UV Index in Semalang, Indonesia

Last updated: June 2, 2025

Understanding the UV Index in Semalang, Indonesia is essential for both locals and visitors who want to protect their health under the tropical sun. As Semalang's climate falls within the Aw zone, the area experiences significant UV exposure, particularly during midday hours. Monitoring UV levels can aid in preventing sunburns and maintaining long-term skin health, as demonstrated by the varying indices throughout the day—soaring to a peak of 10 between 11:00 AM and 12:00 PM. By staying informed about these levels, you can enjoy the beautiful outdoors safely while minimizing the risks associated with excessive sun exposure.

Hourly UV Index in Semalang

The UV Index today showcases a dynamic range, starting off mild at 7:00 AM with a value of 2. As the day progresses, the sun rises higher, peaking at 11:00 AM and 12:00 PM with a maximum index of 10, indicating very high levels of UV radiation. This midday surge makes 9:00 AM and 10:00 AM critical hours to protect your skin, reaching 7 and 9, respectively. Post-noon, the index gradually declines, dropping to 5 by 2:00 PM, before tapering off to 1 by 4:00 PM and returning to 0 after 6:00 PM. Stay vigilant during the peak hours to ensure safe sun exposure!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
Time	UVI	Category	Time to Burn
07:00	2	low	45 min
08:00	4	moderate	30 min
09:00	7	high	25 min
10:00	9	very high	15 min
11:00	10	very high	15 min
12:00	10	very high	15 min
13:00	8	very high	15 min
14:00	5	moderate	30 min
15:00	2	low	45 min
16:00	1	low	45 min
17:00	1	low	45 min
18:00	0	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Semalang

The UV Index experiences significant fluctuations throughout the year, consistently remaining in the extreme or very high categories from January to November, with levels peaking in October at 16. The high-risk months for UV exposure are identified as February, March, September, and October, when UV Index values regularly reach 15 or higher, making a burn time of just 10 minutes critical for unprotected skin. Residents and visitors should exercise caution during these months, seeking shade, wearing protective clothing, and applying broad-spectrum sunscreen regularly. Alongside June and July, which feature slightly lower indices of 10 and 11 respectively, they still demand vigilance due to the prolonged sunlight exposure characteristic of summer. Being informed and prepared can help prevent harmful effects from UV radiation throughout the year.

Monthly Maximum UV Index for Semalang, Indonesia

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Semalang. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Semalang, based on information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

Compare Semalang UV Index with Other Indonesia Cities

The table above highlights how UV exposure in Semalang compares to other major locations across Indonesia. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Semalang's solar exposure compared to other cities in Indonesia. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Surabaya UVI	13	15	14	12	12	10	11	12	14	13	13	13
Bekasi UVI	14	16	16	14	11	10	10	11	13	15	14	13
Jakarta UVI	14	16	16	14	11	10	10	11	13	15	14	13
Medan UVI	13	15	15	15	14	12	12	13	14	14	13	12
Bandung UVI	15	16	16	15	12	11	11	12	14	15	15	14
Semalang	14	15	15	14	12	10	11	13	15	16	14	14