NWS, American, European side by side around San Marcos and nearby towns.Live rain radar →
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Next 14 hours
consensus of the three models
7-day forecast
where the models agree, and where they split
San Marcos, CA is at its warmest in Jul (average highs near 84°F) and coldest in Jan (lows around 42°F), with roughly 24 in of precipitation across the year. Below, compare what NWS, American, European forecast for San Marcos right now, and see exactly where they disagree.
San Marcos climate by month
average daytime high and overnight low across a typical year
Jan
61°
42°
Feb
60°
42°
Mar
61°
45°
Apr
66°
48°
May
68°
53°
Jun
75°
57°
Jul
84°
62°
Aug
84°
63°
Sep
80°
62°
Oct
80°
56°
Nov
72°
48°
Dec
68°
46°
Common questions
What's the weather in San Marcos today?
On this page we show what NWS, American, European each forecast for San Marcos today, side by side and updated live. When all three agree the forecast is reliable; when they split, we flag it so you know the day is genuinely less certain.
Will it rain in San Marcos today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for San Marcos and flag the days where the models disagree on whether showers actually arrive, which is exactly when a single app can catch you out.
Which forecast is most accurate for San Marcos?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the San Marcos forecast is reliable, and when they split you should expect surprises. See our tested US accuracy scoreboard for how the models compare.
What is the warmest month in San Marcos?
Jul is typically the warmest month in San Marcos, with average highs around 84°F.
How cold does San Marcos get?
The coldest month in San Marcos is Jan, when overnight lows average about 42°F.
How much rain does San Marcos get?
San Marcos sees roughly 24 in of precipitation a year, with Jan usually the wettest month.
The forecasts Americans check
The two biggest apps keep their model a secret, so we can't show their numbers, only link you to them. The National Weather Service is public, so its data sits right in the comparison above.