Traffic Predict
SR-99 South Traffic in Seattle
As of 11:00 pm PDT, SR-99 South in Seattle is averaging 62 mph across 15 sensors.
Open the live map of SR-99 South →
Is SR-99 South moving right now?
Yes. No stretch of SR-99 South in Seattle is under 40 mph right now (as of 11:00 pm PDT).
Best time to drive SR-99 South
Traffic is usually worst on Wednesday around 5 pm (about 53 mph). On weekdays the morning slowdown peaks around 8 am (60 mph on Tuesdays) and the evening slowdown around 5 pm (53 mph on Wednesdays). Midday (10 am to 2 pm) averages 62 mph. On weekends it is slowest on Saturdays around 5 pm (59 mph).
| Day | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mon | 62 | 62 | 62 | 61 | 61 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | – | 62 | 62 | 62 | 62 |
| Tue | 62 | 62 | 61 | 60 | 61 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 61 | 62 | 62 | 62 | – |
| Wed | 62 | 62 | 62 | 61 | 61 | 62 | 62 | 62 | – | 62 | – | – | 53 | 62 | – | 62 | 62 |
| Thu | 62 | 62 | 62 | 61 | 61 | 62 | 62 | 62 | 62 | 62 | 61 | – | 54 | 61 | 62 | 62 | 62 |
| Fri | 62 | 62 | 62 | 61 | 62 | 62 | 62 | 62 | 62 | 61 | 60 | 59 | 60 | 62 | 62 | 62 | 62 |
| Sat | – | – | – | – | – | – | – | – | – | 62 | 62 | 61 | 59 | 62 | 62 | 62 | 62 |
| Sun | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 61 | 62 | – | 62 | 62 | 62 | – | – | – | – |
Averages of every 5-minute reading we have recorded at this time of the week. Colors match the live map.
Questions
When is traffic worst on SR-99 South in Seattle?
Traffic on SR-99 South is usually worst on Wednesday around 5 pm (about 53 mph).
What is the best time to drive SR-99 South in Seattle?
On weekdays, avoid around 8 am (60 mph on Tuesdays) and around 5 pm (53 mph on Wednesdays). Midday (10 am to 2 pm) averages 62 mph, and early mornings and late evenings are fastest.
Is SR-99 South busy right now?
As of 11:00 pm PDT, SR-99 South in Seattle is averaging 62 mph across 15 sensors.
Plan ahead: Seattle traffic tomorrow · Traffic estimator
Other freeways in Seattle
US-2 East · US-2 West · I-5 North · I-5 South · SR-9 North · SR-9 South · SR-16 East · SR-16 West · SR-18 East · SR-18 West · I-90 East · I-90 West · SR-99 North · SR-167 North · SR-167 South · I-405 North · I-405 South · SR-509 North · SR-509 South · SR-512 East · SR-512 West · SR-520 East · SR-520 West · SR-522 East · SR-522 West · SR-525 North · SR-525 South