Tell us about your exposure
Verdict
How to read this
The UV index is a single-number scale used worldwide by the WHO. 0–2 is low (no protection). 5–6 is moderate-to-high. 8–10 is very high — common in Fiji from late September to early February. 11+ is extreme — and yes, Fiji regularly hits 13–14 in the worst weeks.
Two things make southern-hemisphere UV deceptive. First, the sun is steepest overhead in December–February, not June. Travellers from the northern hemisphere expect the sun to be "gentler in winter" — it isn't. January in Nadiakilo and February in Cairns have nearly identical UV peaks. Second, the South Pacific ozone layer is thinnest in August to early October. That's counter-intuitive: the calendar summer peaks the sun angle, but the late winter / early spring is when ozone dips above Fiji and Australia, raising UVB by 10–15%.
Reef glare matters more than most guides admit. Open water reflects about 10% of UV back at you. Sand reflects 15–25%. White boat decks up to 30%. The "shade" selector captures this: full bures / forest cuts out roughly half the UV; an umbrella or boat bimini cuts a third; open beach leaves you in the full beam; reef glare over shallow water adds another 10–15% on top.
The "safe minutes" figure is for your skin type to redness, assuming correctly-applied SPF. If you wear a rashie and a hat, that number extends roughly 3–4×. The SPF recommendation is the minimum you'd want for the listed conditions — if you'll be in and out, go higher.
Limits
- This is a modelled UV index, not a live reading. Live UV is published by the Fiji Meteorological Service and ARPANSA — they update hourly.
- Cloud cover does reduce UV, but not as much as you'd think: a thick overcast day in Fiji still hits 4–6 UV at the peak. This model assumes typical scattered-cloud conditions.
- Altitude isn't a factor in Fiji (max Mt Tomanivi 1,324 m) so we ignore the 10–12%/1000 m rule.
- Skin type is self-reported. If you're unsure, err toward the fairer side.
- SPF numbers above 50 give diminishing returns and are not separately recommended; we cap at SPF 50.
- Reef-safe / oxybenzone-free sunscreens are the right choice for Fiji's reefs. This tool does not pick a brand.
- Children, pregnant travellers and anyone on photosensitising medication need a separate, more conservative conversation with a doctor.
FAQ
What SPF do I actually need in Fiji?
For most fair-skinned travellers at midday in the dry season on open beach: SPF 50+ reapplied every 2 hours. A rashie and a broad-brim hat reduces that requirement to SPF 30 for face/neck only. The trap is forgetting ears, the back of the neck, and the tops of feet.
Is the August sun really worse than January?
No. January has the steepest sun (UV peaks 13–14 typical). August has thinner ozone over the South Pacific (UV 9–11 typical at midday). They feel similar because both are well above the "extreme" threshold, but the peak UV happens around the calendar summer.
Do I need reef-safe sunscreen?
Yes. Oxybenzone (benzophenone-3) and octinoxate damage coral larvae even at very low concentrations. Mineral filters (zinc oxide, non-nano titanium dioxide) are the right choice. Fiji has banned some oxybenzone products in marine parks; this is a regulatory trend across the Pacific.
Does being underwater protect you from UV?
Yes — water absorbs UV, and at 1 m depth the effective UV is roughly halved. At 3 m it's negligible. But your face and back are still exposed at the surface when you look up, and that's where most snorkel-burns happen. A rashie or stinger suit fixes this.
What about kids?
Under 6 months: keep out of direct sun, no sunscreen. 6 months to 3 years: zinc-oxide stick SPF 50+ on face, rashie, hat, shade. Older kids: same as adults but more frequent re-application. Fiji schools use a "no hat no play" rule and a UV-graded break schedule from 11am to 2pm.
- • WHO Global Solar UV Index — A Practical Guide (ICNIRP-aligned)
- • Australian Radiation Protection and Nuclear Safety Agency (ARPANSA) UV model
- • Fiji Meteorological Service daily UV forecast
- • NIWA (NZ) South Pacific ozone climatology
- • Reef-World Foundation Australia reef-snorkel sun briefing
- • Fiji Ministry of Health sun-safety pamphlet