What is the UV index?

The UV index measures the strength of the sun's ultraviolet radiation at the Earth's surface on a scale from 0 (no risk) to 11+ (extreme). In Australia, UV regularly reaches 11+ in summer — among the highest in the world.

When is UV highest in Australia?

UV is strongest between 10am and 3pm AEST/AEDT, typically peaking around solar noon. Levels are highest in summer (December–February) and across northern Australia year-round.

Can you get sunburnt when the UV index is below 3?

Skin damage from UV is unlikely when the index is below 3, so sun protection generally isn't required. However, people with very fair skin or those on photosensitising medication should still take care.

What UV level requires sun protection?

Cancer Council Australia and ARPANSA recommend sun protection (SPF 50+ sunscreen, hat, sunglasses, protective clothing, shade) whenever the UV index reaches 3 or higher.

How accurate is the UV index forecast?

Forecasts use validated solar radiation models (Open-Meteo, ARPANSA, ECMWF) and are accurate to within ±1 UV unit under clear skies. Heavy cloud, smoke or haze can lower actual UV by 20–80%.

Does cloud cover block UV radiation?

No — up to 80% of UV passes through light cloud cover. You can still get sunburnt on overcast days, especially when the forecast UV is 6 or higher.

Wa UV Index — Live Readings & Forecast

Name: UV index observations and forecast — Wa
Creator: Open-Meteo
License: https://open-meteo.com/en/license

Get Western Australia weather alerts

Push, email & SMS notifications for severe weather warnings across your state.

Get alerts

Live UV index across Western Australia

Compare current UV in Perth and regional Western Australia. Peak season: October to March. Tap any card for the full 7-day forecast and SunSmart advice.

Full Western Australia weather forecast

Can't find your location?

Visit our local weather forecast page, search for your town or suburb, and UV information will be shown alongside the weather for that location.

Search locations

7-day UV forecast — Perth

Daily peak UV index for the next week. Sun protection is required whenever UV reaches 3 or above.

Western Australia spans more than 20 degrees of latitude, giving the state Australia's widest UV range. Perth records UV 11+ on most summer days and remains in the high or very-high band for much of the year, while Broome and the Kimberley sit in the extreme band year-round. The state's clear, dry summer skies mean little cloud attenuation, and long daylight hours during daylight saving (which WA does not observe) push solar noon UV peaks to around 12:30pm AWST. ARPANSA recommends sun protection any time the UV index reaches 3 — for most of WA that means every daylight hour from late September through to April.

UV Index Scale & Sun Protection

Low (0–2)
No protection required
Moderate (3–5)
Sunscreen, hat, sunglasses
High (6–7)
Protection essential, seek shade midday
Very High (8–10)
Extra protection, avoid sun 10am–4pm
Extreme (11+)
Stay indoors when possible

Scale follows the WHO/ARPANSA Global Solar UV Index. Source: ARPANSA & Cancer Council Australia.

Sun protection in Western Australia

Cancer Council Western Australia and ARPANSA recommend the SunSmart five whenever the UV index reaches 3: slip on protective clothing, slop on SPF 50+ sunscreen, slap on a broad-brimmed hat, seek shade and slide on sunglasses. UV is invisible and unrelated to temperature — cool, cloudy days still carry sunburn risk in Western Australia.

National UV index hub →7-day Australian UV forecast →Western Australia weather hub →Heatwave forecasts & warnings →

UV Index Western Australia — FAQs

UV data: Open-Meteo. Reference guidance: ARPANSA, Cancer Council Australia, Bureau of Meteorology.