5.1 (Moderate)
Last Updated 45 minutes ago
The hourly Waltham, MA UV Index forecast for Monday, September 15th, 2025.
Last Updated 44 minutes ago
The UV index forecast for the next five days in Waltham, MA has no days reaching the extreme level and 2 days reaching the high or very high levels. The peak UV intensity in Waltham over the next five days will be 6.1 on Tuesday, September 16th at 1:00 pm.
The UV index forecast for Monday, September 15th in Waltham, MA is below.
| Time | UV Index | Risk |
|---|---|---|
| 3pm | 3.9 |
Moderate |
| 4pm | 2.3 |
Low |
| 5pm | 1 |
Low |
| 6pm | 0.2 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Tuesday, September 16th in Waltham, MA is below.
| Time | UV Index | Risk |
|---|---|---|
| 12am | 0 |
Low |
| 1am | 0 |
Low |
| 2am | 0 |
Low |
| 3am | 0 |
Low |
| 4am | 0 |
Low |
| 5am | 0 |
Low |
| 6am | 0 |
Low |
| 7am | 0 |
Low |
| 8am | 0.5 |
Low |
| 9am | 1.5 |
Low |
| 10am | 3 |
Moderate |
| 11am | 4.6 |
Moderate |
| 12pm | 5.8 |
Moderate |
| 1pm | 6.1 |
High |
| 2pm | 5.3 |
Moderate |
| 3pm | 3.7 |
Moderate |
| 4pm | 2.1 |
Low |
| 5pm | 0.8 |
Low |
| 6pm | 0.2 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Wednesday, September 17th in Waltham, MA is below.
| Time | UV Index | Risk |
|---|---|---|
| 12am | 0 |
Low |
| 1am | 0 |
Low |
| 2am | 0 |
Low |
| 3am | 0 |
Low |
| 4am | 0 |
Low |
| 5am | 0 |
Low |
| 6am | 0 |
Low |
| 7am | 0 |
Low |
| 8am | 0.4 |
Low |
| 9am | 1.1 |
Low |
| 10am | 2.4 |
Low |
| 11am | 3.8 |
Moderate |
| 12pm | 4.6 |
Moderate |
| 1pm | 5 |
Moderate |
| 2pm | 4.7 |
Moderate |
| 3pm | 3.6 |
Moderate |
| 4pm | 2.1 |
Low |
| 5pm | 0.8 |
Low |
| 6pm | 0.2 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Thursday, September 18th in Waltham, MA is below.
| Time | UV Index | Risk |
|---|---|---|
| 12am | 0 |
Low |
| 1am | 0 |
Low |
| 2am | 0 |
Low |
| 3am | 0 |
Low |
| 4am | 0 |
Low |
| 5am | 0 |
Low |
| 6am | 0 |
Low |
| 7am | 0 |
Low |
| 8am | 0.5 |
Low |
| 9am | 1.4 |
Low |
| 10am | 2.9 |
Low |
| 11am | 4.5 |
Moderate |
| 12pm | 5.6 |
Moderate |
| 1pm | 5.9 |
Moderate |
| 2pm | 5.2 |
Moderate |
| 3pm | 3.6 |
Moderate |
| 4pm | 2 |
Low |
| 5pm | 0.9 |
Low |
| 6pm | 0.2 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Friday, September 19th in Waltham, MA is below.
| Time | UV Index | Risk |
|---|---|---|
| 12am | 0 |
Low |
| 1am | 0 |
Low |
| 2am | 0 |
Low |
| 3am | 0 |
Low |
| 4am | 0 |
Low |
| 5am | 0 |
Low |
| 6am | 0 |
Low |
| 7am | 0 |
Low |
| 8am | 0.4 |
Low |