How long can you tan in UV 9?
At UV 9, skin type II reaches the first redness in about 19 min with no sunscreen, and about 9 h 16 with SPF 30. Type I has 15 min; type VI has 44 min. UV 9 is in the very high band (8–10).
Tropical and subtropical summer, the Australian east coast from November to February, and anywhere above 1,500 m in clear summer air.
Today in Columbus
UV 0 right now (low) · peak UV 8.6 at 14:00 · skin type II window 11:07–11:35 and 16:36–17:49
- 14:00 Peak UV hour
- 19 min Time to redness at peak, type II
- 11:07–11:35 First of 2 windows
- 11:20–17:13 Protection recommended (UV 3+, WHO)
Burn times at UV 9, by skin type and SPF
| Skin type | No SPF | SPF 15 | SPF 30 | SPF 50 |
|---|---|---|---|---|
| I — Always burns, never tans. | 15 min | 3 h 42 | 7 h 24 | 12 h 21 |
| II — Burns easily, tans minimally. | 19 min | 4 h 38 | 9 h 16 | 15 h 26 |
| III — Burns moderately, tans gradually. | 22 min | 5 h 33 | 11 h 07 | 18 h 31 |
| IV — Burns rarely, tans easily. | 30 min | 7 h 24 | 14 h 49 | over 24 h |
| V — Burns very rarely, tans very easily. | 37 min | 9 h 16 | 18 h 31 | over 24 h |
| VI — Almost never burns, always tans. | 44 min | 11 h 07 | 22 h 13 | over 24 h |
Every figure is 0.667 × MED ÷ UV, the standard erythemal formula. The MED values are
the published Fitzpatrick doses: 200 to 600 J/m² from type I to type VI. See the full method.
What UV 9 actually means
At UV 9 the burn times compress hard: 15 minutes for type I, 19 for type II, 22 for type III. Reflection matters more than at any lower level — dry sand adds about 15% and water alongside you adds about 20%, which turns a 19-minute limit into 15.
What to do: Shade between 10:00 and 16:00. If you are on sand or beside water, subtract a fifth from every number on this page.
Official guidance for the very high band (8–10): Extra protection. Avoid the sun between 11:00 and 15:00.
UV 9 with sunscreen
Your skin type at UV 9
- Type I — 15 min Always burns, never tans. Limit: UV 3.3.
- Type II — 19 min Burns easily, tans minimally. Limit: UV 4.2.
- Type III — 22 min Burns moderately, tans gradually. Limit: UV 5.
- Type IV — 30 min Burns rarely, tans easily. Limit: UV 6.7.
- Type V — 37 min Burns very rarely, tans very easily. Limit: UV 8.3.
- Type VI — 44 min Almost never burns, always tans. Limit: UV 10.
Where the sun is strongest right now
Nowhere we track peaks at exactly UV 9 on its current forecast day. Here is where the sun is strongest instead.
- Brighton — UV 6.5High · United Kingdom · peak at 13:00 · type II window 10:00–10:22
- Bristol — UV 6.3High · United Kingdom · peak at 13:00 · type II window 11:17–12:12
- Cardiff — UV 5.8High · United Kingdom · peak at 13:00 · type II window 11:17–12:18
UV 9 — the questions people actually ask
How long can you stay in UV 9 without burning?
At UV 9, unprotected skin reaches the first visible redness after about 15 min for Fitzpatrick type I, 19 min for type II, 22 min for type III and 44 min for type VI. Those figures assume a clear sky, sea level, and no reflective surface.
Is UV 9 strong enough to tan?
Yes. UV 9 is in the very high band, well above the UV 2 threshold where skin starts producing melanin. The constraint at UV 9 is not whether you can tan, it is how long before you cross into a burn — 19 min for type II.
How long can you stay in UV 9 with SPF 30?
SPF 30 multiplies the unprotected time by 30 in laboratory conditions, so type II goes from about 19 min to about 9 h 16 at UV 9. Real-world protection is usually lower because most people apply about a quarter of the tested amount, and because sunscreen comes off with water and towels.
Does cloud cover change how long you can tan at UV 9?
Less than people expect. A completely overcast sky cuts UV 9 to roughly UV 2.3; a half-covered sky cuts it by about 7%. That is why sunburn on a grey day is common — the heat drops far more than the UV does.
What is the safe UV limit for my skin type?
UV Hour uses one rule: stay below the UV level that leaves at least 40 minutes before the first redness. That gives UV 3.3 for type I, UV 4.2 for type II, UV 5 for type III and UV 10 for type VI. At UV 9, types VI still do.