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    Unsettled again - Humid air brings thundery outbreaks

15:09
26 August 2026

Unsettled again
Humid air brings thundery outbreaks

Temperature map for Wednesday August 26th showing 26°C near London, 24°C in Cardiff, 23°C in Liverpool, 20°C in Dublin, and 18-19°C across Scotland.
Conditions warm and turn humid as thunderstorms develop.

Low pressure becomes increasingly influential this week after a settled start, with heavy rain and another outbreak of thunderstorms expected from Wednesday.

Conditions begin to change already by Tuesday due to an area of low pressure over the Bay of Biscay but at first it is mostly dry with sunny spells despite some patchy light rain in northern England and parts of Scotland.

Wednesday marks the turning point if the week. Things become increasingly warm and humid across Ireland, Wales, and southern to central England, resulting in scattered, thundery showers, some heavy which could lead to flash floods. Where thunderstorms develop, up to 60 mm of rainfall could fall in a few hours.

Those conditions remain in place on Thursday with further heavy downpours and thunderstorms across southwestern and southern England early in the day, though there is still some uncertainty on exactly where they will reach at this point.

Into the bank holiday weekend conditions remain stable in its instability. Friday sees a cooler day with low-pressure likely to remain dominant over the weekend into the coming week.

Have plans for the long weekend? Stay up to date with what's on the way with the WeatherRadar.

London

We
19
26
Th
19
25
Fr
16
22
Sa
17
19
Su
17
22
Mo
16
21
Tu
15
23
We
15
23
Th
16
24
Fr
17
25
Sa
16
23
Su
13
21
Mo
15
23
Tu
13
22
Max (°C)
Min (°C)
moreless

Manchester

We
17
24
Th
17
20
Fr
15
20
Sa
16
18
Su
15
20
Mo
13
17
Tu
12
18
We
11
19
Th
14
20
Fr
14
19
Sa
11
18
Su
10
17
Mo
12
19
Tu
11
18
Max (°C)
Min (°C)
moreless

Dublin

We
16
20
Th
15
19
Fr
16
22
Sa
15
18
Su
14
19
Mo
13
18
Tu
11
19
We
10
19
Th
15
20
Fr
12
18
Sa
9
17
Su
8
17
Mo
12
20
Tu
10
18
Max (°C)
Min (°C)
moreless

Edinburgh

We
14
20
Th
15
19
Fr
15
19
Sa
15
18
Su
11
19
Mo
13
17
Tu
10
18
We
12
19
Th
13
19
Fr
13
18
Sa
10
17
Su
9
16
Mo
11
17
Tu
10
18
Max (°C)
Min (°C)
moreless

Cardiff

We
16
26
Th
18
22
Fr
15
20
Sa
17
20
Su
16
21
Mo
15
19
Tu
13
20
We
14
22
Th
16
21
Fr
16
21
Sa
14
19
Su
12
20
Mo
14
21
Tu
12
19
Max (°C)
Min (°C)
moreless

Weather & Radar editorial team
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