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Shaded-relief atlas plate of South San Francisco, California: rivers, roads, the city limits and where the water drains.
CALIFORNIA · SAN MATEO COUNTY

South San Francisco

64,660 people, 20 ft above sea level in San Mateo County.

20 ftElevation, city center
64,660People, 2024 estimate
9 sq miLand area
Sunny 78°
Sunny now Dew point 54° · NW 13 mph · high 77°
City of South San Francisco River Interstate 2 miles
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The South San Francisco plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.

MILE1
TODAY

Today in South San Francisco

NWS forecast and National Blend of Models · updated 1:00 PM PDT
RIGHT NOW San Francisco International Airport (KSFO) · 12:56 PM
Sunny
78° Sunny Feels like 78° · high of 77° near 1 PM
WindNW 13 mphno gusts
Humidity43%falling to 43% this afternoon
Pressure29.80 in →steady
Visibility10 mihaze-free
CloudsClear
UV index—no forecast
Dew point 54° · Dryabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Clear
Not this weeknone in the forecast for a week
LIKELY AMOUNT—nothing expected
LAST RAINSept. 30.01 in · 26 dry days
ALERTS & OUTLOOKS
! Coastal Flood AdvisoryCoastal Flood Advisory issued September 28 at 9:16PM PDT until October 1 at 5:00PM PDT by NWS San Francisco CA
NWS San Francisco and the Storm Prediction Center · checked 1:47 PM
SUN & MOON
↑ 7:03 AM6:56 PM ↓
11 h 53 m of daylight, 2 minutes less than yesterday
Waning gibbous, 89% lit. The Harvest Moon was full Saturday.
AIR & POLLEN
19
GOODAir quality index · ozone
Tomorrow: 53, moderate. No pollen source yet.

The next three days, hour by hour

Sky: clear, cloudy, night Rain likely National Blend of Models
TUESDAY, SEPT. 29
WEDNESDAY, SEPT. 30
THURSDAY, OCT. 1
FRIDAY, OCT. 2
1p
4p
7p
10p
1a
4a
7a
10a
1p
4p
7p
10p
1a
4a
7a
10a
1p
4p
7p
10p
1a
4a
7a
10a
clear day
clear day
clear night
mostly clear night
mostly clear night
mostly clear night
mostly sunny
mostly sunny
clear day
clear day
mostly clear night
mostly clear night
mostly clear night
mostly clear night
partly cloudy day
mostly sunny
clear day
mostly sunny
mostly clear night
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy day
partly cloudy day
TEMPERATURE °F
77°
57°
78°
56°
79°
58°
CHANCE OF RAIN
50%
WIND, MPH
14
18
12
8
7
6
3
2
10
14
8
7
5
2
3
2
6
12
6
1
0
0
0
1
HOW IT FEELS · DEW POINT
Dry: dew points 52 to 57°

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 75° / 55°
TUE Sept. 29 Sunny Sunny
77° 57°
0% rain — W 16 A
WED Sept. 30 Mostly sunny Mostly sunny
79° 56°
0% rain — W 7 B
THU Oct. 1 Mostly sunny Mostly sunny
79° 58°
0% rain — W 6 C
FRI Oct. 2 Partly cloudy Partly cloudy
79° 59°
0% rain — W 9 C
SAT Oct. 3 Mostly sunny Mostly sunny
81° 60°
0% rain — W 12 C
SUN Oct. 4 Mostly sunny Mostly sunny
79° 59°
0% rain — W 13 C
MON Oct. 5 Mostly sunny Mostly sunny
78° 60°
0% rain — W 14 C
How sure are we? AModels agree: highs within 4° BSome spread: within 8° CWide spread: check back
Range from the National Blend of Models percentiles · graded on Forecast Scores
AIR MAIL

Where today’s air came from

The air arriving over South San Francisco about 5,000 feet above the ground was over the Pacific off California three days ago, and over the California coast a day ago, about 970 miles back along its path. The nine paths traced from around the city fan out, so treat that as a best guess. It came down from about 11,100 feet up, warming and drying as it sank. Near the ground the air came from the California coast; at 10,000 feet, from the open Pacific. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

MILE7
ON THE NETWORK

Around South San Francisco on the Forecast Network

Neighboring plates

San Francisco CA · 8 MI 8 miles north Oakland CA · 13 MI 13 miles northeast San Jose CA · 41 MI 41 miles southeast Stockton CA · 64 MI 64 miles east Sacramento CA · 81 MI 81 miles northeast Fresno CA · 156 MI 156 miles southeast
FORECASTCITY
Atlas plate of South San Francisco, California. Explore the plate
CALIFORNIA · SAN MATEO

South San Francisco

64,660 people, 20 ft above sea level in San Mateo County.

20 ftElevation
64,660People
9 sq miLand
Sunny 78°
SunnyDew point 54°
1

Today in South San Francisco

NEXT 15 HOURS
Now clear day 77° 0%
4p clear day 75° 0%
7p clear night 67° 0%
10p clear night 62° 1%
1a mostly clear night 59° 1%
4a mostly clear night 58° 1%
Clear
NEXT RAINNone this week
→
Tue0%
Sunny Sunny
57
77
A
Wed0%
Mostly sunny Mostly sunny
56
79
B
Thu0%
Mostly sunny Mostly sunny
58
79
C
Fri0%
Partly cloudy Partly cloudy
59
79
C
Sat0%
Mostly sunny Mostly sunny
60
81
C
Sun0%
Mostly sunny Mostly sunny
59
79
C
Mon0%
Mostly sunny Mostly sunny
60
78
C
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
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