Monthly weather forecast and climate
San Marcos, CA

Weather in January

January, like December, in San Marcos, California, is another enjoyable winter month, with temperature in the range of an average high of 64.9°F (18.3°C) and an average low of 48.7°F (9.3°C). In January, the average high-temperature is essentially the same as in December - a still enjoyable 64.9°F (18.3°C). Weather in January »

Weather in February

The last month of the winter, February, is also an enjoyable month in San Marcos, California, with average temperature fluctuating between 63.3°F (17.4°C) and 48°F (8.9°C). February and December, with an average high-temperature of 63.3°F (17.4°C), are the coldest months. Weather in February »

Weather in March

March, the first month of the spring, in San Marcos, is still a comfortable month, with average temperature ranging between min 49.5°F (9.7°C) and max 65.8°F (18.8°C). In March, the average high-temperature is relatively the same as in February - a still enjoyable 65.8°F (18.8°C). Weather in March »

Weather in April

April in San Marcos, California, is an agreeable spring month, with average temperature fluctuating between 68.5°F (20.3°C) and 51.3°F (10.7°C). In April, the average high-temperature is practically the same as in March - an agreeable 68.5°F (20.3°C). Weather in April »

Weather in May

May, the last month of the spring, in San Marcos, is another pleasant month, with average temperature ranging between max 70.3°F (21.3°C) and min 53.6°F (12°C). In San Marcos, the average high-temperature in May is almost the same as in April - a still agreeable 70.3°F (21.3°C). Weather in May »

Weather in June

June, the first month of the summer, in San Marcos, is a warm month, with average temperature ranging between max 75.2°F (24°C) and min 56.5°F (13.6°C). In San Marcos, the average high-temperature is essentially the same as in May - a warm 75.2°F (24°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in San Marcos, California, with temperature in the range of an average high of 80.2°F (26.8°C) and an average low of 62.6°F (17°C). In July, the average high-temperature is almost the same as in June - a still moderately hot 80.2°F (26.8°C). Weather in July »

Weather in August

August, the last month of the summer, in San Marcos, is also a moderately hot month, with average temperature fluctuating between 64.2°F (17.9°C) and 81.9°F (27.7°C). The warmest month is August, with an average high-temperature of 81.9°F (27.7°C) and an average low-temperature of 64.2°F (17.9°C). In August, the average heat index is appraised at 84.7°F (29.3°C). Weather in August »

Weather in September

September, the first month of the autumn, in San Marcos, is also a moderately hot month, with average temperature ranging between min 63.3°F (17.4°C) and max 80.8°F (27.1°C). In September, the average high-temperature is almost the same as in August - a still warm 80.8°F (27.1°C). Weather in September »

Weather in October

October, the same as September, is another warm autumn month in San Marcos, California, with average temperature ranging between max 75.4°F (24.1°C) and min 58.8°F (14.9°C). In San Marcos, the average high-temperature marginally drops, from a warm 80.8°F (27.1°C) in September, to a still moderately hot 75.4°F (24.1°C). Weather in October »

Weather in November

The last month of the autumn, November, is another pleasant month in San Marcos, California, with temperature in the range of an average low of 54°F (12.2°C) and an average high of 69.4°F (20.8°C). In San Marcos, the average high-temperature in November marginally drops, from a moderately hot 75.4°F (24.1°C) in October, to a pleasant 69.4°F (20.8°C). Weather in November »

Weather in December

The first month of the winter, December, is still a comfortable month in San Marcos, California, with temperature in the range of an average high of 63.3°F (17.4°C) and an average low of 48.2°F (9°C). The coldest months are February and December, with an average high-temperature of 63.3°F (17.4°C). Weather in December »
[Resources]

FAQ

How much does it rain in San Marcos?

In San Marcos, during the entire year, the rain falls for 52.1 days and collects up to 6.1" (155mm) of precipitation.

When is the lowest UV index in San Marcos?

Months with the lowest UV index in San Marcos, California, are January through March, November and December, with an average maximum UV index of 4.

What is the coldest month in San Marcos?

The coldest months are February and December, with an average high-temperature of 63.3°F (17.4°C).

What is the most humid month in San Marcos?

The most humid month is May, with an average relative humidity of 70%.

What is the driest month in San Marcos?

June is the month with the least rainfall. Rain falls for 1.2 days and accumulates 0.08" (2mm) of precipitation.

When are the longest days in San Marcos?

The month with the longest days in San Marcos is June, with an average of 14.3h of daylight.

What are the months with the highest UV index in San Marcos?

June through September, with an average maximum UV index of 6, are months with the highest UV index.

What month has the most sunshine in San Marcos?

July has the most sunshine of the year in San Marcos, California, with an average of 12.1h of sunshine.

What is the warmest month in San Marcos?

August is the warmest month, with an average high-temperature of 81.9°F (27.7°C) and an average low-temperature of 64.2°F (17.9°C).

What is the least humid month in San Marcos?

The least humid month is November, with an average relative humidity of 56%.

What is the rainiest month in San Marcos?

December is the month with the most rainfall in San Marcos. Rain falls for 5.9 days and accumulates 1.22" (31mm) of precipitation.

What is the month with the shortest days in San Marcos?

With an average of 10h of daylight, December has the shortest days of the year in San Marcos, California.

What is the month with the least sunshine in San Marcos?

The month with the least sunshine is December, with an average of 6.8h of sunshine.

Average temperature
San Marcos, CA

Average temperature - San Marcos, CA

The warmest month (with the highest average high temperature) is August (81.9°F).
Months with the lowest average high temperature are February and December (63.3°F).

The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is February (48°F).

[Resources]

Average pressure
San Marcos, CA

Average pressure - San Marcos, CA

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.87").

[Resources]

Average wind speed
San Marcos, CA

Average wind speed - San Marcos, CA

The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is October (4.4mph).

[Resources]

Average rainfall
San Marcos, CA

Average rainfall - San Marcos, CA

The wettest month (with the highest rainfall) is December (1.22").
The driest month (with the least rainfall) is June (0.08").

[Resources]

Average rainfall days
San Marcos, CA

Average rainfall days - San Marcos, CA

The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (1.2 days).

[Resources]

Average daylight / Average sunshine
San Marcos, CA

Average daylight / Average sunshine - San Marcos, CA

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.8h).

[Resources]

Average sunshine days
San Marcos, CA

Average sunshine days - San Marcos, CA

The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is February (20 days).

[Resources]

Average UV index
San Marcos, CA

Average UV index - San Marcos, CA

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 4).

[Resources]

Average visibility
San Marcos, CA

Average visibility - San Marcos, CA

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

[Resources]