Castro Valley vs San Luis Obispo Climate
91%matchOn climate, San Luis Obispo is a 91% match for Castro Valley. Compared with Castro Valley, San Luis Obispo has the same summer highs and more sun.
Castro Valley gets 17 in (441 mm) of rain a year and San Luis Obispo 22 in (559 mm). Castro Valley's warmest month is September, at 81°F (27°C); San Luis Obispo's is August, at 80°F (27°C).
Climate fingerprints: ring color = average temperature, thickness = rain. January at the top.
Month by month
Highs and lows (°F)
Castro ValleySan Luis Obisposolid = high, dashed = low
Rain (in per month)
Castro ValleySan Luis Obispo
Monthly averages
| Month | High | Low | Rain | |||
|---|---|---|---|---|---|---|
| Castro Valley | San Luis Obispo | Castro Valley | San Luis Obispo | Castro Valley | San Luis Obispo | |
| Jan | 59°F(15°C) | 65°F(18°C) | 43°F(6°C) | 42°F(6°C) | 3.5 in(89 mm) | 5.0 in(127 mm) |
| Feb | 63°F(17°C) | 65°F(19°C) | 45°F(7°C) | 43°F(6°C) | 3.3 in(83 mm) | 4.7 in(119 mm) |
| Mar | 66°F(19°C) | 68°F(20°C) | 47°F(8°C) | 44°F(7°C) | 2.5 in(63 mm) | 3.6 in(91 mm) |
| Apr | 70°F(21°C) | 70°F(21°C) | 48°F(9°C) | 45°F(7°C) | 1.3 in(33 mm) | 1.4 in(36 mm) |
| May | 73°F(23°C) | 73°F(23°C) | 51°F(11°C) | 48°F(9°C) | 0.6 in(14 mm) | 0.5 in(13 mm) |
| Jun | 78°F(25°C) | 77°F(25°C) | 55°F(13°C) | 51°F(10°C) | 0.2 in(4 mm) | 0.0 in(1 mm) |
| Jul | 79°F(26°C) | 79°F(26°C) | 56°F(14°C) | 53°F(12°C) | 0.0 in(1 mm) | 0.0 in(1 mm) |
| Aug | 80°F(27°C) | 80°F(27°C) | 57°F(14°C) | 54°F(12°C) | 0.0 in(1 mm) | 0.0 in(1 mm) |
| Sep | 81°F(27°C) | 80°F(27°C) | 56°F(13°C) | 53°F(11°C) | 0.1 in(2 mm) | 0.1 in(2 mm) |
| Oct | 76°F(25°C) | 78°F(25°C) | 52°F(11°C) | 49°F(10°C) | 1.0 in(26 mm) | 1.1 in(27 mm) |
| Nov | 67°F(19°C) | 71°F(22°C) | 47°F(8°C) | 45°F(7°C) | 1.9 in(47 mm) | 1.6 in(41 mm) |
| Dec | 60°F(16°C) | 65°F(19°C) | 43°F(6°C) | 41°F(5°C) | 3.1 in(78 mm) | 3.9 in(100 mm) |
1991–2020 averages, by calendar month.