Portstewart weather live forecast

Today's maximum temperature in Portstewart is expected to be 15°C. Select a day from the live weather forecast for Portstewart, Northern Ireland, UK for more weather parameters.

Tuesday
16th Sep
15

11

5

2
Wednesday
17th Sep
17

11

0

3
Thursday
18th Sep
17

12

2

2
Friday
19th Sep
16

11

1

2
Saturday
20th Sep
13

9

6

3

5-day weather forecast updated at 04:04 on Tuesday 16th September 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 Tuesday 16th September 2025

Expect sunshine and showers in Portstewart, Northern Ireland with a maximum temperature of 15°C, maximum UV of 2 (Low) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 42% chance of some rain and a fresh breeze of 30 kph from the west.

15
°C maximum temperature
11
°C minimum temperature
sunshine and showers
5
hours of sunshine
2
UV index (Low)
42
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
30
kph wind from W

Portstewart weather for Wednesday 17th September 2025

Expect mostly cloudy with rain in Portstewart, Northern Ireland with a maximum temperature of 17°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 24% chance of some rain and a fresh breeze of 37 kph from the south-west.

17
°C maximum temperature
11
°C minimum temperature
mostly cloudy with rain
0
hours of sunshine
3
UV index (Moderate)
24
% chance of some rain
<10
mm of rainfall expected
17
°C wind chill
37
kph wind from SW

Portstewart weather for Thursday 18th September 2025

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 17°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 33% chance of some rain and a fresh breeze of 33 kph from the south-west.

17
°C maximum temperature
12
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
2
UV index (Low)
33
% chance of some rain
<2
mm of rainfall expected
17
°C wind chill
33
kph wind from SW

Portstewart weather for Friday 19th September 2025

Expect cloudy with some rain in Portstewart, Northern Ireland with a maximum temperature of 16°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 10-20 mm of rainfall expected with 39% chance of some rain and a gentle breeze of 14 kph from the south-west.

16
°C maximum temperature
11
°C minimum temperature
cloudy with some rain
1
hour of sunshine
2
UV index (Low)
39
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
14
kph wind from SW

Portstewart weather for Saturday 20th September 2025

Expect sunshine and showers in Portstewart, Northern Ireland with a maximum temperature of 13°C, maximum UV of 3 (Moderate) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 69% chance of some rain and a light breeze of 12 kph from the north-east.