UV Index in Nuku'alofa, Tonga

Last updated: July 2, 2025

In Nuku'alofa, Tonga, understanding the UV Index is crucial for maintaining skin health and preventing sunburn. With a tropical climate that often nudges UV levels into higher ranges, awareness of daily UV exposure can make a significant difference in protecting your skin from harmful effects. Typically peaking at 8 around midday, the UV Index here highlights the importance of taking precautions during the sun's most intense hours. By staying informed, you can enjoy the beautiful rays of Nuku'alofa responsibly and safeguard your skin for years to come.

Hourly UV Index in Nuku'alofa

As the day unfolds, the UV Index paints a vivid picture of sun exposure. At 07:00, the sun is just waking up with a UV Index of 0, then steadily rises to 1 by 08:00. By 09:00, it nudges up to 2, before hitting a moderate 4 at 10:00. The intensity peaks at 12:00 and 13:00, reaching a notable 8, indicating a time when protective measures are crucial. As the afternoon rolls on, the index begins to descend, dropping to 7 at 14:00, then falling further to 5 by 15:00. The sun's strength wanes into the evening, landing at 2 by 16:00, and tapering off to 1 by 17:00 and 18:00. Finally, by 19:00, the index returns to 0, as the sun sets, marking the end of the high UV exposure day. Remember to protect your skin during those peak hours!

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	0	low	45 min
08:00	1	low	45 min
09:00	2	low	45 min
10:00	4	moderate	30 min
11:00	6	high	25 min
12:00	8	very high	15 min
13:00	8	very high	15 min
14:00	7	high	25 min
15:00	5	moderate	30 min
16:00	2	low	45 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Nuku'alofa

The UV Index experiences significant seasonal variation, with the highest levels occurring from January to April, where the index reaches extreme levels (15-16) and a burn time of only 10 minutes. November and December also present extreme UV conditions. May marks a transition to very high levels (UV Index 9), with a burn time extending to 15 minutes, while June to August see a decrease in UV intensity yet maintain very high levels, particularly in July and August. As September through October approach extreme levels again, it’s crucial for residents and visitors to take precautions year-round. Sunscreen, protective clothing, and limited sun exposure during peak hours (10 AM to 4 PM) are highly advised, especially during the high-risk months of January to April and September to November.

Monthly Maximum UV Index for Nuku'alofa, Tonga

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Nuku'alofa. 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 Nuku'alofa, 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 Nuku'alofa UV Index with Other Tonga Cities

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

Nuku'alofa's solar exposure compared to other cities in Tonga. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Nuku'alofa	16	15	14	11	9	7	8	10	11	13	15	16
Tatakamotonga UVI	16	15	14	11	9	7	8	10	11	13	15	16
Haveluloto UVI	16	15	14	11	9	7	8	10	11	13	15	16
Lapaha UVI	16	15	14	11	9	7	8	10	11	13	15	16
Neiafu UVI	16	16	15	12	9	7	8	11	12	14	15	16