Treharris (Merthyr Tydfil) weather

Forecast days

Light rain changing to cloudy in the afternoon.
Sunrise iconSunrise:
Sunset iconSunset:
H UV
L Pollution

    6 day forecast for Treharris

    Tomorrow (24 June 2025)
    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 Overcast Overcast Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Overcast Sunny intervals Cloudy Cloudy Overcast Overcast Overcast Overcast Overcast Light rain Light rain
    Chance of precipitation
    40%
    20%
    50%
    80%
    90%
    ≥95%
    ≥95%
    ≥95%
    ≥95%
    ≥95%
    90%
    70%
    50%
    20%
    <5%
    <5%
    <5%
    10%
    10%
    20%
    30%
    40%
    50%
    60%
    Temperature
    13°
    14°
    14°
    14°
    14°
    14°
    14°
    14°
    15°
    15°
    15°
    16°
    16°
    17°
    18°
    18°
    18°
    18°
    17°
    17°
    16°
    16°
    15°
    15°
    Feels like temperature (°C)
    12°
    12°
    12°
    12°
    12°
    12°
    12°
    12°
    13°
    13°
    14°
    14°
    14°
    15°
    15°
    16°
    15°
    15°
    15°
    15°
    15°
    14°
    14°
    14°
    Wind direction and speed
    WSW
    8
    W
    9
    WSW
    10
    WSW
    10
    WSW
    10
    WSW
    11
    WSW
    11
    WSW
    12
    WSW
    13
    WSW
    13
    WSW
    13
    WSW
    14
    WSW
    14
    WSW
    14
    WSW
    14
    WSW
    15
    WSW
    15
    WSW
    14
    WSW
    13
    WSW
    12
    WSW
    11
    WSW
    9
    WSW
    8
    WSW
    8
    Wind gust (mph)
    26
    27
    28
    28
    29
    30
    30
    31
    32
    32
    33
    33
    33
    33
    33
    34
    34
    32
    30
    28
    26
    23
    21
    21
    Visibility
    G
    G
    G
    G
    M
    M
    M
    P
    P
    P
    M
    M
    G
    VG
    VG
    E
    E
    VG
    VG
    VG
    VG
    VG
    VG
    G
    Humidity
    85%
    85%
    86%
    88%
    93%
    96%
    97%
    98%
    99%
    99%
    99%
    99%
    98%
    93%
    86%
    80%
    80%
    82%
    84%
    86%
    89%
    92%
    94%
    96%
    UV - - - - 1 1 1 1 1 1 3 3 4 4 6 4 4 2 1 1 1 1 - -
    Wednesday (25 June 2025)
    Time
    00:00
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Light rain Light rain Light rain Light rain Overcast Sunny intervals Cloudy Cloudy Overcast
    Chance of precipitation
    70%
    80%
    70%
    50%
    30%
    10%
    20%
    30%
    50%
    Temperature (°C)
    15°
    15°
    15°
    15°
    17°
    19°
    21°
    19°
    16°
    Feels like temperature (°C)
    14°
    14°
    14°
    15°
    16°
    18°
    21°
    19°
    17°
    Wind direction and speed (mph)
    WSW
    8
    WSW
    8
    WSW
    7
    WSW
    5
    SW
    7
    SW
    7
    SW
    6
    WSW
    6
    WSW
    4
    Wind gust (mph)
    21
    21
    18
    17
    17
    16
    17
    15
    7
    Visibility (description)
    G
    M
    M
    M
    VG
    VG
    E
    VG
    VG
    Humidity
    97%
    98%
    99%
    99%
    98%
    84%
    70%
    78%
    91%
    UV - - 1 1 2 5 4 1 -
    Thursday (26 June 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Overcast Light rain Light shower day Sunny intervals Sunny intervals Sunny intervals Sunny intervals Partly cloudy night
    Chance of precipitation
    50%
    80%
    80%
    40%
    10%
    10%
    20%
    20%
    Temperature (°C)
    15°
    15°
    15°
    17°
    18°
    18°
    16°
    14°
    Feels like temperature (°C)
    16°
    15°
    15°
    15°
    15°
    15°
    14°
    13°
    Wind direction and speed (mph)
    SW
    4
    SW
    6
    SW
    8
    WSW
    12
    WSW
    14
    WSW
    14
    WSW
    12
    SW
    8
    Wind gust (mph)
    12
    21
    27
    32
    33
    33
    29
    23
    Visibility (description)
    VG
    G
    M
    E
    E
    E
    E
    E
    Humidity
    96%
    96%
    97%
    87%
    65%
    60%
    69%
    84%
    UV - 1 1 3 7 4 1 -
    Friday (27 June 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Overcast Overcast Overcast Overcast Overcast Cloudy Overcast Overcast
    Chance of precipitation
    40%
    40%
    40%
    40%
    50%
    30%
    30%
    30%
    Temperature (°C)
    14°
    15°
    16°
    17°
    18°
    18°
    18°
    16°
    Feels like temperature (°C)
    13°
    13°
    14°
    15°
    16°
    16°
    16°
    15°
    Wind direction and speed (mph)
    SW
    9
    SW
    12
    SW
    12
    SW
    14
    WSW
    16
    WSW
    15
    WSW
    13
    WSW
    10
    Wind gust (mph)
    26
    30
    34
    36
    37
    34
    30
    24
    Visibility (description)
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    Humidity
    85%
    89%
    89%
    88%
    85%
    92%
    92%
    94%
    UV - 1 1 3 6 2 1 -
    Saturday (28 June 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Overcast Overcast Overcast Cloudy Sunny intervals Sunny intervals Sunny intervals Cloudy
    Chance of precipitation
    40%
    40%
    40%
    30%
    20%
    20%
    10%
    10%
    Temperature (°C)
    16°
    15°
    16°
    17°
    19°
    19°
    18°
    16°
    Feels like temperature (°C)
    15°
    14°
    15°
    16°
    17°
    18°
    17°
    16°
    Wind direction and speed (mph)
    WSW
    9
    WSW
    8
    WSW
    7
    WSW
    10
    WSW
    11
    WSW
    10
    WSW
    9
    WSW
    5
    Wind gust (mph)
    20
    18
    21
    23
    23
    21
    16
    8
    Visibility (description)
    G
    G
    G
    G
    VG
    VG
    VG
    G
    Humidity
    94%
    96%
    95%
    90%
    79%
    75%
    78%
    87%
    UV - 1 1 3 5 3 1 -
    Sunday (29 June 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Overcast Overcast Overcast Cloudy Sunny intervals Sunny intervals Sunny intervals Partly cloudy night
    Chance of precipitation
    20%
    20%
    20%
    30%
    20%
    10%
    10%
    10%
    Temperature (°C)
    15°
    14°
    15°
    18°
    20°
    21°
    20°
    17°
    Feels like temperature (°C)
    14°
    14°
    15°
    17°
    19°
    20°
    19°
    17°
    Wind direction and speed (mph)
    WSW
    4
    SW
    4
    SW
    4
    SSW
    7
    SW
    9
    SW
    10
    WSW
    9
    WSW
    6
    Wind gust (mph)
    5
    4
    9
    14
    16
    15
    11
    7
    Visibility (description)
    G
    M
    G
    G
    G
    VG
    VG
    VG
    Humidity
    92%
    95%
    93%
    85%
    77%
    70%
    73%
    86%
    UV - 1 1 4 6 4 1 -

    UK video forecast

    Treharris weather map

    View the weather with our interactive map

    Loading map...

    Wales weather forecast

    Headline:

    Turning increasingly cloudy, with outbreaks of rain.

    This Evening and Tonight:

    Cloud amounts increasing as we move through the evening, with outbreaks of rain spreading eastwards overnight. The rain turning heavy at times during the early hours, mainly over the hills and mountains in the north. Remaining breezy. Minimum temperature 11 °C.

    Tuesday:

    A cloudier start on Tuesday with patchy outbreaks of rain and drizzle, persistent over west-facing hills. Some brighter spells developing through the afternoon, and winds gradually easing. Maximum temperature 20 °C.

    Outlook for Wednesday to Friday:

    Sunny spells and scattered showers on Wednesday. Rather cloudy on Thursday with rain spreading eastwards later into Friday. Increasingly windy by Friday, and temperatures around or a little above average.

    Updated:

    UK long range weather forecast

    More from the Met Office