2025 Compare Cities Climate:
South San Francisco, CA vs Altadena, CA

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Highlights
- Altadena has 3.7% more rainy days than South San Francisco.
- Altadena has 10.8% more Sunny Days than South San Francisco.
- On the BestPlaces comfort index, Altadena scores 8.3% better than South San Francisco
 South San Francisco, CAAltadena, CAUnited States
 Rainfall  Unlock2338
 Snowfall0  Unlock28
 Precipitation  Unlock37106
 Sunny259  Unlock205
 Avg. July High  Unlock8686
 Avg. Jan. Low45  Unlock22
 Comfort Index (higher=better)  Unlock9.17
 UV Index4.9  Unlock4.3
 Elevation  Unlock13582443
Reviews for South San Francisco    5 Reviews

It's amazing, but many, many people, including people who live in SF, think that SSF is just a part of SF. Not true. We're right across the highway from SFO, which is  More

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Over 17 years ago

One frustrating thing about South City weather is the number of overcast & foggy days, as compared to other nearby cities on the Peninsula. You can literally look  More

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Over 19 years ago

Been living in bayview hunters point for about 12 years now. What I can say that it's a rough place to live, no one cares about us and the mayor of San Francisco  More

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Reviews for Altadena    1 Reviews

I live just above the 1500 foot elevation at the edge of the San Gabriel Mountains in the L.A. suburb of Altadena--just above Pasadena. We're above the low morning fog  More

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