San Marcos, CA Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for San Marcos, CA.

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Current Conditions — San Marcos, CA

OCEANSIDE (KOKB)

Clear

NULL F
Humidity:%
Wind Speed: 0.0 mph
Barometer:29.96 in
Dewpoint:51.1 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 23 2026, 09:52 PM PDT
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5-Day Forecast — San Marcos, CA

Friday

High 73 °F
Forecast Missing
Friday
Night
Low 55 °F
Forecast Missing
Saturday

High 66 °F
Forecast Missing
Saturday
Night
Low 53 °F
Forecast Missing
Sunday

High 66 °F
Forecast Missing
Sunday
Night
Low 53 °F
Forecast Missing
Monday

High 71 °F
Forecast Missing
Monday
Night
Low 50 °F
Forecast Missing
Tuesday

High 73 °F
Forecast Missing

Detailed Forecast — San Marcos, CA

Friday
Forecast Missing. High near 73°F. Wind 6 to 12 mph, with gusts as high as 18 mph.
Friday Night
Forecast Missing. Low around 55°F. Wind 6 to 7 mph, with gusts as high as 13 mph.
Saturday
Forecast Missing. High near 66°F. Wind 7 to 13 mph, with gusts as high as 21 mph.
Saturday Night
Forecast Missing. Low around 53°F. Wind 7 to 10 mph, with gusts as high as 18 mph.
Sunday
Forecast Missing. High near 66°F. Wind 7 to 12 mph, with gusts as high as 20 mph.
Sunday Night
Forecast Missing. Low around 53°F. Wind 2 to 3 mph, with gusts as high as 8 mph.
Monday
Forecast Missing. High near 71°F. Wind 5 to 9 mph, with gusts as high as 17 mph.
Monday Night
Forecast Missing. Low around 50°F. Wind 2 to 3 mph, with gusts as high as 7 mph.
Tuesday
Forecast Missing. High near 73°F. Wind 6 to 9 mph, with gusts as high as 17 mph.
Tuesday Night
Forecast Missing. Low around 53°F. Wind 3 to 5 mph, with gusts as high as 8 mph.
Wednesday
Forecast Missing. High near 71°F. Wind 7 to 8 mph, with gusts as high as 17 mph.
Wednesday Night
Forecast Missing. Low around 55°F. Wind 2 to 3 mph, with gusts as high as 6 mph.
Thursday
Forecast Missing. High near 73°F. Wind 5 to 7 mph, with gusts as high as 14 mph.
CA Radar
Current Radar • CA
Day 1 Outlook • April 24, 2026

Observation History — San Marcos, CA

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
09:52 PM PDT 0.0 10.00 Clear -- NULL 51.1 % NA NA 29.96 1014.6
08:52 PM PDT 0.0 10.00 Clear -- 57.9 53.1 84% NA NA 29.94 1013.6
08:35 PM PDT 0.0 10.00 Clear -- 59.0 53.6 82% NA NA 29.93 1013.5
08:25 PM PDT 0.0 10.00 Clear -- 62.6 55.4 77% NA NA 29.92 1013.2
08:20 PM PDT 0.0 10.00 Clear -- 60.8 55.4 82% NA NA 29.92 1013.2
08:15 PM PDT 0.0 10.00 Clear -- 60.8 55.4 82% NA NA 29.92 1013.2
08:10 PM PDT 3.4 10.00 Clear -- 62.6 55.4 77% NA NA 29.92 1013.2
08:05 PM PDT 5.7 10.00 Clear -- 62.6 55.4 77% NA NA 29.92 1013.2
08:00 PM PDT SW 6.9 10.00 Clear -- 62.6 55.4 77% NA NA 29.92 1013.2
07:50 PM PDT 5.7 10.00 Clear -- 62.6 55.4 77% NA NA 29.92 1013.2
07:40 PM PDT 6.9 10.00 Clear -- 62.6 55.4 77% NA NA 29.92 1013.2
07:35 PM PDT 6.9 10.00 Clear -- 62.6 55.4 77% NA NA 29.92 1013.2
07:30 PM PDT 8.1 10.00 Clear -- 62.6 55.4 77% NA NA 29.91 1012.9
07:20 PM PDT W 6.9 10.00 Clear -- 62.6 55.4 77% NA NA 29.91 1012.9
07:15 PM PDT W 9.2 10.00 Clear -- 64.4 55.4 73% NA NA 29.91 1012.9
07:10 PM PDT 9.2 10.00 Clear -- 64.4 55.4 73% NA NA 29.91 1012.9
06:50 PM PDT W 8.1 10.00 Clear -- 64.4 53.6 68% NA NA 29.91 1012.9
06:45 PM PDT 9.2 10.00 Clear -- 64.4 53.6 68% NA NA 29.91 1012.9
06:40 PM PDT W 8.1 10.00 Clear -- 64.4 53.6 68% NA NA 29.90 1012.5
06:35 PM PDT 9.2 10.00 Clear -- 64.4 53.6 68% NA NA 29.90 1012.5
06:30 PM PDT 11.5 10.00 Clear -- 66.2 53.6 64% NA NA 29.90 1012.5
06:25 PM PDT 11.5 10.00 Clear -- 66.2 53.6 64% NA NA 29.90 1012.5
06:20 PM PDT 11.5 10.00 Clear -- 66.2 53.6 64% NA NA 29.90 1012.5
06:10 PM PDT 11.5 10.00 Clear -- 66.2 53.6 64% NA NA 29.90 1012.5

Regional Weather Observation

OCEANSIDE (KOKB)

Clear
NULL F

CAMP PENDLETON (KNFG)

Mostly Clear
55.0 F

CARLSBAD (KCRQ)

Clear
62.6 F

FALLBROOK AIRPAR (KL18)

Clear
NULL F

MURRIETA/TEMECUL (KF70)

Clear
57.2 F

HEMET (KHMT)

Clear
NULL F
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