As of 00:01 BST

Weather in Portstewart

+17°

Portstewart, Sunday, 9 August, 00:01

Light rain. Feels like 17°C. High 17°C, low 13°C.

Pressure1011 mb

Wind9 mph S

Humidity74%

Visibility6.2 mi

Dew point12°C

Detailed hourly forecast

Mon, 10+12 ° /16 °

+16 °

Portstewart, Monday, 10 August

Partly cloudy. High 16°C, low 12°C.

Pressure1022 mb

Wind9 mph NW

Humidity76%

Visibility6.2 mi

Dew point11°C

Tue, 11+12 ° /20 °

+20 °

Portstewart, Tuesday, 11 August

Overcast. High 20°C, low 12°C.

Pressure1021 mb

Wind12 mph SE

Humidity62%

Visibility6.2 mi

Dew point11°C

Wed, 12+15 ° /21 °

1.6

+21 °

Portstewart, Wednesday, 12 August

Light rain. High 21°C, low 15°C.

Pressure1019 mb

Wind11 mph S

Humidity76%

Visibility6.2 mi

Dew point15°C

Thu, 13+16 ° /20 °

5.2

+20 °

Portstewart, Thursday, 13 August

Light rain. High 20°C, low 16°C.

Pressure1018 mb

Wind8 mph S

Humidity85%

Visibility—

Dew point17°C

Fri, 14+14 ° /17 °

1.5

+17 °

Portstewart, Friday, 14 August

Light rain. High 17°C, low 14°C.

Pressure1018 mb

Wind11 mph NW

Humidity96%

Visibility—

Dew point16°C

Sat, 15+13 ° /15 °

+15 °

Portstewart, Saturday, 15 August

Clear sky. High 15°C, low 13°C.

Pressure1020 mb

Wind13 mph NW

Humidity83%

Visibility—

Dew point12°C

Sun, 16+12 ° /15 °

+15 °

Portstewart, Sunday, 16 August

Overcast. High 15°C, low 12°C.

Pressure1019 mb

Wind8 mph NW

Humidity74%

Visibility—

Dew point10°C

Mon, 17+14 ° /16 °

3.7

+16 °

Portstewart, Monday, 17 August

Light rain. High 16°C, low 14°C.

Pressure1007 mb

Wind19 mph W

Humidity96%

Visibility—

Dew point15°C

Tue, 18+13 ° /16 °

1.3

+16 °

Portstewart, Tuesday, 18 August

Light rain. High 16°C, low 13°C.

Pressure1012 mb

Wind20 mph W

Humidity72%

Visibility—

Dew point10°C

Wed, 19+13 ° /16 °

2.5

+16 °

Portstewart, Wednesday, 19 August

Light rain. High 16°C, low 13°C.

Pressure1011 mb

Wind20 mph W

Humidity74%

Visibility—

Dew point11°C

Thu, 20+13 ° /15 °

3.6

+15 °

Portstewart, Thursday, 20 August

Light rain. High 15°C, low 13°C.

Pressure1014 mb

Wind17 mph W

Humidity78%

Visibility—

Dew point11°C

Fri, 21+12 ° /14 °

0.6

+14 °

Portstewart, Friday, 21 August

Light rain. High 14°C, low 12°C.

Pressure1018 mb

Wind13 mph N

Humidity74%

Visibility—

Dew point9°C

Sat, 22+13 ° /15 °

+15 °

Portstewart, Saturday, 22 August

Mainly clear. High 15°C, low 13°C.

Pressure1023 mb

Wind8 mph N

Humidity81%

Visibility—

Dew point12°C

Sun, 23+12 ° /14 °

2.1

+14 °

Portstewart, Sunday, 23 August

Light rain. High 14°C, low 12°C.

Pressure1016 mb

Wind17 mph S

Humidity85%

Visibility—

Dew point11°C

Mon, 24+13 ° /14 °

0.4

+14 °

Portstewart, Monday, 24 August

Light rain. High 14°C, low 13°C.

Pressure1015 mb

Wind12 mph SW

Humidity88%

Visibility—

Dew point11°C

Questions about the month ahead

How accurate is a month-long forecast?

The first 16 days come from weather models — highly reliable for the first 3–5 days, gradually less so after that. Days 17 to 30 for Portstewart are built from climate averages over the last 60 years, so they show typical weather for those dates rather than a specific forecast.

What does "above average" mean?

We compare the forecast with the climate average for exactly the same calendar days, calculated from 60 years of observations. The difference shows how the coming month compares with a typical one.

Where do the 66-year records come from?

These are real historical extremes recorded in Portstewart since 1960: the highest and lowest temperature for each calendar date, with the year it happened.

How often is the 30-day forecast updated?

The forecast portion refreshes every hour. The climate portion is based on long-term data and stays stable.