2026 Compare Cities Climate:
Rancho Santa Margarita, CA vs Altadena, CA

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Highlights
- Altadena has 63.0% more rainy days than Rancho Santa Margarita.
- Altadena has 2.9% more Sunny Days than Rancho Santa Margarita.
- On the BestPlaces comfort index, Altadena scores 2.2% better than Rancho Santa Margarita
 Rancho Santa Margarita, CAAltadena, CAUnited States
 Rainfall  Unlock2338
 Snowfall0  Unlock28
 Precipitation  Unlock37106
 Sunny279  Unlock205
 Avg. July High  Unlock8686
 Avg. Jan. Low43  Unlock22
 Comfort Index (higher=better)  Unlock9.17
 UV Index5.9  Unlock4.3
 Elevation  Unlock13582443
Reviews for Rancho Santa Margarita    13 Reviews

This page provides little information on RSM. I see they keep describing the area as "outside of Los Angeles." Culturally, it is so far from Los Angeles (I lived in LA,  More

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Over 11 years ago

The weather here is amazing. We get a few hot days in the summer but it cools down in the evening. I love being able to sleep with the windows  More

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This is the best place to live in South Orange County with mild temperatures, low crime, great schools and family orientated. RSM is a city that sits in a pocket backing  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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