UV Index for Foster City, CA

Current Foster City UV Index

0 (Low)

Last Updated 45 minutes ago

Hourly Foster City UV Index

The hourly Foster City, CA UV Index forecast for Friday, July 4th, 2025.

5 Day Hourly Foster City UV Index Forecast

Last Updated 15 hours ago

The UV index forecast for the next five days in Foster City, CA has no days reaching the extreme level and 3 days reaching the high or very high levels. The peak UV intensity in Foster City over the next five days will be 9.2 on Saturday, July 5th at 2:00 pm.

The UV index forecast for Friday, July 4th in Foster City, CA is below.

Time UV Index Risk
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0.3
Low
8am 0.9
Low
9am 2.2
Low
10am 4.1
Moderate
11am 6.4
High
12pm 8.1
Very High
1pm 8.9
Very High
2pm 8.8
Very High
3pm 7.6
High
4pm 5.4
Moderate
5pm 3.2
Moderate
6pm 1.5
Low
7pm 0.5
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, July 5th 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 0.2
Low
8am 1
Low
9am 2.4
Low
10am 4.6
Moderate
11am 6.8
High
12pm 8.4
Very High
1pm 9
Very High
2pm 9.2
Very High
3pm 7.7
High
4pm 5.2
Moderate
5pm 3.1
Moderate
6pm 1.5
Low
7pm 0.5
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, July 6th 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 0.2
Low
8am 0.6
Low
9am 1.5
Low
10am 3.4
Moderate
11am 5.7
Moderate
12pm 7.9
High
1pm 8.8
Very High
2pm 8.2
Very High
3pm 7
High
4pm 5.1
Moderate
5pm 3
Moderate
6pm 1.4
Low
7pm 0.4
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, July 7th 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