Sunny Hours / UV index / US / Boston
UV index in Boston, MA today
Today's peak UV index in Boston is 1 (low), around 12pm. That is low, so no sun protection is needed. Tomorrow's peak is 3 (moderate).
- Peak today1 (low)
- Time of peakAround 12pm
- Hours at 3 or above0
- Sunrise6:58 am
- Sunset6:00 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Today | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
| Sat, Oct 17 | 0 | 0 | 0 | 1 | 1 | 2 | 3 | 3 | 3 | 3 | 2 | 1 |
| Sun, Oct 18 | 0 | 0 | 1 | 2 | 3 | 4 | 4 | 4 | 3 | 2 | 1 | |
| Mon, Oct 19 | 0 | 0 | 1 | 2 | 3 | 3 | 3 | 3 | 2 | 2 | 1 | |
| Tue, Oct 20 | 0 | 0 | 1 | 2 | 3 | 3 | 4 | 3 | 3 | 2 | 1 | |
| Wed, Oct 21 | 0 | 0 | 1 | 2 | 3 | 3 | 3 | 3 | 2 | 2 | 1 | |
| Thu, Oct 22 | 0 | 0 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 1 | 1 |
- 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 | 1 | low | None | 6:58 am | 6:00 pm |
| Sat, Oct 17 | 3 | moderate | 12pm to 4pm | 6:59 am | 5:59 pm |
| Sun, Oct 18 | 4 | moderate | 11am to 4pm | 7:00 am | 5:57 pm |
| Mon, Oct 19 | 3 | moderate | 11am to 3pm | 7:01 am | 5:55 pm |
| Tue, Oct 20 | 4 | moderate | 11am to 4pm | 7:03 am | 5:54 pm |
| Wed, Oct 21 | 3 | moderate | 11am to 3pm | 7:04 am | 5:52 pm |
| Thu, Oct 22 | 2 | low | None | 7:05 am | 5:51 pm |
What today's level means
Today's peak of 1 is in the low band. The guidance for that band is: no protection needed. 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 16 at 6:28 PM. This is a forecast, not a measurement. Weather data by Open-Meteo.