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

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Highlights
- Atherton has 44.3% less rainy days than Portola Valley.
- Atherton has 0.4% less Sunny Days than Portola Valley.
- On the BestPlaces comfort index, Atherton scores 3.6% better than Portola Valley
 Portola Valley, CAAtherton, CAUnited States
 Rainfall  Unlock1738
 Snowfall0  Unlock28
 Precipitation  Unlock61106
 Sunny262  Unlock205
 Avg. July High  Unlock8086
 Avg. Jan. Low41  Unlock22
 Comfort Index (higher=better)  Unlock8.77
 UV Index4.9  Unlock4.3
 Elevation  Unlock592443
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