2025 Compare Cities Climate:
Atherton, CA vs Portola Valley, CA

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Highlights
- Portola Valley has 79.5% more rainy days than Atherton.
- Portola Valley has 0.4% more Sunny Days than Atherton.
- On the BestPlaces comfort index, Portola Valley scores 3.4% worse than Atherton
 Atherton, CAPortola Valley, CAUnited States
 Rainfall  Unlock3138
 Snowfall0  Unlock28
 Precipitation  Unlock73106
 Sunny261  Unlock205
 Avg. July High  Unlock7786
 Avg. Jan. Low41  Unlock22
 Comfort Index (higher=better)  Unlock8.47
 UV Index4.9  Unlock4.3
 Elevation  Unlock4592443
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