Weather in Grand Terrace, CA
Grand Terrace, Sunday, 9 August, 03:20
Mostly clear. Feels like 77°. High 101°, low 74°.
Monthly outlook for Grand Terrace, CA: average high 92.4°, average low 71.9°. That is 0.4° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 0 days and 0.1 inches. The warmest day looks like 9 August (101.4°), the coolest 16 August (69.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 91.2° | 92° | -0.4° |
| 19 August – 28 August | 94.5° | 92° | +1.3° |
| 29 August – 7 September | at normal | 93.2° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Rubidoux (7 mi).
0
Grand Terrace, Monday, 10 August
Mostly clear. High 98°, low 73°.
0
Grand Terrace, Tuesday, 11 August
Overcast. High 95°, low 75°.
0Grand Terrace, Wednesday, 12 August
Mostly clear. High 92°, low 73°.
0
Grand Terrace, Thursday, 13 August
Partly cloudy. High 89°, low 70°.
0Grand Terrace, Friday, 14 August
Overcast. High 87°, low 70°.
0.03
Grand Terrace, Saturday, 15 August
Light rain. High 79°, low 70°.
0Grand Terrace, Sunday, 16 August
Overcast. High 88°, low 69°.
0Grand Terrace, Monday, 17 August
Overcast. High 91°, low 71°.
0Grand Terrace, Tuesday, 18 August
Partly cloudy. High 92°, low 71°.
0Grand Terrace, Wednesday, 19 August
Overcast. High 92°, low 72°.
0Grand Terrace, Thursday, 20 August
Partly cloudy. High 94°, low 71°.
0Grand Terrace, Friday, 21 August
Partly cloudy. High 94°, low 72°.
0
Grand Terrace, Saturday, 22 August
Clear. High 96°, low 73°.
0Grand Terrace, Sunday, 23 August
Clear. High 95°, low 73°.
0Grand Terrace, Monday, 24 August
Clear. High 95°, low 72°.
0Grand Terrace, Tuesday, 25 August
Climate normal for this date — 60-year average.
0Grand Terrace, Wednesday, 26 August
Climate normal for this date — 60-year average.
0Grand Terrace, Thursday, 27 August
Climate normal for this date — 60-year average.
0Grand Terrace, Friday, 28 August
Climate normal for this date — 60-year average.
0Grand Terrace, Saturday, 29 August
Climate normal for this date — 60-year average.
0Grand Terrace, Sunday, 30 August
Climate normal for this date — 60-year average.
0Grand Terrace, Monday, 31 August
Climate normal for this date — 60-year average.
0.01Grand Terrace, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.02Grand Terrace, Wednesday, 2 September
Climate normal for this date — 60-year average.
0Grand Terrace, Thursday, 3 September
Climate normal for this date — 60-year average.
0Grand Terrace, Friday, 4 September
Climate normal for this date — 60-year average.
0.01Grand Terrace, Saturday, 5 September
Climate normal for this date — 60-year average.
0.02Grand Terrace, Sunday, 6 September
Climate normal for this date — 60-year average.
0Grand Terrace, Monday, 7 September
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Grand Terrace, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Grand Terrace, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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