Hillarys Beach Water Temperature & Swim Forecast
Popular Western Australia beach near Perth.
Mild water with a light chop and a light breeze — comfortable conditions for most swimmers.
Model estimate · modelled, not a buoy measurement. How accurate is this?
Location
Hillarys Beach on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
3/2mm fullsuit
At 18.7°C a 3/2mm fullsuit is the standard wetsuit for surfing and watersports.
Recommendation tuned for Hillarys Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Hillarys Beach swimming conditions summary
- Water temperature
- 18.7°C
- Water feels
- Refreshing
- Swimmable today
- Yes, but fresh — short swims or a wetsuit
- Swim conditions score
- 69/100 · Good
- Wetsuit needed
- 3/2mm fullsuit
- Air temperature
- —
- Waves
- —
- Wind
- —
- UV index
- —
- Average sea temperature (September)
- 19.0 °C
- Warmest months to swim
- January, February, March
At 18.7°C a 3/2mm fullsuit is the standard wetsuit for surfing and watersports. Model estimate. Water, wave, wind and UV values are Open-Meteo marine/weather model estimates, refreshed hourly — not buoy measurements.
Frequently asked questions
Can I swim at Hillarys Beach right now?
The sea at Hillarys Beach is currently 18.7°C — fresh swimming conditions. Most swimmers will find the water comfortable when it's above 22°C; below 18°C feels fresh and a wetsuit is recommended.
What will the sea temperature be at Hillarys Beach next week?
Based on long-term September averages and the latest marine model, expect the sea around Hillarys Beach to sit close to 19.7°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.
When is the best month to swim at Hillarys Beach?
January – February – March are typically the warmest months to swim at Hillarys Beach, with sea temperatures at their seasonal peak.
Do I need a wetsuit at Hillarys Beach?
With water currently at 18.7°C: above 22°C no wetsuit needed; 18–22°C a shorty is comfortable for long swims; 14–18°C a 3/2mm full suit; below 14°C a 4/3mm or thicker.
Can I swim at Hillarys Beach today?
The sea is currently 18.7°C — good swimming conditions. Most swimmers will find it pleasant.
- • Located in Western Australia, Australia (Indian Ocean).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — based on regional climatology.
Best time to swim in Hillarys Beach
The sea in Hillarys Beach peaks in February, when the water averages around 23°C.
The main swimming season runs from October – May, when surface temperatures stay comfortable for extended sessions.
On average, 8 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like September and June are noticeably cooler but often quieter, with fewer crowds and steadier weather.
The coldest month is typically July at around 18°C, when cold-water swimmers dominate the coast.
Hillarys Beach sits in the Southern Hemisphere, so the warmest sea coincides with the December–February summer and the coolest with July–August.
Hillarys Beach sea temperature history
Long-term climatology for Hillarys Beach shows an annual mean sea temperature of 20°C, ranging from 18°C in winter to 23°C at the summer peak.
The seasonal swing is roughly 5°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Hillarys Beach, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Hillarys Beach sea temperature: frequently asked questions
What is the warmest month to swim in Hillarys Beach?
February is the warmest month in Hillarys Beach, when the sea averages about 23°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Hillarys Beach?
The coldest month in Hillarys Beach is typically July, when the water averages around 18°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Hillarys Beach without a wetsuit?
The main swimming season in Hillarys Beach runs from October – May — about 8 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Hillarys Beach?
Outside peak summer the water in Hillarys Beach drops toward 18°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Hillarys Beach?
The long-term annual mean sea temperature in Hillarys Beach is about 20°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Hillarys Beach?
The live reading at the top of this page shows the current sea temperature in Hillarys Beach, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: Jan – Feb – Mar – Apr – May – Oct – Nov – Dec
| Month | Sea | Comfort |
|---|---|---|
| Jan | 22°C | Warm |
| Feb ⭐ | 23°C | Warm |
| Mar | 22°C | Warm |
| Apr | 21°C | Pleasant |
| May | 20°C | Pleasant |
| Jun | 19°C | Pleasant |
| Jul | 18°C | Pleasant |
| Aug | 18°C | Pleasant |
| Sep | 19°C | Pleasant |
| Oct | 20°C | Pleasant |
| Nov | 21°C | Pleasant |
| Dec | 22°C | Warm |
Nearby beaches
The closest coastline, with live water temperatures.