Monthly outlook for San Antonio Heights, CA: average high 90.2°, average low 71.4°. That is 0° above the climate normal for August. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 0 days and 0.1 inches. The warmest day looks like 24 August (100.1°), the coolest 14 August (60.5°).
90.2°/71.4°
Average high / low
+0°
Above normal
1 / 0
Wet days / normal
0.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
86.1°
90.4°
-2.4°
19 August – 28 August
97°
90.4°
+3.7°
29 August – 7 September
at normal
91.4°
—
August records over 66 years
109.2°15 August 2020All-time high
50°22 August 1968All-time low
Climate normals and records are computed from the nearest reference point — Rancho Cucamonga (6 mi).
Mon, 1091° / 65°0
91 °
San Antonio Heights, Monday, 10 August
Partly cloudy. High 91°, low 65°.
Pressure29.94 inHg
Wind10.4 mph SW
Humidity27%
Visibility6.2 mi
Dew point50°
Tue, 1187° / 69°0
87 °
San Antonio Heights, Tuesday, 11 August
Overcast. High 87°, low 69°.
Pressure30.00 inHg
Wind10.8 mph SW
Humidity27%
Visibility6.2 mi
Dew point48°
Wed, 1282° / 67°0
82 °
San Antonio Heights, Wednesday, 12 August
Clear. High 82°, low 67°.
Pressure29.94 inHg
Wind11.2 mph SW
Humidity33%
Visibility6.2 mi
Dew point49°
Thu, 1379° / 63°0
79 °
San Antonio Heights, Thursday, 13 August
Clear. High 79°, low 63°.
Pressure29.94 inHg
Wind10.8 mph SW
Humidity41%
Visibility—
Dew point48°
Fri, 1481° / 61°0
81 °
San Antonio Heights, Friday, 14 August
Overcast. High 81°, low 61°.
Pressure29.97 inHg
Wind11.3 mph SW
Humidity35%
Visibility—
Dew point45°
Sat, 1580° / 67°0
80 °
San Antonio Heights, Saturday, 15 August
Overcast. High 80°, low 67°.
Pressure30.03 inHg
Wind11 mph SW
Humidity33%
Visibility—
Dew point46°
Sun, 1682° / 66°0.06
82 °
San Antonio Heights, Sunday, 16 August
Light rain. High 82°, low 66°.
Pressure30.09 inHg
Wind11 mph SW
Humidity49%
Visibility—
Dew point55°
Mon, 1790° / 69°0
90 °
San Antonio Heights, Monday, 17 August
Mostly clear. High 90°, low 69°.
Pressure30.06 inHg
Wind11.3 mph SW
Humidity32%
Visibility—
Dew point50°
Tue, 1894° / 75°0
94 °
San Antonio Heights, Tuesday, 18 August
Overcast. High 94°, low 75°.
Pressure30.00 inHg
Wind11 mph SW
Humidity27%
Visibility—
Dew point50°
Wed, 1998° / 79°0
98 °
San Antonio Heights, Wednesday, 19 August
Clear. High 98°, low 79°.
Pressure29.94 inHg
Wind12.9 mph SW
Humidity22%
Visibility—
Dew point48°
Thu, 2095° / 80°0
95 °
San Antonio Heights, Thursday, 20 August
Overcast. High 95°, low 80°.
Pressure29.94 inHg
Wind9.1 mph SW
Humidity27%
Visibility—
Dew point51°
Fri, 2196° / 79°0
96 °
San Antonio Heights, Friday, 21 August
Clear. High 96°, low 79°.
Pressure29.88 inHg
Wind11.5 mph SW
Humidity24%
Visibility—
Dew point50°
Sat, 2295° / 79°0.02
95 °
San Antonio Heights, Saturday, 22 August
Light rain. High 95°, low 79°.
Pressure29.91 inHg
Wind9.6 mph S
Humidity27%
Visibility—
Dew point51°
Sun, 2398° / 80°0.01
98 °
San Antonio Heights, Sunday, 23 August
Light rain. High 98°, low 80°.
Pressure29.97 inHg
Wind10.2 mph SW
Humidity24%
Visibility—
Dew point51°
Mon, 24100° / 81°0
100 °
San Antonio Heights, Monday, 24 August
Clear. High 100°, low 81°.
Pressure29.94 inHg
Wind11.8 mph SW
Humidity21%
Visibility—
Dew point49°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2591° / 66°0
91 °
San Antonio Heights, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high91°
Average low66°
Average precipitation0 in
Chance of precipitation2%
Record high105° (1985)
Record low57° (1960)
Wed, 2691° / 66°0
91 °
San Antonio Heights, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high91°
Average low66°
Average precipitation0 in
Chance of precipitation3%
Record high103° (1981)
Record low55° (1990)
Thu, 2792° / 66°0
92 °
San Antonio Heights, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high92°
Average low66°
Average precipitation0 in
Chance of precipitation3%
Record high105° (1981)
Record low54° (1973)
Fri, 2893° / 67°0
93 °
San Antonio Heights, Friday, 28 August
Climate normal for this date — 60-year average.
Average high93°
Average low67°
Average precipitation0 in
Chance of precipitation0%
Record high104° (1981)
Record low55° (1973)
Sat, 2993° / 67°0
93 °
San Antonio Heights, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high93°
Average low67°
Average precipitation0 in
Chance of precipitation2%
Record high104° (1998)
Record low55° (2010)
Sun, 3092° / 68°0
92 °
San Antonio Heights, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high92°
Average low68°
Average precipitation0 in
Chance of precipitation0%
Record high106° (2017)
Record low56° (2010)
Mon, 3191° / 66°0
91 °
San Antonio Heights, Monday, 31 August
Climate normal for this date — 60-year average.
Average high91°
Average low66°
Average precipitation0 in
Chance of precipitation3%
Record high106° (2022)
Record low55° (1964)
Tue, 0191° / 66°0
91 °
San Antonio Heights, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high91°
Average low66°
Average precipitation0 in
Chance of precipitation5%
Record high106° (2017)
Record low55° (1964)
Wed, 0291° / 66°0.02
91 °
San Antonio Heights, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high91°
Average low66°
Average precipitation0.02 in
Chance of precipitation8%
Record high104° (1982)
Record low52° (1964)
Thu, 0391° / 66°0.01
91 °
San Antonio Heights, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high91°
Average low66°
Average precipitation0.01 in
Chance of precipitation8%
Record high107° (2022)
Record low55° (2000)
Fri, 0491° / 67°0
91 °
San Antonio Heights, Friday, 4 September
Climate normal for this date — 60-year average.
Average high91°
Average low67°
Average precipitation0 in
Chance of precipitation2%
Record high106° (2022)
Record low55° (1985)
Sat, 0591° / 67°0.01
91 °
San Antonio Heights, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high91°
Average low67°
Average precipitation0.01 in
Chance of precipitation3%
Record high112° (2020)
Record low56° (1970)
Sun, 0691° / 66°0.02
91 °
San Antonio Heights, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high91°
Average low66°
Average precipitation0.02 in
Chance of precipitation3%
Record high111° (2020)
Record low56° (2000)
Mon, 0791° / 66°0
91 °
San Antonio Heights, Monday, 7 September
Climate normal for this date — 60-year average.
Average high91°
Average low66°
Average precipitation0 in
Chance of precipitation3%
Record high106° (2022)
Record low53° (1964)
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 San Antonio Heights, 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 San Antonio Heights, 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.