UV Index for Foster City, CA

Current Foster City UV Index

0 (Low)

Last Updated 15 minutes ago

Hourly Foster City UV Index

The hourly Foster City, CA UV Index forecast for Monday, August 25th, 2025.

5 Day Hourly Foster City UV Index Forecast

Last Updated 10 hours ago

The UV index forecast for the next five days in Foster City, CA has no days reaching the extreme level and 4 days reaching the high or very high levels. The peak UV intensity in Foster City over the next five days will be 8.4 on Monday, August 25th at 1:00 pm.

The UV index forecast for Monday, August 25th in Foster City, CA is below.

Time UV Index Risk
10pm 0
Low
11pm 0
Low

The UV index forecast for Tuesday, August 26th 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 0.4
Low
9am 1.6
Low
10am 3.4
Moderate
11am 5.8
Moderate
12pm 7.5
High
1pm 7.8
High
2pm 7.4
High
3pm 6.2
High
4pm 4.4
Moderate
5pm 2.3
Low
6pm 0.8
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Wednesday, August 27th 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 0.6
Low
9am 1.7
Low
10am 3.6
Moderate
11am 5.8
Moderate
12pm 6.9
High
1pm 7.4
High
2pm 7.1
High
3pm 6
High
4pm 4.1
Moderate
5pm 2.2
Low
6pm 0.8
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Thursday, August 28th 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 0.5
Low
9am 1.7
Low
10am 3.6
Moderate
11am 5.8
Moderate
12pm 7.6
High
1pm 8.4
Very High
2pm 7.3
High
3pm 5.9
Moderate
4pm 4.3
Moderate
5pm 2
Low
6pm 0.7
Low
7pm 0.2
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, August 29th 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