Portstewart weather live forecast

Today's maximum temperature in Portstewart is expected to be 57°F. Select a day from the live weather forecast for Portstewart, Northern Ireland, UK for more weather parameters.

Thursday
11th Sep
57

50

3

2
Friday
12th Sep
57

50

4

3
Saturday
13th Sep
57

48

3

3
Sunday
14th Sep
61

46

1

2
Monday
15th Sep
57

52

2

2

5-day weather forecast updated at 04:04 on Thursday 11th September 2025 GMT

More about Portstewart

Portstewart by month

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

Recommended for Northern Ireland

Marriott discount code: Kids stay & eat for free

Discount Code

Kids stay & eat for free at Marriot Bonvoy
Destinations include Europe, Middle East & Africa
Valid for up to 2 adults & 2 kids aged up to 12

Show discount code

******ZJ6

Redeem Marriott discount code >>

View all Marriott offers

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 Thursday 11th September 2025

Expect mostly cloudy with rain in Portstewart, Northern Ireland with a maximum temperature of 57°F, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 5-10 mm of rainfall expected with 67% chance of some rain and a fresh breeze of 20 mph from the south-west.

57
°F maximum temperature
50
°F minimum temperature
mostly cloudy with rain
3
hours of sunshine
2
UV index (Low)
67
% chance of some rain
<10
mm of rainfall expected
57
°F wind chill
20
mph wind from SW

Portstewart weather for Friday 12th September 2025

Expect mostly cloudy with light rain in Portstewart, Northern Ireland with a maximum temperature of 57°F, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 54% chance of some rain and a moderate breeze of 17 mph from the south-west.

57
°F maximum temperature
50
°F minimum temperature
mostly cloudy with light rain
4
hours of sunshine
3
UV index (Moderate)
54
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
17
mph wind from SW

Portstewart weather for Saturday 13th September 2025

Expect mostly cloudy with rain in Portstewart, Northern Ireland with a maximum temperature of 57°F, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 5-10 mm of rainfall expected with 76% chance of some rain and a fresh breeze of 18 mph from the south.

57
°F maximum temperature
48
°F minimum temperature
mostly cloudy with rain
3
hours of sunshine
3
UV index (Moderate)
76
% chance of some rain
<10
mm of rainfall expected
57
°F wind chill
18
mph wind from S

Portstewart weather for Sunday 14th September 2025

Expect mostly cloudy with rain in Portstewart, Northern Ireland with a maximum temperature of 61°F, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 5-10 mm of rainfall expected with 99% chance of some rain and a fresh breeze of 22 mph from the south-east.

61
°F maximum temperature
46
°F minimum temperature
mostly cloudy with rain
1
hour of sunshine
2
UV index (Low)
99
% chance of some rain
<10
mm of rainfall expected
61
°F wind chill
22
mph wind from SE

Portstewart weather for Monday 15th September 2025

Expect mostly cloudy with rain in Portstewart, Northern Ireland with a maximum temperature of 57°F, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 20-30 mm of rainfall expected with 82% chance of some rain and a fresh breeze of 22 mph from the west.