Glasfynydd (Usk Reservoir) (Carmarthenshire) weather

Forecast days

Heavy rain.
Sunrise iconSunrise:
Sunset iconSunset:
L UV
L Pollution
No pollen data.

    7 day forecast for Glasfynydd (Usk Reservoir)

    Today (17 September 2025)
    Time
    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 Heavy rain Heavy rain Heavy rain Heavy rain Heavy rain Heavy rain Heavy rain Heavy rain Heavy rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain
    Chance of precipitation
    ≥95%
    ≥95%
    ≥95%
    ≥95%
    ≥95%
    ≥95%
    ≥95%
    ≥95%
    ≥95%
    90%
    80%
    70%
    70%
    70%
    80%
    70%
    70%
    70%
    70%
    Temperature
    12°
    13°
    13°
    14°
    15°
    15°
    15°
    16°
    16°
    16°
    16°
    16°
    16°
    16°
    15°
    15°
    15°
    15°
    15°
    Feels like temperature (°C)
    10°
    10°
    11°
    11°
    12°
    12°
    12°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    Wind direction and speed
    SSW
    19
    SSW
    20
    SW
    21
    SW
    21
    SW
    20
    SW
    20
    SW
    20
    SW
    19
    SW
    19
    SW
    18
    SW
    18
    WSW
    17
    WSW
    16
    SW
    15
    SW
    15
    SW
    13
    SW
    12
    SW
    12
    SW
    12
    Wind gust (mph)
    37
    39
    39
    39
    38
    38
    37
    36
    34
    33
    33
    32
    30
    27
    26
    24
    23
    22
    21
    Visibility
    M
    M
    M
    M
    P
    M
    M
    P
    M
    M
    M
    M
    M
    M
    P
    P
    VP
    VP
    P
    Humidity
    96%
    96%
    98%
    98%
    97%
    97%
    98%
    98%
    98%
    98%
    98%
    98%
    98%
    98%
    99%
    99%
    100%
    100%
    99%
    UV - 1 1 1 1 1 1 1 2 2 2 1 1 1 1 - - - -
    Thursday (18 September 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 Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast
    Chance of precipitation
    70%
    90%
    90%
    90%
    90%
    90%
    ≥95%
    ≥95%
    90%
    80%
    70%
    60%
    50%
    40%
    20%
    10%
    10%
    20%
    30%
    20%
    20%
    20%
    20%
    10%
    Temperature (°C)
    15°
    15°
    15°
    15°
    15°
    15°
    15°
    15°
    15°
    15°
    15°
    16°
    16°
    16°
    17°
    17°
    17°
    17°
    16°
    16°
    16°
    16°
    16°
    15°
    Feels like temperature (°C)
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    13°
    14°
    14°
    14°
    14°
    14°
    14°
    14°
    14°
    13°
    13°
    13°
    Wind direction and speed (mph)
    SW
    12
    SW
    12
    SW
    11
    SW
    12
    SW
    13
    SW
    14
    SW
    15
    SW
    15
    SW
    15
    SW
    16
    SW
    16
    SW
    17
    SW
    17
    SW
    17
    SW
    17
    SW
    17
    SW
    17
    SW
    16
    SW
    16
    SW
    15
    SW
    14
    SW
    14
    SW
    14
    SSW
    13
    Wind gust (mph)
    20
    20
    19
    22
    26
    28
    30
    32
    33
    34
    34
    36
    35
    36
    36
    35
    34
    32
    30
    28
    28
    27
    28
    28
    Visibility (description)
    P
    P
    P
    VP
    VP
    VP
    VP
    VP
    P
    P
    M
    G
    G
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    Humidity
    99%
    99%
    99%
    99%
    100%
    100%
    100%
    100%
    100%
    99%
    99%
    97%
    95%
    93%
    91%
    90%
    89%
    92%
    94%
    93%
    93%
    93%
    93%
    92%
    UV - - - - - - 1 1 1 1 1 1 2 2 2 1 1 1 1 1 - - - -
    Friday (19 September 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 Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast Overcast
    Chance of precipitation
    10%
    20%
    20%
    10%
    10%
    10%
    10%
    20%
    30%
    30%
    30%
    30%
    30%
    30%
    20%
    30%
    40%
    40%
    50%
    40%
    40%
    40%
    30%
    40%
    Temperature (°C)
    15°
    15°
    15°
    15°
    14°
    14°
    14°
    14°
    14°
    14°
    15°
    16°
    16°
    17°
    17°
    17°
    17°
    17°
    16°
    16°
    15°
    15°
    14°
    14°
    Feels like temperature (°C)
    13°
    13°
    13°
    13°
    12°
    12°
    12°
    12°
    12°
    12°
    13°
    14°
    15°
    15°
    16°
    16°
    16°
    16°
    15°
    15°
    14°
    14°
    14°
    14°
    Wind direction and speed (mph)
    SSW
    13
    SSW
    13
    SSW
    13
    SSW
    13
    SSW
    13
    SSW
    12
    SSW
    11
    SSW
    11
    SSW
    10
    SSW
    11
    SSW
    11
    SSW
    11
    SSW
    11
    SSW
    11
    SSW
    11
    SW
    11
    SW
    11
    SW
    10
    SW
    9
    SW
    9
    SW
    8
    SSW
    7
    SSW
    7
    SSW
    6
    Wind gust (mph)
    28
    28
    27
    27
    26
    24
    23
    22
    23
    23
    24
    24
    24
    24
    23
    24
    23
    21
    18
    17
    14
    13
    12
    12
    Visibility (description)
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    G
    G
    Humidity
    92%
    91%
    90%
    92%
    91%
    92%
    92%
    92%
    92%
    90%
    88%
    87%
    86%
    85%
    84%
    83%
    84%
    87%
    90%
    93%
    95%
    96%
    96%
    96%
    UV - - - - - - 1 1 1 1 1 2 2 2 2 1 1 1 1 1 - - - -
    Saturday (20 September 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 Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light rain Light shower day Light shower day Light shower day Light shower day Sunny intervals Sunny intervals Partly cloudy night Partly cloudy night Partly cloudy night Partly cloudy night Light shower night
    Chance of precipitation
    50%
    50%
    60%
    60%
    60%
    60%
    60%
    60%
    60%
    60%
    50%
    60%
    60%
    60%
    60%
    60%
    50%
    50%
    40%
    50%
    50%
    50%
    50%
    50%
    Temperature (°C)
    14°
    14°
    14°
    13°
    13°
    13°
    13°
    12°
    12°
    12°
    13°
    13°
    13°
    14°
    14°
    14°
    13°
    13°
    13°
    12°
    11°
    11°
    11°
    10°
    Feels like temperature (°C)
    13°
    13°
    13°
    13°
    12°
    12°
    12°
    11°
    11°
    11°
    11°
    11°
    12°
    12°
    12°
    12°
    11°
    11°
    11°
    10°
    Wind direction and speed (mph)
    SSW
    6
    SSW
    6
    SW
    6
    SW
    5
    SW
    5
    SW
    5
    SW
    5
    SW
    5
    SW
    6
    WSW
    7
    WSW
    8
    WSW
    9
    WSW
    9
    WSW
    10
    WSW
    10
    W
    11
    W
    11
    W
    10
    W
    10
    W
    9
    W
    8
    WSW
    7
    WSW
    7
    WSW
    7
    Wind gust (mph)
    12
    11
    9
    10
    11
    11
    11
    13
    14
    15
    15
    18
    18
    19
    23
    23
    21
    20
    19
    14
    13
    13
    13
    13
    Visibility (description)
    G
    G
    G
    G
    G
    G
    G
    G
    G
    G
    G
    VG
    VG
    VG
    E
    E
    E
    E
    E
    E
    E
    VG
    VG
    VG
    Humidity
    97%
    97%
    97%
    97%
    97%
    97%
    97%
    97%
    96%
    94%
    94%
    91%
    87%
    85%
    86%
    84%
    83%
    82%
    85%
    88%
    90%
    90%
    90%
    91%
    UV - - - - - - 1 1 1 1 1 2 2 3 3 2 1 1 1 1 - - - -
    Sunday (21 September 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 Light shower night Light shower night Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Light shower day Light shower day Light shower day Cloudy Cloudy Sunny intervals Sunny intervals Partly cloudy night Partly cloudy night Partly cloudy night Partly cloudy night Partly cloudy night
    Chance of precipitation
    60%
    60%
    50%
    50%
    40%
    50%
    50%
    40%
    40%
    40%
    40%
    50%
    60%
    60%
    60%
    50%
    50%
    40%
    40%
    30%
    30%
    30%
    20%
    20%
    Temperature (°C)
    10°
    10°
    10°
    10°
    11°
    11°
    11°
    11°
    11°
    11°
    11°
    10°
    Feels like temperature (°C)
    Wind direction and speed (mph)
    W
    7
    W
    6
    W
    6
    WSW
    6
    W
    7
    NNW
    7
    NNE
    7
    NNE
    7
    NNE
    8
    NNE
    9
    NNE
    10
    NNE
    11
    NNE
    12
    NNE
    12
    NNE
    12
    N
    13
    NNE
    13
    NNE
    12
    NNE
    12
    NNE
    11
    NE
    10
    NE
    9
    NE
    9
    NE
    8
    Wind gust (mph)
    12
    10
    10
    9
    10
    12
    14
    15
    19
    20
    23
    25
    24
    26
    25
    25
    25
    23
    20
    19
    20
    20
    19
    17
    Visibility (description)
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    Humidity
    92%
    92%
    93%
    94%
    93%
    93%
    93%
    92%
    91%
    89%
    85%
    82%
    78%
    76%
    74%
    75%
    74%
    73%
    75%
    77%
    80%
    81%
    82%
    83%
    UV - - - - - - - 1 1 1 2 3 3 3 3 2 1 1 1 1 - - - -
    Monday (22 September 2025)
    Time
    00:00
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Partly cloudy night Partly cloudy night Partly cloudy night Sunny intervals Sunny intervals Sunny intervals Sunny intervals Partly cloudy night Partly cloudy night
    Chance of precipitation
    20%
    10%
    10%
    <5%
    10%
    10%
    <5%
    <5%
    <5%
    Temperature (°C)
    12°
    12°
    Feels like temperature (°C)
    Wind direction and speed (mph)
    NE
    8
    NE
    8
    ENE
    7
    NNE
    7
    NE
    10
    NNE
    12
    NNE
    11
    NNE
    9
    NNE
    7
    Wind gust (mph)
    18
    17
    14
    20
    23
    23
    20
    13
    11
    Visibility (description)
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    Humidity
    83%
    83%
    85%
    86%
    70%
    58%
    56%
    71%
    79%
    UV - - - 1 2 4 2 1 -
    Tuesday (23 September 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Partly cloudy night Partly cloudy night Sunny intervals Sunny intervals Cloudy Sunny intervals Partly cloudy night Partly cloudy night
    Chance of precipitation
    <5%
    <5%
    10%
    10%
    10%
    10%
    10%
    10%
    Temperature (°C)
    12°
    12°
    Feels like temperature (°C)
    10°
    10°
    Wind direction and speed (mph)
    NE
    6
    NE
    6
    NE
    6
    NE
    9
    NE
    11
    NE
    11
    NNE
    8
    NNE
    6
    Wind gust (mph)
    9
    8
    13
    19
    19
    17
    10
    9
    Visibility (description)
    VG
    VG
    G
    VG
    VG
    VG
    VG
    VG
    Humidity
    85%
    86%
    88%
    74%
    62%
    63%
    80%
    87%
    UV - - 1 2 4 1 1 -

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    WARNING
    Flood alerts icon
    Flood alerts in force for Wales
    Flood alerts in force for Wales

    Wales weather forecast

    Headline:

    Heavy and persistent rain.

    Today:

    Heaviest and most persistent rain clearing eastwards through the morning, though remaining cloudy with outbreaks of patchy rain and drizzle throughout the day, turning heavy at times over the hills. Breezy. Maximum temperature 19 °C.

    Tonight:

    Rain persisting throughout this evening and overnight, this turning heavy at times especially over the hills and mountains. Windy for all, especially along the coasts, and feeling humid. Minimum temperature 8 °C.

    Thursday:

    A cloudy, damp and mild start to Thursday. Cloud breaking in the east but drizzle persisting over the hills in the west. Staying windy. Maximum temperature 18 °C.

    Outlook for Friday to Sunday:

    Remaining changeable with showers or longer spells of rain at times. Some brighter periods are also likely, mainly on Friday. Temperatures close to average but turning colder later Sunday. Breezy.

    Updated:

    UK long range weather forecast

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