Monthly outlook for Great River, NY: average high 58.7°, average low 46.8°. That is 0.3° below the climate normal for October. Precipitation is expected on 2 days (about 0.4 inches), against a normal of 5 days and 2.1 inches. The warmest day looks like 26 October (65.6°), the coolest 18 October (37.5°).
58.7°/46.8°
Average high / low
−0.3°
Below normal
2 / 5
Wet days / normal
0.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
17 October – 26 October
59.8°
60.1°
-0.2°
27 October – 5 November
56.8°
57.5°
-0.4°
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, 1855° / 38°0
55 °
Great River, Sunday, 18 October
Clear. High 55°, low 38°.
Pressure30.56 inHg
Wind5.5 mph NE
Humidity47%
Visibility6.2 mi
Dew point33°
Mon, 1959° / 44°0
59 °
Great River, Monday, 19 October
Clear. High 59°, low 44°.
Pressure30.39 inHg
Wind8.6 mph NE
Humidity50%
Visibility6.2 mi
Dew point38°
Tue, 2062° / 51°0
62 °
Great River, Tuesday, 20 October
Partly cloudy. High 62°, low 51°.
Pressure30.21 inHg
Wind13.4 mph N
Humidity60%
Visibility6.2 mi
Dew point46°
Wed, 2156° / 48°0
56 °
Great River, Wednesday, 21 October
Mostly clear. High 56°, low 48°.
Pressure30.27 inHg
Wind13.3 mph NE
Humidity67%
Visibility—
Dew point42°
Thu, 2260° / 46°0
60 °
Great River, Thursday, 22 October
Clear. High 60°, low 46°.
Pressure30.06 inHg
Wind12.1 mph N
Humidity62%
Visibility—
Dew point39°
Fri, 2361° / 51°0
61 °
Great River, Friday, 23 October
Clear. High 61°, low 51°.
Pressure30.18 inHg
Wind14.1 mph NE
Humidity54%
Visibility—
Dew point39°
Sat, 2458° / 50°0
58 °
Great River, Saturday, 24 October
Clear. High 58°, low 50°.
Pressure30.39 inHg
Wind14.8 mph NE
Humidity57%
Visibility—
Dew point38°
Sun, 2563° / 48°0
63 °
Great River, Sunday, 25 October
Partly cloudy. High 63°, low 48°.
Pressure30.24 inHg
Wind10 mph NE
Humidity40%
Visibility—
Dew point30°
Mon, 2666° / 53°0
66 °
Great River, Monday, 26 October
Partly cloudy. High 66°, low 53°.
Pressure30.09 inHg
Wind10.1 mph SW
Humidity43%
Visibility—
Dew point38°
Tue, 2763° / 46°0
63 °
Great River, Tuesday, 27 October
Overcast. High 63°, low 46°.
Pressure29.91 inHg
Wind22 mph NW
Humidity60%
Visibility—
Dew point49°
Wed, 2853° / 42°0
53 °
Great River, Wednesday, 28 October
Clear. High 53°, low 42°.
Pressure30.39 inHg
Wind17 mph NW
Humidity41%
Visibility—
Dew point24°
Thu, 2957° / 50°0.1
57 °
Great River, Thursday, 29 October
Light rain. High 57°, low 50°.
Pressure30.12 inHg
Wind17.4 mph S
Humidity49%
Visibility—
Dew point36°
Fri, 3054° / 46°0
54 °
Great River, Friday, 30 October
Light rain. High 54°, low 46°.
Pressure29.77 inHg
Wind19.8 mph NW
Humidity73%
Visibility—
Dew point45°
Sat, 3154° / 45°0
54 °
Great River, Saturday, 31 October
Mostly clear. High 54°, low 45°.
Pressure30.24 inHg
Wind11.3 mph N
Humidity55%
Visibility—
Dew point34°
Sun, 0160° / 50°0
60 °
Great River, Sunday, 1 November
Overcast. High 60°, low 50°.
Pressure30.33 inHg
Wind9.8 mph S
Humidity66%
Visibility—
Dew point46°
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.