San Ysidro, CA Weather Forecast & Alerts

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

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Current Conditions — San Ysidro, CA

MIRAMAR NAS/SAN (KNKX)

Clear

61.0 F
Humidity:72%
Wind Speed:W 5.8 mph
Barometer:29.94 in
Dewpoint:52.0 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 23 2026, 07:55 PM PDT
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5-Day Forecast — San Ysidro, CA

Thursday

High 71 °F
Forecast Missing
Thursday
Night
Low 55 °F
Forecast Missing
Friday

High 69 °F
Forecast Missing
Friday
Night
Low 59 °F
Forecast Missing
Saturday

High 66 °F
Forecast Missing
Saturday
Night
Low 57 °F
Forecast Missing
Sunday

High 66 °F
Forecast Missing
Sunday
Night
Low 55 °F
Forecast Missing
Monday

High 68 °F
Forecast Missing

Detailed Forecast — San Ysidro, CA

Thursday
Forecast Missing. High near 71°F. Wind 8 to 12 mph, with gusts as high as 20 mph.
Thursday Night
Forecast Missing. Low around 55°F. Wind 1 to 3 mph, with gusts as high as 8 mph.
Friday
Forecast Missing. High near 69°F. Wind 3 to 12 mph, with gusts as high as 20 mph.
Friday Night
Forecast Missing. Low around 59°F. Wind 3 to 7 mph, with gusts as high as 13 mph.
Saturday
Forecast Missing. High near 66°F. Wind 6 to 13 mph, with gusts as high as 21 mph.
Saturday Night
Forecast Missing. Low around 57°F. Wind 9 to 12 mph, with gusts as high as 18 mph.
Sunday
Forecast Missing. High near 66°F. Wind 9 to 13 mph, with gusts as high as 21 mph.
Sunday Night
Forecast Missing. Low around 55°F. Wind 3 to 5 mph, with gusts as high as 8 mph.
Monday
Forecast Missing. High near 68°F. Wind 7 to 12 mph, with gusts as high as 17 mph.
Monday Night
Forecast Missing. Low around 53°F. Wind 3 to 5 mph, with gusts as high as 9 mph.
Tuesday
Forecast Missing. High near 69°F. Wind 7 to 12 mph, with gusts as high as 18 mph.
Tuesday Night
Forecast Missing. Low around 55°F. Wind 5 to 6 mph, with gusts as high as 10 mph.
Wednesday
Forecast Missing. High near 71°F. Wind 8 to 12 mph, with gusts as high as 17 mph.
Wednesday Night
Forecast Missing. Low around 57°F. Wind 2 to 5 mph, with gusts as high as 9 mph.
CA Radar
Current Radar • CA
Day 1 Outlook • April 24, 2026

Observation History — San Ysidro, 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)
07:55 PM PDT W 5.8 10.00 Clear -- 61.0 52.0 72% NA NA 29.94 1013.6
06:55 PM PDT W 8.1 10.00 Clear -- 64.0 52.0 65% NA NA 29.92 1013.2
05:55 PM PDT W 8.1 10.00 Clear -- 66.0 50.0 56% NA NA 29.91 1012.9
04:55 PM PDT W 13.9 10.00 Clear -- 69.1 48.0 47% NA NA 29.94 1013.6
03:55 PM PDT W 10.3 10.00 Clear -- 70.0 45.0 41% NA NA 29.91 1012.9
02:55 PM PDT W 10.3 10.00 Clear -- 72.0 46.0 40% NA 70.7 29.94 1013.9
01:55 PM PDT 5.8 10.00 Clear -- 72.0 48.9 44% NA 70.9 29.95 1014.2
12:55 PM PDT 5.8 10.00 Partly Cloudy -- 70.0 50.0 49% NA NA 29.96 1014.6
11:55 AM PDT 6.9 10.00 NULL -- 68.0 48.9 50% NA NA 29.99 1015.6
10:55 AM PDT 4.7 10.00 Clear -- 68.0 46.0 45% NA NA 30.00 1015.9
09:55 AM PDT NW 4.7 10.00 Clear -- 64.9 46.9 52% NA NA 30.01 1016.3
08:55 AM PDT 0.0 10.00 Clear -- 62.1 48.0 60% NA NA 30.02 1016.6
07:55 AM PDT 3.4 10.00 Clear -- 57.9 48.0 70% NA NA 30.03 1016.9
06:55 AM PDT 0.0 10.00 Mostly Clear -- 52.0 46.9 83% NA NA 30.02 1016.6
06:14 AM PDT E 3.4 10.00 Mostly Cloudy -- 51.1 46.0 83% NA NA 30.02 1016.6
05:55 AM PDT E 3.4 10.00 Clear -- 50.0 46.0 86% NA NA 30.01 1016.3
04:55 AM PDT E 4.7 10.00 Clear -- 50.0 46.0 86% NA NA 30.00 1015.9
04:09 AM PDT E 5.8 10.00 Partly Cloudy -- 51.1 46.9 86% NA NA 30.01 1016.3
03:55 AM PDT 5.8 10.00 Mostly Cloudy -- 52.0 48.0 86% NA NA 30.01 1016.3
02:55 AM PDT 4.7 10.00 Mostly Clear -- 50.0 46.9 89% NA NA 30.01 1016.3
02:38 AM PDT 0.0 10.00 Partly Cloudy -- 51.1 48.0 89% NA NA 30.01 1016.3
01:55 AM PDT 4.7 10.00 Mostly Cloudy -- 51.1 48.0 89% NA NA 30.03 1016.9
12:55 AM PDT NE 4.7 10.00 Clear -- 53.1 48.9 86% NA NA 30.05 1017.6
12:31 AM PDT NE 4.7 10.00 Partly Cloudy -- 53.1 48.0 83% NA NA 30.06 1018.0

Regional Weather Observation

MIRAMAR NAS/SAN (KNKX)

Clear
61.0 F

IMPERIAL BEACH (KNRS)

Partly Cloudy
62.1 F

SAN DIEGO/MNTGMY (KMYF)

Clear
62.6 F

NORTH ISLAND NAS (KNZY)

Mostly Clear
63.0 F

SAN DIEGO (KSAN)

Clear
62.6 F

SAN DIEGO/BROWN (KSDM)

Clear
59.0 F
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