Monthly outlook for Great River, NY: average high 59.4°, average low 49.2°. That is 0.1° above the climate normal for October. Precipitation is expected on 6 days (about 0.9 inches), against a normal of 5 days and 2.1 inches. The warmest day looks like 25 October (66.3°), the coolest 18 October (37.1°).
59.4°/49.2°
Average high / low
+0.1°
Above normal
6 / 5
Wet days / normal
0.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
17 October – 26 October
59.7°
60.1°
-0.2°
27 October – 5 November
58.8°
57.5°
+0.7°
6 November – 15 November
at normal
53.6°
—
October records over 66 years
82.9°8 October 2007All-time high
33.6°27 October 1976All-time low
Climate normals and records are computed from the nearest reference point — Islip (2 mi).
Sun, 1856° / 37°0
56 °
Great River, Sunday, 18 October
Clear. High 56°, low 37°.
Pressure30.56 inHg
Wind8 mph N
Humidity47%
Visibility6.2 mi
Dew point32°
Mon, 1960° / 44°0
60 °
Great River, Monday, 19 October
Overcast. High 60°, low 44°.
Pressure30.42 inHg
Wind9.1 mph N
Humidity50%
Visibility6.2 mi
Dew point38°
Tue, 2063° / 52°0
63 °
Great River, Tuesday, 20 October
Overcast. High 63°, low 52°.
Pressure30.18 inHg
Wind12.7 mph N
Humidity59%
Visibility6.2 mi
Dew point45°
Wed, 2157° / 48°0
57 °
Great River, Wednesday, 21 October
Clear. High 57°, low 48°.
Pressure30.27 inHg
Wind13.4 mph N
Humidity65%
Visibility—
Dew point41°
Thu, 2258° / 47°0
58 °
Great River, Thursday, 22 October
Clear. High 58°, low 47°.
Pressure30.09 inHg
Wind13.5 mph N
Humidity68%
Visibility—
Dew point41°
Fri, 2362° / 51°0
62 °
Great River, Friday, 23 October
Clear. High 62°, low 51°.
Pressure30.18 inHg
Wind16.7 mph NE
Humidity44%
Visibility—
Dew point35°
Sat, 2459° / 48°0
59 °
Great River, Saturday, 24 October
Clear. High 59°, low 48°.
Pressure30.33 inHg
Wind14.1 mph NE
Humidity56%
Visibility—
Dew point37°
Sun, 2566° / 50°0
66 °
Great River, Sunday, 25 October
Clear. High 66°, low 50°.
Pressure30.09 inHg
Wind12 mph N
Humidity40%
Visibility—
Dew point34°
Mon, 2658° / 47°0
58 °
Great River, Monday, 26 October
Clear. High 58°, low 47°.
Pressure30.18 inHg
Wind17.7 mph NW
Humidity39%
Visibility—
Dew point27°
Tue, 2759° / 48°0
59 °
Great River, Tuesday, 27 October
Overcast. High 59°, low 48°.
Pressure30.30 inHg
Wind8.8 mph N
Humidity34%
Visibility—
Dew point26°
Wed, 2858° / 53°0.18
58 °
Great River, Wednesday, 28 October
Light rain. High 58°, low 53°.
Pressure30.06 inHg
Wind10.4 mph SW
Humidity90%
Visibility—
Dew point51°
Thu, 2960° / 54°0.04
60 °
Great River, Thursday, 29 October
Light rain. High 60°, low 54°.
Pressure30.00 inHg
Wind11.1 mph NE
Humidity77%
Visibility—
Dew point50°
Fri, 3057° / 53°0.05
57 °
Great River, Friday, 30 October
Light rain. High 57°, low 53°.
Pressure30.06 inHg
Wind7.4 mph NE
Humidity76%
Visibility—
Dew point49°
Sat, 3160° / 57°0.2
60 °
Great River, Saturday, 31 October
Light rain. High 60°, low 57°.
Pressure29.71 inHg
Wind14.4 mph S
Humidity92%
Visibility—
Dew point57°
Sun, 0158° / 57°0.11
58 °
Great River, Sunday, 1 November
Light rain. High 58°, low 57°.
Pressure29.50 inHg
Wind15.7 mph N
Humidity93%
Visibility—
Dew point56°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 0258° / 49°0.07
58 °
Great River, Monday, 2 November
Climate normal for this date — 60-year average.
Average high58°
Average low49°
Average precipitation0.07 in
Chance of precipitation30%
Record high69° (1971)
Record low33° (1965)
Tue, 0358° / 48°0.11
58 °
Great River, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high58°
Average low48°
Average precipitation0.11 in
Chance of precipitation27%
Record high69° (2003)
Record low37° (1996)
Wed, 0457° / 47°0.06
57 °
Great River, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high57°
Average low47°
Average precipitation0.06 in
Chance of precipitation23%
Record high69° (1975)
Record low37° (2013)
Thu, 0556° / 48°0.14
56 °
Great River, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high56°
Average low48°
Average precipitation0.14 in
Chance of precipitation32%
Record high68° (2022)
Record low38° (1965)
Fri, 0655° / 47°0.11
55 °
Great River, Friday, 6 November
Climate normal for this date — 60-year average.
Average high55°
Average low47°
Average precipitation0.11 in
Chance of precipitation35%
Record high69° (2024)
Record low37° (1962)
Sat, 0755° / 46°0.1
55 °
Great River, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high55°
Average low46°
Average precipitation0.1 in
Chance of precipitation28%
Record high74° (2022)
Record low35° (1962)
Sun, 0854° / 45°0.16
54 °
Great River, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high54°
Average low45°
Average precipitation0.16 in
Chance of precipitation28%
Record high69° (2020)
Record low33° (2019)
Mon, 0955° / 45°0.1
55 °
Great River, Monday, 9 November
Climate normal for this date — 60-year average.
Average high55°
Average low45°
Average precipitation0.1 in
Chance of precipitation25%
Record high67° (1975)
Record low29° (2019)
Tue, 1055° / 45°0.17
55 °
Great River, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high55°
Average low45°
Average precipitation0.17 in
Chance of precipitation40%
Record high66° (1999)
Record low29° (2017)
Wed, 1154° / 45°0.15
54 °
Great River, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high54°
Average low45°
Average precipitation0.15 in
Chance of precipitation38%
Record high68° (2024)
Record low27° (2017)
Thu, 1253° / 44°0.17
53 °
Great River, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high53°
Average low44°
Average precipitation0.17 in
Chance of precipitation43%
Record high69° (2022)
Record low31° (2019)
Fri, 1351° / 42°0.23
51 °
Great River, Friday, 13 November
Climate normal for this date — 60-year average.
Average high51°
Average low42°
Average precipitation0.23 in
Chance of precipitation40%
Record high66° (1964)
Record low26° (2019)
Sat, 1451° / 42°0.11
51 °
Great River, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high51°
Average low42°
Average precipitation0.11 in
Chance of precipitation23%
Record high64° (1989)
Record low28° (1986)
Sun, 1552° / 43°0.12
52 °
Great River, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high52°
Average low43°
Average precipitation0.12 in
Chance of precipitation43%
Record high70° (1993)
Record low26° (1967)
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 Great River, NY 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 Great River, NY 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.