Monthly outlook for Shell Island, FL: average high 76.5°, average low 57.4°. That is 0° below the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 3 days and 1.1 inches. The warmest day looks like 27 October (82°), the coolest 22 October (48.8°).
76.5°/57.4°
Average high / low
−0°
Below normal
1 / 3
Wet days / normal
0.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
20 October – 29 October
77°
77.3°
-0.2°
30 October – 8 November
75.7°
74.4°
+0.7°
9 November – 18 November
at normal
71°
—
October records over 66 years
92.8°4 October 1971All-time high
39.6°20 October 2022All-time low
Climate normals and records are computed from the nearest reference point — St. Marks (1 mi).
Wed, 2177° / 53°0
77 °
Shell Island, Wednesday, 21 October
Clear. High 77°, low 53°.
Pressure30.15 inHg
Wind5.1 mph NE
Humidity42%
Visibility6.2 mi
Dew point48°
Thu, 2280° / 49°0
80 °
Shell Island, Thursday, 22 October
Clear. High 80°, low 49°.
Pressure30.12 inHg
Wind2.2 mph N
Humidity34%
Visibility6.2 mi
Dew point46°
Fri, 2376° / 50°0
76 °
Shell Island, Friday, 23 October
Clear. High 76°, low 50°.
Pressure30.18 inHg
Wind6 mph NE
Humidity45%
Visibility6.2 mi
Dew point50°
Sat, 2474° / 55°0
74 °
Shell Island, Saturday, 24 October
Clear. High 74°, low 55°.
Pressure30.30 inHg
Wind9.3 mph NE
Humidity53%
Visibility6.2 mi
Dew point51°
Sun, 2577° / 57°0
77 °
Shell Island, Sunday, 25 October
Clear. High 77°, low 57°.
Pressure30.24 inHg
Wind14.4 mph NE
Humidity52%
Visibility—
Dew point54°
Mon, 2680° / 63°0.02
80 °
Shell Island, Monday, 26 October
Light rain. High 80°, low 63°.
Pressure30.15 inHg
Wind10.5 mph NE
Humidity54%
Visibility—
Dew point60°
Tue, 2782° / 65°0
82 °
Shell Island, Tuesday, 27 October
Clear. High 82°, low 65°.
Pressure30.09 inHg
Wind8.1 mph E
Humidity51%
Visibility—
Dew point60°
Wed, 2877° / 66°0
77 °
Shell Island, Wednesday, 28 October
Partly cloudy. High 77°, low 66°.
Pressure30.12 inHg
Wind10.3 mph N
Humidity45%
Visibility—
Dew point52°
Thu, 2975° / 59°0
75 °
Shell Island, Thursday, 29 October
Overcast. High 75°, low 59°.
Pressure30.15 inHg
Wind8.7 mph E
Humidity50%
Visibility—
Dew point53°
Fri, 3077° / 60°0
77 °
Shell Island, Friday, 30 October
Partly cloudy. High 77°, low 60°.
Pressure30.12 inHg
Wind5 mph E
Humidity50%
Visibility—
Dew point54°
Sat, 3174° / 56°0
74 °
Shell Island, Saturday, 31 October
Overcast. High 74°, low 56°.
Pressure30.18 inHg
Wind8.9 mph E
Humidity41%
Visibility—
Dew point46°
Sun, 0174° / 61°0.07
74 °
Shell Island, Sunday, 1 November
Light rain. High 74°, low 61°.
Pressure30.12 inHg
Wind7.2 mph E
Humidity60%
Visibility—
Dew point58°
Mon, 0273° / 55°0
73 °
Shell Island, Monday, 2 November
Partly cloudy. High 73°, low 55°.
Pressure30.18 inHg
Wind9 mph NE
Humidity47%
Visibility—
Dew point49°
Tue, 0378° / 58°0
78 °
Shell Island, Tuesday, 3 November
Overcast. High 78°, low 58°.
Pressure30.18 inHg
Wind9.4 mph NE
Humidity52%
Visibility—
Dew point56°
Wed, 0478° / 61°0
78 °
Shell Island, Wednesday, 4 November
Mostly clear. High 78°, low 61°.
Pressure30.12 inHg
Wind7 mph NE
Humidity57%
Visibility—
Dew point59°
From day 17 onward the outlook is built from 60-year climate statistics
Thu, 0573° / 57°0.04
73 °
Shell Island, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.04 in
Chance of precipitation22%
Record high86° (2024)
Record low39° (1991)
Fri, 0673° / 56°0.07
73 °
Shell Island, Friday, 6 November
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.07 in
Chance of precipitation17%
Record high85° (2022)
Record low40° (1976)
Sat, 0773° / 56°0.09
73 °
Shell Island, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.09 in
Chance of precipitation18%
Record high87° (2024)
Record low39° (1967)
Sun, 0873° / 56°0.04
73 °
Shell Island, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.04 in
Chance of precipitation15%
Record high85° (2022)
Record low40° (1967)
Mon, 0973° / 56°0.12
73 °
Shell Island, Monday, 9 November
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.12 in
Chance of precipitation28%
Record high84° (2020)
Record low38° (1976)
Tue, 1073° / 56°0.11
73 °
Shell Island, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.11 in
Chance of precipitation17%
Record high84° (2020)
Record low42° (2019)
Wed, 1173° / 55°0.06
73 °
Shell Island, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high73°
Average low55°
Average precipitation0.06 in
Chance of precipitation17%
Record high84° (2023)
Record low32° (2025)
Thu, 1272° / 55°0.07
72 °
Shell Island, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high72°
Average low55°
Average precipitation0.07 in
Chance of precipitation13%
Record high82° (2020)
Record low30° (2025)
Fri, 1370° / 53°0.08
70 °
Shell Island, Friday, 13 November
Climate normal for this date — 60-year average.
Average high70°
Average low53°
Average precipitation0.08 in
Chance of precipitation12%
Record high82° (2024)
Record low36° (1968)
Sat, 1470° / 52°0.09
70 °
Shell Island, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high70°
Average low52°
Average precipitation0.09 in
Chance of precipitation20%
Record high80° (2005)
Record low39° (1968)
Sun, 1570° / 53°0.13
70 °
Shell Island, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high70°
Average low53°
Average precipitation0.13 in
Chance of precipitation23%
Record high80° (1985)
Record low33° (1969)
Mon, 1670° / 53°0.06
70 °
Shell Island, Monday, 16 November
Climate normal for this date — 60-year average.
Average high70°
Average low53°
Average precipitation0.06 in
Chance of precipitation22%
Record high80° (2025)
Record low36° (1969)
Tue, 1770° / 53°0.09
70 °
Shell Island, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high70°
Average low53°
Average precipitation0.09 in
Chance of precipitation18%
Record high80° (1964)
Record low36° (1970)
Wed, 1871° / 53°0.03
71 °
Shell Island, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high71°
Average low53°
Average precipitation0.03 in
Chance of precipitation12%
Record high82° (1985)
Record low36° (2014)
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 Shell Island, FL 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 Shell Island, FL 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.