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Forecast

Derby (17.3048°S, 123.6325°E, 10m AMSL) set as my default location ›

  1. My MLA

  2. Current condition

    TODAY
    Sunny 20° 36°
    Chance of rain: 5%
    Likely amount: < 1mm
    First
    light
    Sunrise Sunset Last light
    Sunrise Sunset
    5:16am WST 5:37am WST 5:41pm WST 6:03pm WST
    NOW
    24.5° Feels Like: 26.1°
    Relative Humidity: 80%
    Dew: 20.8°
    Wind: SE 13km/h
    Gust: 13km/h
    Rainfall since 9am: 0.0mm
    Pressure: 1014.0hPa
  3. Today Weather

    Derby
    Now
    22.9°c
    Feels Like:
    26.6°
    Wind:
    N 0km/h
    Gusts:
    2km/h
    Humidity:
    84%
    Sunny
     
    20°
    Min
    36°
    Max
    Today in Derby
    Areas of fog early this morning. Sunny day. Winds NE/SE 15 to 20 km/h becoming light in the morning then becoming NW/SW 15 to 20 km/h in the early afternoon. Daytime maximum temperatures in the mid to high 30s.
    Tomorrow
    Sunny
    20°
    Min
    38°
    Max
    Sunny morning. Areas of morning fog in the northwest. The chance of a shower or thunderstorm in the north in the afternoon and evening. Light winds becoming NW/SW 15 to 20 km/h in the early afternoon then becoming light in the evening. Overnight temperatures falling to between 15 and 22 with daytime temperatures reaching around 40.
  4. Radar

  5. Popup Radar

  6. Warnings

    There are no current warnings for Derby

  7. Next 48 Hours


    Next 48 Hours


  8. 7 day forecast

    Today: Areas of fog early this morning. Sunny day. Winds NE/SE 15 to 20 km/h becoming light in the morning then becoming NW/SW 15 to 20 km/h in the early afternoon. Daytime maximum temperatures in the mid to high 30s.

    Forecast for Derby (17.3048°S, 123.6325°E, 10m AMSL)
      Sat Sun Mon Tue Wed Thu Fri
    Summary Sunny Sunny Mostly sunny Sunny Sunny Sunny Mostly sunny
    Minimum 20° 20° 22° 22° 21° 21° 22°
    Maximum 36° 38° 39° 40° 39° 38° 37°
    Chance of rain 5% 5% 5% 5% 5% 10% 40%
    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 8
    (km/h)
    22
    (km/h)
    10
    (km/h)
    21
    (km/h)
    22
    (km/h)
    22
    (km/h)
    25
    (km/h)
    22
    (km/h)
    18
    (km/h)
    22
    (km/h)
    10
    (km/h)
    24
    (km/h)
    9
    (km/h)
    25
    (km/h)
    Wind direction SSW NNW SSW WNW SSE SW SE S SE NW NE NNW E NNW
    Relative humidity 52% 22% 49% 21% 25% 16% 16% 14% 22% 20% 44% 29% 49% 35%
    Dew point 18°C 10°C 18°C 12°C 10°C 8°C 4°C 7°C 9°C 12°C 18°C 16°C 20°C 18°C
  9. 28 Day Rainfall forecast

    Derby Rain Forecast


    Derby 28-day Rainfall Forecast
    SUN
    MON
    TUE
    WED
    THU
    FRI
    SAT
    19
    20
    21
    22
    LOW
    23
    LOW
    24
    LOW
    25
    LOW
    26
    27
    28
    29
    30
    Oct 1
    2
    3
    LOW
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    CHANCE OF RAINFALL WITHIN DISTRICT
    NIL < 25%
    LOW 25% to 50%
    MEDIUM 50% to 75%
    HIGH ≥ 75%
    Issued Sep18

    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 southwest Indian Ocean, the Indian Ocean, Western Australia, eastern Australia, and South America.

    Summary:

    Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 24 September to 28 September, 1 October to 5 October, and 11 October to 15 October. Rain events originating in the tropics and moving south are possible about 18 October to 22 October. Over Western Australia the strongest cold fronts should occur about 27 September to 1 October, 8 October to 12 October, and 14 October to 18 October.

    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

    Derby Rain Forecast


    Derby 12-month Rainfall Forecast
    Sep
    Oct
    Nov
    Dec
    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    2020
    2021
    8
    8
    8
    7
    7
    7
    8
    1
    7
    9
    9
    10
    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 Sep 9

    ENSO status: La Niña Alert IOD status: Negative SAM status: Negative trending positive Sea surface temperatures (SSTs) across the equatorial central Pacific have continued to cool through August, with the Nino3.4 index registering a value of -0.5. The Southern Oscillation Index (SOI) recorded a value of 9.8 in the same month, a significant increase compared to July, tipping over the La Niña threshold of +7. The current outlook suggests that cooler than average SSTs will continue across the equatorial pacific during the Austral spring, with a high chance of a weak La Niña forming. All eight international models continue to suggest further cooling during spring, with three of these indicating La Niña conditions in September. A further two exceeding the La Niña threshold in October, with six of the eight indicating La Niña by November. The current International Research Institute for Climate and Society (IRI) outlook suggests a 57:41 chance for La Niña:Neutral conditions by the end of the Australspring. To the west of Australia, the Indian Ocean Dipole (IOD) has shifted into a negative phase. Four of the six international models indicate a negative IOD to be sustained for the duration of the Austral spring, with the remaining two indicating a neutral phase. Both of the models that indicate a neutral phase trend towards the negative side of neutral. In terms of precipitation over Australia, the current short term outlook favours above average rainfall over the interior over the remainder of the first month of spring, particularly eastern WA and the Kimberley, western NT and western SA Above average rainfall is also favoured, although not as pronounced, over inland NSW and QLD and parts of the NSW and VIC coastal area. Drier than average conditions are expected across western WA as well as parts of northern coastal QLD and parts of the southeast. The remainder of spring is then likely to be wetter than average for NSW, QLD, VIC, SA, TAS, the NT and eastern WA, whilst drier than averageconditions look to persist further west. There are then indications of increased rainfall over WA toward the end of spring and into early summer, with the eastern two thirds of the country remaining wetter than average.

  11. Long range rainfall forecast

    Derby Rain Forecast


    Derby 28-day Rainfall Forecast
    SUN
    MON
    TUE
    WED
    THU
    FRI
    SAT
    19
    20
    21
    22
    LOW
    23
    LOW
    24
    LOW
    25
    LOW
    26
    27
    28
    29
    30
    Oct 1
    2
    3
    LOW
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    CHANCE OF RAINFALL WITHIN DISTRICT
    NIL < 25%
    LOW 25% to 50%
    MEDIUM 50% to 75%
    HIGH ≥ 75%
    Issued Sep18

    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 southwest Indian Ocean, the Indian Ocean, Western Australia, eastern Australia, and South America.

    Summary:

    Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 24 September to 28 September, 1 October to 5 October, and 11 October to 15 October. Rain events originating in the tropics and moving south are possible about 18 October to 22 October. Over Western Australia the strongest cold fronts should occur about 27 September to 1 October, 8 October to 12 October, and 14 October to 18 October.

    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

    Derby Past 5 Days

    This Month
    Minimum Maximum Rainfall
    Monday
    Sep 14
    23.1 °C 36.1 °C
    0.0 mm
    Tuesday
    Sep 15
    23.7 °C 39.2 °C
    0.4 mm
    Wednesday
    Sep 16
    19.4 °C 36.9 °C
    0.0 mm
    Thursday
    Sep 17
    25.6 °C 36.0 °C
    0.0 mm
    Friday
    Sep 18
    20.4 °C 35.6 °C
    0.0 mm
    Legend
  14. Almanac

    Almanac


    Derby minimum temp history (17.3048°S, 123.6325°E, 10m AMSL)
    MAXIMUM TEMPERATURE MINIMUM TEMPERATURE
    Hottest this month 40.1° 04/09/2020 Coldest this month 15.2° 01/09/2020
    Hottest on record 42.1 26/09/2003 Coldest on record 9.1 02/09/2001
    Hottest this year 41.1° 23/04/2020 Coldest this year 9.5° 30/07/2020
    Long term average 35.4° Long term average 19.4°
    Average this month 37.4° Average this month 20.5°
    Hottest September On Record Avg. max. temp. 37.4° 2008 Coldest September on record Avg. min. temp. 16.6° 2011
    Derby rainfall history (17.3048°S, 123.6325°E, 10m AMSL)
    RAINFALL
    Wettest This Month 0.4mm 15/09/2020 Total This Month 0.4mm
    1.0 days
    Long Term Average 1.0mm 0.1 days Wettest September on record 40.4mm 1974
    Driest on record 0.0mm 1951
  15. Popup - Radar

    Weather Radar for WA

  16. Year to Date

    Derby Year To Date

    Average Rainfall To Sep 608.6mm 42.3 day(s)
    Total For 2020 666.0mm 36.0 day(s)
    Total To This Day 2019 343.8mm 40.0 day(s)
    Wettest Day 152.8mm Jan 7
    Lowest Temperature 9.5°C Jul30
    Highest Temperature 41.1°C Apr23
  17. Popup - Monthly historical

  18. Climatology

    Climate History

    Derby Climatology

    Long-Term Averages
    Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
    Mean Max (°C) 35.2 34.5 35.3 35.7 32.9 30.5 30.7 32.6 35.4 37.2 38.2 37.2 34.6
    Mean Min (°C) 25.7 25.4 25.1 22.8 18.9 15.8 14.8 15.9 19.4 23.2 25.5 26.3 21.5
    Mean Rain (mm) 202.5 211.1 140.3 20.3 18.6 6.9 6.7 1.2 1.0 2.7 10.5 78.0 682.0
    Mean Rain Days 13.2 12.6 10.1 2.9 1.6 1.0 0.6 0.2 0.1 1.0 2.0 7.4 46.5