Monthly outlook for Arnold, MD: average high 68.4°, average low 53.4°. That is 1.4° above the climate normal for October. Precipitation is expected on 3 days (about 0.7 inches), against a normal of 4 days and 1.9 inches. The warmest day looks like 13 October (81.2°), the coolest 22 October (42°).
68.4°/53.4°
Average high / low
+1.4°
Above normal
3 / 4
Wet days / normal
0.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
7 October – 16 October
70.9°
67.2°
+2.1°
17 October – 26 October
64.1°
63.2°
+0.5°
27 October – 5 November
at normal
60.5°
—
October records over 66 years
94.1°2 October 2019All-time high
33.4°28 October 1976All-time low
Climate normals and records are computed from the nearest reference point — Naval Academy (4 mi).
Thu, 0877° / 53°0
77 °
Arnold, Thursday, 8 October
Clear. High 77°, low 53°.
Pressure29.94 inHg
Wind8.3 mph NW
Humidity50%
Visibility6.2 mi
Dew point53°
Fri, 0973° / 51°0
73 °
Arnold, Friday, 9 October
Clear. High 73°, low 51°.
Pressure30.24 inHg
Wind6 mph W
Humidity43%
Visibility6.2 mi
Dew point48°
Sat, 1069° / 54°0
69 °
Arnold, Saturday, 10 October
Overcast. High 69°, low 54°.
Pressure30.47 inHg
Wind3.5 mph E
Humidity63%
Visibility6.2 mi
Dew point53°
Sun, 1168° / 60°0.2
68 °
Arnold, Sunday, 11 October
Rain. High 68°, low 60°.
Pressure30.27 inHg
Wind7.8 mph SE
Humidity87%
Visibility6.2 mi
Dew point62°
Mon, 1276° / 68°0.38
76 °
Arnold, Monday, 12 October
Rain. High 76°, low 68°.
Pressure29.68 inHg
Wind11.7 mph S
Humidity95%
Visibility—
Dew point69°
Tue, 1381° / 65°0
81 °
Arnold, Tuesday, 13 October
Light rain. High 81°, low 65°.
Pressure29.85 inHg
Wind13.2 mph SW
Humidity60%
Visibility—
Dew point58°
Wed, 1464° / 52°0.06
64 °
Arnold, Wednesday, 14 October
Light rain. High 64°, low 52°.
Pressure29.94 inHg
Wind20.9 mph NW
Humidity53%
Visibility—
Dew point37°
Thu, 1563° / 47°0
63 °
Arnold, Thursday, 15 October
Clear. High 63°, low 47°.
Pressure30.09 inHg
Wind16.6 mph N
Humidity51%
Visibility—
Dew point36°
Fri, 1667° / 54°0
67 °
Arnold, Friday, 16 October
Overcast. High 67°, low 54°.
Pressure30.03 inHg
Wind11.6 mph N
Humidity63%
Visibility—
Dew point47°
Sat, 1766° / 58°0
66 °
Arnold, Saturday, 17 October
Overcast. High 66°, low 58°.
Pressure29.97 inHg
Wind8.4 mph NE
Humidity80%
Visibility—
Dew point55°
Sun, 1875° / 61°0
75 °
Arnold, Sunday, 18 October
Partly cloudy. High 75°, low 61°.
Pressure29.94 inHg
Wind10.7 mph NW
Humidity63%
Visibility—
Dew point56°
Mon, 1965° / 54°0
65 °
Arnold, Monday, 19 October
Clear. High 65°, low 54°.
Pressure30.03 inHg
Wind16 mph NW
Humidity50%
Visibility—
Dew point44°
Tue, 2064° / 49°0
64 °
Arnold, Tuesday, 20 October
Overcast. High 64°, low 49°.
Pressure30.12 inHg
Wind9.7 mph NW
Humidity53%
Visibility—
Dew point40°
Wed, 2158° / 45°0.01
58 °
Arnold, Wednesday, 21 October
Light rain. High 58°, low 45°.
Pressure29.97 inHg
Wind16.7 mph NW
Humidity64%
Visibility—
Dew point43°
Thu, 2256° / 42°0
56 °
Arnold, Thursday, 22 October
Mostly clear. High 56°, low 42°.
Pressure30.09 inHg
Wind16.4 mph N
Humidity58%
Visibility—
Dew point35°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 2363° / 51°0.11
63 °
Arnold, Friday, 23 October
Climate normal for this date — 60-year average.
Average high63°
Average low51°
Average precipitation0.11 in
Chance of precipitation23%
Record high78° (2007)
Record low36° (1969)
Sat, 2462° / 51°0.1
62 °
Arnold, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high62°
Average low51°
Average precipitation0.1 in
Chance of precipitation30%
Record high76° (2001)
Record low34° (1969)
Sun, 2562° / 51°0.17
62 °
Arnold, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high62°
Average low51°
Average precipitation0.17 in
Chance of precipitation30%
Record high77° (2021)
Record low38° (2018)
Mon, 2662° / 50°0.18
62 °
Arnold, Monday, 26 October
Climate normal for this date — 60-year average.
Average high62°
Average low50°
Average precipitation0.18 in
Chance of precipitation30%
Record high76° (2023)
Record low36° (1962)
Tue, 2762° / 50°0.19
62 °
Arnold, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high62°
Average low50°
Average precipitation0.19 in
Chance of precipitation30%
Record high78° (2023)
Record low35° (1976)
Wed, 2862° / 50°0.13
62 °
Arnold, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high62°
Average low50°
Average precipitation0.13 in
Chance of precipitation27%
Record high82° (2023)
Record low33° (1976)
Thu, 2960° / 48°0.26
60 °
Arnold, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high60°
Average low48°
Average precipitation0.26 in
Chance of precipitation20%
Record high76° (1984)
Record low34° (1965)
Fri, 3060° / 47°0.11
60 °
Arnold, Friday, 30 October
Climate normal for this date — 60-year average.
Average high60°
Average low47°
Average precipitation0.11 in
Chance of precipitation28%
Record high80° (2023)
Record low36° (2011)
Sat, 3161° / 49°0.06
61 °
Arnold, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high61°
Average low49°
Average precipitation0.06 in
Chance of precipitation23%
Record high79° (2024)
Record low37° (1975)
Sun, 0162° / 50°0.11
62 °
Arnold, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high62°
Average low50°
Average precipitation0.11 in
Chance of precipitation25%
Record high78° (2024)
Record low40° (2023)
Mon, 0261° / 50°0.11
61 °
Arnold, Monday, 2 November
Climate normal for this date — 60-year average.
Average high61°
Average low50°
Average precipitation0.11 in
Chance of precipitation30%
Record high76° (1971)
Record low36° (2023)
Tue, 0361° / 48°0.08
61 °
Arnold, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high61°
Average low48°
Average precipitation0.08 in
Chance of precipitation23%
Record high75° (2017)
Record low36° (1996)
Wed, 0459° / 47°0.11
59 °
Arnold, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high59°
Average low47°
Average precipitation0.11 in
Chance of precipitation25%
Record high76° (1974)
Record low35° (2006)
Thu, 0559° / 47°0.13
59 °
Arnold, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high59°
Average low47°
Average precipitation0.13 in
Chance of precipitation25%
Record high74° (2024)
Record low31° (1991)
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 Arnold, MD 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 Arnold, MD 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.