San Marcos, California Weather Forecast
Today in San Marcos: clear skies with a high near 88°F and a low around 61°F. Rain chance 0%. Best chance of rain is Wednesday at 56%. Highs run 67 to 91°F through Wednesday.
Forecast updated 1:05 PM PDT, Oct 15
Active Weather Alerts
7-Day Forecast for San Marcos
Today 10/15
88°/61°
0%
Fri 10/16
91°/67°
3%
Sat 10/17
87°/71°
3%
Sun 10/18
86°/65°
0%
Mon 10/19
81°/65°
1%
Tue 10/20
71°/61°
30%
Wed 10/21
67°/59°
56%
Next 24 Hours
| Now | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | Fri12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sky | | | | | | | |  | | | | | | | | | | | | | | | | |
| Temp | 87° | 88° | 88° | 86° | 85° | 81° | 77° | 74° | 72° | 70° | 69° | 68° | 68° | 68° | 68° | 68° | 68° | 67° | 67° | 70° | 77° | 83° | 88° | 90° |
| Rain | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 1% | 1% | 2% | 3% |
| Wind | NNE 5 | NE 6 | NNE 6 | NE 6 | ENE 5 | ENE 4 | ENE 5 | N 7 | N 10 | N 10 | N 10 | N 9 | NNE 9 | N 8 | NNE 8 | NE 9 | NE 9 | NE 10 | E 10 | E 11 | E 14 | E 18 | E 20 | E 21 |
Growing Conditions
Growing degree days
3,882
since Apr 1, base 50°F
Rain, last 30 days
2.08 in
model analysis
Rain, year to date
8.90 in
since Jan 1
2-inch soil temperature
64°F
yesterday, daily average
Reference ET, last 7 days
0.91 in
FAO-56 grass reference
Through Oct 14. Season totals use model analysis for this point and update every morning.
Soil, ET and spray tools for San Marcos →
Current Stats & Observations
NWS Forecast
About San Marcos Weather
San Marcos sits at about 571 feet above sea level in San Diego County, California. About 96,664 people live in the San Marcos area. Official forecasts and warnings for the area come from the National Weather Service SGX office, and the nearest NEXRAD radar site is KNKX. The city is in USDA plant hardiness zone 10a, where the coldest winter night typically falls between 30 to 35°F.
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