Climate Insights for Karratha

The climate in Karratha is hot. The average annual temperature is 26°C and approximately 341mm of precipitation falls per year. March is the wettest month, receiving around 107mm of rainfall. Karratha is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: March, December, January. The coldest months are July, August, June, when temperatures can drop to 18°C.

Karratha sees moderate temperature variation throughout the year, ranging from 18°C to 33°C. The warmest month is March, when average highs reach 33°C and the mean temperature sits around 31°C. July is the coolest month, with minimum temperatures around 18°C and an average of 21°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between April and May, with a 4°C shift in average temperatures.

Karratha is a quite dry location, receiving approximately 341mm of precipitation annually, which averages out to around 28mm per month. The wettest month is March, averaging 107mm of rainfall. February and January also tend to see above-average precipitation. The driest month is October, with just 0mm. That's 107mm less than March, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Karratha is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in April, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.

It is currently winter in Karratha, which began on June 21, 2026. Karratha is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in March at around 33°C, while the coldest stretch bottoms out in July near 18°C. Spring is next, beginning on September 23, 2026 — 92 days from now.

The best time to visit Karratha is during May, June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 13mm per month. By contrast, March can be uncomfortably hot with temperatures reaching 33°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Karratha based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.