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Forecast

Williamstown (30.7444°S, 121.4853°E, 400m AMSL) set as my default location ›

  1. My MLA

  2. Current condition

    TODAY
    Thunderstorms clearing 27° 38°
    thunderstorms clearing
    Chance of rain: 30%
    Likely amount: < 1mm
    First
    light
    Sunrise Sunset Last light
    Sunrise Sunset
    4:16am WST 4:44am WST 6:47pm WST 7:15pm WST
    NOW
    31.5° Feels Like: 26.7°
    Relative Humidity: 14%
    Dew: 0.8°
    Wind: SW 15km/h
    Gust: 17km/h
    Rainfall since 9am: 0.0mm
    Pressure: 1006.9hPa
  3. Today Weather

    Williamstown
    Now
    26.9°c
    Feels Like:
    24.4°
    Wind:
    WNW 13km/h
    Gusts:
    17km/h
    Humidity:
    35%
    Thunderstorms clearing
     
    27°
    Min
    38°
    Max
    Today in Williamstown
    Very hot. Partly cloudy. Slight chance of a shower. The chance of a thunderstorm. Winds E/NE 15 to 25 km/h shifting W/SW 20 to 30 km/h during the morning. Overnight temperatures falling to 23 to 28 with daytime temperatures reaching 37 to 44.
    Tomorrow
    Sunny
    21°
    Min
    32°
    Max
    Mostly sunny. Slight chance of a shower in the east, near zero chance elsewhere. The chance of a thunderstorm in the east in the morning and afternoon. Winds S/SW 20 to 30 km/h tending S/SE during the day. Overnight temperatures falling to between 17 and 25 with daytime temperatures reaching 29 to 37.
  4. Radar

  5. Popup Radar

  6. Warnings

  7. Next 48 Hours


    Next 48 Hours


  8. 7 day forecast

    Today: Very hot. Partly cloudy. Slight chance of a shower. The chance of a thunderstorm. Winds E/NE 15 to 25 km/h shifting W/SW 20 to 30 km/h during the morning. Overnight temperatures falling to 23 to 28 with daytime temperatures reaching 37 to 44.

    Forecast for Williamstown (30.7444°S, 121.4853°E, 400m AMSL)
      Sat Sun Mon Tue Wed Thu Fri
    Summary Thunderstorms clearing Sunny Sunny Sunny Mostly sunny Sunny Sunny
    Minimum 27° 21° 16° 16° 17° 17° 19°
    Maximum 38° 32° 31° 34° 34° 34° 37°
    Chance of rain 30% 5% 5% 20% 20% 5% 5%
    Likely amount < 1mm < 1mm < 1mm < 1mm < 1mm < 1mm < 1mm
    UV index Extreme Extreme Extreme Extreme Extreme - -
    Frost risk Nil Nil Nil Nil Nil Nil Nil
      9am 3pm 9am 3pm 9am 3pm 9am 3pm 9am 3pm 9am 3pm 9am 3pm
    Wind speed 15
    (km/h)
    28
    (km/h)
    12
    (km/h)
    14
    (km/h)
    17
    (km/h)
    15
    (km/h)
    17
    (km/h)
    14
    (km/h)
    19
    (km/h)
    20
    (km/h)
    20
    (km/h)
    20
    (km/h)
    16
    (km/h)
    16
    (km/h)
    Wind direction WSW W SSW SW SE SSE E ESE E ESE E SE E E
    Relative humidity 25% 14% 41% 18% 44% 18% 36% 15% 37% 18% 39% 14% 32% 9%
    Dew point 11°C 6°C 11°C 5°C 9°C 4°C 8°C 4°C 7°C 7°C 9°C 3°C 9°C -0°C
  9. 28 Day Rainfall forecast

    Williamstown Rain Forecast


    Williamstown 28-day Rainfall Forecast
    SUN
    MON
    TUE
    WED
    THU
    FRI
    SAT
    7
    LOW
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    LOW
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    LOW
    Jan 1
    2
    LOW
    3
    4
    LOW
    CHANCE OF RAINFALL WITHIN DISTRICT
    NIL < 25%
    LOW 25% to 50%
    MEDIUM 50% to 75%
    HIGH ≥ 75%
    Issued Dec 6

    Issue Notes

    The hemispheric long wave pattern has remained stable in recent weeks. There are six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, eastern Australia, the south Pacific, South America, and the Atlantic Ocean.

    Summary:

    Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 14 December to 18 December, 26 December to 30 December, and 4 January to 8 January. Rain events originating in the tropics and moving south are possible about 11 December to 15 December, 29 December to 2 January, and 5 January to 9 January. Over Western Australia the strongest cold fronts should occur about 13 December to 17 December, 27 December to 31 December, and 4 January to 8 January.

    Forecast Explanation

    This forecast is produced by a multi-model ensemble consisting of dynamical atmospheric models, which are forced by the latest observed atmosphere, ocean, land and ice conditions. The models are designed to simulate features of the real atmosphere, including the daily movement of long and short wave patterns in the Southern Hemisphere.

    The future probability of rain in each district is estimated using output from the multi-model ensemble, combined with historical information about the difference between the model forecasts and observed rainfall.

    In this deterministic framework the skill of the forecast tends to decrease with time, however the forecasts are updated daily to provide the latest estimates of rainfall probability out to 28 days.

  10. 12 Month Rainfall Forecast

    Williamstown Rain Forecast


    Williamstown 12-month Rainfall Forecast
    Dec
    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
    Oct
    Nov
    2019
    2020
    5
    7
    7
    8
    7
    6
    6
    4
    9
    7
    8
    9
    10
    5
    0
    1
    2 - 3
    4 - 7
    8 - 9
    10
    Well below normal
    Below normal
    Near normal
    Above normal
    Well above normal

    Issue Notes - Issued Nov 8

    ENSO status: Neutral IOD status: Positive Sea surface temperatures (SSTs) across the equatorial central Pacific warmed up slightly over the past few weeks. As a reflection, the Nino3.4 index lingered between 0.5 and 0.7 throughout the month of October. The Southern Oscillation Index (SOI) recorded a value of -5.6 during the past month. The current outlook consensus suggests warmer than average SSTs will persist across the equatorial Pacific Ocean through the coming months, but remaining within neutral values. Five out of eight international models maintain a warmer than average Pacific Ocean through the end of 2019 and first quarter of 2020, however, none of these reaching El Nino thresholds. The IRI ENSO forecast continues to suggest less than 40% of another El Nino developing over the next 12 months, with a neutral ENSO the most likely outcome. To the west of Australia, the Indian Ocean Dipole (IOD) remains strongly positive, with the highest positive value since the early 2000s. All six international models maintain a strong positive event until December. In terms of rainfall, there is little variation to the outlook issued last month. The climate outlook for October continues to favour below average rainfall for most of Australia, in particular the eastern half of the continent. During Positive IODs, central and southeastern Australia tend to see a reduction in rainfall during spring, due to a reduction of moisture streaming from the northwest. For northern Australia, the current outlook is for a late onset of the wet season across the Northern Territory and Queensland. Thus far, Darwin and South Eastern Qld have seen the onset of the wet season this year though a week later than usual. Further south, a negative trend in the Southern Annular Mode (SAM) will continue to enhance frontal activity over the far south during October and early. This is likely to offset the Positive IOD in far southern Victoria and western Tasmania, which could see average-to-above average rainfall during October and early December. Looking further ahead, with no significant signature from ENSO, there are no significant climate drivers tilting the balance towards a drier or wetter summer. The current outlook suggest neutral odds.

  11. Long range rainfall forecast

    Williamstown Rain Forecast


    Williamstown 28-day Rainfall Forecast
    SUN
    MON
    TUE
    WED
    THU
    FRI
    SAT
    7
    LOW
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    LOW
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    LOW
    Jan 1
    2
    LOW
    3
    4
    LOW
    CHANCE OF RAINFALL WITHIN DISTRICT
    NIL < 25%
    LOW 25% to 50%
    MEDIUM 50% to 75%
    HIGH ≥ 75%
    Issued Dec 6

    Issue Notes

    The hemispheric long wave pattern has remained stable in recent weeks. There are six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, eastern Australia, the south Pacific, South America, and the Atlantic Ocean.

    Summary:

    Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 14 December to 18 December, 26 December to 30 December, and 4 January to 8 January. Rain events originating in the tropics and moving south are possible about 11 December to 15 December, 29 December to 2 January, and 5 January to 9 January. Over Western Australia the strongest cold fronts should occur about 13 December to 17 December, 27 December to 31 December, and 4 January to 8 January.

    Forecast Explanation

    This forecast is produced by a multi-model ensemble consisting of dynamical atmospheric models, which are forced by the latest observed atmosphere, ocean, land and ice conditions. The models are designed to simulate features of the real atmosphere, including the daily movement of long and short wave patterns in the Southern Hemisphere.

    The future probability of rain in each district is estimated using output from the multi-model ensemble, combined with historical information about the difference between the model forecasts and observed rainfall.

    In this deterministic framework the skill of the forecast tends to decrease with time, however the forecasts are updated daily to provide the latest estimates of rainfall probability out to 28 days.

  12. Popup - Daily historical

  13. Past 5 Days

    Williamstown Past 5 Days

    This Month
    Minimum Maximum Rainfall
    Monday
    Dec 02
    15.7 °C 33.8 °C
    0.0 mm
    Tuesday
    Dec 03
    20.5 °C 36.6 °C
    0.0 mm
    Wednesday
    Dec 04
    21.2 °C 39.7 °C
    0.0 mm
    Thursday
    Dec 05
    23.2 °C 40.2 °C
    0.0 mm
    Friday
    Dec 06
    21.2 °C 42 °C
    0.0 mm
    Legend
  14. Almanac

    Almanac


    Williamstown minimum temp history (30.7444°S, 121.4853°E, 400m AMSL)
    MAXIMUM TEMPERATURE MINIMUM TEMPERATURE
    Hottest this month 40.0° 05/12/2019 Coldest this month 11.7° 01/12/2019
    Hottest on record 45.0 31/12/1972 Coldest on record 5.5 02/12/1973
    Hottest this year 45.3° 28/02/2019 Coldest this year -0.5° 29/06/2019
    Long term average 32.0° Long term average 16.6°
    Average this month 35.8° Average this month 18.5°
    Hottest December On Record Avg. max. temp. 36.5° 1972 Coldest December on record Avg. min. temp. 14.2° 1952
    Williamstown rainfall history (30.7444°S, 121.4853°E, 400m AMSL)
    RAINFALL
    Wettest This Month 0.0mm 01/12/2019 Total This Month 0.0mm
    0.0 days
    Long Term Average 17.4mm 3.8 days Wettest December on record 88.6mm 1972
  15. Popup - Radar

    Weather Radar for WA

  16. Year to Date

    Williamstown Year To Date

    Average Rainfall To Dec 273.1mm 68.9 day(s)
    Total For 2019 129.6mm 40.0 day(s)
    Total To This Day 2018 322.6mm 78.0 day(s)
    Wettest Day 15.8mm Jun 8
    Lowest Temperature -0.5°C Jun29
    Highest Temperature 45.3°C Feb28
  17. Popup - Monthly historical

  18. Climatology

    Williamstown Climatology

    Long-Term Averages
    Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
    Mean Max (°C) 33.7 32.1 29.4 25.2 20.7 17.5 16.8 18.7 22.3 25.9 29.1 32.0 25.2
    Mean Min (°C) 18.3 17.9 16.1 12.7 8.7 6.2 5.0 5.7 8.0 11.2 14.2 16.6 11.7
    Mean Rain (mm) 27.7 31.0 27.6 20.8 25.6 28.0 25.3 21.7 14.3 15.3 18.4 17.4 273.0
    Mean Rain Days 3.8 4.4 4.5 5.3 7.1 9.2 9.5 7.5 5.5 4.3 4.0 3.8 68.1