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.

Friday
4th Sep
17

13

7

3
Saturday
5th Sep
18

12

4

2
Sunday
6th Sep
22

15

3

2
Monday
7th Sep
18

11

0

3
Tuesday
8th Sep
15

10

4

3

5-day weather forecast updated at 04:03 on Friday 4th September 2026 GMT

More about Portstewart

Portstewart by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Northern Ireland

Fred Olsen: Top cruise offers for 2026/2027

Sale

Explore latest offers on Fred Olsen Cruises in 2026/2027
Find last minute deals or early bird discounts
Filter offers by price, destination, ship & departure point

Go to Fred Olsen deal >>

View all Fred Olsen offers

Cruise deal finder

Destination

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 4th September 2026

Expect sunshine and showers in Portstewart, Northern Ireland with a maximum temperature of 17°C, maximum UV of 3 (Moderate) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 34% chance of some rain and a fresh breeze of 35 kph from the west.

17
°C maximum temperature
13
°C minimum temperature
sunshine and showers
7
hours of sunshine
3
UV index (Moderate)
34
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
35
kph wind from W

Portstewart weather for Saturday 5th September 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 18°C, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 18% chance of some rain and a moderate breeze of 24 kph from the west.

18
°C maximum temperature
12
°C minimum temperature
mostly cloudy with light rain
4
hours of sunshine
2
UV index (Low)
18
% chance of some rain
<2
mm of rainfall expected
18
°C wind chill
24
kph wind from W

Portstewart weather for Sunday 6th September 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 22°C, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 41% chance of some rain and a fresh breeze of 32 kph from the south.

22
°C maximum temperature
15
°C minimum temperature
mostly cloudy with light rain
3
hours of sunshine
2
UV index (Low)
41
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
32
kph wind from S

Portstewart weather for Monday 7th September 2026

Expect overcast with light rain in Portstewart, Northern Ireland with a maximum temperature of 18°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 2-5 mm of rainfall expected with 63% chance of some rain and a moderate breeze of 20 kph from the south-west.

18
°C maximum temperature
11
°C minimum temperature
overcast with light rain
0
hours of sunshine
3
UV index (Moderate)
63
% chance of some rain
<5
mm of rainfall expected
18
°C wind chill
20
kph wind from SW

Portstewart weather for Tuesday 8th September 2026

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 15°C, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 2-5 mm of rainfall expected with 84% chance of some rain and a fresh breeze of 35 kph from the north-west.