UV index for Surabaya peaks at UV 11 at 11:00 local time. Data as of (Asia/Jakarta). Values update hourly — see this page for the current reading and hourly forecast.

uvi·today

UV Index in Surabaya

Live UV index for Surabaya, Indonesia — current level, hourly UV forecast, peak times, WHO sun protection advice and a 5-day outlook. Now: UV 1 (Low). Peak today: UV 11 at 11:00.

Now · 16:00 · Surabaya
1
Low
0–2Low3–5Moderate6–7High8–10Very High11+Extreme

Sun protection needed today: 08:00–15:00

Protection guidelines:

Now · 16:00 — UV 1 · Low · Clear sky: 1

  • No protection needed
  • You can safely enjoy being outside
Values are forecasts from the European CAMS model (Copernicus), not measurements from a sensor in Surabaya. WHO · Methodology
Today's UV overview · Fri, Oct 16
2
7Mainly clear27°80%1
4
8Mainly clear29°72%1
7
9Mainly clear31°61%2
9
10Clear sky33°48%3
11
11Clear sky34°42%4
10
12Clear sky34°40%4
8
13Clear sky35°41%5
5
14Mainly clear35°40%5
2
15Partly cloudy35°39%5
1
16Mainly clear35°39%4
% HumidityWind m/s
Max today
11at 11:00
Max tomorrow
12at 11:00
Daylight today
12h 16m05:06–17:22
Solar noon
11:14

Sun & moon in Surabaya

Sun height18°
Sun directionW 263°
Sky stateDaylight
-90°-60°-30°0°30°60°90°00:0006:0012:0018:0024:00Now 18°

The curve traces the sun's height above the horizon through the day: 0° is the horizon, 90° is straight overhead. The higher the sun climbs, the shorter the path its rays take through the atmosphere — and the stronger the UV. The part below 0° is night.

Sunrise / sunset directionE 99° / W 261°
Civil twilight04:45–05:06 / 17:22–17:43
Nautical twilight04:21–04:45 / 17:43–18:08
Astronomical twilight03:56–04:21 / 18:08–18:32
Moon phaseWaxing crescent · 29%
Moonrise / moonset09:11 / 22:08
Next moon quarterFirst quarter · Oct 18, 23:13

Detailed hourly UV index — Today, Oct 16

Peak UV 10.6 at 11:00 · Surabaya · Local time (GMT+7)

The solid line is the hourly UV forecast: the UV index expected each hour, with cloud cover taken into account. The dashed line is the clear-sky UV, the level it would reach under a cloudless sky. The gap between the two lines shows how much the clouds are lowering the UV.

04812Max: 11Now: 16:0026°9:0031°12:0034°15:0035°18:0031°21:0029°
ForecastClear sky

Detailed hourly UV index — Tomorrow, Oct 17

Peak UV 11.9 at 11:00 · Surabaya · Local time (GMT+7)

04812Max: 126:0026°9:0031°12:0034°15:0035°18:0031°21:0029°
ForecastClear sky
Hour-by-hour UV index for today & tomorrow

Detailed hour-by-hour UV index forecast for Surabaya — today and tomorrow. Includes UV level, clear-sky UV, weather conditions, and temperature for each hour.

Today — Oct 16

HourUVClear skyWeather
05:000.0 – Low0.0Mainly clear27°
06:000.4 – Low0.4Mainly clear26°
07:001.8 – Low1.8Mainly clear27°
08:004.4 – Moderate4.4Mainly clear29°
09:007.4 – High7.5Mainly clear31°
10:009.1 – Very High10.0Clear sky33°
11:0010.6 – Extreme11.3Clear sky34°
12:009.8 – Very High10.8Clear sky34°
13:008.3 – Very High8.6Clear sky35°
14:005.4 – Moderate5.4Mainly clear35°
15:002.5 – Low2.5Partly cloudy35°
16:000.7 – Low0.7Mainly clear35°
17:000.1 – Low0.1Clear sky33°
18:000.0 – Low0.0Clear sky31°
19:000.0 – Low0.0Clear sky30°
20:000.0 – Low0.0Clear sky29°
21:000.0 – Low0.0Clear sky29°

Tomorrow — Oct 17

HourUVClear skyWeather
05:000.0 – Low0.0Partly cloudy26°
06:000.5 – Low0.5Mainly clear26°
07:002.0 – Low2.0Mainly clear28°
08:004.8 – Moderate4.8Mainly clear29°
09:008.2 – Very High8.2Mainly clear31°
10:0010.9 – Extreme10.9Clear sky33°
11:0011.9 – Extreme11.9Clear sky34°
12:0011.0 – Extreme11.0Clear sky34°
13:008.5 – Very High8.5Clear sky35°
14:005.2 – Moderate5.2Clear sky35°
15:002.3 – Low2.3Clear sky35°
16:000.6 – Low0.6Clear sky35°
17:000.1 – Low0.1Clear sky33°
18:000.0 – Low0.0Mainly clear31°
19:000.0 – Low0.0Mainly clear30°
20:000.0 – Low0.0Partly cloudy29°
21:000.0 – Low0.0Partly cloudy29°

5-Day UV Forecast for Surabaya

The 5-day UV index forecast shows each day's peak UV and the time it's reached, plus daily high and low temperatures and an hourly UV curve, so you can plan sun protection for the days ahead.

Today, Oct 16Peak UV 11 at 11:00Sun protection: 08:00–15:0035° / 26°
6Mainly clear26°9Mainly clear31°12Clear sky34°15Partly cloudy35°18Clear sky31°
Saturday, Oct 17Peak UV 12 at 11:00Sun protection: 08:00–15:0035° / 26°
6Mainly clear26°9Mainly clear31°12Clear sky34°15Clear sky35°18Mainly clear31°
Sunday, Oct 18Peak UV 10 at 11:00Sun protection: 08:00–15:0034° / 27°
6Mainly clear27°9Mainly clear31°12Mainly clear34°15Mainly clear34°18Clear sky30°
Monday, Oct 19Peak UV 9 at 11:00Sun protection: 08:00–15:0035° / 27°
6Partly cloudy27°9Partly cloudy31°12Clear sky34°15Mainly clear35°18Clear sky31°
Tuesday, Oct 20Peak UV 9 at 11:0036° / 27°
6Mainly clear27°9Mainly clear31°12Clear sky35°15Clear sky35°18Mainly clear32°

Peak midday UV by month in Surabaya

It's October: on clear days, the midday sun here usually peaks around UV 13–15. That's very intense: around midday you need shade, covering clothes and sunscreen.

The sun is strong here all year round: even in the mildest months, midday UV reaches about 11, so protection is needed in every season. Treat these numbers as the most sun you should expect around noon: clouds typically lower the real value, while reflections from snow, sand or water can add to the UV your skin actually receives. Today's actual UV is in the forecast above.

36811141713–15Jan14–16Feb13–16Mar12–15Apr9–12May9–11Jun9–11Jul11–13Aug12–15Sep13–15Oct13–15Nov13–14Dec

Each bar shows the range the midday UV index moves through on clear days in that month, from the gentlest days up to what the strongest days typically reach, based on 17 years of satellite data (2004–2020). The small light line inside a bar is an ordinary day's midday level.

Based on TEMIS data. Copyright © KNMI/ESA — https://www.temis.nl/

In October the strong sun is in the southern hemisphere: UV reaches high levels across most of it, while the northern hemisphere outside the tropics has its mild season.

See the world map for October →

The UV year at a glance

Strongest sunFeb–Mar · up to 16
Weakest sunJun–Jul · up to 11
Protection needed (UV 3+)all year
Extra protection (UV 8+)all year

Months when the midday sun gets strong enough to need protection. Based on clear days; clouds typically lower UV.

See also: Surabaya temperature and rainfall by month →

UV in Surabaya: today, tomorrow and through the year

In Surabaya the UV index has dropped back to 1 (low), down from the day's high of 11 (extreme) around 11:00. Skies stayed clear today, letting the sun through at close to full strength.UV strengthens tomorrow, topping out at UV 12 (extreme) near 11:00, with protection needed from 08:00 to 15:00.Across the year, October sits near the top of the UV range in Surabaya: its strongest days reach about UV 15, and even the quietest months stay around UV 11.

Location, daylight and sky in Surabaya

Key facts

CountryIndonesia, East Java
TimezoneAsia/Jakarta (UTC+7)
Coordinates7.25° S, 112.75° E
Elevation10 m
Population≈ 3.02M
Air pressurebarometer.today

Sun & Daylight Hours in Surabaya

Sunrise / sunset05:06 / 17:22
Daylight today12h 16m
Daylight tomorrow12h 16m (±0 min)
Solar noon (sun highest)11:14
Golden hour16:54–17:35
Low UV hours (UV < 3)05:00–08:00
15:00–17:00
High UV window (UV ≥ 3)08:00–15:00

Seasonal daylight range at this latitude

Longest day12h 33m (Dec 21)
Shortest day11h 42m (Jun 21)

Similar daylight hours as Dar es Salaam, Tanzania — on the same parallel

UV index map for Surabaya and nearby cities

This map shows the current UV forecast for Surabaya and the area around it. One forecast value covers a region of roughly 40 km, so it is a good guide for the area as a whole rather than an exact reading for one spot. In places with big height differences, or where the ground is covered by snow, the real UV can differ from what the map shows.

Check UV in: Kediri · Singosari · Probolinggo · Batu · Blitar

Air quality concerns? Check air quality in Surabaya on AirIndex.Today

What is the UV index in Surabaya right now?

As of 16:00 local time, the UV index in Surabaya is 1 (Low). UV changes hour by hour. See the hourly chart above for how it rises and falls today.

What is the UV index in Surabaya today?

On 2026-10-16, the peak UV index forecast for Surabaya is 11, expected around 11:00 local time. Check back daily: UV levels change with cloud cover, ozone, and sun angle.

What is the UV index in Surabaya tomorrow?

On 2026-10-17, the UV index in Surabaya is forecast to peak at 12 around 11:00 local time. Plan outdoor activities and sun protection around that peak.

What are typical maximum UV levels in Surabaya by month?

Peak midday UV index in Surabaya, month by month
MonthPeak midday UV
January13–15
February14–16
March13–16
April12–15
May9–12
June9–11
July9–11
August11–13
September12–15
October13–15
November13–15
December13–14
There is no real UV season in Surabaya: midday levels stay in a similar range all year, from about 11 at the quietest, in June, to about 16 in February. Month by month: January (13–15), February (14–16), March (13–16), April (12–15), May (9–12), June (9–11), July (9–11), August (11–13), September (12–15), October (13–15), November (13–15), and December (13–14).Clear-sky range, 17 years of satellite data (2004–2020). On cloudy days values are typically lower.

How strong is UV in Surabaya in October?

In a typical October, the midday UV index in Surabaya reaches 13–15 on clear days, based on 17 years of satellite data (2004–2020). Cloudy days typically run lower. Check the live forecast for today's value.

Which months have the highest UV in Surabaya?

UV in Surabaya is highest in February–March, when the midday index reaches up to 16 on clear days. The weakest sun is in June–July, around 9–11 at midday.

When do you need sun protection in Surabaya?

All year round: midday UV in Surabaya reaches 3 or higher (the WHO protection level) in every month. In every month it can reach UV 8 or more. The WHO then advises extra protection: avoid the midday sun and cover up.

Forecast · UV Index

Now
UV 0.7 (Low)
Max today
UV 10.6 · 11:00
Max tomorrow
UV 11.9 · 11:00
Clear sky
UV 11.3
Sunrise / Sunset
05:06 / 17:22
High UV window (UV ≥ 3)
08:00–15:00
5-Day UV Forecast
Fri 10.6 · Sat 11.9 · Sun 10.5 · Mon 9.4 · Tue 8.7

UV guides

Read all guides →
About the UV Index

What is the UV index?

The UV index (UVI) is an international standard measure of the strength of ultraviolet radiation from the sun at a particular place and time. It ranges from 0 (nighttime) to 11+ (extreme). Higher values mean greater risk of sunburn, skin damage, and eye injury. The UV index was developed by the World Health Organization (WHO) to help people protect themselves from harmful UV radiation.

How do I check the UV index today?

This page shows the live UV index for your location using data from the Copernicus Atmosphere Monitoring Service (CAMS). You get the current UV level, an hourly UV forecast chart for today and tomorrow, and the exact peak UV time — so you always know when sun protection is most important.

When is UV radiation strongest?

UV radiation is typically strongest between 10:00 and 16:00, when the sun is highest in the sky. However, the exact peak time and intensity depend on your latitude, the season, altitude, cloud cover, and ozone levels. Check the UV forecast chart above to see today's exact peak time for your location.

How can I protect myself from UV radiation?

Apply broad-spectrum sunscreen, wear protective clothing and a wide-brimmed hat, seek shade during peak UV hours, and wear UV-blocking sunglasses. The WHO recommends sun protection when the UV index is 3 or above.

Where does the UV data come from?

The hourly UV index on this site comes from the Copernicus Atmosphere Monitoring Service (CAMS), operated by ECMWF on behalf of the European Union. CAMS calculates the UV biologically effective dose using total column ozone, aerosol optical depth, and cloud cover. The global forecast has a spatial resolution of approximately 40 km and provides hourly UV index values for up to 5 days ahead.

What does "clear-sky UV index" mean?

The clear-sky UV index shows how strong ultraviolet radiation would be if there were no clouds at all. It is calculated using the same atmospheric data — ozone column thickness, aerosol concentrations, and solar angle — but assumes completely cloudless conditions. Comparing the actual UV index with the clear-sky value shows how much clouds are reducing UV exposure at any given time. On overcast days, actual UV can be significantly lower than the clear-sky value.

How often is the UV forecast updated?

The CAMS global UV forecast is updated twice daily, based on model runs initialized at 00:00 and 12:00 UTC. Weather data such as temperature, cloud cover, and sunrise/sunset times is updated every 1–6 hours depending on the region, using weather models from national meteorological services via Open-Meteo. The first 1–2 days of the forecast are typically the most accurate.

What does the WHO recommend for each UV level?

Low (0–2) — No protection needed. You can safely enjoy being outside
Moderate (3–5) — Seek shade during midday hours. Wear a shirt, apply broad-spectrum sunscreen, and put on a hat. Wear UV-blocking sunglasses
High (6–7) — Seek shade during midday hours. Wear a shirt, apply broad-spectrum sunscreen, and put on a hat. Wear UV-blocking sunglasses
Very High (8–10) — Avoid being outside during midday hours. Make sure you seek shade. Shirt, broad-spectrum sunscreen and hat are a must
Extreme (11+) — Avoid being outside during midday hours. Make sure you seek shade. Shirt, broad-spectrum sunscreen and hat are a must

Source: WHO Global Solar UV Index, 2002

uvi·today

Disclaimer: This website is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. UV index data and sun protection guidance are approximate and should not replace professional advice. UV index data is not applicable to infants under 12 months. The WHO recommends keeping them out of direct sunlight at all times. WHO. UV forecasts are based on satellite and atmospheric models. Actual UV levels may vary due to local cloud cover, surface reflection, altitude, and other environmental factors. When in doubt, consult a healthcare provider for personalized sun protection advice. UV and weather data is sourced from third-party APIs (Open-Meteo/CAMS). We do not guarantee accuracy or availability. Data may be delayed or temporarily unavailable.

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UV & weather data: Open-Meteo (CAMS/Copernicus) · Protection guidelines: WHO Global Solar UV Index, 2002 · Location data: GeoNames (CC BY 4.0) · IP2Location LITE · Yr / NRK (CC BY 4.0) · Twemoji (CC BY 4.0)

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