Mountain Ash (Rhondda Cynon Taf) weather
Find a forecast
Forecast days
-
Maximum daytime temperature: 17° Celsius; Minimum nighttime temperature: 15° Celsius;
Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 15 degrees Celsius; -
Maximum daytime temperature: 19° Celsius; Minimum nighttime temperature: 12° Celsius;
Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius; -
Maximum daytime temperature: 19° Celsius; Minimum nighttime temperature: 13° Celsius;
Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 13 degrees Celsius; -
Maximum daytime temperature: 21° Celsius; Minimum nighttime temperature: 12° Celsius;
Maximum daytime temperature: 21 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius;
-
Maximum daytime temperature: 22° Celsius; Minimum nighttime temperature: 12° Celsius;
Maximum daytime temperature: 22 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius;
-
Maximum daytime temperature: 19° Celsius; Minimum nighttime temperature: 8° Celsius;
Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 8 degrees Celsius;
-
Maximum daytime temperature: 18° Celsius; Minimum nighttime temperature: 13° Celsius;
Maximum daytime temperature: 18 degrees Celsius; Minimum nighttime temperature: 13 degrees Celsius;
Light rain.
Sunrise:
Sunset:
M UV
L Pollution
No pollen data.
7 day forecast for Mountain Ash
Today (18 September 2026)
| Time |
12:00
|
13:00
|
14:00
|
15:00
|
16:00
|
17:00
|
18:00
|
19:00
|
20:00
|
21:00
|
22:00
|
23:00
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |  |
|
|
|
|
|
|
|
|
|
 |
|
| Chance of precipitation |
90%
|
90%
|
70%
|
70%
|
80%
|
90%
|
90%
|
80%
|
80%
|
80%
|
80%
|
90%
|
| Temperature |
16°
|
16°
|
16°
|
16°
|
16°
|
16°
|
16°
|
16°
|
16°
|
16°
|
17°
|
17°
|
| Feels like temperature (°C) |
15°
|
15°
|
14°
|
15°
|
15°
|
15°
|
14°
|
14°
|
15°
|
15°
|
16°
|
15°
|
| Wind direction and speed |
WSW
9
|
WSW
10
|
WSW
11
|
WSW
10
|
WSW
10
|
WSW
9
|
WSW
10
|
WSW
11
|
WSW
11
|
WSW
10
|
WSW
10
|
WSW
10
|
| Wind gust (mph) |
30
|
31
|
32
|
32
|
31
|
32
|
31
|
31
|
31
|
31
|
32
|
31
|
| Visibility |
G
|
G
|
G
|
G
|
M
|
M
|
M
|
M
|
P
|
P
|
P
|
P
|
| Humidity |
72%
|
80%
|
81%
|
77%
|
83%
|
87%
|
91%
|
93%
|
95%
|
96%
|
96%
|
94%
|
| UV | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | - | - | - | - |
Saturday (19 September 2026)
| Time |
00:00
|
01:00
|
02:00
|
03:00
|
04:00
|
05:00
|
06:00
|
07:00
|
08:00
|
09:00
|
10:00
|
11:00
|
12:00
|
13:00
|
14:00
|
15:00
|
16:00
|
17:00
|
18:00
|
19:00
|
20:00
|
21:00
|
22:00
|
23:00
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols | |
 |
|
|
|
 |
|
|
|
|
 |
|
|
 |
|
|
|
|
|
 |
 |
|
|
|
| Chance of precipitation |
60%
|
30%
|
40%
|
60%
|
80%
|
90%
|
≥95%
|
≥95%
|
≥95%
|
90%
|
90%
|
70%
|
60%
|
40%
|
30%
|
20%
|
20%
|
30%
|
30%
|
20%
|
30%
|
30%
|
30%
|
20%
|
| Temperature (°C) |
16°
|
16°
|
16°
|
16°
|
17°
|
16°
|
17°
|
17°
|
17°
|
17°
|
18°
|
18°
|
18°
|
19°
|
19°
|
19°
|
19°
|
18°
|
18°
|
17°
|
17°
|
16°
|
16°
|
15°
|
| Feels like temperature (°C) |
15°
|
15°
|
15°
|
15°
|
16°
|
16°
|
16°
|
16°
|
16°
|
16°
|
17°
|
17°
|
17°
|
18°
|
18°
|
18°
|
18°
|
17°
|
17°
|
17°
|
16°
|
16°
|
15°
|
15°
|
| Wind direction and speed (mph) |
W
9
|
WSW
9
|
WSW
9
|
WSW
9
|
WSW
9
|
WSW
9
|
WSW
10
|
WSW
10
|
WSW
10
|
WSW
10
|
WSW
10
|
WSW
10
|
WSW
10
|
WSW
9
|
W
10
|
W
10
|
W
9
|
W
9
|
W
8
|
W
6
|
W
6
|
W
6
|
W
6
|
W
6
|
| Wind gust (mph) |
30
|
30
|
30
|
30
|
30
|
31
|
32
|
32
|
32
|
32
|
32
|
33
|
33
|
33
|
31
|
30
|
28
|
25
|
23
|
21
|
21
|
20
|
21
|
21
|
| Visibility (description) |
M
|
M
|
M
|
M
|
M
|
P
|
P
|
P
|
P
|
P
|
P
|
P
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
G
|
G
|
| Humidity |
93%
|
92%
|
91%
|
90%
|
91%
|
95%
|
96%
|
97%
|
97%
|
97%
|
95%
|
93%
|
89%
|
83%
|
77%
|
75%
|
74%
|
75%
|
78%
|
82%
|
86%
|
87%
|
87%
|
88%
|
| UV | - | - | - | - | - | - | 1 | 1 | 1 | 1 | 1 | 1 | 3 | 3 | 3 | 2 | 2 | 1 | 1 | 1 | - | - | - | - |
Sunday (20 September 2026)
| Time |
00:00
|
01:00
|
02:00
|
03:00
|
04:00
|
05:00
|
06:00
|
07:00
|
08:00
|
09:00
|
10:00
|
11:00
|
12:00
|
13:00
|
14:00
|
15:00
|
16:00
|
17:00
|
18:00
|
19:00
|
20:00
|
21:00
|
22:00
|
23:00
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Chance of precipitation |
20%
|
20%
|
20%
|
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
<5%
|
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
20%
|
20%
|
20%
|
| Temperature (°C) |
15°
|
15°
|
15°
|
15°
|
14°
|
14°
|
13°
|
13°
|
14°
|
15°
|
16°
|
17°
|
17°
|
18°
|
18°
|
19°
|
19°
|
18°
|
18°
|
16°
|
16°
|
15°
|
14°
|
14°
|
| Feels like temperature (°C) |
15°
|
14°
|
14°
|
14°
|
14°
|
13°
|
13°
|
12°
|
13°
|
15°
|
15°
|
16°
|
17°
|
18°
|
18°
|
18°
|
18°
|
18°
|
18°
|
16°
|
16°
|
16°
|
14°
|
14°
|
| Wind direction and speed (mph) |
W
6
|
W
6
|
W
6
|
WNW
5
|
WNW
5
|
WNW
5
|
WNW
5
|
WNW
5
|
WNW
4
|
WNW
4
|
WNW
5
|
WNW
5
|
WNW
5
|
WNW
5
|
WNW
5
|
W
5
|
WNW
5
|
W
5
|
W
3
|
W
3
|
W
2
|
W
2
|
WNW
2
|
NW
2
|
| Wind gust (mph) |
21
|
20
|
19
|
18
|
16
|
15
|
14
|
13
|
14
|
15
|
16
|
16
|
17
|
17
|
17
|
17
|
16
|
15
|
13
|
12
|
9
|
9
|
9
|
9
|
| Visibility (description) |
G
|
M
|
G
|
M
|
G
|
G
|
G
|
M
|
G
|
G
|
G
|
G
|
G
|
G
|
VG
|
VG
|
G
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
| Humidity |
90%
|
90%
|
91%
|
91%
|
90%
|
88%
|
88%
|
87%
|
86%
|
80%
|
75%
|
67%
|
66%
|
63%
|
61%
|
61%
|
61%
|
64%
|
71%
|
77%
|
84%
|
87%
|
88%
|
90%
|
| UV | - | - | - | - | - | - | 1 | 1 | 1 | 1 | 2 | 3 | 4 | 3 | 3 | 2 | 1 | 1 | 1 | 1 | - | - | - | - |
Monday (21 September 2026)
| Time |
00:00
|
01:00
|
02:00
|
03:00
|
04:00
|
05:00
|
06:00
|
07:00
|
08:00
|
09:00
|
10:00
|
11:00
|
12:00
|
13:00
|
14:00
|
15:00
|
16:00
|
17:00
|
18:00
|
19:00
|
20:00
|
21:00
|
22:00
|
23:00
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols | |
|
|
|
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Chance of precipitation |
20%
|
20%
|
20%
|
20%
|
20%
|
30%
|
30%
|
30%
|
30%
|
20%
|
20%
|
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
10%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
| Temperature (°C) |
14°
|
14°
|
14°
|
14°
|
14°
|
14°
|
14°
|
14°
|
16°
|
17°
|
18°
|
19°
|
20°
|
20°
|
21°
|
21°
|
21°
|
21°
|
20°
|
19°
|
17°
|
16°
|
16°
|
15°
|
| Feels like temperature (°C) |
14°
|
14°
|
14°
|
14°
|
14°
|
14°
|
14°
|
14°
|
16°
|
17°
|
19°
|
20°
|
20°
|
21°
|
22°
|
22°
|
23°
|
22°
|
21°
|
20°
|
18°
|
17°
|
16°
|
16°
|
| Wind direction and speed (mph) |
WNW
2
|
WNW
3
|
WNW
3
|
WNW
3
|
WNW
2
|
W
3
|
W
3
|
W
3
|
WNW
2
|
W
2
|
W
2
|
W
3
|
W
3
|
W
3
|
W
3
|
W
3
|
W
3
|
W
3
|
W
3
|
WNW
2
|
WNW
2
|
NW
2
|
NW
2
|
NW
2
|
| Wind gust (mph) |
9
|
9
|
9
|
11
|
9
|
11
|
12
|
12
|
9
|
9
|
9
|
13
|
13
|
13
|
13
|
13
|
13
|
13
|
11
|
9
|
9
|
8
|
8
|
7
|
| Visibility (description) |
M
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
M
|
G
|
G
|
G
|
G
|
G
|
G
|
G
|
G
|
M
|
M
|
M
|
M
|
| Humidity |
92%
|
92%
|
93%
|
93%
|
93%
|
94%
|
96%
|
96%
|
95%
|
91%
|
87%
|
84%
|
82%
|
80%
|
78%
|
77%
|
77%
|
78%
|
81%
|
87%
|
92%
|
94%
|
96%
|
96%
|
| UV | - | - | - | - | - | - | 1 | 1 | 1 | 1 | 2 | 3 | 3 | 3 | 3 | 2 | 1 | 1 | 1 | 1 | - | - | - | - |
Tuesday (22 September 2026)
| Time |
00:00
|
01:00
|
02:00
|
03:00
|
04:00
|
05:00
|
06:00
|
07:00
|
08:00
|
09:00
|
10:00
|
11:00
|
12:00
|
13:00
|
14:00
|
15:00
|
16:00
|
17:00
|
18:00
|
19:00
|
20:00
|
21:00
|
22:00
|
23:00
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
|
|
 |
|
|
|
|
| Chance of precipitation |
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
10%
|
10%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
<5%
|
| Temperature (°C) |
15°
|
15°
|
14°
|
14°
|
13°
|
13°
|
13°
|
13°
|
15°
|
16°
|
18°
|
19°
|
20°
|
21°
|
22°
|
22°
|
22°
|
22°
|
21°
|
18°
|
17°
|
16°
|
16°
|
15°
|
| Feels like temperature (°C) |
15°
|
15°
|
14°
|
14°
|
14°
|
14°
|
13°
|
13°
|
16°
|
17°
|
19°
|
21°
|
21°
|
22°
|
22°
|
22°
|
23°
|
22°
|
22°
|
19°
|
17°
|
17°
|
16°
|
16°
|
| Wind direction and speed (mph) |
NW
2
|
NW
2
|
NW
2
|
NW
2
|
NNW
2
|
NNW
2
|
E
2
|
SE
2
|
SE
2
|
SSE
2
|
SSE
2
|
S
2
|
S
3
|
SSW
3
|
SSW
4
|
SSW
4
|
SSW
3
|
SW
3
|
SW
3
|
WSW
2
|
W
2
|
W
2
|
W
2
|
W
2
|
| Wind gust (mph) |
6
|
7
|
7
|
7
|
7
|
8
|
8
|
8
|
9
|
8
|
9
|
9
|
12
|
13
|
13
|
13
|
12
|
10
|
9
|
9
|
9
|
9
|
9
|
9
|
| Visibility (description) |
M
|
M
|
M
|
M
|
P
|
M
|
P
|
P
|
M
|
M
|
G
|
G
|
G
|
G
|
VG
|
VG
|
VG
|
VG
|
G
|
G
|
G
|
G
|
G
|
G
|
| Humidity |
97%
|
97%
|
97%
|
97%
|
97%
|
97%
|
97%
|
97%
|
96%
|
91%
|
85%
|
81%
|
73%
|
71%
|
67%
|
66%
|
66%
|
67%
|
74%
|
84%
|
86%
|
89%
|
91%
|
92%
|
| UV | - | - | - | - | - | - | - | 1 | 1 | 1 | 2 | 3 | 4 | 4 | 3 | 2 | 1 | 1 | 1 | 1 | - | - | - | - |
Wednesday (23 September 2026)
| Time |
00:00
|
01:00
|
04:00
|
07:00
|
10:00
|
13:00
|
16:00
|
19:00
|
22:00
|
|---|---|---|---|---|---|---|---|---|---|
| Weather symbols | |
|
|
|
|
|
|
|
|
| Chance of precipitation |
<5%
|
10%
|
20%
|
10%
|
10%
|
10%
|
10%
|
<5%
|
<5%
|
| Temperature (°C) |
15°
|
15°
|
13°
|
13°
|
16°
|
19°
|
19°
|
16°
|
12°
|
| Feels like temperature (°C) |
15°
|
15°
|
13°
|
12°
|
15°
|
18°
|
19°
|
16°
|
12°
|
| Wind direction and speed (mph) |
W
2
|
W
2
|
WNW
3
|
NNW
4
|
N
5
|
N
6
|
N
4
|
NNE
3
|
NE
2
|
| Wind gust (mph) |
9
|
9
|
12
|
16
|
17
|
15
|
15
|
10
|
8
|
| Visibility (description) |
G
|
M
|
P
|
P
|
G
|
VG
|
G
|
VG
|
G
|
| Humidity |
93%
|
94%
|
96%
|
95%
|
81%
|
64%
|
59%
|
72%
|
84%
|
| UV | - | - | - | 1 | 2 | 4 | 1 | 1 | - |
Thursday (24 September 2026)
| Time |
01:00
|
04:00
|
07:00
|
10:00
|
13:00
|
16:00
|
19:00
|
22:00
|
|---|---|---|---|---|---|---|---|---|
| Weather symbols | |
|
|
|
|
|
|
|
| Chance of precipitation |
<5%
|
<5%
|
<5%
|
10%
|
10%
|
10%
|
20%
|
20%
|
| Temperature (°C) |
11°
|
9°
|
9°
|
15°
|
17°
|
18°
|
17°
|
16°
|
| Feels like temperature (°C) |
10°
|
8°
|
9°
|
15°
|
16°
|
17°
|
16°
|
15°
|
| Wind direction and speed (mph) |
NNE
2
|
NE
2
|
SSW
2
|
S
5
|
SSW
8
|
SW
8
|
SW
6
|
SW
6
|
| Wind gust (mph) |
6
|
6
|
9
|
19
|
22
|
21
|
17
|
16
|
| Visibility (description) |
M
|
M
|
P
|
G
|
G
|
G
|
G
|
G
|
| Humidity |
87%
|
91%
|
93%
|
82%
|
78%
|
76%
|
84%
|
92%
|
| UV | - | - | 1 | 2 | 3 | 1 | 1 | - |
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Wales weather forecast
Headline:
A bight start, but wet and windy weather spreading east.
Today:
Dry and bright at first for all, but turning increasingly cloudy through the morning. Outbreaks of rain then spread east during the afternoon, turning heavy for a time. Becoming rather windy with gales along northwestern coasts. Maximum temperature 17 °C.
Tonight:
A rather cloudy night follows with the rain easing and turning dry for a time. Remaining rather windy, keeping the temperatures from falling away. Minimum temperature 13 °C.
Saturday:
A rather cloudy day for all on Saturday with a little patchy rain at times. Winds easing and turning drier towards the evening. Maximum temperature 19 °C.
Outlook for Sunday to Tuesday:
Dry but rather cloudy on Sunday with some overnight rain. Rather cloudy on Monday and Tuesday with some sunny spells and lighter winds and turning a little warmer.
Updated: