San Marcos, California Climate
United States
Pop. 92,931 Elev. 177 m / 581 ft
TZ: America/Los_Angeles (UTC-7) ·
San Marcos is largely arid, with warm summers peaking at 82°F (28°C) in August and cool winters around 45°F (7°C) in January. Humidity pushes the summer feels-like temperature to around 87°F (31°C). Precipitation occurs on roughly 24 days per year (16.6 in / 421 mm total). The city averages 179 sunny days per year. Ocean water temperatures reach 73°F (23°C) in summer.
| Temperature | 82°F (28°C) high | 45°F (7°C) low |
| Feels like | 87°F (30°C) high | 45°F (7°C) low |
| Rain | 24 days | 16.6 in (421 mm) /yr |
| Sky | 179 sunny | 12 stormy |
| Wind | 2.3 mph (1.0 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Jan, Apr, May, Jun, Jul, Aug, Sep, Oct
Sky & Air by Month
Cloud cover (%)
36
Jan 56
Feb 54
Mar 46
Apr 57
May 46
Jun 35
Jul 27
Aug 37
Sep 29
Oct 47
Nov 41
Dec Humidity (%)
43
Jan 71
Feb 73
Mar 70
Apr 72
May 72
Jun 72
Jul 69
Aug 72
Sep 68
Oct 69
Nov 66
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 7 mi McClellan-Palomar Airport (CLD)
Ski resort 55 mi Adventure Center
National park 9 mi South Carlsbad State Beach
Mountain peak
(5,417 ft) 19 mi Boucher Hill
Hospital 1 mi Kaiser Permanente San Marcos Medical Center
Hiking trail 5 mi Switchbacks Trail
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 66°F 19°C | 45°F 7°C | 0.8 in 19 mm | — | 16 |
| February | 67°F 20°C | 50°F 10°C | 2.3 in 59 mm | — | 8 |
| March | 63°F 17°C | 50°F 10°C | 3.8 in 97 mm | — | 12 |
| April | 66°F 19°C | 52°F 11°C | 0.8 in 19 mm | — | 11 |
| May | 72°F 22°C | 58°F 14°C | 0.6 in 14 mm | — | 10 |
| June | 76°F 24°C | 61°F 16°C | 0.1 in 2 mm | — | 10 |
| July | 78°F 25°C | 63°F 17°C | 0.1 in 2 mm | — | 18 |
| August | 82°F 28°C | 66°F 19°C | 0.1 in 4 mm | — | 24 |
| September | 80°F 27°C | 67°F 19°C | 0.6 in 15 mm | — | 18 |
| October | 75°F 24°C | 58°F 15°C | 1.0 in 25 mm | — | 20 |
| November | 71°F 22°C | 55°F 13°C | 4.2 in 105 mm | — | 17 |
| December | 70°F 21°C | 51°F 11°C | 2.4 in 60 mm | — | 15 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 16 | 2 |
| February | 8 | 1 |
| March | 12 | 4 |
| April | 11 | 0 |
| May | 10 | 0 |
| June | 10 | 0 |
| July | 18 | 0 |
| August | 24 | 0 |
| September | 18 | 0 |
| October | 20 | 1 |
| November | 17 | 3 |
| December | 15 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 59°F 15°C | 54°F 12°C |
| February | 60°F 15°C | 54°F 12°C |
| March | 60°F 15°C | 56°F 13°C |
| April | 62°F 17°C | 60°F 16°C |
| May | 67°F 19°C | 65°F 18°C |
| June | 69°F 21°C | 71°F 22°C |
| July | 71°F 21°C | 74°F 23°C |
| August | 73°F 23°C | 77°F 25°C |
| September | 72°F 22°C | 77°F 25°C |
| October | 69°F 21°C | 71°F 22°C |
| November | 67°F 20°C | 65°F 19°C |
| December | 64°F 18°C | 59°F 15°C |