UV Index Today
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Why UV Index Matters for Skincare
The UV index measures the intensity of ultraviolet radiation reaching the surface at a given time and location. A UV index of 3 or above is enough to cause skin damage with prolonged unprotected exposure. Across most of Southeast Asia, UV levels regularly reach 10 or above, classified as extreme, even on overcast days when cloud cover filters only a fraction of UV radiation.
SPF and the UV Index
SPF 50 filters about 98 percent of UVB rays under standard test conditions, but real-world protection depends on application amount and reapplication timing. Dermatological guidance recommends reapplying sunscreen every two hours during outdoor exposure, and more frequently if you are sweating or swimming. On high UV index days, protective clothing and shade between 10am and 4pm meaningfully reduce cumulative exposure.
PA Rating and UVA
The UV index primarily reflects UVB intensity, the rays most linked to sunburn. UVA rays, which penetrate more deeply and contribute to pigmentation and skin ageing, are present at relatively consistent levels throughout daylight hours regardless of UV index. Look for sunscreens carrying a PA+++ or PA++++ rating alongside SPF, particularly common in Japanese and Korean formulations, for broad-spectrum UVA protection.
Building the Habit
Consistent daily sunscreen use is the single most evidence-supported habit for preventing UV-related skin damage and hyperpigmentation. The daily UV advisory and streak tracker on this page are designed to make checking and applying sunscreen part of a consistent morning routine. Use the SPF Calculator to work out the right amount for your face and body.
How the Daily Tracker Works
The tracker records what you actually did rather than what you intended to do. Each day you mark off the steps you completed, note anything new you introduced, and flag how your skin felt. Everything is stored in your own browser rather than on a server, so there is no account and nothing is uploaded. Clearing your browser data will clear the log.
The value is not the daily tick. It is the record you can look back through when something changes. If your skin flares in week three, a log that shows you introduced an exfoliant on day fifteen answers the question immediately, where memory usually cannot. Note products by name rather than category, since two cleansers are rarely equivalent.
Why Consistency Matters More Than Intensity
Skin responds to repetition on its own timescale. Barrier repair takes two to four weeks of consistent gentle care, and research on barrier disruption describes how a disrupted barrier raises water loss and reactivity, which is the mechanism behind most of the tightness, stinging and redness people try to treat with more products. Adding steps to a compromised barrier usually extends the problem.
A three-step routine performed nightly outperforms an eight-step routine performed twice a week, and the tracker exists to make that visible. Look at your completion rate across a fortnight rather than any single day, and treat a missed day as data rather than failure. If the log shows you consistently skip the same step, that step is probably too slow, too uncomfortable, or unnecessary.
Frequently Asked Questions
What does the daily tracker record?
The steps you completed each day, anything new you introduced, and how your skin felt. It is a record of what you actually did rather than what you planned, which is what makes it useful when something changes unexpectedly.
Where is my tracking data stored?
Entirely in your own browser on the device you are using. Nothing is uploaded and there is no account to create. Clearing your browser data deletes the log, so treat it as a local record rather than permanent storage.
Why does consistency matter more than the number of steps?
Because skin responds to repetition over weeks. Barrier repair takes two to four weeks of consistent gentle care, and a three-step routine done nightly outperforms an eight-step routine done twice a week. Adding steps to a compromised barrier usually prolongs the problem.
How should I use the log when my skin flares?
Look back for what changed in the two weeks before the flare. A log showing you introduced an exfoliant on a specific date answers immediately what memory usually cannot. This is why noting products by name rather than category matters.
Is missing a day a problem?
No. Treat it as data rather than failure. What matters is the completion rate across a fortnight, not any single day. If the log shows you consistently skip the same step, that step is probably too slow or unnecessary for you.