Monthly outlook for Shell Island, FL: average high 78.9°, average low 61°. That is 0.6° above the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 3 days and 1.0 inches. The warmest day looks like 15 October (88.6°), the coolest 20 October (48.2°).
78.9°/61°
Average high / low
+0.6°
Above normal
1 / 3
Wet days / normal
0.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
15 October – 24 October
78°
78.6°
-0.3°
25 October – 3 November
80.3°
76.1°
+2.3°
4 November – 13 November
at normal
72.6°
—
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).
Fri, 1688° / 65°0.05
88 °
Shell Island, Friday, 16 October
Light rain. High 88°, low 65°.
Pressure30.06 inHg
Wind2.2 mph S
Humidity61%
Visibility6.2 mi
Dew point70°
Sat, 1773° / 59°0
73 °
Shell Island, Saturday, 17 October
Clear. High 73°, low 59°.
Pressure30.12 inHg
Wind12.6 mph N
Humidity44%
Visibility6.2 mi
Dew point43°
Sun, 1867° / 54°0
67 °
Shell Island, Sunday, 18 October
Clear. High 67°, low 54°.
Pressure30.30 inHg
Wind11.6 mph NE
Humidity37%
Visibility6.2 mi
Dew point37°
Mon, 1972° / 53°0
72 °
Shell Island, Monday, 19 October
Clear. High 72°, low 53°.
Pressure30.21 inHg
Wind9.6 mph NE
Humidity43%
Visibility—
Dew point45°
Tue, 2074° / 48°0
74 °
Shell Island, Tuesday, 20 October
Clear. High 74°, low 48°.
Pressure30.15 inHg
Wind8.6 mph NE
Humidity40%
Visibility—
Dew point43°
Wed, 2178° / 61°0
78 °
Shell Island, Wednesday, 21 October
Clear. High 78°, low 61°.
Pressure30.12 inHg
Wind9.1 mph NE
Humidity31%
Visibility—
Dew point43°
Thu, 2278° / 59°0
78 °
Shell Island, Thursday, 22 October
Clear. High 78°, low 59°.
Pressure30.15 inHg
Wind9.9 mph NE
Humidity41%
Visibility—
Dew point50°
Fri, 2380° / 63°0
80 °
Shell Island, Friday, 23 October
Clear. High 80°, low 63°.
Pressure30.09 inHg
Wind10.7 mph NE
Humidity51%
Visibility—
Dew point58°
Sat, 2481° / 64°0
81 °
Shell Island, Saturday, 24 October
Clear. High 81°, low 64°.
Pressure30.12 inHg
Wind10.6 mph NE
Humidity45%
Visibility—
Dew point56°
Sun, 2579° / 63°0
79 °
Shell Island, Sunday, 25 October
Partly cloudy. High 79°, low 63°.
Pressure30.18 inHg
Wind10.4 mph NE
Humidity60%
Visibility—
Dew point58°
Mon, 2681° / 67°0.02
81 °
Shell Island, Monday, 26 October
Light rain. High 81°, low 67°.
Pressure30.12 inHg
Wind6.5 mph NE
Humidity49%
Visibility—
Dew point58°
Tue, 2782° / 64°0
82 °
Shell Island, Tuesday, 27 October
Clear. High 82°, low 64°.
Pressure30.09 inHg
Wind5.8 mph NE
Humidity49%
Visibility—
Dew point58°
Wed, 2881° / 64°0
81 °
Shell Island, Wednesday, 28 October
Overcast. High 81°, low 64°.
Pressure30.03 inHg
Wind7.7 mph N
Humidity47%
Visibility—
Dew point57°
Thu, 2981° / 62°0
81 °
Shell Island, Thursday, 29 October
Mostly clear. High 81°, low 62°.
Pressure30.03 inHg
Wind7.2 mph N
Humidity48%
Visibility—
Dew point57°
Fri, 3078° / 63°0
78 °
Shell Island, Friday, 30 October
Overcast. High 78°, low 63°.
Pressure30.06 inHg
Wind7.7 mph N
Humidity42%
Visibility—
Dew point51°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 3176° / 60°0.06
76 °
Shell Island, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.06 in
Chance of precipitation15%
Record high87° (2016)
Record low43° (2025)
Sun, 0176° / 59°0.07
76 °
Shell Island, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high76°
Average low59°
Average precipitation0.07 in
Chance of precipitation15%
Record high87° (1961)
Record low37° (1993)
Mon, 0275° / 58°0.04
75 °
Shell Island, Monday, 2 November
Climate normal for this date — 60-year average.
Average high75°
Average low58°
Average precipitation0.04 in
Chance of precipitation15%
Record high85° (2024)
Record low40° (1993)
Tue, 0374° / 58°0.06
74 °
Shell Island, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high74°
Average low58°
Average precipitation0.06 in
Chance of precipitation22%
Record high85° (2024)
Record low37° (1966)
Wed, 0474° / 57°0.14
74 °
Shell Island, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high74°
Average low57°
Average precipitation0.14 in
Chance of precipitation22%
Record high87° (2016)
Record low36° (1966)
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)
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.