Monthly outlook for Newcastle, CA: average high 97.6°, average low 67.5°. That is 3.3° 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 22 August (104.3°), the coolest 15 August (63.2°).
97.6°/67.5°
Average high / low
+3.3°
Above normal
0 / 0
Wet days / normal
0.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
96.3°
92.7°
+2°
18 August – 27 August
99.7°
90.4°
+5.2°
28 August – 6 September
at normal
91.4°
—
August records over 66 years
110.7°17 August 2020All-time high
51.6°16 August 1976All-time low
Climate normals and records are computed from the nearest reference point — Roseville (12 mi).
Sun, 09102° / 69°0
102 °
Newcastle, Sunday, 9 August
Clear. High 102°, low 69°.
Pressure29.77 inHg
Wind7.1 mph SW
Humidity14%
Visibility6.2 mi
Dew point40°
Mon, 10103° / 68°0
103 °
Newcastle, Monday, 10 August
Overcast. High 103°, low 68°.
Pressure29.83 inHg
Wind6.6 mph SW
Humidity13%
Visibility6.2 mi
Dew point37°
Tue, 11101° / 68°0
101 °
Newcastle, Tuesday, 11 August
Clear. High 101°, low 68°.
Pressure29.88 inHg
Wind6.8 mph SW
Humidity17%
Visibility6.2 mi
Dew point42°
Wed, 1299° / 70°0
99 °
Newcastle, Wednesday, 12 August
Partly cloudy. High 99°, low 70°.
Pressure29.83 inHg
Wind6.5 mph SW
Humidity17%
Visibility6.2 mi
Dew point41°
Thu, 1395° / 67°0
95 °
Newcastle, Thursday, 13 August
Overcast. High 95°, low 67°.
Pressure29.77 inHg
Wind8.2 mph SW
Humidity21%
Visibility—
Dew point44°
Fri, 1487° / 66°0
87 °
Newcastle, Friday, 14 August
Overcast. High 87°, low 66°.
Pressure29.88 inHg
Wind7.8 mph SW
Humidity26%
Visibility—
Dew point46°
Sat, 1593° / 63°0
93 °
Newcastle, Saturday, 15 August
Clear. High 93°, low 63°.
Pressure29.94 inHg
Wind8 mph SW
Humidity23%
Visibility—
Dew point45°
Sun, 1695° / 64°0
95 °
Newcastle, Sunday, 16 August
Overcast. High 95°, low 64°.
Pressure29.94 inHg
Wind6.8 mph SW
Humidity16%
Visibility—
Dew point38°
Mon, 1790° / 68°0
90 °
Newcastle, Monday, 17 August
Overcast. High 90°, low 68°.
Pressure30.00 inHg
Wind7 mph SW
Humidity17%
Visibility—
Dew point36°
Tue, 1898° / 67°0
98 °
Newcastle, Tuesday, 18 August
Clear. High 98°, low 67°.
Pressure29.94 inHg
Wind7 mph W
Humidity17%
Visibility—
Dew point42°
Wed, 1998° / 67°0
98 °
Newcastle, Wednesday, 19 August
Mostly clear. High 98°, low 67°.
Pressure29.88 inHg
Wind7 mph SW
Humidity13%
Visibility—
Dew point34°
Thu, 2097° / 64°0
97 °
Newcastle, Thursday, 20 August
Clear. High 97°, low 64°.
Pressure29.85 inHg
Wind6.8 mph SW
Humidity14%
Visibility—
Dew point36°
Fri, 21101° / 68°0
101 °
Newcastle, Friday, 21 August
Clear. High 101°, low 68°.
Pressure29.83 inHg
Wind6.9 mph SW
Humidity13%
Visibility—
Dew point38°
Sat, 22104° / 73°0
104 °
Newcastle, Saturday, 22 August
Overcast. High 104°, low 73°.
Pressure29.77 inHg
Wind7.5 mph W
Humidity11%
Visibility—
Dew point36°
Sun, 2399° / 71°0
99 °
Newcastle, Sunday, 23 August
Light rain. High 99°, low 71°.
Pressure29.80 inHg
Wind8.3 mph SW
Humidity17%
Visibility—
Dew point44°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2491° / 61°0
91 °
Newcastle, Monday, 24 August
Climate normal for this date — 60-year average.
Average high91°
Average low61°
Average precipitation0 in
Chance of precipitation2%
Record high105° (2010)
Record low54° (1963)
Tue, 2590° / 61°0
90 °
Newcastle, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high90°
Average low61°
Average precipitation0 in
Chance of precipitation0%
Record high107° (2010)
Record low53° (2024)
Wed, 2691° / 61°0
91 °
Newcastle, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high91°
Average low61°
Average precipitation0 in
Chance of precipitation0%
Record high104° (2017)
Record low55° (1966)
Thu, 2792° / 62°0
92 °
Newcastle, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high92°
Average low62°
Average precipitation0 in
Chance of precipitation0%
Record high107° (2017)
Record low55° (1991)
Fri, 2892° / 62°0
92 °
Newcastle, Friday, 28 August
Climate normal for this date — 60-year average.
Average high92°
Average low62°
Average precipitation0 in
Chance of precipitation0%
Record high107° (2017)
Record low55° (1960)
Sat, 2992° / 62°0
92 °
Newcastle, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high92°
Average low62°
Average precipitation0 in
Chance of precipitation0%
Record high106° (2021)
Record low54° (1980)
Sun, 3091° / 62°0
91 °
Newcastle, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high91°
Average low62°
Average precipitation0 in
Chance of precipitation2%
Record high103° (1976)
Record low54° (1966)
Mon, 3191° / 61°0
91 °
Newcastle, Monday, 31 August
Climate normal for this date — 60-year average.
Average high91°
Average low61°
Average precipitation0 in
Chance of precipitation2%
Record high103° (1976)
Record low55° (1966)
Tue, 0192° / 62°0.01
92 °
Newcastle, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high92°
Average low62°
Average precipitation0.01 in
Chance of precipitation3%
Record high109° (2017)
Record low53° (1999)
Wed, 0291° / 62°0.03
91 °
Newcastle, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high91°
Average low62°
Average precipitation0.03 in
Chance of precipitation7%
Record high107° (2017)
Record low51° (1964)
Thu, 0391° / 62°0
91 °
Newcastle, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high91°
Average low62°
Average precipitation0 in
Chance of precipitation2%
Record high106° (2017)
Record low52° (2000)
Fri, 0491° / 62°0
91 °
Newcastle, Friday, 4 September
Climate normal for this date — 60-year average.
Average high91°
Average low62°
Average precipitation0 in
Chance of precipitation0%
Record high108° (2022)
Record low52° (1965)
Sat, 0591° / 62°0.01
91 °
Newcastle, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high91°
Average low62°
Average precipitation0.01 in
Chance of precipitation3%
Record high116° (2022)
Record low52° (2000)
Sun, 0691° / 62°0
91 °
Newcastle, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high91°
Average low62°
Average precipitation0 in
Chance of precipitation2%
Record high118° (2022)
Record low53° (1973)
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 Newcastle, 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 Newcastle, 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.