C maximum temperature
10
°C minimum temperature
mostly cloudy with rain
0
hours of sunshine
3
UV index (Moderate)
89
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
29
kph wind from SE

Portstewart weather for Wednesday 20th May 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 17°C, maximum UV of 5 (Moderate) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 43% chance of some rain and a moderate breeze of 27 kph from the west.

17
°C maximum temperature
10
°C minimum temperature
mostly cloudy with light rain
6
hours of sunshine
5
UV index (Moderate)
43
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
27
kph wind from W

Portstewart weather for Thursday 21st May 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 19°C, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 56% chance of some rain and a moderate breeze of 22 kph from the south.

19
°C maximum temperature
11
°C minimum temperature
mostly cloudy with light rain
1
hour of sunshine
4
UV index (Moderate)
56
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
22
kph wind from S

Portstewart weather for Friday 22nd May 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 20°C, maximum UV of 4 (Moderate) and no hours of bright sunshine. There are 2-5 mm of rainfall expected with 58% chance of some rain and a moderate breeze of 22 kph from the south.