Monthly outlook for Iselin, PA: average high 59.2°, average low 42.2°. That is 0.2° below the climate normal for October. Precipitation is expected on 5 days (about 2.8 inches), against a normal of 6 days and 1.7 inches. The warmest day looks like 13 October (77.1°), the coolest 19 October (27.2°).
59.2°/42.2°
Average high / low
−0.2°
Below normal
5 / 6
Wet days / normal
2.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
10 October – 19 October
61°
60.7°
+0.1°
20 October – 29 October
56.3°
56.7°
-0.2°
30 October – 8 November
at normal
53.8°
—
October records over 66 years
85.1°1 October 2019All-time high
23.7°20 October 1972All-time low
Climate normals and records are computed from the nearest reference point — Indiana (13 mi).
Sun, 1166° / 50°0.94
66 °
Iselin, Sunday, 11 October
Heavy rain. High 66°, low 50°.
Pressure30.06 inHg
Wind10.3 mph E
Humidity96%
Visibility1.8 mi
Dew point58°
Mon, 1269° / 51°0.01
69 °
Iselin, Monday, 12 October
Light rain. High 69°, low 51°.
Pressure29.94 inHg
Wind8.6 mph NW
Humidity81%
Visibility6.2 mi
Dew point59°
Tue, 1377° / 56°0
77 °
Iselin, Tuesday, 13 October
Clear. High 77°, low 56°.
Pressure29.85 inHg
Wind11.3 mph SW
Humidity67%
Visibility6.2 mi
Dew point61°
Wed, 1466° / 58°0.03
66 °
Iselin, Wednesday, 14 October
Light rain. High 66°, low 58°.
Pressure30.00 inHg
Wind8.6 mph NW
Humidity70%
Visibility6.2 mi
Dew point57°
Thu, 1561° / 48°0
61 °
Iselin, Thursday, 15 October
Mostly clear. High 61°, low 48°.
Pressure30.30 inHg
Wind8 mph N
Humidity47%
Visibility—
Dew point39°
Fri, 1668° / 52°1.54
68 °
Iselin, Friday, 16 October
Heavy rain. High 68°, low 52°.
Pressure29.68 inHg
Wind16.2 mph SW
Humidity89%
Visibility—
Dew point63°
Sat, 1745° / 39°0.05
45 °
Iselin, Saturday, 17 October
Light rain. High 45°, low 39°.
Pressure29.97 inHg
Wind13.4 mph W
Humidity56%
Visibility—
Dew point29°
Sun, 1843° / 29°0.02
43 °
Iselin, Sunday, 18 October
Snow. High 43°, low 29°.
Pressure30.33 inHg
Wind12 mph NW
Humidity53%
Visibility—
Dew point25°
Mon, 1948° / 27°0
48 °
Iselin, Monday, 19 October
Overcast. High 48°, low 27°.
Pressure30.53 inHg
Wind2.6 mph NW
Humidity44%
Visibility—
Dew point25°
Tue, 2058° / 31°0
58 °
Iselin, Tuesday, 20 October
Clear. High 58°, low 31°.
Pressure30.47 inHg
Wind5.1 mph SE
Humidity38%
Visibility—
Dew point29°
Wed, 2157° / 37°0
57 °
Iselin, Wednesday, 21 October
Overcast. High 57°, low 37°.
Pressure30.30 inHg
Wind8.9 mph SE
Humidity42%
Visibility—
Dew point32°
Thu, 2256° / 43°0.06
56 °
Iselin, Thursday, 22 October
Light rain. High 56°, low 43°.
Pressure30.12 inHg
Wind9.4 mph SW
Humidity90%
Visibility—
Dew point50°
Fri, 2361° / 41°0
61 °
Iselin, Friday, 23 October
Clear. High 61°, low 41°.
Pressure30.00 inHg
Wind13 mph W
Humidity51%
Visibility—
Dew point40°
Sat, 2454° / 35°0
54 °
Iselin, Saturday, 24 October
Clear. High 54°, low 35°.
Pressure30.12 inHg
Wind10.9 mph W
Humidity51%
Visibility—
Dew point34°
Sun, 2552° / 35°0.11
52 °
Iselin, Sunday, 25 October
Light rain. High 52°, low 35°.
Pressure30.03 inHg
Wind5 mph E
Humidity60%
Visibility—
Dew point37°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2656° / 42°0.09
56 °
Iselin, Monday, 26 October
Climate normal for this date — 60-year average.
Average high56°
Average low42°
Average precipitation0.09 in
Chance of precipitation32%
Record high77° (1963)
Record low28° (1962)
Tue, 2756° / 42°0.14
56 °
Iselin, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high56°
Average low42°
Average precipitation0.14 in
Chance of precipitation38%
Record high76° (1963)
Record low26° (1976)
Wed, 2856° / 41°0.11
56 °
Iselin, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.11 in
Chance of precipitation37%
Record high73° (2014)
Record low25° (1976)
Thu, 2954° / 40°0.19
54 °
Iselin, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high54°
Average low40°
Average precipitation0.19 in
Chance of precipitation38%
Record high72° (2024)
Record low24° (1965)
Fri, 3055° / 40°0.12
55 °
Iselin, Friday, 30 October
Climate normal for this date — 60-year average.
Average high55°
Average low40°
Average precipitation0.12 in
Chance of precipitation30%
Record high72° (2024)
Record low29° (2011)
Sat, 3156° / 41°0.1
56 °
Iselin, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.1 in
Chance of precipitation32%
Record high76° (2024)
Record low26° (1975)
Sun, 0156° / 42°0.11
56 °
Iselin, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high56°
Average low42°
Average precipitation0.11 in
Chance of precipitation42%
Record high72° (1974)
Record low30° (2023)
Mon, 0256° / 41°0.14
56 °
Iselin, Monday, 2 November
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.14 in
Chance of precipitation42%
Record high74° (1982)
Record low24° (1993)
Tue, 0355° / 40°0.09
55 °
Iselin, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high55°
Average low40°
Average precipitation0.09 in
Chance of precipitation37%
Record high73° (1961)
Record low27° (1966)
Wed, 0453° / 39°0.11
53 °
Iselin, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high53°
Average low39°
Average precipitation0.11 in
Chance of precipitation32%
Record high74° (2003)
Record low24° (1991)
Thu, 0553° / 39°0.11
53 °
Iselin, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high53°
Average low39°
Average precipitation0.11 in
Chance of precipitation45%
Record high76° (2024)
Record low19° (1991)
Fri, 0652° / 39°0.09
52 °
Iselin, Friday, 6 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.09 in
Chance of precipitation42%
Record high74° (2022)
Record low25° (1995)
Sat, 0751° / 38°0.13
51 °
Iselin, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high51°
Average low38°
Average precipitation0.13 in
Chance of precipitation42%
Record high70° (1975)
Record low25° (1967)
Sun, 0851° / 37°0.12
51 °
Iselin, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.12 in
Chance of precipitation32%
Record high72° (2020)
Record low24° (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 Iselin, PA 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 Iselin, PA 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.