Climate and monthly weather forecast
San Luis Obispo, CA

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Beautiful blue water surrounded by scenic mountain ranges at the San Luis Obispo, California
Beautiful blue water surrounded by scenic mountain ranges at the San Luis Obispo, California

Weather in January

January in San Luis Obispo, California, is a refreshing winter month, with an average temperature ranging between max 62.4°F (16.9°C) and min 46.9°F (8.3°C). January welcomes an average high-temperature of a comfortable 62.4°F (16.9°C), not much different from the preceding month. Weather in January »

Weather in February

The last month of the winter, February, is another refreshing month in San Luis Obispo, California, with an average temperature ranging between max 62.2°F (16.8°C) and min 45.7°F (7.6°C). The shift into February records an average high-temperature of a still refreshing 62.2°F (16.8°C), subtly varied from January's 62.4°F (16.9°C). Weather in February »

Weather in March

March, the first month of the spring in San Luis Obispo, is also an enjoyable month, with an average temperature ranging between max 64°F (17.8°C) and min 46.4°F (8°C). February's transformation into March witnesses an average high-temperature of a still comfortable 64°F (17.8°C), noting a minor change from the preceding month. Weather in March »

Weather in April

April, the same as March, is another enjoyable spring month in San Luis Obispo, California, with temperature in the range of an average low of 48.2°F (9°C) and an average high of 67.8°F (19.9°C). As San Luis Obispo welcomes April, the average high-temperature is noted at a still enjoyable 67.8°F (19.9°C), closely aligning with the preceding month. Weather in April »

Weather in May

May, the last month of the spring in San Luis Obispo, is an agreeable month, with an average temperature varying between 51.4°F (10.8°C) and 71.2°F (21.8°C). In May, San Luis Obispo experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 67.8°F (19.9°C) in April to a pleasant 71.2°F (21.8°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in San Luis Obispo, California, with temperature in the range of an average low of 55°F (12.8°C) and an average high of 76.6°F (24.8°C). As May transitions into June, a subtle temperature shift is observed, with average highs adjusting from an agreeable 71.2°F (21.8°C) to a warm 76.6°F (24.8°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in San Luis Obispo, California, with temperature in the range of an average low of 58.8°F (14.9°C) and an average high of 80.1°F (26.7°C). The commencement of July introduces an average high-temperature of a still warm 80.1°F (26.7°C), closely mirroring the preceding month. Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in San Luis Obispo, California, with an average temperature varying between 80.2°F (26.8°C) and 59.5°F (15.3°C). With average temperatures fluctuating between a high of 80.2°F (26.8°C) and a low of 59.5°F (15.3°C), August stands out as the warmest month. Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in San Luis Obispo, California, with an average temperature varying between 79.9°F (26.6°C) and 60.3°F (15.7°C). The advent of September presents an average high-temperature of a still moderately hot 79.9°F (26.6°C), maintaining a close correlation with the preceding month. Weather in September »

Weather in October

October, like September, in San Luis Obispo, California, is another warm autumn month, with temperature in the range of an average low of 56.5°F (13.6°C) and an average high of 74.3°F (23.5°C). San Luis Obispo's weather subtly changes with the onset of October, barely falling from 79.9°F (26.6°C) in September to a still moderately hot 74.3°F (23.5°C). Weather in October »

Weather in November

November, the last month of the autumn in San Luis Obispo, is also an enjoyable month, with an average temperature fluctuating between 51.3°F (10.7°C) and 67.1°F (19.5°C). The shift from October to November includes a minor decrease in the average high-temperature, lightly dropping from a moderately hot 74.3°F (23.5°C) to a comfortable 67.1°F (19.5°C). Weather in November »

Weather in December

The first month of the winter, December, is still a refreshing month in San Luis Obispo, California, with an average temperature fluctuating between 60.3°F (15.7°C) and 46.2°F (7.9°C). The lowest temperatures are recorded in December, with averages reaching a high of 60.3°F (15.7°C) and a low of 46.2°F (7.9°C). Weather in December »
Updated: Jul 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How much does it rain?

Throughout the year, there are 57 rainfall days, and 9.57" (243mm) of precipitation is accumulated.

What are the months with the least sunshine?

February and December, with an average of 6.5h of sunshine, are months with the least sunshine.

When is the lowest UV index?

February is the month with the lowest UV index, with an average maximum UV index of 3.

What is the most humid month?

The most humid month is March, with an average relative humidity of 69%.

What is the rainiest month in San Luis Obispo?

March is the month with the most rainfall. Rain falls for 10.5 days and accumulates 2.01" (51mm) of precipitation.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.

What is the driest month?

The months with the least rainfall are June and August Rain falls for 1.1 days and accumulates 0.04" (1mm) of rain.

When are the longest days?

The month with the longest days is June, with an average of 14h and 30min of daylight.

What are the months with the most sunshine?

June through August, with an average of 12h of sunshine, are months with the most sunshine.

When is the highest UV index?

The months with the highest UV index are June and August, with an average maximum UV index of 6.

What time of the year is the hottest?

San Luis Obispo's temperatures tend to reach their peak averages in August, with a high of 80.2°F (26.8°C) and a low of 59.5°F (15.3°C).

What are the least humid months?

The months with the lowest humidity in San Luis Obispo are September and October, with an average relative humidity of 57%.

What month is the coldest?

With average high and low temperatures of 60.3°F (15.7°C) and 46.2°F (7.9°C) respectively, December is San Luis Obispo's coldest month.

What is the month with the shortest days?

With an average of 9h and 48min of daylight, December has the shortest days of the year.

Average temperature
San Luis Obispo, CA

Average temperature - San Luis Obispo, CA

The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (60.3°F).

The month with the highest average low temperature is September (60.3°F).
The coldest month (with the lowest average low temperature) is February (45.7°F).

Average pressure
San Luis Obispo, CA

Average pressure - San Luis Obispo, CA

The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).

Average wind speed
San Luis Obispo, CA

Average wind speed - San Luis Obispo, CA

The windiest months (with the highest average wind speed) are April and May (6.8mph).
The calmest months (with the lowest average wind speed) are August and September (5.3mph).

Average humidity
San Luis Obispo, CA

Average humidity - San Luis Obispo, CA

The month with the highest relative humidity is March (69%).
The months with the lowest relative humidity are September and October (57%).

Average rainfall
San Luis Obispo, CA

Average rainfall - San Luis Obispo, CA

The wettest month (with the highest rainfall) is March (2.01").
The driest months (with the least rainfall) are June and August (0.04").

Average rainfall days
San Luis Obispo, CA

Average rainfall days - San Luis Obispo, CA

The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is August (0.6 days).

Average daylight / Average sunshine
San Luis Obispo, CA

Average daylight / Average sunshine - San Luis Obispo, CA

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

The months with the most sunshine are June, July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are February and December (Average sunshine: 6h and 30min).

Average sunshine days
San Luis Obispo, CA

Average sunshine days - San Luis Obispo, CA

The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is February (19.1 days).

Average visibility
San Luis Obispo, CA

Average visibility - San Luis Obispo, CA

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

San Luis Obispo, California, USA

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