Harrow (Greater London) weather

Forecast days

Sunny intervals changing to overcast in the afternoon.
Sunrise iconSunrise:
Sunset iconSunset:
M UV
L Pollution

    7 day forecast for Harrow

    Today (20 April 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 Sunny intervals Sunny intervals Cloudy Overcast Cloudy Sunny intervals Sunny intervals Sunny intervals Partly cloudy night Partly cloudy night Clear night Clear night
    Chance of precipitation
    <5%
    <5%
    10%
    20%
    40%
    50%
    30%
    20%
    10%
    10%
    <5%
    <5%
    Temperature
    12°
    12°
    13°
    13°
    13°
    13°
    12°
    12°
    11°
    10°
    Feels like temperature (°C)
    10°
    10°
    11°
    11°
    11°
    11°
    10°
    10°
    Wind direction and speed
    NE
    9
    NE
    9
    NE
    9
    NE
    9
    NE
    9
    NE
    9
    NE
    10
    NE
    10
    NE
    10
    NE
    10
    NE
    10
    NE
    9
    Wind gust (mph)
    21
    20
    21
    20
    20
    21
    20
    19
    18
    17
    16
    15
    Visibility
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    Humidity
    45%
    44%
    43%
    43%
    46%
    47%
    53%
    54%
    58%
    65%
    71%
    75%
    UV 4 3 3 2 2 1 1 1 1 - - -
    Tuesday (21 April 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 Partly cloudy night Partly cloudy night Partly cloudy night Partly cloudy night Partly cloudy night Partly cloudy night Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny intervals Sunny day Sunny day Sunny day Sunny day Clear night 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°
    12°
    13°
    14°
    14°
    15°
    15°
    14°
    13°
    12°
    11°
    Feels like temperature (°C)
    10°
    11°
    11°
    11°
    11°
    11°
    10°
    Wind direction and speed (mph)
    NE
    8
    NE
    8
    NNE
    8
    NNE
    8
    NNE
    8
    NNE
    9
    NNE
    9
    NE
    10
    NE
    11
    NE
    12
    ENE
    13
    ENE
    13
    ENE
    13
    ENE
    13
    ENE
    14
    E
    14
    ENE
    15
    ENE
    15
    ENE
    15
    ENE
    14
    ENE
    13
    ENE
    13
    ENE
    12
    NE
    12
    Wind gust (mph)
    15
    15
    15
    15
    16
    16
    17
    21
    25
    25
    26
    26
    27
    28
    30
    30
    29
    29
    28
    26
    23
    21
    20
    19
    Visibility (description)
    VG
    VG
    G
    G
    G
    G
    G
    G
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    Humidity
    79%
    83%
    85%
    85%
    85%
    86%
    86%
    83%
    75%
    66%
    58%
    54%
    50%
    43%
    41%
    41%
    40%
    39%
    40%
    42%
    48%
    56%
    64%
    68%
    UV - - - - - 1 1 1 1 2 3 3 4 3 3 3 2 1 1 1 1 - - -
    Wednesday (22 April 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 Clear night 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 Clear night 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)
    10°
    13°
    14°
    15°
    16°
    16°
    16°
    16°
    15°
    15°
    14°
    12°
    11°
    10°
    Feels like temperature (°C)
    10°
    11°
    12°
    12°
    12°
    12°
    12°
    12°
    11°
    11°
    10°
    Wind direction and speed (mph)
    NE
    11
    NE
    11
    NE
    11
    NE
    11
    NE
    11
    NE
    10
    ENE
    10
    ENE
    10
    ENE
    11
    ENE
    13
    E
    14
    E
    15
    E
    15
    E
    16
    E
    16
    E
    16
    E
    16
    E
    16
    E
    15
    E
    14
    ENE
    13
    ENE
    12
    ENE
    11
    ENE
    10
    Wind gust (mph)
    19
    19
    19
    19
    18
    18
    18
    21
    25
    28
    30
    31
    32
    32
    33
    32
    32
    30
    28
    25
    22
    21
    19
    18
    Visibility (description)
    VG
    VG
    VG
    VG
    VG
    G
    G
    G
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    G
    G
    Humidity
    74%
    76%
    78%
    83%
    84%
    84%
    85%
    83%
    75%
    65%
    53%
    40%
    39%
    35%
    33%
    27%
    32%
    37%
    39%
    40%
    41%
    49%
    57%
    67%
    UV - - - - - 1 1 1 1 2 3 4 5 5 4 3 2 1 1 1 1 - - -
    Thursday (23 April 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 Clear night Partly cloudy night Partly cloudy night Partly cloudy night Partly cloudy night Partly cloudy night Sunny intervals Sunny intervals 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 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)
    10°
    12°
    14°
    16°
    17°
    18°
    19°
    19°
    18°
    18°
    16°
    15°
    13°
    11°
    10°
    Feels like temperature (°C)
    10°
    12°
    14°
    15°
    15°
    15°
    16°
    15°
    15°
    14°
    12°
    11°
    Wind direction and speed (mph)
    ENE
    10
    ENE
    10
    ENE
    10
    NE
    9
    NE
    9
    NE
    9
    NE
    9
    ENE
    9
    ENE
    10
    ENE
    10
    ENE
    10
    ENE
    10
    E
    10
    E
    11
    E
    11
    E
    11
    E
    11
    ENE
    11
    ENE
    10
    ENE
    10
    ENE
    10
    ENE
    10
    ENE
    10
    ENE
    9
    Wind gust (mph)
    18
    17
    17
    16
    17
    17
    17
    18
    19
    20
    21
    22
    23
    22
    22
    22
    21
    21
    20
    17
    15
    15
    15
    15
    Visibility (description)
    G
    G
    G
    G
    G
    G
    G
    G
    G
    VG
    G
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    G
    G
    G
    Humidity
    74%
    79%
    79%
    82%
    84%
    85%
    85%
    84%
    77%
    72%
    61%
    51%
    42%
    38%
    35%
    34%
    35%
    36%
    39%
    39%
    43%
    50%
    58%
    66%
    UV - - - - - 1 1 1 1 2 3 4 5 5 4 3 2 1 1 1 1 - - -
    Friday (24 April 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 Clear night Clear night Partly cloudy night Partly cloudy night Partly cloudy night Partly cloudy night Sunny intervals Sunny intervals 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 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)
    10°
    12°
    14°
    15°
    17°
    17°
    18°
    18°
    17°
    16°
    15°
    13°
    11°
    10°
    Feels like temperature (°C)
    10°
    12°
    14°
    15°
    15°
    16°
    16°
    15°
    14°
    13°
    11°
    Wind direction and speed (mph)
    ENE
    9
    ENE
    8
    NE
    8
    NE
    8
    NE
    8
    NE
    7
    NE
    8
    NE
    8
    NE
    8
    NE
    8
    NE
    8
    ENE
    8
    ENE
    8
    ENE
    8
    ENE
    8
    ENE
    8
    ENE
    8
    ENE
    8
    NE
    9
    NE
    9
    ENE
    9
    ENE
    9
    ENE
    9
    ENE
    9
    Wind gust (mph)
    14
    13
    13
    13
    13
    14
    14
    16
    17
    17
    18
    19
    19
    19
    19
    19
    18
    18
    18
    17
    16
    16
    15
    15
    Visibility (description)
    G
    G
    M
    M
    M
    M
    M
    M
    G
    G
    G
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    VG
    G
    G
    G
    Humidity
    73%
    78%
    82%
    85%
    87%
    88%
    89%
    86%
    82%
    74%
    66%
    58%
    53%
    44%
    41%
    40%
    39%
    39%
    40%
    42%
    50%
    58%
    65%
    71%
    UV - - - - - 1 1 1 1 2 3 4 5 5 4 3 2 1 1 1 1 - - -
    Saturday (25 April 2026)
    Time
    00:00
    01:00
    04:00
    07:00
    10:00
    13:00
    16:00
    19:00
    22:00
    Weather symbols Partly cloudy night Cloudy Overcast Cloudy Sunny day Sunny day Sunny day Partly cloudy night Partly cloudy night
    Chance of precipitation
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    10%
    10%
    10%
    Temperature (°C)
    13°
    16°
    15°
    12°
    Feels like temperature (°C)
    11°
    14°
    13°
    10°
    Wind direction and speed (mph)
    ENE
    8
    NE
    8
    NE
    7
    NE
    7
    NE
    6
    ENE
    6
    ENE
    6
    NE
    7
    NE
    7
    Wind gust (mph)
    15
    15
    15
    15
    15
    16
    16
    16
    15
    Visibility (description)
    G
    G
    G
    M
    G
    VG
    G
    G
    G
    Humidity
    75%
    78%
    85%
    86%
    77%
    62%
    46%
    51%
    63%
    UV - - - 1 3 5 2 1 -
    Sunday (26 April 2026)
    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 Partly cloudy night Partly cloudy night
    Chance of precipitation
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    <5%
    10%
    Temperature (°C)
    10°
    13°
    16°
    15°
    13°
    Feels like temperature (°C)
    12°
    14°
    14°
    11°
    Wind direction and speed (mph)
    NE
    6
    NE
    5
    NE
    5
    ENE
    6
    E
    5
    ENE
    6
    ENE
    6
    ENE
    7
    Wind gust (mph)
    13
    12
    13
    13
    14
    14
    14
    14
    Visibility (description)
    G
    M
    M
    G
    VG
    G
    VG
    G
    Humidity
    76%
    83%
    85%
    75%
    62%
    52%
    52%
    60%
    UV - - 1 3 5 2 1 -

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    WARNING
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    Flood warnings

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    London & South East England weather forecast

    Headline:

    Sunny start, cloudier later.

    Today:

    A cold but bright start to the day, with sunny spells. Becoming increasingly cloudy into the afternoon with an outside chance of an isolated shower. Light winds. Maximum temperature 16 °C.

    Tonight:

    A dry evening with some late evening sunny spells. Turning cloudier for a time overnight, but likely breaking by dawn. Becoming breezy and chilly. Minimum temperature 1 °C.

    Tuesday:

    A dry and sunny day with a little patchy cloud, mainly in the morning. Becoming increasingly breezy, particularly over hills. Cloud will likely increase overnight from the east. Maximum temperature 16 °C.

    Outlook for Wednesday to Friday:

    Dry with variable amounts of cloud Wednesday to Friday, though increasingly sunny each afternoon as cloud burns back to coasts. Breezy, windy along coasts. Warm, though noticeably cooler near coasts.

    Updated:

    UK long range weather forecast

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