UV Index Today

Real-time solar radiation monitoring

St. Louis, Missouri, United States
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St. Louis

Missouri, United States • Local time: 11:22

Live UV Index
11:00
3.2
Moderate
Peak 4.5 at 13:00

Temp

20.7°C
Sunny

Status

Sunny

Max

24.4°C

Next 3 Hours

4.2
12:00
4.5
13:00
4.4
14:00

Humidity

45%

Cloud

0%

Wind Spd

5.7km/h

"Moderate risk. Seek shade near midday."

Today's UV Forecast

Hourly prediction for St. Louis · Peak 4.5 at 13:00

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00
—
01
—
02
—
03
—
04
—
05
—
06
—
07
0.1
08
0.8
09
2.0
10
3.2
11
4.2
12
4.5
13
4.4
14
3.7
15
2.6
16
1.4
17
0.3
18
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19
—
20
—
21
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22
—
23

Sunburn time at UV 3.2

Estimate for St. Louis based on your skin type. Estimates only — not medical advice.

Skin type (Fitzpatrick)

Unprotected

31 min

Type II · no sunscreen

Recommended

SPF 50

Moderate UV with fair skin — use broad-spectrum SPF 50 and seek shade near midday.

With SPF 50

12+ hours

Theoretical window — apply enough and reapply every 2 hours

Quick take: Moderate unprotected window — still use SPF for midday outdoor time.

Open full calculator with SPF options

Location Map

38.6227, -90.2129 · Elev. 140 m · America/Chicago

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Today's UV outlook for St. Louis

Today's forecast for St. Louis peaks at UV 4.5 around 13:00. The hourly outlook shows 5 hours at moderate or above (UV 3+). The live reading is UV 3.2 right now.

UV stays mostly in the low-to-moderate range today, but the hourly bars still show when exposure climbs. Fair skin still benefits from SPF for extended time outdoors.

Compare with other cities in Missouri, or read practical planning notes in the blog .