How long can fair skin stay in the sun at UV 5?

Roughly 25–35 minutes unprotected before reddening begins for Fitzpatrick types I–II, based on typical minimal erythemal doses. With properly applied SPF 50+ that stretches substantially, but reapply every two hours.

Officially it's the top of 'moderate' (3–5), one step below 'high'. In practice it demands the same protection: the difference between UV 5 and UV 6 is about two minutes of burn time for fair skin.

How long can you stay in the sun at UV 5?

UV 5 · Moderate

UV 5 is the top of the 'moderate' band, and 'moderate' undersells it: at this level, very fair skin has under half an hour before it starts to redden. It's the strength of a spring midday in Melbourne or a winter midday in Cairns, days that rarely feel dangerous.

Burn times at UV 5, by skin type

Estimated from typical minimal erythemal doses. Reflection off sand, water or snow shortens all times. SPF 50 times assume proper application and are capped at 4 hours, reapply every 2. Educational only.
Skin type	Sun reaction	Unprotected at UV 5	With SPF 50+
I: Very fair	Always burns, never tans	27 min	4 h+
II: Fair	Burns easily, tans minimally	33 min	4 h+
III: Light to medium	Sometimes burns, tans gradually	47 min	4 h+
IV: Olive to tan	Rarely burns, tans easily	1 h	4 h+
V: Brown	Very rarely burns, tans deeply	1 h 20 min	4 h+
VI: Deep brown to black	Almost never burns	2 h 13 min	4 h+

When and where UV 5 happens in Australia

Melbourne, Adelaide and Canberra hit UV 5 at midday through October and again in March. In Sydney it's a September/April midday, or a summer day's 9 am on the way up. Brisbane sees UV 5 around midday in June and July, the depth of winter. In Darwin, UV 5 is roughly what 8:30 in the morning looks like year-round. If you're anywhere in Australia and the app says UV 5 before 10 am, expect the peak to be very high or extreme.

What protection looks like at this level

Full protection is worth it at UV 5, especially for fair skin: sunscreen 20 minutes before heading out, hat, sunnies, and a shirt for longer sessions. This is also the level where reapplication starts to matter, if you're out for more than two hours, the first coat of sunscreen has already had its best innings.

Frequently asked questions

How long can fair skin stay in the sun at UV 5?: Roughly 25–35 minutes unprotected before reddening begins for Fitzpatrick types I–II, based on typical minimal erythemal doses. With properly applied SPF 50+ that stretches substantially, but reapply every two hours.
Is UV 5 high?: Officially it's the top of 'moderate' (3–5), one step below 'high'. In practice it demands the same protection: the difference between UV 5 and UV 6 is about two minutes of burn time for fair skin.

Keep reading

What does UV 5 mean for your skin?

A photo estimates your skin type; the live UV where you stand turns it into your personal burn time.

Check my burn time