Monthly outlook for West Thumb, WY: average high 45.6°, average low 29°. That is 3.6° above the climate normal for October. Precipitation is expected on 5 days (about 1.3 inches), against a normal of 6 days and 1.4 inches. The warmest day looks like 21 October (58°), the coolest 27 October (21.7°).
45.6°/29°
Average high / low
+3.6°
Above normal
5 / 6
Wet days / normal
1.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
20 October – 29 October
48.5°
41.1°
+4.1°
30 October – 8 November
40.6°
35.3°
+3°
9 November – 18 November
at normal
31.6°
—
October records over 66 years
70°3 October 2010All-time high
-8.3°29 October 2023All-time low
Climate normals and records are computed from the nearest reference point — Lake (13 mi).
Wed, 2158° / 28°0.02
58 °
West Thumb, Wednesday, 21 October
Light rain. High 58°, low 28°.
Pressure30.12 inHg
Wind7.4 mph S
Humidity54%
Visibility6.2 mi
Dew point35°
Thu, 2253° / 33°0.01
53 °
West Thumb, Thursday, 22 October
Light rain. High 53°, low 33°.
Pressure30.00 inHg
Wind7.7 mph S
Humidity58%
Visibility6.2 mi
Dew point37°
Fri, 2344° / 31°0.55
44 °
West Thumb, Friday, 23 October
Snow. High 44°, low 31°.
Pressure29.85 inHg
Wind10.4 mph SW
Humidity96%
Visibility6.1 mi
Dew point39°
Sat, 2445° / 29°0.01
45 °
West Thumb, Saturday, 24 October
Light snow. High 45°, low 29°.
Pressure30.24 inHg
Wind4.8 mph S
Humidity64%
Visibility6.2 mi
Dew point30°
Sun, 2548° / 31°0
48 °
West Thumb, Sunday, 25 October
Clear. High 48°, low 31°.
Pressure30.18 inHg
Wind4.9 mph NW
Humidity56%
Visibility—
Dew point28°
Mon, 2639° / 22°0
39 °
West Thumb, Monday, 26 October
Clear. High 39°, low 22°.
Pressure30.33 inHg
Wind7.3 mph N
Humidity31%
Visibility—
Dew point6°
Tue, 2746° / 22°0
46 °
West Thumb, Tuesday, 27 October
Clear. High 46°, low 22°.
Pressure30.30 inHg
Wind7.8 mph SW
Humidity25%
Visibility—
Dew point7°
Wed, 2848° / 26°0
48 °
West Thumb, Wednesday, 28 October
Clear. High 48°, low 26°.
Pressure30.15 inHg
Wind5.5 mph SW
Humidity29%
Visibility—
Dew point12°
Thu, 2950° / 28°0
50 °
West Thumb, Thursday, 29 October
Overcast. High 50°, low 28°.
Pressure30.06 inHg
Wind4 mph SW
Humidity29%
Visibility—
Dew point13°
Fri, 3046° / 32°0.01
46 °
West Thumb, Friday, 30 October
Light rain. High 46°, low 32°.
Pressure30.03 inHg
Wind10.2 mph SW
Humidity55%
Visibility—
Dew point29°
Sat, 3147° / 33°0.01
47 °
West Thumb, Saturday, 31 October
Light rain. High 47°, low 33°.
Pressure30.06 inHg
Wind6.5 mph SW
Humidity51%
Visibility—
Dew point27°
Sun, 0146° / 31°0.07
46 °
West Thumb, Sunday, 1 November
Snow. High 46°, low 31°.
Pressure29.94 inHg
Wind9.8 mph SW
Humidity59%
Visibility—
Dew point29°
Mon, 0238° / 34°0.24
38 °
West Thumb, Monday, 2 November
Snow. High 38°, low 34°.
Pressure29.94 inHg
Wind11.2 mph SW
Humidity96%
Visibility—
Dew point34°
Tue, 0333° / 31°0.22
33 °
West Thumb, Tuesday, 3 November
Snow. High 33°, low 31°.
Pressure30.12 inHg
Wind9.4 mph SW
Humidity92%
Visibility—
Dew point30°
Wed, 0434° / 23°0.11
34 °
West Thumb, Wednesday, 4 November
Light snow. High 34°, low 23°.
Pressure30.15 inHg
Wind9.4 mph SW
Humidity87%
Visibility—
Dew point30°
From day 17 onward the outlook is built from 60-year climate statistics
Thu, 0535° / 24°0.1
35 °
West Thumb, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high35°
Average low24°
Average precipitation0.1 in
Chance of precipitation48%
Record high50° (1987)
Record low3° (2003)
Fri, 0635° / 23°0.11
35 °
West Thumb, Friday, 6 November
Climate normal for this date — 60-year average.
Average high35°
Average low23°
Average precipitation0.11 in
Chance of precipitation47%
Record high52° (1999)
Record low5° (2003)
Sat, 0735° / 23°0.12
35 °
West Thumb, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high35°
Average low23°
Average precipitation0.12 in
Chance of precipitation53%
Record high53° (1999)
Record low6° (1990)
Sun, 0834° / 22°0.13
34 °
West Thumb, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high34°
Average low22°
Average precipitation0.13 in
Chance of precipitation50%
Record high49° (2016)
Record low10° (1977)
Mon, 0933° / 21°0.11
33 °
West Thumb, Monday, 9 November
Climate normal for this date — 60-year average.
Average high33°
Average low21°
Average precipitation0.11 in
Chance of precipitation50%
Record high50° (2016)
Record low5° (1966)
Tue, 1032° / 21°0.08
32 °
West Thumb, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high32°
Average low21°
Average precipitation0.08 in
Chance of precipitation43%
Record high51° (2016)
Record low-4° (1986)
Wed, 1132° / 20°0.09
32 °
West Thumb, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high32°
Average low20°
Average precipitation0.09 in
Chance of precipitation42%
Record high50° (2016)
Record low-3° (2014)
Thu, 1233° / 20°0.1
33 °
West Thumb, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high33°
Average low20°
Average precipitation0.1 in
Chance of precipitation38%
Record high52° (1999)
Record low-9° (2014)
Fri, 1332° / 21°0.11
32 °
West Thumb, Friday, 13 November
Climate normal for this date — 60-year average.
Average high32°
Average low21°
Average precipitation0.11 in
Chance of precipitation43%
Record high49° (1999)
Record low-1° (2014)
Sat, 1431° / 20°0.1
31 °
West Thumb, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high31°
Average low20°
Average precipitation0.1 in
Chance of precipitation43%
Record high52° (1999)
Record low3° (2000)
Sun, 1531° / 19°0.05
31 °
West Thumb, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high31°
Average low19°
Average precipitation0.05 in
Chance of precipitation25%
Record high54° (1999)
Record low1° (2014)
Mon, 1631° / 20°0.1
31 °
West Thumb, Monday, 16 November
Climate normal for this date — 60-year average.
Average high31°
Average low20°
Average precipitation0.1 in
Chance of precipitation45%
Record high47° (1999)
Record low-2° (2014)
Tue, 1730° / 19°0.1
30 °
West Thumb, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high30°
Average low19°
Average precipitation0.1 in
Chance of precipitation53%
Record high49° (1999)
Record low2° (1968)
Wed, 1829° / 19°0.11
29 °
West Thumb, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high29°
Average low19°
Average precipitation0.11 in
Chance of precipitation45%
Record high42° (2008)
Record low-4° (2022)
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 West Thumb, WY 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 West Thumb, WY 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.