Glasfynydd (Usk Reservoir) (Carmarthenshire) weather

Forecast days

Sunny.
Sunrise iconSunrise:
Sunset iconSunset:
H UV
L Pollution

    8 day forecast for Glasfynydd (Usk Reservoir)

    Today (17 May 2025)
    Time
    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 Clear night Clear night Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Clear night Clear night Clear night
    Chance of precipitation
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    Temperature
    10°
    12°
    13°
    15°
    16°
    17°
    18°
    18°
    19°
    19°
    18°
    16°
    13°
    11°
    10°
    Feels like temperature (°C)
    10°
    12°
    14°
    15°
    16°
    16°
    17°
    17°
    17°
    17°
    15°
    13°
    11°
    10°
    Wind direction and speed
    E
    8
    E
    8
    E
    7
    E
    8
    E
    8
    E
    8
    ENE
    8
    ENE
    7
    ENE
    7
    ENE
    6
    ENE
    6
    ENE
    6
    ENE
    5
    ENE
    5
    ENE
    5
    ENE
    6
    ENE
    5
    NE
    5
    S
    4
    SSE
    4
    E
    4
    Wind gust (mph)
    12
    12
    13
    14
    16
    17
    16
    16
    16
    16
    17
    16
    16
    16
    15
    14
    12
    11
    11
    11
    12
    Visibility
    VG
    VG
    G
    G
    G
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    Humidity
    74%
    79%
    85%
    89%
    85%
    79%
    74%
    68%
    63%
    57%
    54%
    45%
    41%
    40%
    40%
    40%
    41%
    63%
    73%
    77%
    76%
    UV - - 1 1 1 2 3 4 6 6 7 6 5 3 2 1 1 1 1 - -
    Sunday (18 May 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 Clear night Clear night Clear night Clear night Clear night Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Sunny day Clear night Clear night Clear night
    Chance of precipitation
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    Temperature (°C)
    11°
    10°
    10°
    10°
    12°
    13°
    15°
    16°
    17°
    18°
    19°
    19°
    19°
    19°
    19°
    18°
    16°
    14°
    13°
    12°
    Feels like temperature (°C)
    10°
    12°
    14°
    15°
    16°
    16°
    17°
    17°
    17°
    17°
    17°
    16°
    15°
    13°
    11°
    11°
    Wind direction and speed (mph)
    ENE
    6
    E
    7
    E
    8
    E
    8
    ESE
    8
    ESE
    8
    ESE
    7
    ESE
    6
    E
    6
    E
    5
    ENE
    5
    NNE
    5
    NNE
    5
    NNE
    5
    NNE
    6
    NNE
    6
    NE
    7
    NE
    7
    NE
    7
    NE
    6
    NE
    5
    E
    5
    E
    6
    E
    7
    Wind gust (mph)
    14
    14
    14
    13
    12
    11
    10
    9
    10
    12
    15
    16
    16
    17
    18
    19
    18
    18
    16
    12
    11
    12
    13
    14
    Visibility (description)
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    E
    E
    E
    E
    E
    E
    E
    E
    E
    VG
    VG
    VG
    VG
    Humidity
    73%
    72%
    73%
    74%
    76%
    78%
    79%
    75%
    70%
    63%
    55%
    43%
    40%
    40%
    40%
    40%
    40%
    40%
    41%
    42%
    57%
    60%
    58%
    57%
    UV - - - - - 1 1 1 2 3 4 6 6 7 6 5 3 2 1 1 1 1 - -
    Monday (19 May 2025)
    Time
    00:00
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Clear night Clear night Sunny day Sunny day Sunny intervals Sunny intervals Sunny intervals Sunny intervals Clear night
    Chance of precipitation
    <5%
    <5%
    10%
    10%
    10%
    40%
    30%
    10%
    <5%
    Temperature (°C)
    12°
    11°
    14°
    16°
    18°
    17°
    12°
    Feels like temperature (°C)
    10°
    11°
    14°
    16°
    15°
    11°
    Wind direction and speed (mph)
    E
    8
    ESE
    9
    ESE
    10
    ESE
    10
    E
    11
    E
    9
    E
    8
    NE
    6
    E
    6
    Wind gust (mph)
    15
    16
    17
    23
    23
    23
    20
    14
    14
    Visibility (description)
    VG
    VG
    VG
    VG
    VG
    E
    E
    E
    VG
    Humidity
    60%
    63%
    75%
    78%
    59%
    42%
    43%
    51%
    65%
    UV - - - 1 4 6 3 1 -
    Tuesday (20 May 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Clear night Sunny day Sunny day Sunny day Sunny intervals Sunny intervals Sunny intervals Partly cloudy night
    Chance of precipitation
    <5%
    <5%
    <5%
    20%
    30%
    20%
    <5%
    10%
    Temperature (°C)
    10°
    15°
    18°
    17°
    17°
    12°
    Feels like temperature (°C)
    14°
    16°
    16°
    16°
    11°
    Wind direction and speed (mph)
    ESE
    8
    ESE
    8
    ESE
    7
    E
    7
    ENE
    7
    ENE
    7
    WNW
    6
    SW
    4
    Wind gust (mph)
    14
    13
    13
    19
    20
    17
    13
    10
    Visibility (description)
    VG
    VG
    VG
    VG
    E
    E
    E
    VG
    Humidity
    66%
    74%
    73%
    55%
    42%
    46%
    54%
    67%
    UV - - 1 4 5 3 1 -
    Wednesday (21 May 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Partly cloudy night Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Partly cloudy night
    Chance of precipitation
    20%
    20%
    20%
    30%
    30%
    30%
    20%
    20%
    Temperature (°C)
    10°
    10°
    14°
    16°
    16°
    14°
    10°
    Feels like temperature (°C)
    10°
    13°
    14°
    13°
    12°
    Wind direction and speed (mph)
    SSE
    4
    SSW
    4
    SW
    4
    W
    6
    WNW
    9
    WNW
    11
    WNW
    10
    W
    7
    Wind gust (mph)
    9
    8
    14
    20
    24
    23
    18
    10
    Visibility (description)
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    Humidity
    77%
    80%
    74%
    62%
    54%
    51%
    60%
    85%
    UV - - 1 3 6 3 1 -
    Thursday (22 May 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Partly cloudy night Sunny intervals Sunny intervals Sunny intervals Cloudy Sunny intervals Sunny intervals Partly cloudy night
    Chance of precipitation
    20%
    20%
    20%
    20%
    30%
    30%
    30%
    30%
    Temperature (°C)
    13°
    15°
    15°
    14°
    10°
    Feels like temperature (°C)
    11°
    13°
    13°
    12°
    Wind direction and speed (mph)
    WSW
    7
    WNW
    6
    WNW
    6
    WNW
    9
    WNW
    11
    WNW
    11
    WNW
    10
    W
    7
    Wind gust (mph)
    6
    7
    16
    22
    24
    23
    17
    8
    Visibility (description)
    G
    G
    VG
    VG
    VG
    G
    VG
    G
    Humidity
    92%
    93%
    85%
    69%
    58%
    65%
    66%
    89%
    UV - - 1 4 5 3 1 -
    Friday (23 May 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Cloudy Cloudy Cloudy Sunny intervals Sunny intervals Sunny intervals Sunny intervals Partly cloudy night
    Chance of precipitation
    30%
    30%
    40%
    30%
    30%
    20%
    20%
    20%
    Temperature (°C)
    13°
    14°
    14°
    13°
    10°
    Feels like temperature (°C)
    11°
    12°
    12°
    11°
    Wind direction and speed (mph)
    W
    7
    W
    7
    W
    7
    W
    9
    W
    11
    WNW
    11
    WNW
    10
    W
    7
    Wind gust (mph)
    7
    8
    17
    22
    23
    22
    18
    9
    Visibility (description)
    G
    G
    G
    G
    G
    G
    VG
    G
    Humidity
    95%
    95%
    93%
    82%
    63%
    64%
    69%
    90%
    UV - - 1 3 5 3 1 -
    Saturday (24 May 2025)
    Time
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    Weather symbols Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy No weather symbol data
    Chance of precipitation
    30%
    30%
    30%
    40%
    50%
    40%
    Temperature (°C)
    10°
    13°
    14°
    15°
    14°
    Feels like temperature (°C)
    11°
    13°
    13°
    12°
    Wind direction and speed (mph)
    SW
    6
    SW
    6
    SSW
    6
    SW
    9
    SW
    10
    WSW
    11
    WSW
    10
    Wind gust (mph)
    7
    7
    15
    20
    23
    21
    Visibility (description)
    G
    G
    G
    G
    G
    G
    M
    Humidity
    94%
    95%
    91%
    84%
    78%
    81%
    90%
    UV - - 1 3 3 2 1

    UK video forecast

    Glasfynydd (Usk Reservoir) weather map

    View the weather with our interactive map

    Loading map...

    Wales weather forecast

    Headline:

    Staying dry and often sunny. Warm days and cool nights.

    This Evening and Tonight:

    Staying sunny and warm into this evening, then clear skies at first overnight. Probably turning cloudier in the east later. Turning chilly where skies stay clear, with a frost possible in very prone inland and rural spots in the north. Minimum temperature 2 °C.

    Saturday:

    A cloudy and cool start for some but sunshine for western areas. Brightening up in the east with plenty of strong sunshine by the afternoon. Feeling warm with light winds. Maximum temperature 21 °C.

    Outlook for Sunday to Tuesday:

    Most places remaining dry through this period. Whilst some cloud is likely at times, there'll also be plenty of warm sunshine. Small chance of isolated showers on Monday and Tuesday.

    Updated:

    UK long range weather forecast

    More from the Met Office