San Luis Obispo, CA weather and climate in 2025
Day
27 °C
Night
12 °C
Sea
15 °C
Precipitation
3 mm
in month
Rainy days
1 days
in month
Daylight
13 hours
average
Sunshine
10 hours
average
Humidity
73 %
Day
27 °C
Night
12 °C
Sea
15 °C
Precipitation
3 mm
in month
Rainy days
1 days
in month
Daylight
13 hours
average
Sunshine
10 hours
average
Humidity
73 %
Overview: San Luis Obispo, CA
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Weather overview for San Luis Obispo, CA
Weather overview
San Luis Obispo in California is characterized by a Mediterranean climate with mild, wet winters and warm, mostly dry summers. Throughout the year, you will find agreeable temperatures ranging from an average high of 18 °C (64 °F) in January to a delightful 27 °C (80 °F) in August. With predominance in dry weather, the wettest times are the winter months, where January brings in about 118 mm (4.65 in) of precipitation. On sunny days, which are frequent due to 58 hours of sunshine in January, the cool ocean breezes contribute to the overall pleasant weather conditions. Temperature swings between day and night are modest, making this coastal town a comfortable place year-round for residents and visitors alike.
January weather
January in San Luis Obispo welcomes the new year with mild temperatures averaging 18 °C (64 °F) during the day and cooling down to around 6 °C (42 °F) at night. Winter rains contribute to the majority of the annual precipitation, with 118 mm (4.65 in) and 8 days of wet days making it the prime month for rainfall.
February weather
As February unfolds, the chill in San Luis Obispo begins to wane slightly, with daytime temperatures rising to 18 °C (64 °F) while nights remain brisk at 6 °C (44 °F). The frequency of rainy days is still notable, averaging 8 days, but the rainfall is slightly less at 112 mm (4.42 in).
March weather
March in San Luis Obispo shows signs of spring as temperatures continue to increase, reaching an average daily high of 19 °C (66 °F). The nighttime temperature is 7 °C (45 °F), perfect for a light jacket. Rain showers occur less frequently, with precipitation averaging 94 mm (3.72 in) over 8 days.
April weather
April sees a consistent rise in temperatures, reflecting the heart of springtime in San Luis Obispo. Daytime warmth reaches an enjoyable 21 °C (69 °F), while nighttime temperatures are a mild 8 °C (46 °F). With the rainy season waning, the month receives a lower rainfall of 36 mm (1.41 in) across 5 days.
May weather
The onset of May in San Luis Obispo marks a transition towards drier and warmer weather. The average high temperature ascends to 22 °C (72 °F), offering ideal conditions for outdoor pursuits, while average rainfall drops to a scant 13 mm (0.51 in) over just 3 days.
June weather
June's arrival heralds the beginning of summer in San Luis Obispo, with its long sunny days awaiting. Daytime temperatures soar to an average of 25 °C (76 °F) while cool sea breezes offer relief from the minimal humidity in the evenings, with low temperatures around 11 °C (52 °F).
July weather
July in San Luis Obispo offers the full summer experience, with daily temperatures peaking around 26 °C (79 °F). The dry season is in full swing; rain is almost nonexistent with an average of only 2 mm (0.08 in) rainfall.
August weather
August sees the year's peak temperatures, averaging 27 °C (80 °F) during the day. The dry season continues with almost no rainfall, and the mild evenings averaging 12 °C (54 °F) invite you to enjoy the town's vibrant nightlife without the need for heavy layers.
September weather
As September rolls in, the high temperatures in San Luis Obispo start to slightly recede, yet remain quite warm at approximately 26 °C (80 °F) during the sunny days. Nighttime temps edge back to a comfortable 12 °C (53 °F), and the dry conditions persist, with a very slight increase in precipitation to 8 mm (0.30 in).
October weather
October in San Luis Obispo reveals the early signs of fall, with decreasing temperatures averaging a high of 24 °C (76 °F) during the day. Evening temperatures are more notable for their crispness, falling to an average of 10 °C (51 °F). The prospect of rain increases slightly with 25 mm (0.99 in) expected.
November weather
November sees a more pronounced shift towards cooler weather in San Luis Obispo. Day temperatures average around 21 °C (70 °F) with a noticeable dip at night to 8 °C (46 °F). The autumn rainfall pattern begins to show with an increase to 52 mm (2.04 in) over approximately 6 days.
December weather
December in San Luis Obispo marks the onset of winter, with temperatures reaching a daytime average of 18 °C (64 °F). The coolness deepens after sunset with an average low of 5 °C (41 °F). Infrequent rains are typical for this month, with a total of 89 mm (3.52 in) and about 7 days expected to be wet.
FAQs
How often does it rain in San Luis Obispo in January?
Rain is fairly common in January, with an average of 8 days experiencing some form of precipitation. This month is expected to be the wettest with around 118 mm (4.65 in) of rainfall.
Should I expect many rainy days in San Luis Obispo during February?
Though the worst is likely behind us after January, February still sees its fair share of rain with 8 days expected to be wet, amounting to 112 mm (4.42 in) of rainfall.
What is the weather typically like in San Luis Obispo during March?
March heralds the onset of spring with a pleasant 19 °C (66 °F) during the day. The windy conditions, with an average wind speed of 4 m/s, might require a light windbreaker during your ventures.
How much does it rain in San Luis Obispo in April?
Rain becomes increasingly scarce in April, with only about 36 mm (1.41 in) of rainfall over 5 days. Light showers are still possible but much less likely than in the preceding months.
Is May a rainy month in San Luis Obispo?
May is decidedly dry in San Luis Obispo, with a minimal average rainfall of 13 mm (0.51 in) and just about 3 days likely to experience any wet weather.
Can I expect many sunny hours in San Luis Obispo in June?
Sunshine is plentiful in June, averaging about 11 hours of sun per day, promoting an array of outdoor activities under the clear California sky.
How often does it rain in San Luis Obispo in July?
Rain is a rare occurrence in July, with typically only 1 day of rainfall throughout the whole month, accumulating a mere 2 mm (0.08 in).
Is August usually the warmest month in San Luis Obispo?
Indeed, August traditionally holds the torch as the warmest month, with a steady average high of 27 °C (80 °F) - a testament to the Californian summer.
Is September still considered a summery month in San Luis Obispo?
Summer lingers in September with an ambiance that continues to be predominantly sunny and warm, offering plenty of opportunities to enjoy the outdoors.
Does the weather in San Luis Obispo change significantly in October?
The change in weather is perceptible as October ushers in cooler temperatures, especially at night, but days remain comfortably warm, reflecting the temperate nature of the region.
How does November weather in San Luis Obispo compare to other months?
As we progress through November, the climate cools compared to the preceding months, signaling the approach of winter while daytime temperatures are still moderate.
Is December very wet in San Luis Obispo?
December is not particularly wet, but it does herald the start of the wetter season with a moderate amount of rain compared to the summer months, making it relatively wet.
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