1.9 (Low)
Last Updated 45 minutes ago
The hourly Merrimac, MA UV Index forecast for Thursday, September 18th, 2025.
Last Updated 2 hours ago
The UV index forecast for the next five days in Merrimac, MA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Merrimac over the next five days will be 5.9 on Saturday, September 20th at 1:00 pm.
The UV index forecast for Thursday, September 18th in Merrimac, MA is below.
| Time | UV Index | Risk |
|---|---|---|
| 5pm | 0.8 |
Low |
| 6pm | 0.1 |
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 Merrimac, 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 | 1.4 |
Low |
| 10am | 2.8 |
Low |
| 11am | 4.3 |
Moderate |
| 12pm | 5.4 |
Moderate |
| 1pm | 5.6 |
Moderate |
| 2pm | 4.7 |
Moderate |
| 3pm | 3.6 |
Moderate |
| 4pm | 2.1 |
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 Saturday, September 20th in Merrimac, 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 | 1.4 |
Low |
| 10am | 2.9 |
Low |
| 11am | 4.5 |
Moderate |
| 12pm | 5.6 |
Moderate |
| 1pm | 5.9 |
Moderate |
| 2pm | 5.2 |
Moderate |
| 3pm | 3.8 |
Moderate |
| 4pm | 2.2 |
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 Sunday, September 21st in Merrimac, 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 | 1.4 |
Low |
| 10am | 2.8 |
Low |
| 11am | 4.3 |
Moderate |
| 12pm | 5.3 |
Moderate |
| 1pm | 5.4 |
Moderate |
| 2pm | 4.5 |
Moderate |
| 3pm | 3.3 |
Moderate |
| 4pm | 1.9 |
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 Monday, September 22nd in Merrimac, 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 |