UV Index in Boston Today — Check Current UV Levels in Boston, Massachusetts

Check the real-time UV index in Boston right now. Get the current UV level, hourly UV forecast for today, and a 7-day UV outlook for Boston, Massachusetts. Our free UV checker helps you know exactly when sun protection is needed before heading outdoors.

Current UV Index in Boston

The UV index in Boston changes throughout the day, typically peaking between 10am and 2pm local time. Use our interactive tool above to check the current level. Coastal breezes can mask sun intensity — UV remains high even when it feels cool

Hourly UV Forecast for Boston Today

Planning outdoor activities in Boston, Massachusetts? Check our hourly UV breakdown to find the safest windows. Morning hours before 10am and late afternoon after 4pm generally have the lowest UV levels. Our forecast updates every 15 minutes with data from Open-Meteo weather services.

7-Day UV Forecast for Boston

Plan your week in Boston with our 7-day UV index forecast. See which days will have the highest UV so you can schedule outdoor activities accordingly and prepare with the right level of sun protection.

Sun Protection Guide for Boston

UV Index	Level	What to Do in Boston
0–2	Low	Enjoy outdoor activities freely. Sunscreen optional for most skin types.
3–5	Moderate	Wear SPF 30+ sunscreen. Seek shade during midday hours in Boston.
6–7	High	Limit midday sun exposure. Use SPF 50+, wear a hat and sunglasses.
8–10	Very High	Minimize outdoor time between 10am–4pm. Full sun protection essential.
11+	Extreme	Avoid direct sun exposure. Stay indoors or in full shade during peak hours.

Typical UV Levels in Boston

Boston typically experiences UV index values of 7–9 during peak season (June–August) and 1–2 during the off-season. Sharp seasonal contrast — summer UV can be surprisingly strong while winter UV is minimal

Best Time for Outdoor Activities in Boston

The safest time for outdoor activities in Boston is before 10am and after 4pm when UV levels drop significantly. During summer when days are longest, midday UV can reach very high or extreme levels. Always check the current UV index before extended outdoor plans.

Recommended SPF for Boston

During peak UV season in Boston (June–August), dermatologists recommend SPF 50+ broad-spectrum sunscreen. Apply 15–20 minutes before sun exposure and reapply every 2 hours — or immediately after swimming or sweating. During lower UV months, SPF 30 is typically sufficient for most skin types.

Boston UV Index by Season

High UV Season in Boston

UV levels in Boston are highest during summer when days are longest, with the UV index regularly reaching 7–9. During this period, unprotected fair skin can burn in as little as 10–15 minutes. Protective clothing, wide-brim hats, and UV-blocking sunglasses are recommended alongside sunscreen.

Low UV Season in Boston

UV levels in Boston drop in winter when the sun sits low on the horizon, typically measuring 1–2 on the UV index scale. While the burn risk is lower, UV radiation still reaches the surface — especially on clear days. SPF 30 is recommended for extended outdoor time even during the cooler months.

Recommended Sun Protection

• EltaMD UV Clear SPF 46 — #1 face sunscreen for daily protection. $37
• Supergoop! Glowscreen SPF 40 — Tinted primer with UV protection. $22
• Neutrogena Ultra Sheer SPF 70 — Budget body sunscreen. $10
• Banana Boat Light As Air SPF 50 — Lightweight twin pack. $15
• Roadbox UPF 50+ Sun Shirt — UV protective clothing. $19
• Outdoor Research Sombriolet Hat — UPF 50+ sun hat. $45

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Sun Safety FAQ for Boston

What is the average UV index in Boston?

The average UV index in Boston ranges from 1–2 during the low season to 7–9 during peak months (June–August). Year-round averages depend on season, cloud cover, and time of day.

When is UV highest in Boston?

UV is highest in Boston during summer when days are longest, peaking between 10am and 2pm local time. The strongest UV months are typically June–August.

Do I need sunscreen in Boston?

Yes — whenever the UV index reaches 3 or higher in Boston, the World Health Organization recommends sun protection. During peak season (June–August), daily sunscreen use is strongly advised for all skin types.

UV Index Near Boston

Check UV levels in cities near Boston:

UV Index in Other Cities

About UV Index in Boston

The UV index in Boston, Massachusetts is influenced by latitude, altitude, season, cloud cover, and ozone layer thickness. UV radiation reflects off water, sand, snow, and concrete — increasing exposure even in shaded areas. Always check the current UV index before spending extended time outdoors in Boston. Data is updated every 15 minutes via Open-Meteo weather services.