UV Index for Foster City, CA

Current Foster City UV Index

0.1 (Low)

Last Updated 14 minutes ago

Hourly Foster City UV Index

The hourly Foster City, CA UV Index forecast for Monday, December 15th, 2025.

5 Day Hourly Foster City UV Index Forecast

Last Updated 22 hours ago

The UV index forecast for the next five days in Foster City, CA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Foster City over the next five days will be 2.2 on Monday, December 15th at 12:00 pm.

The UV index forecast for Monday, December 15th in Foster City, CA is below.

Time UV Index Risk
9am 0.5
Low
10am 1.2
Low
11am 1.9
Low
12pm 2.2
Low
1pm 1.9
Low
2pm 1.4
Low
3pm 0.7
Low
4pm 0.2
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Tuesday, December 16th in Foster City, CA 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 0.1
Low
9am 0.5
Low
10am 1.3
Low
11am 2
Low
12pm 2.2
Low
1pm 1.8
Low
2pm 1.2
Low
3pm 0.6
Low
4pm 0.2
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Wednesday, December 17th in Foster City, CA 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 0.1
Low
9am 0.4
Low
10am 0.8
Low
11am 1.6
Low
12pm 2.2
Low
1pm 2
Low
2pm 1.6
Low
3pm 0.8
Low
4pm 0.2
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, December 18th in Foster City, CA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low