DermUV
UV Index
Los Angeles, CA
Los Angeles Coastal UV, Live Reading & Forecast
Live UV for Los Angeles is shown above and updates each minute. Los Angeles combines a 34-degree latitude with Pacific marine layers that often hide dangerously high UV behind a feeling of cool, hazy air. The city is currently in summer, when local UV typically reaches the very high band at noon.
Los Angeles UV by Month
Average UV in Los Angeles peaks during May, Jun, Jul, when high sun angles combine with longer days. The deceptive months are usually early spring and early fall, when air temperatures stay mild but UV climbs into the high category by mid-morning. Locals often skip sunscreen on cool, overcast days, which is exactly when UV-A continues to drive long-term skin damage. UV in Los Angeles is lowest during Jan, Dec.
| Month | Avg UV | Risk |
|---|---|---|
| Jan | 5.9 | Moderate |
| Feb | 7.4 | High |
| Mar | 9.2 | Very High |
| Apr | 10.8 | Very High |
| May | 11.7 | Extreme |
| Jun | 12.0 | Extreme |
| Jul | 11.9 | Extreme |
| Aug | 11.3 | Extreme |
| Sep | 9.9 | Very High |
| Oct | 8.0 | Very High |
| Nov | 6.3 | High |
| Dec | 5.5 | Moderate |
Reading the UV Index, From 1 to 11+
The UV index runs from 1 to 11 and above. A reading of 1 to 2 is low and most people need no protection. From 3 to 5 you should cover up or use SPF. Anything above 6 is high or extreme, which means unprotected fair skin can begin reddening in well under 30 minutes. On a typical summer afternoon in Los Angeles, the reading sits around 12, which puts everyone outside the extreme risk band. Your skin type matters too: your skin type determines how quickly you burn at any given UV. Kids playing outside for an hour at UV 6 with a hat and SPF 30 are well protected, so this is manageable with simple habits.
SPF Guidance for Los Angeles Residents
At UV 3 to 5, SPF 15 broad-spectrum is the baseline. At UV 6 to 7, move to SPF 30. From 8 upward, SPF 30 plus a hat and sunglasses become the standard combination, with SPF 50 for extended outdoor time. One Los Angeles-specific point: water and wet sand reflect 15 to 25 percent of UV back up onto your face, so the underside of your jaw and chin burn faster than your shoulders. Reapply every two hours of direct sun and after swimming. One counterintuitive fact: car and home windows block UV-B but most pass UV-A, which still ages skin over time. Source: EPA SunWise.
Building Everyday Sun Habits in Los Angeles
Sun exposure adds up over a lifetime, so what you do in Los Angeles on ordinary days matters more than any single beach trip. The habits that make the biggest difference are boring on purpose: broad-spectrum SPF 30 on face and hands every morning, a hat and sunglasses whenever the UV reads 6 or higher, and shade or timing shifts around the 11am to 2pm peak. Kids burn faster than adults, and one severe childhood sunburn can double lifetime UV-related skin damage. This information is educational only. For personal skin questions, talk to a qualified health professional.
Los Angeles UV FAQ
what is the uv index in los angeles right now
The live UV index for Los Angeles, CA on this page updates every minute from atmospheric model data. During summer, typical Los Angeles UV runs between 5 and 12. The number above this page reflects current cloud cover, time of day, and sun angle. Refresh once or twice if you just stepped outside.
what time of day is uv highest in los angeles
UV in Los Angeles peaks between roughly 11am and 2pm local time, with the absolute maximum near solar noon. In summer, that window shifts slightly because the sun rises and sets at different times. Cloud cover can shave a few points off the peak but rarely flattens it. Plan high-effort outdoor activity for before 10am or after 3pm if you want to keep exposure low.
do i need sunscreen in los angeles today
If the live UV index above this page reads 3 or higher, yes. Below 3, daily SPF 15 is a sensible baseline for routine exposure. Los Angeles sees May, Jun, Jul as its highest UV stretch, when SPF 30 broad-spectrum is the minimum most guides suggest. Cloudy days still let through 80 percent of UV-A, which drives long-term aging.
is uv dangerous in los angeles in summer
Yes. Summer UV in Los Angeles reaches around 12 at its peak, well into the very high or extreme category on the WHO scale. Unprotected fair skin can begin reddening in 15 to 25 minutes at that level. Sunglasses, SPF 30 or higher, and a wide-brim hat are the standard combination.
does water reflection raise uv at los angeles beaches
Yes, significantly. Open water and wet sand reflect 15 to 25 percent of incoming UV back up onto exposed skin, which means your face and the underside of your jaw take a hit even when you are wearing a hat. Beach umbrellas block direct sun but not reflected UV. Reapply sunscreen every 80 minutes when swimming.
How Fast Skin Burns in Los Angeles at Peak UV
These estimates use the standard erythemal dose formula for the Fitzpatrick scale at the peak summer UV of about 12 in Los Angeles. Numbers are unprotected, direct-sun exposure to the point where fair skin begins visibly reddening (Minimal Erythemal Dose). SPF 30 multiplies each row by roughly 20 to 25 when applied at the labeled 2 mg per square centimeter density. Most people apply about half, so real-world protection is closer to a 12x multiplier.
| Skin type | Description | Unprotected minutes at UV 12 | With SPF 30 (realistic) |
|---|---|---|---|
| Type I | Very fair, always burns | 6 min | 67 min |
| Type II | Fair, usually burns | 8 min | 100 min |
| Type III | Light olive, sometimes burns | 17 min | 200 min |
| Type IV | Mediterranean, rarely burns | 25 min | 300 min |
| Type V | Brown, very rarely burns | 42 min | 500 min |
| Type VI | Deeply pigmented, does not burn | 67 min | 800 min |
Not sure which type you are? Use our Fitzpatrick self-assessment or the sunburn-time calculator for a personalized estimate at today's live UV.
Timing Outdoor Life Around Los Angeles UV
Most burns in Los Angeles happen not because the UV was surprising but because the timing was wrong. The chart above shows peak UV between 11am and 2pm. Serious outdoor effort in that window at 12 UV puts skin under continuous, intense UV load.
- Running & cycling: Aim for pre-8am or post-5pm. Sweat washes off sunscreen fast, so choose a sport-labeled SPF 50 water-resistant formula and reapply every 60 minutes if you're out longer.
- Golf: A four-hour round covers the entire peak UV window. Long-sleeve UPF polos, wide-brim hats, and SPF stick reapplication between holes cut effective UV by more than 90 percent versus a T-shirt and one morning application.
- Beach & swimming: Water reflection adds 15 to 25 percent to your dose. Reapply after every swim, not just every two hours. UPF rash guards protect shoulders and back better than any SPF.
- Kids & playgrounds: Under-six skin has thinner stratum corneum and burns faster. Schedule park visits before 10am or after 4pm, especially during May, Jun, Jul.
- Dog walking & commuting: Cumulative "incidental" UV drives most photoaging in Los Angeles. Daily facial SPF 30 handles the small doses your skin actually collects.
Los Angeles Sun-Safety Myths That Cost People Skin
Sun-safety advisors in Los Angeles see the same five misconceptions on repeat. Each one is common enough to shape how quickly people burn.
- "It's cloudy, so I don't need sunscreen." Thin cloud passes roughly 70 to 90 percent of UV. UVA passes through almost fully. Overcast summer days in Los Angeles still hit UV 6 or higher.
- "The umbrella covers me at the beach." Beach umbrellas block direct sun but reflected UV from sand and water still delivers 30 to 50 percent of your face-level dose.
- "A base tan protects me for summer." A tan delivers an estimated SPF of 2 to 4. The DNA damage required to build one is permanent; the "protection" is not.
- "I have darker skin so I don't burn." Fitzpatrick V and VI burn less easily but still accumulate UV damage, and sun-related lesions on palms, soles, and nail beds are often missed because they aren't UV-driven.
- "Higher SPF is a linear jump." SPF 30 blocks 97 percent of UVB, SPF 50 blocks 98 percent. The real difference is that SPF 50 tolerates under-application better, which matters because most people use half the tested amount.
Los Angeles Sun-Safe Wardrobe Guide
Clothing is the highest-leverage sun protection because it never washes off. A UPF 50 shirt blocks 98 percent of UV for 0 minutes of effort, versus a white cotton T-shirt which sits closer to UPF 5 when dry and drops to UPF 3 wet. In Los Angeles, where peak UV reaches 12, that difference is the gap between a comfortable day and a red-shoulders evening.
- Shirt: UPF 50 long-sleeve in light color, tightly-woven synthetic or merino. Avoid loose weaves like linen for peak-UV hours.
- Hat: Minimum 3-inch brim, all the way around. Baseball caps miss ears and neck, two of the areas most easily sun-damaged.
- Sunglasses: Category-3 or category-4 lenses labeled UV400. Wraparound frames block reflected UV from below, which matters near water, sand, or concrete.
- Sunscreen: Broad-spectrum SPF 30 or higher, applied 15 minutes before exposure at roughly a nickel for the face and a shot glass for the body. Reapply every 2 hours outdoors.
- Lips: SPF 30 lip balm. The lower lip is almost never protected and burns faster than most other facial skin.
Vitamin D in Los Angeles
Los Angeles sits at 34 degrees latitude, which controls how much UVB reaches the ground and therefore how much vitamin D your skin can synthesize. Los Angeles produces enough UVB year-round for casual vitamin D synthesis. For Fitzpatrick II-III skin, roughly 10 to 15 minutes of arms-and-legs exposure a few times a week at UV 3 or higher is generally sufficient. Darker skin needs 3 to 6 times longer. Many experts favor getting vitamin D from diet and supplements rather than deliberate sun exposure, because the trade-off in accumulated UV damage is usually not worth the added D.
More UV Data for Los Angeles
Monthly UV index in Los Angeles, CA shows the seasonal pattern by month.
See UV index across California for nearby cities in the same state.
UV Index in Nearby Cities
How to read this UV Index Los Angeles, CA page
The UV index is a measure of erythemal (skin-reddening) irradiance, where each whole point equals 25 mW/m² of UV energy reaching the surface. That is why burn-time estimates fall roughly by half when the index doubles.
UV strength on this page follows solar elevation, ozone thickness, cloud cover, altitude, and surface reflection. Snow can bounce back most of the UV that hits it, water and sand far less, but all of them add to the dose skin receives.
Plan outdoor blocks around the peak UV window, usually between 10am and 4pm local time. Shade, UPF fabric, a wide-brim hat, and UV-blocking sunglasses reduce dose more reliably than sunscreen alone.
Cloud cover is not protection. Thin or broken cloud can still pass most incoming UV, and light cloud edges can briefly scatter more UV toward the ground than a clear sky.
Cumulative dose drives photoaging and long-term skin damage more than any single day. Small daily exposures on commutes, walks, and driving add up across a season.
UV scale reference
The WHO scale groups UV 1-2 as low, 3-5 as moderate, 6-7 as high, 8-10 as very high, and 11 or above as extreme. Protection is recommended from UV 3 upward, and shade during the middle of the day becomes the priority from UV 8 upward.
A practical routine at moderate-to-high UV is roughly one ounce of broad-spectrum sunscreen for full-body coverage, applied 15 minutes before going out, then reapplied on schedule. Clothing, hats, and shade carry the rest of the load, especially for children and anyone with a history of easy burning.
Keep exploring DermUV
These pages give more depth around uv index los angeles, ca, from UV-scale reference material to calculators and city forecasts.
- Sunburn time calculator
- UV learning center
- Vitamin D sun calculator
- SPF reapply timer
- spf math lesson
- What UV index 8 means
- uv damage lesson
- What UV index 11 means
- What UV index 5 means
DermUV forecast values come from Open-Meteo UV data (CC BY 4.0) and are refreshed throughout the day.