San Luis Obispo Climate by Month
San Luis Obispo, California, United States
Warm summers and cool winters, with most rain from December to March.
San Luis Obispo has warm summers and cool winters, with most rain from December to March. August is the warmest month, with highs around 80°F (27°C); January is the coolest at 65°F (18°C), and nights dip to 41°F (5°C). Of the 22 in (559 mm) of rain in a typical year, 78% falls from December to March. June to September are almost completely dry.
- Warmest month
- 80°F(27°C)
- Average high, August
- Coldest nights
- 41°F(5°C)
- Average low, December
- Rain per year
- 22 in(559 mm)
- Wettest: January
- Humidity
- 62%
- Sunniest: June
Best and worst months in San Luis Obispo
Best for weatherMay to July are the best time for weather in San Luis Obispo: highs near 76°F (25°C) and almost no rain.
Least pleasantJanuary and February are the least pleasant; January is the coldest, with highs of only 65°F (18°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in June.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Luis Obispo weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 65°F(18°C) | 42°F(6°C) | 5.0 in(127 mm) | 64% | 2.5 |
| FebFebruary | 65°F(19°C) | 43°F(6°C) | 4.7 in(119 mm) | 70% | 3.2 |
| MarMarch | 68°F(20°C) | 44°F(7°C) | 3.6 in(91 mm) | 66% | 4.6 |
| AprApril | 70°F(21°C) | 45°F(7°C) | 1.4 in(36 mm) | 62% | 6.0 |
| MayMayBest | 73°F(23°C) | 48°F(9°C) | 0.5 in(13 mm) | 61% | 6.8 |
| JunJuneBest | 77°F(25°C) | 51°F(10°C) | 0.0 in(1 mm) | 60% | 7.3 |
| JulJulyBest | 79°F(26°C) | 53°F(12°C) | 0.0 in(1 mm) | 64% | 7.1 |
| AugAugust | 80°F(27°C) | 54°F(12°C) | 0.0 in(1 mm) | 62% | 6.7 |
| SepSeptember | 80°F(27°C) | 53°F(11°C) | 0.1 in(2 mm) | 59% | 5.6 |
| OctOctober | 78°F(25°C) | 49°F(10°C) | 1.1 in(27 mm) | 55% | 4.2 |
| NovNovember | 71°F(22°C) | 45°F(7°C) | 1.6 in(41 mm) | 61% | 3.0 |
| DecDecember | 65°F(19°C) | 41°F(5°C) | 3.9 in(100 mm) | 65% | 2.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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