Grand Terrace, CA Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Grand Terrace, CA.

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Current Conditions — Grand Terrace, CA

ONTARIO (KONT)

Clear

60.8 F
Humidity:55%
Wind Speed:W 8.1 mph
Barometer:29.94 in
Dewpoint:44.6 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 23 2026, 11:15 PM PDT
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5-Day Forecast — Grand Terrace, CA

Friday

High 80 °F
Forecast Missing
Friday
Night
Low 53 °F
Forecast Missing
Saturday

High 71 °F
Forecast Missing
Saturday
Night
Low 50 °F
Forecast Missing
Sunday

High 68 °F
Forecast Missing
Sunday
Night
Low 50 °F
Forecast Missing
Monday

High 75 °F
Forecast Missing
Monday
Night
Low 50 °F
Forecast Missing
Tuesday

High 78 °F
Forecast Missing

Detailed Forecast — Grand Terrace, CA

Friday
Forecast Missing. High near 80°F. Wind 1 to 16 mph, with gusts as high as 25 mph.
Friday Night
Forecast Missing. Low around 53°F. Wind 2 to 10 mph, with gusts as high as 18 mph.
Saturday
Forecast Missing. High near 71°F. Wind 7 to 16 mph, with gusts as high as 25 mph.
Saturday Night
Forecast Missing. Low around 50°F. Wind 7 to 16 mph, with gusts as high as 25 mph.
Sunday
Forecast Missing. High near 68°F. Wind 6 to 13 mph, with gusts as high as 25 mph.
Sunday Night
Forecast Missing. Low around 50°F. Wind 2 to 6 mph, with gusts as high as 16 mph.
Monday
Forecast Missing. High near 75°F. Wind 3 to 10 mph, with gusts as high as 21 mph.
Monday Night
Forecast Missing. Low around 50°F. Wind 2 to 5 mph, with gusts as high as 13 mph.
Tuesday
Forecast Missing. High near 78°F. Wind 3 to 12 mph, with gusts as high as 23 mph.
Tuesday Night
Forecast Missing. Low around 51°F. Wind 2 to 6 mph, with gusts as high as 16 mph.
Wednesday
Forecast Missing. High near 77°F. Wind 5 to 12 mph, with gusts as high as 23 mph.
Wednesday Night
Forecast Missing. Low around 53°F. Wind 2 to 5 mph, with gusts as high as 13 mph.
Thursday
Forecast Missing. High near 80°F. Wind 3 to 12 mph, with gusts as high as 22 mph.
CA Radar
Current Radar • CA
Day 1 Outlook • April 24, 2026

Observation History — Grand Terrace, 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)
11:15 PM PDT W 8.1 10.00 Clear -- 60.8 44.6 55% NA NA 29.94 1013.9
11:10 PM PDT W 6.9 10.00 Clear -- 59.0 44.6 59% NA NA 29.94 1013.9
11:05 PM PDT W 6.9 10.00 Clear -- 60.8 44.6 55% NA NA 29.94 1013.9
11:00 PM PDT W 6.9 10.00 Clear -- 60.8 44.6 55% NA NA 29.95 1014.2
10:50 PM PDT W 4.6 10.00 Clear -- 60.8 44.6 55% NA NA 29.95 1014.2
10:45 PM PDT 4.6 10.00 Clear -- 60.8 44.6 55% NA NA 29.95 1014.2
10:40 PM PDT W 8.1 10.00 Clear -- 62.6 44.6 52% NA NA 29.95 1014.2
10:30 PM PDT 4.6 10.00 Clear -- 62.6 44.6 52% NA NA 29.95 1014.2
10:25 PM PDT 6.9 10.00 Clear -- 62.6 44.6 52% NA NA 29.95 1014.2
10:20 PM PDT 6.9 10.00 Clear -- 62.6 42.8 48% NA NA 29.95 1014.2
10:15 PM PDT 6.9 10.00 Clear -- 62.6 44.6 52% NA NA 29.95 1014.2
10:10 PM PDT 8.1 10.00 Clear -- 62.6 44.6 52% NA NA 29.95 1014.2
10:05 PM PDT 9.2 10.00 Clear -- 62.6 44.6 52% NA NA 29.94 1013.9
10:00 PM PDT W 9.2 10.00 Clear -- 62.6 44.6 52% NA NA 29.94 1013.9
09:45 PM PDT 9.2 10.00 Clear -- 62.6 44.6 52% NA NA 29.94 1013.9
09:35 PM PDT 8.1 10.00 Clear -- 62.6 44.6 52% NA NA 29.94 1013.9
09:25 PM PDT W 9.2 10.00 Clear -- 64.4 44.6 49% NA NA 29.93 1013.5
09:20 PM PDT 9.2 10.00 Clear -- 64.4 44.6 49% NA NA 29.93 1013.5
09:15 PM PDT 9.2 10.00 Clear -- 64.4 44.6 49% NA NA 29.93 1013.5
09:10 PM PDT 9.2 10.00 Clear -- 64.4 44.6 49% NA NA 29.92 1013.2
09:05 PM PDT 8.1 10.00 Clear -- 64.4 44.6 49% NA NA 29.92 1013.2
09:00 PM PDT 10.4 10.00 Clear -- 64.4 44.6 49% NA NA 29.92 1013.2
08:50 PM PDT 9.2 G 19.6 10.00 NULL -- 64.4 44.6 49% NA NA 29.91 1012.9
08:45 PM PDT SW 11.5 10.00 Clear -- 66.2 44.6 46% NA NA 29.91 1012.9

Regional Weather Observation

ONTARIO (KONT)

Clear
60.8 F

UPLAND (KCCB)

NULL
59.0 F

LA VERNE/BRACKET (KPOC)

Clear
64.4 F

SAN BERNARDINO (KSBD)

Clear
61.9 F

(KGXA)


F

VICTORVILLE (KVCV)

Clear
55.4 F
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