Climate and monthly weather forecastSan Marcos, CA
Climate and monthly weather forecast
Weather in January
January, like December, in San Marcos, California, is another refreshing winter month, with an average temperature varying between 64.9°F (18.3°C) and 48.7°F (9.3°C). January's presence records an average high-temperature of a still refreshing 64.9°F (18.3°C), closely mirroring December's climate. Weather in January »Weather in February
February, the last month of the winter in San Marcos, is another refreshing month, with an average temperature fluctuating between 63.3°F (17.4°C) and 48°F (8.9°C). The temperature hits its lowest levels in February and December, recording an average high-temperature of 63.3°F (17.4°C). Weather in February »Weather in March
The first month of the spring, March, is still a comfortable month in San Marcos, California, with temperature in the range of an average high of 65.8°F (18.8°C) and an average low of 49.5°F (9.7°C). The arrival of March brings an average high-temperature of a still comfortable 65.8°F (18.8°C), closely following the temperature pattern of February. Weather in March »Weather in April
April in San Marcos, California, is a pleasant spring month, with temperature in the range of an average low of 51.3°F (10.7°C) and an average high of 68.5°F (20.3°C). During April, San Marcos observes a subtle ascent to a pleasant 68.5°F (20.3°C) from March's 65.8°F (18.8°C) in the average high-temperature. Weather in April »Weather in May
May, the last month of the spring in San Marcos, is also an agreeable month, with an average temperature varying between 70.3°F (21.3°C) and 53.6°F (12°C). The advent of May presents an average high-temperature of a still agreeable 70.3°F (21.3°C), maintaining a close correlation with the preceding month. Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in San Marcos, California, with temperature in the range of an average low of 56.5°F (13.6°C) and an average high of 75.2°F (24°C). With the advent of June, San Marcos's high-temperatures adjust to a warm 75.2°F (24°C), closely aligning with the preceding month. Weather in June »Weather in July
July, like June, in San Marcos, California, is another warm summer month, with an average temperature fluctuating between 80.2°F (26.8°C) and 62.6°F (17°C). San Marcos measures an average high-temperature of a still warm 80.2°F (26.8°C) in July, nearly consistent with the preceding month. Weather in July »Weather in August
The last month of the summer, August, is another warm month in San Marcos, California, with an average temperature fluctuating between 64.2°F (17.9°C) and 81.9°F (27.7°C). The warmest period is August, when temperatures fluctuate between an average high of 81.9°F (27.7°C) and a low of 64.2°F (17.9°C). For most parts of August, the heat index is computed to be 84.2°F (29°C). Weather in August »Weather in September
September, the first month of the autumn in San Marcos, is still a warm month, with an average temperature varying between 63.3°F (17.4°C) and 80.8°F (27.1°C). With the onset of September, a modest change to a still warm 80.8°F (27.1°C) from August's 81.9°F (27.7°C) is noted in high-temperature. Weather in September »Weather in October
October, like September, in San Marcos, California, is another warm autumn month, with an average temperature fluctuating between 75.4°F (24.1°C) and 58.8°F (14.9°C). As September transitions into October, San Marcos sees a gentle drop in the average high-temperature, transitioning from 80.8°F (27.1°C) 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 an average temperature ranging between min 54°F (12.2°C) and max 69.4°F (20.8°C). November marks a gentle change in average high-temperature, declining from October's moderately hot 75.4°F (24.1°C) to a pleasant 69.4°F (20.8°C). Weather in November »Weather in December
The first month of the winter, December, is also an enjoyable 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). February and December are identified as the coldest months, with an average high-temperature of 63.3°F (17.4°C). Weather in December »Updated: Feb 9, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In San Marcos, California, during the entire year, the rain falls for 52.1 days and collects up to 6.1" (155mm) of precipitation.
January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index in San Marcos, California.
February and December, with an average high-temperature of 63.3°F (17.4°C), are the coldest months in San Marcos.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in San Marcos, California, 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.
May is the most humid month, with an average relative humidity of 70%.
The month with the least rainfall in San Marcos is June, when the rain falls for 1.2 days and typically collects 0.08" (2mm) of precipitation.
June has the longest days of the year in San Marcos, with an average of 14h and 18min of daylight.
June through September, with an average maximum UV index of 6, are months with the highest UV index in San Marcos, California.
The month with the most sunshine in San Marcos, California, is July, with an average of 12.1h of sunshine.
San Marcos's warmest weather arrives in August, when temperatures average a high of 81.9°F (27.7°C) and a low of 64.2°F (17.9°C).
With an average relative humidity of 56%, November is the least humid month in San Marcos.
December is the month with the most rainfall. Rain falls for 5.9 days and accumulates 1.22" (31mm) of precipitation.
The month with the shortest days in San Marcos is December, with an average of 10h and 0min of daylight.
With an average of 6.8h of sunshine, December has the least sunshine of the year in San Marcos, California.
Average temperature
San Marcos, CA
The warmest month (with the highest average high temperature) is August (81.9°F).
The 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).
Average pressure
San Marcos, CA
- Average pressure in January:
30.09"Hg - Average pressure in February:
30.04"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.91"Hg - Average pressure in June:
29.87"Hg
- Average pressure in July:
29.9"Hg - Average pressure in August:
29.88"Hg - Average pressure in September:
29.88"Hg - Average pressure in October:
29.93"Hg - Average pressure in November:
30.02"Hg - Average pressure in December:
30.06"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed
San Marcos, CA
- Average wind speed in January:
5mph - Average wind speed in February:
5.2mph - Average wind speed in March:
5.2mph - Average wind speed in April:
5.7mph - Average wind speed in May:
5.5mph - Average wind speed in June:
5mph
- Average wind speed in July:
4.8mph - Average wind speed in August:
4.7mph - Average wind speed in September:
4.5mph - Average wind speed in October:
4.4mph - Average wind speed in November:
4.8mph - Average wind speed in December:
5mph
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).
Average humidity
San Marcos, CA
The month with the highest relative humidity is May (70%).
The month with the lowest relative humidity is November (56%).
Average rainfall
San Marcos, CA
- Average rainfall in January:
0.59" - Average rainfall in February:
1.18" - Average rainfall in March:
0.75" - Average rainfall in April:
0.59" - Average rainfall in May:
0.35" - Average rainfall in June:
0.08"
- Average rainfall in July:
0.12" - Average rainfall in August:
0.12" - Average rainfall in September:
0.16" - Average rainfall in October:
0.2" - Average rainfall in November:
0.75" - Average rainfall in December:
1.22"
The wettest month (with the highest rainfall) is December (1.22").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days
San Marcos, CA
- Average rainfall days in January:
5 days - Average rainfall days in February:
6.3 days - Average rainfall days in March:
7.8 days - Average rainfall days in April:
6.3 days - Average rainfall days in May:
4.8 days - Average rainfall days in June:
1.2 days
- Average rainfall days in July:
2.5 days - Average rainfall days in August:
1.6 days - Average rainfall days in September:
2.7 days - Average rainfall days in October:
3.5 days - Average rainfall days in November:
4.5 days - Average rainfall days in December:
5.9 days
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).
Average daylight / Average sunshine
San Marcos, CA
- Average daylight in January:
10h and 18min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 0min - Average daylight in May:
13h and 54min - Average daylight in June:
14h and 18min
- Average daylight in July:
14h and 6min - Average daylight in August:
13h and 18min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 18min - Average daylight in November:
10h and 30min - Average daylight in December:
10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in January:
6h and 54min - Average sunshine in February:
6h and 54min - Average sunshine in March:
8h and 42min - Average sunshine in April:
11h and 0min - Average sunshine in May:
11h and 12min - Average sunshine in June:
12h and 0min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 24min - Average sunshine in October:
8h and 54min - Average sunshine in November:
7h and 12min - Average sunshine in December:
6h and 48min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days
San Marcos, CA
- Average sunshine days in January:
25 days - Average sunshine days in February:
20 days - Average sunshine days in March:
21.6 days - Average sunshine days in April:
21.8 days - Average sunshine days in May:
21.3 days - Average sunshine days in June:
22.8 days
- Average sunshine days in July:
24.5 days - Average sunshine days in August:
25.8 days - Average sunshine days in September:
25.3 days - Average sunshine days in October:
25 days - Average sunshine days in November:
23.4 days - Average sunshine days in December:
22.5 days
The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is February (20 days).
Average UV index
San Marcos, CA
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover
San Marcos, CA
The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility
San Marcos, 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).
