Sunny Hours / UV index / US / Boston
UV index in Boston, MA today
Today's peak UV index in Boston is 5 (moderate), around 1pm. It is 3 or above from 10am to 5pm, which is when the EPA recommends protecting your skin. Tomorrow's peak is 5 (moderate).
- UV now3 (moderate)
- Peak today5 (moderate)
- Time of peakAround 1pm
- Hours at 3 or above7
- Sunrise6:50 am
- Sunset6:11 pm
UV index in Boston by hour, next 7 days
Each square is one daylight hour and the number in it is the UV index for that hour. The numbers across the top are the hour of the day.
| 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Today | 0 | 0 | 0 | 1 | 3 | 4 | 5 | 5 | 4 | 4 | 3 | 1 | 0 |
| Sat, Oct 10 | 0 | 0 | 0 | 1 | 2 | 4 | 4 | 5 | 4 | 4 | 3 | 1 | 0 |
| Sun, Oct 11 | 0 | 0 | 0 | 1 | 2 | 3 | 4 | 3 | 3 | 2 | 2 | 1 | 0 |
| Mon, Oct 12 | 0 | 0 | 0 | 1 | 1 | 1 | 3 | 3 | 3 | 3 | 3 | 1 | 0 |
| Tue, Oct 13 | 0 | 0 | 0 | 0 | 2 | 3 | 5 | 5 | 4 | 2 | 1 | 1 | 0 |
| Wed, Oct 14 | 0 | 0 | 0 | 1 | 3 | 4 | 4 | 4 | 4 | 3 | 2 | 1 | 0 |
| Thu, Oct 15 | 0 | 0 | 0 | 1 | 3 | 4 | 4 | 4 | 4 | 3 | 2 | 1 | 0 |
- Low (1 to 2)
- Moderate (3 to 5)
- High (6 to 7)
- Very high (8 to 10)
Day by day
| Day | Peak UV | Level | At 3 or above | Sunrise | Sunset |
|---|---|---|---|---|---|
| Today | 5 | moderate | 10am to 5pm | 6:50 am | 6:11 pm |
| Sat, Oct 10 | 5 | moderate | 11am to 5pm | 6:51 am | 6:10 pm |
| Sun, Oct 11 | 4 | moderate | 11am to 3pm | 6:52 am | 6:08 pm |
| Mon, Oct 12 | 3 | moderate | 12pm to 5pm | 6:53 am | 6:07 pm |
| Tue, Oct 13 | 5 | moderate | 11am to 3pm | 6:54 am | 6:05 pm |
| Wed, Oct 14 | 4 | moderate | 10am to 4pm | 6:56 am | 6:03 pm |
| Thu, Oct 15 | 4 | moderate | 10am to 4pm | 6:57 am | 6:02 pm |
What today's level means
Today's peak of 5 is in the moderate band. The guidance for that band is: seek shade around midday, cover up and wear sunscreen. The EPA recommends protecting your skin whenever the index is 3 or higher, and you can burn even when it is cloudy.
The UV index depends mostly on how high the sun is in the sky, so it peaks around the middle of the day and is far higher in summer than in winter. It is not the same as temperature. For the full scale and what it means for tanning and burning, see what the UV index numbers mean.
UV tells you how strong the sun is, not whether it will be out. For that, see the sunshine forecast for Boston.
UV index in other cities
UV forecast for Boston, Massachusetts. Updated October 9 at 4:41 PM. This is a forecast, not a measurement. Weather data by Open-Meteo.