UV Index Today in Boston, Massachusetts (MA)

Friday, May 22, 2026 -12:59 PMEDT (GMT-4)

The UV Index in Boston, Massachusetts (MA) right now is 7.3. This reading was last updated at 12:00 PM EDT, about 59 minutes ago. The UV Index at1:00 PM EDT, in about less than a minute from now, is expected to be 7.5.

The maximum UV Index today in Boston is expected to be 7.5 at 1:00 PM EDT,less than a minute from now. The maximum UV Index tomorrow is expected to be 3.9 at 1:00 PM EDT.

Data Source: National Oceanic and Atmospheric Administration (NOAA)

Today

May 22
7.5
1:00 PM EDT
Very High

Tomorrow

May 23
3.9
1:00 PM EDT
Moderate

UV Index Today Hourly

May 22

The sun will be strongest in Boston, Massachusetts (MA) around 1:00 PM EDT today, with a UV Index of 7.5 (Very High risk).

02468105 AM6 AM7 AM8 AM9 AM10 AM11 AM12 PM1 PM2 PM3 PM4 PM5 PM6 PM7 PM8 PMEastern Daylight Time (EDT, GMT-4)Now: 12:59 PM00.10.51.42.84.867.37.56.653.21.80.80.20
Data Source: National Oceanic and Atmospheric Administration (NOAA)

UV Index Tomorrow Hourly

May 23

UV Index tomorrow for Boston, Massachusetts (MA) reaches 3.9 at 1:00 PM EDT, representingModerate risk.

02468105 AM6 AM7 AM8 AM9 AM10 AM11 AM12 PM1 PM2 PM3 PM4 PM5 PM6 PM7 PM8 PMEastern Daylight Time (EDT, GMT-4)00.10.31.32.32.93.42.53.93.41.71.40.80.40.10
Data Source: National Oceanic and Atmospheric Administration (NOAA)

5 Day UV Index Forecast

May 21, 2026

TimeUV IndexRisk
12:00 AM0
Low
1:00 AM0
Low
2:00 AM0
Low
3:00 AM0
Low
4:00 AM0
Low
5:00 AM0
Low
6:00 AM0
Low
7:00 AM0.4
Low
8:00 AM0.2
Low
9:00 AM0.6
Low
10:00 AM1.2
Low
11:00 AM4
Moderate
12:00 PM8.4
Very High
1:00 PM8.4
Very High
2:00 PM6
High
3:00 PM6.1
High
4:00 PM3.9
Moderate
5:00 PM1.9
Low
6:00 PM0.6
Low
7:00 PM0.1
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low

May 22, 2026

TimeUV IndexRisk
12:00 AM0
Low
1:00 AM0
Low
2:00 AM0
Low
3:00 AM0
Low
4:00 AM0
Low
5:00 AM0
Low
6:00 AM0.1
Low
7:00 AM0.5
Low
8:00 AM1.4
Low
9:00 AM2.8
Moderate
10:00 AM4.8
Moderate
11:00 AM6
High
12:00 PM7.3
High
1:00 PM7.5
Very High
2:00 PM6.6
High
3:00 PM5
Moderate
4:00 PM3.2
Moderate
5:00 PM1.8
Low
6:00 PM0.8
Low
7:00 PM0.2
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low

May 23, 2026

TimeUV IndexRisk
12:00 AM0
Low
1:00 AM0
Low
2:00 AM0
Low
3:00 AM0
Low
4:00 AM0
Low
5:00 AM0
Low
6:00 AM0.1
Low
7:00 AM0.3
Low
8:00 AM1.3
Low
9:00 AM2.3
Low
10:00 AM2.9
Moderate
11:00 AM3.4
Moderate
12:00 PM2.5
Moderate
1:00 PM3.9
Moderate
2:00 PM3.4
Moderate
3:00 PM1.7
Low
4:00 PM1.4
Low
5:00 PM0.8
Low
6:00 PM0.4
Low
7:00 PM0.1
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low

May 24, 2026

TimeUV IndexRisk
12:00 AM0
Low
1:00 AM0
Low
2:00 AM0
Low
3:00 AM0
Low
4:00 AM0
Low
5:00 AM0
Low
6:00 AM0
Low
7:00 AM0.1
Low
8:00 AM0.2
Low
9:00 AM0.4
Low
10:00 AM0.7
Low
11:00 AM0.7
Low
12:00 PM0.8
Low
1:00 PM0.7
Low
2:00 PM0.8
Low
3:00 PM0.8
Low
4:00 PM0.4
Low
5:00 PM0.1
Low
6:00 PM0.1
Low
7:00 PM0
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low

May 25, 2026

TimeUV IndexRisk
12:00 AM0
Low
1:00 AM0
Low
2:00 AM0
Low
3:00 AM0
Low
4:00 AM0
Low
5:00 AM0
Low
6:00 AM0
Low
7:00 AM0.1
Low
8:00 AM0.3
Low
9:00 AM1
Low
10:00 AM3.2
Moderate
11:00 AM2.4
Low
12:00 PM1.2
Low
1:00 PM2.9
Moderate
2:00 PM3.5
Moderate
3:00 PM2.2
Low
4:00 PM2.6
Moderate
5:00 PM1.7
Low
6:00 PM0.5
Low
7:00 PM0.1
Low
8:00 PM0
Low
9:00 PM0
Low
10:00 PM0
Low
11:00 PM0
Low
Data Source: National Oceanic and Atmospheric Administration (NOAA)

Nearby Places

Maximum UV Index Today
Data Source: National Oceanic and Atmospheric Administration (NOAA)