South San Francisco, CA Weather Forecast | 5 Day
Updated: Fri Sep 18th 2026 4:15 AM PDT
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Sunny
Fri 9-18-26
Sunny with a high of 64°F and a low of 60°F. There's a very small chance of rainfall, only about 9%. Wind will be moderate, blowing around 13mph on average and gusts of 19.9mph at 1 PM. The humidity will be on the higher side, averaging about 80%, the maximum being 87% at 11 PM and 71% being its lowest at 3 PM. Barometric pressure is its highest of 30.13inHg at 10 AM, a lowest point of 30.01inHg at 7 PM with an avg 30.07inHg.
- HI: 64°F
- LO: 60°F
- Rainfall: 9%
- Snowfall: 0%
- Wind
12.8 mph - Humidity
80% avg. - UV Index
6.7 - Air QualityGood
- Sunrise
06:54 AM - Sunset
07:13 PM - Moonrise
03:01 PM - Moonset
Does not set today - Moon Phase
First Quarter
Sunny
Weather Tomorrow, Sat 9-19-26
Sunny with a high of 64°F and a low of 58°F. There might be light rainfall having a 13% chance. Wind will be moderate, blowing around 15mph on average and gusts of 19.1mph at 6 PM. High humidity with average of 82% is anticipated, the maximum being 90% at 11 PM and 71% being its lowest at 11 AM. Barometric pressure is its highest of 30.01inHg at 12 AM, a lowest point of 29.93inHg at 7 PM with an avg 29.97inHg.
- HI: 64°F
- LO: 58°F
- Rainfall: 13%
- Snowfall: 0%
- Wind
15 mph - Humidity
82% avg. - UV Index
6.8 - Air QualityGood
- Sunrise
06:55 AM - Sunset
07:11 PM - Moonrise
03:46 PM - Moonset
12:07 AM - Moon Phase
First Quarter
Scattered Showers
Sun 9-20-26
Scattered Showers with a high of 61°F and a low of 58°F. There's a moderate 34% chance of rainfall with an estimated 0.01in. Wind will be moderate, blowing around 17mph on average and gusts of 19.3mph at 5 PM. High humidity with average of 84% is anticipated, the maximum being 89% at 12 AM and 78% being its lowest at 1 PM. Barometric pressure is its highest of 29.97inHg at 12 PM, a lowest point of 29.92inHg at 7 PM with an avg 29.94inHg.
- HI: 61°F
- LO: 58°F
- Rainfall: 34% | est. 0.01in
- Snowfall: 0%
- Wind
16.1 mph - Humidity
84% avg. - UV Index
5.5 - Air QualityGood
- Sunrise
06:55 AM - Sunset
07:10 PM - Moonrise
04:24 PM - Moonset
01:06 AM - Moon Phase
Waxing Gibbous
Scattered Showers
Mon 9-21-26
Scattered Showers with a high of 63°F and a low of 59°F. There might be light rainfall having a 24% chance with an estimated 0.01in. Wind will be moderate, blowing around 15mph on average and gusts of 17.5mph at 1 AM. The humidity will be on the higher side, averaging about 80%, the maximum being 86% at 9 PM and 73% being its lowest at 3 PM. Barometric pressure is its highest of 29.95inHg at 9 AM, a lowest point of 29.89inHg at 5 PM with an avg 29.92inHg.
- HI: 63°F
- LO: 59°F
- Rainfall: 24% | est. 0.01in
- Snowfall: 0%
- Wind
14.8 mph - Humidity
80% avg. - UV Index
6.1 - Air QualityGood
- Sunrise
06:56 AM - Sunset
07:08 PM - Moonrise
04:56 PM - Moonset
02:06 AM - Moon Phase
Waxing Gibbous
Sunny
Tue 9-22-26
Sunny with a high of 66°F and a low of 59°F. There might be light rainfall having a 13% chance. Wind will be moderate, blowing around 11mph on average and gusts of 19.9mph at 2 PM. The humidity will be on the higher side, averaging about 80%, the maximum being 88% at 3 AM and 69% being its lowest at 11 AM. Barometric pressure is its highest of 29.92inHg at 8 AM, a lowest point of 29.85inHg at 5 PM with an avg 29.88inHg.
- HI: 66°F
- LO: 59°F
- Rainfall: 13%
- Snowfall: 0%
- Wind
10.1 mph - Humidity
80% avg. - UV Index
5 - Air QualityGood
- Sunrise
06:57 AM - Sunset
07:07 PM - Moonrise
05:23 PM - Moonset
03:07 AM - Moon Phase
Waxing Gibbous
Overcast
Wed 9-23-26
Overcast with a high of 70°F and a low of 60°F. There might be light rainfall having a 19% chance. Winds will be light at 10mph and gusts of 15.4mph at 2 PM. The humidity will be on the higher side, averaging about 73%, the maximum being 85% at 3 AM and 56% being its lowest at 2 PM. Barometric pressure is its highest of 29.89inHg at 10 AM, a lowest point of 29.84inHg at 5 PM with an avg 29.86inHg.
- HI: 70°F
- LO: 60°F
- Rainfall: 19%
- Snowfall: 0%
- Wind
9.2 mph - Humidity
73% avg. - UV Index
5 - Air QualityTBA
- Sunrise
06:58 AM - Sunset
07:05 PM - Moonrise
05:47 PM - Moonset
04:07 AM - Moon Phase
Waxing Gibbous
This 5-Day weather forecast is relevant for ZIP codes 94080, 94083, and 94099, accurately covering areas of South San Francisco, CA.
Currently
 |
60°F |
30.08 inHg.
Barometer 84%
Humidity W 5.4 mph Wind |
| Clear | ||
National Outlook
More Flash Flooding Expected in the Southwest and Plains: 09-17 to 09-19
Thu Sep 17th 2026, 5:06am PDT
Read
Rain and Storms Hit Midwest and East, Monsoon in the South 09-19 to 09-23
Extended Forecast
Thu Sep 17th 2026, 5:10am PDT
Read
Thu Sep 17th 2026, 5:10am PDT
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