Portugal UV Index by Month: At a Glance
Portugal's southern coast has a near-Mediterranean climate with one of the highest summer UV totals in Western Europe. The Algarve, Madeira and the Lisbon region routinely peak at UV 10 in July and August, making the shoulder months an obvious win for sun-sensitive travellers.
This guide uses live and historical UV data from specialized UV monitoring services and public weather data sources, cross-referenced with WHO UV Index thresholds, to show you exactly when burn risk is highest and lowest in Portugal.
Monthly UV Averages for Portugal
The table below shows average peak UV index by month for Portugal, the WHO risk category, and the typical burn time for Fitzpatrick skin type II (fair skin, light hair) with no protection at solar noon.
| Month | Avg Peak UV | Risk Level | Burn Time (Skin Type II) |
|---|---|---|---|
| January | 2 | Low | 34 min |
| February | 3 | Moderate | 22 min |
| March | 5 | Moderate | 13 min |
| April | 7 | High | 10 min |
| May | 9 | Very High | 7 min |
| June | 10 | Very High | 7 min |
| July | 10 | Very High | 7 min |
| August | 9 | Very High | 7 min |
| September | 7 | High | 10 min |
| October | 5 | Moderate | 13 min |
| November | 3 | Moderate | 22 min |
| December | 2 | Low | 34 min |
Use these numbers as a planning baseline. For live, location-specific UV at any time of day, check the Portugal UV index page on Daily UV Tracker — it pulls real-time data and adjusts burn time for your skin type.
Best Months to Visit Portugal for Sun Safety
The best months to visit Portugal from a UV-safety standpoint are April to May and September to October. During this window, shoulder months give the Algarve and Lisbon coast UV 5–7 with comfortable temperatures and far smaller crowds. UV bottoms out around 2 in January, which classifies as low risk under WHO guidelines.
For most travellers — particularly those with Fitzpatrick I, II or III skin types — these months allow for longer outdoor windows with conventional SPF 30 protection, fewer mid-afternoon retreats indoors, and a far lower risk of trip-ending sunburn. They also tend to coincide with shoulder-season pricing in Portugal, making them a smart pick for budget-conscious travellers as well as sun-sensitive ones.
That said, shoulder months in the Mediterranean still produce UV 6–8 at midday, which means SPF 30 and a hat are still essential. Use the burn time calculator to see what your skin can actually handle on any given day.
Worst Months to Visit Portugal for Sun Safety
The worst months to visit Portugal for UV safety are June to August. These are the months when the Algarve, Madeira and southern Portugal climb to UV 10 — combine that with Atlantic reflection on white-sand beaches and burn times collapse. UV peaks at 10 in June, which sits firmly in the very high risk band on the WHO scale.
For Fitzpatrick I and II skin types, unprotected burn times in June can drop to 7 min or less at solar noon. For darker skin types (IV–VI), the visible burn risk is lower, but DNA-level UV damage and long-term skin cancer risk remain significant — UV 11+ is genuinely dangerous regardless of skin tone.
If you must travel to Portugal during these months, the safest pattern is to:
- Plan outdoor activities for the first three hours after sunrise, when UV is still climbing.
- Treat 10am to 4pm as a strict shade-or-indoors window unless wearing UPF clothing.
- Layer mineral SPF 30+ with a wide-brim hat and wraparound sunglasses.
- Reapply sunscreen every 90 minutes, not the standard two hours, in extreme UV environments.
- Check the live UV forecast every morning — afternoon clouds can hide UV 11 conditions.
See our full tropical sun safety guide for more on this pattern.
Month-by-Month Breakdown for Portugal
Below is a quick read of what to expect each month in Portugal, ordered by season:
Peak UV: June (UV 10)
This is the most dangerous month for unprotected sun exposure in Portugal. Treat every outdoor activity as a high-risk burn window and consider rescheduling beach days for early morning or late afternoon.
Lowest UV: January (UV 2)
This is the safest month to be outdoors in Portugal. UV is officially low risk — most adults can be outside safely without sunscreen for short periods, though sunglasses are still recommended.
Shoulder months
The transition months — typically the period either side of June — give you most of the climate benefits of peak season with substantially lower UV. Look closely at the table above to find the sweet spot for your trip.
How Portugal Compares to Other Destinations
Portugal sits in the Europe region with a mediterranean climate. Compared to other popular destinations:
- Porto, Faro, Funchal — nearby cities with similar UV profiles to Portugal.
- Bali and the Maldives — equatorial benchmarks at UV 11–12 year-round.
- Sydney and Perth — Southern Hemisphere extremes with thinner ozone.
- All destinations — full directory of UV profiles.
For a structured month-by-month view across countries, see our destinations by month hub.
Frequently Asked Questions
What is the UV index in Portugal right now?
Live UV in Portugal changes hour by hour and varies by exact location. Check the Portugal live UV page for the current reading and a 16-day forecast.
When is Portugal safest for fair skin?
Portugal is safest for Fitzpatrick I–III skin types during April to May and September to October, when peak UV drops to 2–6. Even then, SPF 30, a hat and shade between 11am and 3pm are recommended.
What month has the highest UV index in Portugal?
June typically records the highest UV in Portugal, averaging UV 10 at solar noon. This corresponds to the WHO very high risk category.
Is Portugal safe to visit during the worst UV months?
Yes — millions of people visit Portugal during June–August every year. The risk is manageable with disciplined sun protection: avoid midday sun, wear UPF clothing, and reapply SPF 30+ every 90 minutes.
How does Portugal's UV compare to home?
For most travellers from northern Europe, the UK or the northern US, Portugal's peak UV (10) is two to three times higher than what you experience at home in summer. Burn times can be a fraction of what you're used to.
Sources and Methodology
UV averages in this guide are derived from:
- Specialized UV monitoring services — global real-time UV index data, used for current and forecast UV on Daily UV Tracker.
- Public weather data sources — historical hourly UV and weather data spanning multiple years per location.
- WHO UV Index reference — risk categorisation thresholds.
- US EPA UV Index Scale — burn time guidance by skin type.
Burn times shown for skin type II use the standard 67 minutes ÷ UV formula and assume no sunscreen, no clothing and clear-sky conditions at solar noon. Real-world burn times vary substantially with altitude, water reflection, ozone and individual skin response — always cross-reference the live Portugal UV forecast and the burn time calculator before any extended outdoor activity.
Key Takeaways
- The best months to visit Portugal for UV safety are April to May and September to October, when UV averages 2–6.
- The worst months are June to August, when UV climbs to 10 in June.
- Northern Hemisphere summer (Jun–Aug) is the peak UV window.
- Always check the live Portugal UV index before planning outdoor activity, and adjust your protection accordingly.
- Combine the monthly averages above with the personalised burn time calculator for the most accurate planning.