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
Cossack (20.6783°S, 117.1886°E, 0m AMSL) set as my default location ›
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7 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 in the afternoon and evening. Winds NE/SE 20 to 30 km/h tending SE/SW 15 to 25 km/h in the late afternoon then tending NW/NE 20 to 30 km/h in the evening. Daytime maximum temperatures 40 to 46.
Forecast for Cossack (20.6783°S, 117.1886°E, 0m AMSL) Sun Mon Tue Wed Thu Fri Sat Summary 
Minimum 29° 28° 29° 29° 29° 29° 29° Maximum 45° 39° 42° 40° 42° 44° 43° Chance of rain 30% 30% 40% 30% 30% 20% 5% Likely amount < 1mm < 1mm < 1mm < 1mm < 1mm < 1mm < 1mm UV index Extreme Extreme Extreme Extreme Extreme Extreme Extreme Fire Danger Rating - - - - - - - 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 37
(km/h)23
(km/h)24
(km/h)27
(km/h)13
(km/h)24
(km/h)15
(km/h)25
(km/h)13
(km/h)25
(km/h)18
(km/h)29
(km/h)17
(km/h)28
(km/h)Wind direction SE NNE ENE NNE SSE N E NNE WNW NNW SW NNW SSE NW Relative humidity 19% 34% 54% 45% 40% 30% 39% 36% 38% 29% 30% 27% 27% 27% Dew point 14°C 22°C 24°C 24°C 22°C 20°C 20°C 20°C 21°C 19°C 18°C 19°C 16°C 19°C -
Sunrise and sunset times
Sunrise / Sunset for Cossack (20.6783°S, 117.1886°E, 0m AMSL) First light Sunrise Sunset Last light Moon rise Moon set Moon phase First quarter Full moon Last quarter New moon 5:03am WST 5:27am WST 6:51pm WST 7:16pm WST 6:07am WST 8:04pm WST 
Waxing crescent
First quarter Dec 28 Full moon Jan 03 Last quarter Jan 11 New moon Jan 19 -
Warnings
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Temperature for next 7 days
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Rain for next 7 days
