Australian Government Bureau of Meteorology
Western Australia
TOP PRIORITY FOR IMMEDIATE BROADCAST
Heatwave Warning
Issued at 01:43 PM WST on Saturday 20 December 2025
Valid for Saturday 20 December 2025 to Tuesday 23 December 2025
Warning for the following areas:
Pilbara and Gascoyne
Safety Advice:
Severe heatwaves can be dangerous for many people, especially older people, babies, children, pregnant and breastfeeding women, people with medical conditions and people who are unwell.
Seek a place to keep cool, such as your home, a library, community centre or shopping centre.
Close your windows and draw blinds, curtains or awnings early in the day to keep the heat out of your home.
If available, use fans or air-conditioners to keep cool.
Maximum temperatures in the high thirties to mid forties and overnight minimum temperatures in the low to high twenties through the Pilbara and northwest parts of the Gascoyne district.
Severe heatwave conditions are likely to persist through until mid next week, reaching a peak over the weekend and the early part of next week. Locations likely to be impacted include Exmouth and Paraburdoo.
The next heatwave warning will be issued by 2:00pm WST on Sunday 21 December 2025
Forecast
Onslow (21.6363°S, 115.1124°E, 3m AMSL) set as my default location ›
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Seven day forecast
Today: Mostly sunny. Slight chance of a shower in the NE in the afternoon and evening. Near zero chance of rain elsewhere. The chance of a thunderstorm. Winds SE/SW 20 to 30 km/h tending NE/SE in the morning then tending NW/NE in the evening. Overnight temperatures falling to around 30 with daytime temperatures reaching 40 to 46.
Forecast for Onslow (21.6363°S, 115.1124°E, 3m AMSL) Sun Mon Tue Wed Thu Fri Sat Summary 
Minimum 30° 28° 27° 27° 27° 27° 27° Maximum 43° 37° 38° 38° 39° 41° 43° Chance of rain 5% 20% 30% 30% 20% 5% 5% Likely amount < 1mm < 1mm < 1mm < 1mm < 1mm < 1mm < 1mm UV index Extreme Extreme Extreme Extreme Extreme Extreme Extreme Fire Danger Rating High High Moderate High - - - 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 20
(km/h)37
(km/h)20
(km/h)29
(km/h)13
(km/h)29
(km/h)12
(km/h)29
(km/h)13
(km/h)33
(km/h)21
(km/h)35
(km/h)29
(km/h)35
(km/h)Wind direction S W NE N E NW W NNW WNW WNW SW WNW SSW WSW Relative humidity 26% 36% 51% 63% 51% 53% 43% 53% 46% 51% 39% 41% 38% 34% Dew point 16°C 21°C 23°C 26°C 23°C 23°C 20°C 24°C 22°C 24°C 20°C 23°C 19°C 22°C -
Warnings
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Sunrise and sunset times
Sunrise / Sunset for Onslow (21.6363°S, 115.1124°E, 3m AMSL) First light Sunrise Sunset Last light Moon rise Moon set Moon phase New moon First quarter Full moon Last quarter 5:09am WST 5:34am WST 7:01pm WST 7:26pm WST 6:13am WST 8:15pm WST 
Waxing crescent
New moon Dec 20 First quarter Dec 28 Full moon Jan 03 Last quarter Jan 11 -
Temperature for next 5 days
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Rain for next 5 days
