2.8 (Low)
Last Updated 15 minutes ago
The hourly Port St. John, FL UV Index forecast for Thursday, December 18th, 2025.
Last Updated 1 hour ago
The UV index forecast for the next five days in Port St. John, FL has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Port St. John over the next five days will be 4.1 on Sunday, December 21st at 12:00 pm.
The UV index forecast for Thursday, December 18th in Port St. John, FL is below.
| Time | UV Index | Risk |
|---|---|---|
| 3pm | 1.8 |
Low |
| 4pm | 0.8 |
Low |
| 5pm | 0.1 |
Low |
| 6pm | 0 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Friday, December 19th in Port St. John, FL 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 | 0.2 |
Low |
| 9am | 0.8 |
Low |
| 10am | 2 |
Low |
| 11am | 2.9 |
Low |
| 12pm | 3.9 |
Moderate |
| 1pm | 3.9 |
Moderate |
| 2pm | 3.2 |
Moderate |
| 3pm | 1.8 |
Low |
| 4pm | 0.7 |
Low |
| 5pm | 0.1 |
Low |
| 6pm | 0 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Saturday, December 20th in Port St. John, FL 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 | 0.2 |
Low |
| 9am | 0.8 |
Low |
| 10am | 1.8 |
Low |
| 11am | 3.1 |
Moderate |
| 12pm | 4 |
Moderate |
| 1pm | 3.9 |
Moderate |
| 2pm | 3.1 |
Moderate |
| 3pm | 1.8 |
Low |
| 4pm | 0.8 |
Low |
| 5pm | 0.2 |
Low |
| 6pm | 0 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Sunday, December 21st in Port St. John, FL 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 | 0.2 |
Low |
| 9am | 0.9 |
Low |
| 10am | 2.1 |
Low |
| 11am | 3.4 |
Moderate |
| 12pm | 4.1 |
Moderate |
| 1pm | 4 |
Moderate |
| 2pm | 3.2 |
Moderate |
| 3pm | 1.9 |
Low |
| 4pm | 0.8 |
Low |
| 5pm | 0.2 |
Low |
| 6pm | 0 |
Low |
| 7pm | 0 |
Low |
| 8pm | 0 |
Low |
| 9pm | 0 |
Low |
| 10pm | 0 |
Low |
| 11pm | 0 |
Low |
The UV index forecast for Monday, December 22nd in Port St. John, FL 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 |