Monthly outlook for McHenry, CA: average high 83.6°, average low 58°. That is 3.9° above the climate normal for October. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 2 days and 0.5 inches. The warmest day looks like 18 October (93.4°), the coolest 11 October (52.3°).
83.6°/58°
Average high / low
+3.9°
Above normal
0 / 2
Wet days / normal
0.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
10 October – 19 October
83.2°
77.6°
+3.1°
20 October – 29 October
84.4°
73.6°
+6°
30 October – 8 November
at normal
69°
—
October records over 66 years
105.3°2 October 2024All-time high
36.1°31 October 2019All-time low
Climate normals and records are computed from the nearest reference point — Riverbank (4 mi).
Sun, 1176° / 52°0
76 °
McHenry, Sunday, 11 October
Clear. High 76°, low 52°.
Pressure29.50 inHg
Wind4 mph W
Humidity42%
Visibility6.2 mi
Dew point45°
Mon, 1271° / 55°0.01
71 °
McHenry, Monday, 12 October
Light rain. High 71°, low 55°.
Pressure29.85 inHg
Wind2.6 mph SW
Humidity45%
Visibility6.2 mi
Dew point46°
Tue, 1378° / 53°0
78 °
McHenry, Tuesday, 13 October
Clear. High 78°, low 53°.
Pressure30.00 inHg
Wind7.3 mph W
Humidity28%
Visibility6.2 mi
Dew point36°
Wed, 1480° / 54°0
80 °
McHenry, Wednesday, 14 October
Clear. High 80°, low 54°.
Pressure30.06 inHg
Wind0.2 mph SE
Humidity23%
Visibility6.2 mi
Dew point32°
Thu, 1584° / 56°0
84 °
McHenry, Thursday, 15 October
Clear. High 84°, low 56°.
Pressure30.12 inHg
Wind3.1 mph NW
Humidity28%
Visibility—
Dew point37°
Fri, 1689° / 58°0
89 °
McHenry, Friday, 16 October
Clear. High 89°, low 58°.
Pressure30.09 inHg
Wind6.7 mph NW
Humidity21%
Visibility—
Dew point32°
Sat, 1792° / 61°0
92 °
McHenry, Saturday, 17 October
Clear. High 92°, low 61°.
Pressure30.06 inHg
Wind4.2 mph NW
Humidity14%
Visibility—
Dew point25°
Sun, 1893° / 62°0
93 °
McHenry, Sunday, 18 October
Clear. High 93°, low 62°.
Pressure30.03 inHg
Wind5.3 mph NW
Humidity10%
Visibility—
Dew point18°
Mon, 1991° / 62°0
91 °
McHenry, Monday, 19 October
Clear. High 91°, low 62°.
Pressure30.09 inHg
Wind10 mph NW
Humidity12%
Visibility—
Dew point22°
Tue, 2083° / 59°0
83 °
McHenry, Tuesday, 20 October
Partly cloudy. High 83°, low 59°.
Pressure30.09 inHg
Wind12.1 mph NW
Humidity31%
Visibility—
Dew point40°
Wed, 2181° / 53°0
81 °
McHenry, Wednesday, 21 October
Clear. High 81°, low 53°.
Pressure30.03 inHg
Wind8 mph NW
Humidity33%
Visibility—
Dew point38°
Thu, 2287° / 56°0
87 °
McHenry, Thursday, 22 October
Clear. High 87°, low 56°.
Pressure30.09 inHg
Wind5.3 mph NW
Humidity24%
Visibility—
Dew point34°
Fri, 2389° / 60°0
89 °
McHenry, Friday, 23 October
Clear. High 89°, low 60°.
Pressure30.06 inHg
Wind7.9 mph NW
Humidity20%
Visibility—
Dew point32°
Sat, 2482° / 64°0
82 °
McHenry, Saturday, 24 October
Overcast. High 82°, low 64°.
Pressure29.91 inHg
Wind7.2 mph NW
Humidity21%
Visibility—
Dew point32°
Sun, 2583° / 65°0
83 °
McHenry, Sunday, 25 October
Overcast. High 83°, low 65°.
Pressure30.03 inHg
Wind11.4 mph S
Humidity45%
Visibility—
Dew point52°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2673° / 51°0.07
73 °
McHenry, Monday, 26 October
Climate normal for this date — 60-year average.
Average high73°
Average low51°
Average precipitation0.07 in
Chance of precipitation12%
Record high86° (2017)
Record low42° (1971)
Tue, 2772° / 51°0.02
72 °
McHenry, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high72°
Average low51°
Average precipitation0.02 in
Chance of precipitation10%
Record high86° (2017)
Record low43° (2023)
Wed, 2871° / 51°0.07
71 °
McHenry, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high71°
Average low51°
Average precipitation0.07 in
Chance of precipitation13%
Record high85° (2003)
Record low41° (2019)
Thu, 2971° / 51°0.05
71 °
McHenry, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high71°
Average low51°
Average precipitation0.05 in
Chance of precipitation17%
Record high85° (2003)
Record low40° (1971)
Fri, 3070° / 49°0.06
70 °
McHenry, Friday, 30 October
Climate normal for this date — 60-year average.
Average high70°
Average low49°
Average precipitation0.06 in
Chance of precipitation17%
Record high82° (2014)
Record low37° (1971)
Sat, 3170° / 49°0.02
70 °
McHenry, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high70°
Average low49°
Average precipitation0.02 in
Chance of precipitation10%
Record high82° (2015)
Record low36° (2019)
Sun, 0170° / 49°0.05
70 °
McHenry, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high70°
Average low49°
Average precipitation0.05 in
Chance of precipitation12%
Record high83° (2020)
Record low38° (2019)
Mon, 0270° / 49°0.05
70 °
McHenry, Monday, 2 November
Climate normal for this date — 60-year average.
Average high70°
Average low49°
Average precipitation0.05 in
Chance of precipitation13%
Record high83° (2020)
Record low38° (2019)
Tue, 0370° / 49°0.04
70 °
McHenry, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high70°
Average low49°
Average precipitation0.04 in
Chance of precipitation12%
Record high81° (2020)
Record low40° (2019)
Wed, 0470° / 49°0.03
70 °
McHenry, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high70°
Average low49°
Average precipitation0.03 in
Chance of precipitation10%
Record high81° (1976)
Record low38° (1973)
Thu, 0569° / 49°0.05
69 °
McHenry, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high69°
Average low49°
Average precipitation0.05 in
Chance of precipitation12%
Record high83° (2010)
Record low42° (2015)
Fri, 0668° / 49°0.05
68 °
McHenry, Friday, 6 November
Climate normal for this date — 60-year average.
Average high68°
Average low49°
Average precipitation0.05 in
Chance of precipitation17%
Record high81° (1976)
Record low38° (1996)
Sat, 0767° / 49°0.06
67 °
McHenry, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high67°
Average low49°
Average precipitation0.06 in
Chance of precipitation23%
Record high78° (1967)
Record low41° (2018)
Sun, 0866° / 48°0.07
66 °
McHenry, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high66°
Average low48°
Average precipitation0.07 in
Chance of precipitation18%
Record high77° (1995)
Record low42° (1982)
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 McHenry, 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 McHenry, 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.