Observed 1:20 AM PDT at KSFO

South San Francisco, CA weather

Clear and 57°14°.

Mostly agree

Now 57°14°

Clear

Wind: Calm; Up to 5 mph8 km/h through 1 PM
Dew point: 52°11°; Comfortable
UV index: 0Low; Moderate 11 AM–5 PM · peak 5
Air quality: 37Good; PM2.5 (fine particles) · tomorrow moderate
Pressure: 30.03 inHg1017 hPa; Steady over the next 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 52°11° tonight at 5 AM
Above 60°16° today by 10 AM
High 71°22° today at 3 PM
Below 60°16° tonight after 8 PM

TonightDown to 52°11° by 5 AM · Clear
This morningUp to 63°17° by 11 AM · Clear
This afternoonUp to 71°22° by 3 PM · Clear
TonightDown to 52°11° by 4 AM · Partly cloudy
Tomorrow morningUp to 62°17° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 70°21° by 3 PM · Mostly cloudy
Tomorrow nightDown to 56°13° by 10 PM · Partly cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 1a	Clear	56°13° (likely 54°12° to 58°14°)	56°13°	0%	2 mph3 km/h from WNW, gusts 5 mph8 km/h	78%	0%	0
Sat 2a	Clear	55°13° (likely 53°12° to 57°14°)	55°13°	0%	1 mph2 km/h from WNW, gusts 4 mph6 km/h	76%	0%	0
Sat 3a	Clear	54°12° (likely 52°11° to 57°14°)	54°12°	0%	1 mph2 km/h from NW, gusts 3 mph5 km/h	75%	3%	0
Sat 4a	Clear	53°12° (likely 52°11° to 56°13°)	53°12°	0%	1 mph2 km/h from NNW, gusts 4 mph6 km/h	74%	6%	0
Sat 5a	Clear	52°11° (likely 51°11° to 56°13°)	52°11°	0%	1 mph2 km/h from NNW, gusts 4 mph6 km/h	74%	9%	0
Sat 6a	Clear	52°11° (likely 51°11° to 56°13°)	52°11°	0%	1 mph2 km/h from N, gusts 2 mph4 km/h	76%	12%	0
Sat 7a	Sunny	52°11° (likely 51°11° to 55°13°)	52°11°	0%	1 mph2 km/h from NE, gusts 2 mph3 km/h	76%	14%	0
Sat 8a	Sunny	52°11° (likely 51°11° to 56°13°)	52°11°	0%	2 mph3 km/h from E, gusts 3 mph4 km/h	76%	14%	0
Sat 9a	Sunny	57°14° (likely 54°12° to 58°14°)	57°14°	0%	2 mph3 km/h from ESE, gusts 5 mph8 km/h	70%	13%	1
Sat 10a	Sunny	60°16° (likely 58°14° to 62°17°)	60°16°	0%	3 mph5 km/h from E, gusts 5 mph8 km/h	63%	6%	2
Sat 11a	Sunny	63°17° (likely 61°16° to 66°19°)	63°17°	0%	5 mph8 km/h from ENE, gusts 4 mph7 km/h	54%	2%	3
Sat 12p	Sunny	66°19° (likely 63°17° to 69°21°)	66°19°	0%	5 mph8 km/h from NE, gusts 5 mph8 km/h	52%	0%	4
Sat 1p	Sunny	68°20° (likely 66°19° to 71°22°)	68°20°	0%	3 mph5 km/h from N, gusts 4 mph7 km/h	48%	0%	5
Sat 2p	Sunny	70°21° (likely 67°19° to 73°23°)	70°21°	0%	3 mph5 km/h from N, gusts 4 mph7 km/h	44%	0%	5
Sat 3p	Sunny	71°22° (likely 67°19° to 72°22°)	71°22°	0%	5 mph8 km/h from NW, gusts 8 mph13 km/h	46%	0%	4
Sat 4p	Sunny	70°21° (likely 66°19° to 70°21°)	70°21°	0%	7 mph11 km/h from WNW, gusts 10 mph17 km/h	46%	0%	3
Sat 5p	Sunny	69°21° (likely 64°18° to 69°21°)	69°21°	0%	9 mph14 km/h from W, gusts 12 mph20 km/h	47%	0%	2
Sat 6p	Clear	66°19° (likely 61°16° to 66°19°)	66°19°	0%	8 mph13 km/h from W, gusts 13 mph21 km/h	59%	1%	1
Sat 7p	Clear	61°16° (likely 58°14° to 61°16°)	61°16°	0%	5 mph8 km/h from W, gusts 13 mph21 km/h	69%	2%	0
Sat 8p	Clear	59°15° (likely 57°14° to 60°16°)	59°15°	0%	3 mph5 km/h from W, gusts 12 mph20 km/h	75%	19%	0
Sat 9p	Clear	58°14° (likely 56°13° to 59°15°)	58°14°	0%	1 mph2 km/h from W, gusts 11 mph17 km/h	76%	18%	0
Sat 10p	Clear	57°14° (likely 54°12° to 59°15°)	57°14°	0%	0 mph0 km/h, gusts 8 mph13 km/h	80%	18%	0
Sat 11p	Clear	56°13° (likely 53°12° to 58°14°)	56°13°	0%	0 mph0 km/h, gusts 7 mph11 km/h	80%	21%	0
Sun 12a	Mostly clear	56°13° (likely 52°11° to 58°14°)	56°13°	0%	0 mph0 km/h, gusts 7 mph12 km/h	82%	24%	0
Sun 1a	Clear	54°12° (likely 51°11° to 57°14°)	55°13°	0%	0 mph0 km/h, gusts 7 mph11 km/h	83%	31%	0
Sun 2a	Clear	54°12° (likely 51°11° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 7 mph11 km/h	84%	36%	0
Sun 3a	Cloudy	53°12° (likely 50°10° to 56°13°)	53°12°	0%	0 mph0 km/h, gusts 6 mph9 km/h	84%	74%	0
Sun 4a	Cloudy	52°11° (likely 50°10° to 55°13°)	52°11°	0%	0 mph0 km/h, gusts 5 mph9 km/h	84%	71%	0
Sun 5a	Partly cloudy	52°11° (likely 49°9° to 55°13°)	52°11°	0%	0 mph0 km/h, gusts 6 mph10 km/h	84%	67%	0
Sun 6a	Partly cloudy	52°11° (likely 48°9° to 54°12°)	52°11°	0%	0 mph0 km/h, gusts 7 mph11 km/h	88%	73%	0
Sun 7a	Partly sunny	52°11° (likely 48°9° to 54°12°)	52°11°	0%	0 mph0 km/h, gusts 7 mph12 km/h	89%	74%	0
Sun 8a	Cloudy	52°11° (likely 49°9° to 54°12°)	52°11°	0%	2 mph3 km/h from ENE, gusts 7 mph12 km/h	90%	74%	0
Sun 9a	Cloudy	56°13° (likely 52°11° to 56°13°)	56°13°	0%	2 mph3 km/h from ENE, gusts 7 mph11 km/h	85%	73%	1
Sun 10a	Cloudy	59°15° (likely 55°13° to 59°15°)	59°15°	0%	2 mph3 km/h from ENE, gusts 5 mph8 km/h	80%	71%	2
Sun 11a	Cloudy	62°17° (likely 58°14° to 62°17°)	62°17°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	73%	69%	3
Sun 12p	Partly sunny	66°19° (likely 61°16° to 66°19°)	66°19°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	69%	58%	4
Sun 1p	Partly sunny	68°20° (likely 63°17° to 68°20°)	68°20°	0%	2 mph3 km/h from N, gusts 7 mph12 km/h	60%	73%	4
Sun 2p	Cloudy	69°21° (likely 63°17° to 69°21°)	69°21°	0%	5 mph8 km/h from W, gusts 11 mph17 km/h	55%	79%	4
Sun 3p	Cloudy	70°21° (likely 62°17° to 70°21°)	70°21°	0%	5 mph8 km/h from W, gusts 13 mph21 km/h	56%	81%	4
Sun 4p	Cloudy	69°21° (likely 60°16° to 69°21°)	69°21°	0%	5 mph8 km/h from W, gusts 14 mph22 km/h	58%	84%	3
Sun 5p	Cloudy	68°20° (likely 59°15° to 68°20°)	68°20°	0%	7 mph11 km/h from W, gusts 14 mph22 km/h	58%	84%	2
Sun 6p	Partly cloudy	65°18° (likely 57°14° to 65°18°)	65°18°	0%	7 mph11 km/h from W, gusts 14 mph22 km/h	68%	85%	0
Sun 7p	Partly cloudy	62°17° (likely 56°13° to 62°17°)	62°17°	0%	7 mph11 km/h from W, gusts 12 mph19 km/h	75%	77%	0
Sun 8p	Mostly clear	59°15° (likely 55°13° to 59°15°)	59°15°	0%	2 mph3 km/h from WSW, gusts 11 mph18 km/h	80%	45%	0
Sun 9p	Clear	57°14° (likely 54°12° to 58°14°)	57°14°	0%	2 mph3 km/h from WSW, gusts 12 mph19 km/h	82%	31%	0
Sun 10p	Clear	56°13° (likely 53°12° to 57°14°)	57°14°	0%	2 mph3 km/h from WSW, gusts 11 mph17 km/h	83%	34%	0
Sun 11p	Clear	56°13° (likely 52°11° to 58°14°)	56°13°	0%	2 mph3 km/h from W, gusts 9 mph15 km/h	84%	35%	0
Mon 12a	Mostly clear	56°13° (likely 53°12° to 59°15°)	56°13°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	85%	35%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Sunny. High 71°22°, low 52°11°. Typical 71°22° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  Dry
Official NWS forecast
Today: Sunny. High near 71, with temperatures falling to around 69 in the afternoon. North northeast wind 1 to 9 mph.
Tonight: Clear, with a low around 52. Northwest wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–73°23°
Low, likely
50°10°–56°13°
Typical high / low
71°22° / 52°11°
Wind
11 mph18 km/h, gusts 19 mph31 km/h
UV peak
5
Tomorrow, Oct 25. Partly sunny. High 71°22°, low 52°11°. Typical 71°22° / 52°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 55°13°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 71. North wind 0 to 7 mph.
Night: Partly cloudy, with a low around 52. West southwest wind 2 to 7 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–71°22°
Low, likely
48°9°–54°12°
Typical high / low
71°22° / 52°11°
Wind
12 mph20 km/h
UV peak
4
Monday, Oct 26. Fog. High 66°19°, low 51°11°. Typical 70°21° / 52°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 54°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog between 7am and 8am. Mostly sunny, with a high near 66.
Night: Mostly clear, with a low around 51.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–66°19°
Low, likely
51°11°–57°14°
Typical high / low
70°21° / 52°11°
Wind
13 mph21 km/h, gusts 21 mph33 km/h
UV peak
4
Tuesday, Oct 27. Cloudy. High 66°19°, low 54°12°. Typical 70°21° / 52°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 54°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog before 10am. Mostly sunny, with a high near 66.
Night: Partly cloudy, with a low around 54.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–66°19°
Low, likely
52°11°–55°13°
Typical high / low
70°21° / 52°11°
Wind
16 mph26 km/h
UV peak
5
Wednesday, Oct 28. Cloudy. High 63°17°, low 55°13°. Typical 70°21° / 52°11°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 56°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 63.
Night: Mostly cloudy, with a low around 55.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–63°17°
Low, likely
52°11°–55°13°
Typical high / low
70°21° / 52°11°
Wind
15 mph24 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 61°16°, low 55°13°. Typical 70°21° / 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 55°13°
  30% chance · 0.01 in0.3 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain after 5pm. Mostly sunny, with a high near 61.
Night: A chance of rain. Partly cloudy, with a low around 55.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–64°18°
Low, likely
53°12°–57°14°
Typical high / low
70°21° / 52°11°
Wind
11 mph18 km/h, gusts 17 mph28 km/h
UV peak
4
Friday, Oct 30. Rain. High 60°16°, low 53°12°. Typical 69°21° / 51°11°. Rain 0.05 in1.3 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 55°13°
  30% chance · 0.02 in0.6 mm
2. Afternoon
  noon–6 PM
  Partly sunny, 61°16°
  30% chance · 0.02 in0.5 mm
3. Evening
  6 PM–midnight
  Mostly clear, 56°13°
  30% chance
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  30% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain. Partly sunny, with a high near 60.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–63°17°
Low, likely
53°12°–54°12°
Typical high / low
69°21° / 51°11°
Wind
10 mph17 km/h, gusts 19 mph31 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 62°17°, low 51°11°. Typical 69°21° / 51°11°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 52°11°
  30% chance
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  30% chance
3. Evening
  6 PM–midnight
  Clear, 59°15°
  30% chance
4. Overnight
  midnight–6 AM
  Cloudy, 53°12°
  30% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
59°15°–67°19°
Low, likely
48°9°–54°12°
Typical high / low
69°21° / 51°11°
Wind
9 mph15 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 66°19°, low 53°12°. Typical 69°21° / 51°11°. Rain, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  30% chance
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  30% chance
3. Evening
  6 PM–midnight
  Clear, 62°17°
  20% chance
4. Overnight
  midnight–6 AM
  Partly cloudy, 55°13°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–70°21°
Low, likely
48°9°–59°15°
Typical high / low
69°21° / 51°11°
Wind
10 mph17 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 65°18°, low 56°13°. Typical 68°20° / 51°11°. Rain 0.01 in0.3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 57°14°
  20% chance
2. Afternoon
  noon–6 PM
  Partly sunny, 67°19°
  20% chance
3. Evening
  6 PM–midnight
  Cloudy, 63°17°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–72°22°
Low, likely
53°12°–62°17°
Typical high / low
68°20° / 51°11°
Wind
10 mph15 km/h, gusts 17 mph27 km/h
UV peak
4

10 days15 days30 days

The outlook

Today
Dry, high 71°, low 52°.
Tomorrow
Dry, high 71°, low 52°.
Monday
Dry, high 66°, low 51°, cooling off.
Rest of week
Mostly dry, highs 60–66°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (MTR) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Colma Creek at South San Francisco

2.8 mi

Level: 0.0 ft

Reading from Sat 12:04 AM · NWS gauge page

El Zanjon Creek at First Avenue

2.8 mi

Level: 0.1 ft

Reading from Fri 11:03 PM · NWS gauge page

Green Hills Creek at Green Hill Country Club

4.1 mi

Level: 0.1 ft

Reading from Fri 8:18 PM · NWS gauge page

San Andreas Lake near Millbrae

5.6 mi

Level: 447 ft
Flow: 16,600 cfs

Reading from Fri 11:45 PM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 55% less heating than a typical week.

This week 13Typical 28

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 52°F).

Open the windows?

Today, 10:00 AM–7:00 PM

Good stretch to open the windows.

Is this typical?

San Francisco International Airport · official normals 1991–2020 · records 1945–2026

Oct 24, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

On average 1° colder than normal (daily mean temperature).

−1°SunOct 18
−2°−1°MonOct 19
−1°TueOct 20
±0°WedOct 21
−1°ThuOct 22
—FriOct 23
—SatOct 24

South San Francisco weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 53 min; Losing 2 min 16 s a day; shortest Dec 21, 1 h 20 min less
Golden hour: 5:43–6:36 PM; Morning 7:10–8:02 AM
Blue hour: 6:36–6:46 PM; Morning 6:59–7:10 AM; first light 6:59 AM

Stars tonight? Good

Clear 1:41–6:59 AM; moon 96% lit, sets 5:48 AM.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:48 AM · rises 5:19 PM
Full moon: Oct 25
New moon: Nov 8

Looking east from South San Francisco. The highest point on the skyline is about 4,200 ft, 46 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.