Temperature does not determine risk

The sun provides us with light and heat.  However, it is also a source of UV radiation which can have a negative impact on our health.

The spectrum of radiation received on earth from the sun includes infrared, visible and ultraviolet radiation.  The light spectrum ranges from the colour violet to red, just as you would see on a rainbow.  Next to the violet colour is ultraviolet (UV).  This is the radiation to which overexposure can cause harm in humans.  At the other end of the visible light spectrum, next to red is infrared.  This is the type of radiation that creates warmth.

This is an important point to understand because many people think of heat and UV radiation as the same thing. Actually, they represent different areas of the spectrum and are delivered from the sun in different proportions.

Visible light region

When the sun is not visible, we receive no UV radiation.  As the sun rises, the level of UV increases until it reaches its peak at solar noon, when the sun is directly above us.

It’s often the cooler days that result in the worst sunburns because the UV level is high while the temperature is not.  It can be hard to mentally disconnect heat and UV because when it is hot our skin does feel like it is burning, but in reality, the heat we are feeling is the Infra-Red radiation which does not cause sunburn.  Damaging UV is invisible and cannot be felt.  This also explains why it can still be 35 degrees on a late summer  afternoon yet there is far less chance of getting sunburnt.  In fact, even in the middle of summer in Perth the UV level after 5.00pm each day is generally low enough that it’s unlikely to do you much harm.

Conversely, when the weather is cool in Perth in the middle of winter there can still be the need to apply sun protection as the UV level is often above 3.

Understanding the difference between UV and heat, as well as understanding the UV index and the times you are at risk, plus taking sun protective measures can dramatically reduce your risk of skin cancer in the future.

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Western Australia

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Forecast Data

New Zealand

Forecast - Wa


UV level
's Forecast UV Index -
Very High

UV observation courtesy of ARPANSA

UV readings from around AUS
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