Monthly outlook for Firth, ID: average high 63.6°, average low 42.5°. That is 1.9° above the climate normal for October. Precipitation is expected on 3 days (about 1.0 inches), against a normal of 3 days and 0.6 inches. The warmest day looks like 7 October (82.7°), the coolest 16 October (33.2°).
63.6°/42.5°
Average high / low
+1.9°
Above normal
3 / 3
Wet days / normal
1.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
7 October – 16 October
64.6°
61.1°
+1.9°
17 October – 26 October
62°
57.3°
+2.6°
27 October – 5 November
at normal
50.3°
—
October records over 66 years
85.8°2 October 2010All-time high
6.4°30 October 2019All-time low
Climate normals and records are computed from the nearest reference point — Idaho Falls (15 mi).
Thu, 0882° / 44°0
82 °
Firth, Thursday, 8 October
Clear. High 82°, low 44°.
Pressure30.03 inHg
Wind5.5 mph SW
Humidity22%
Visibility6.2 mi
Dew point28°
Fri, 0982° / 49°0
82 °
Firth, Friday, 9 October
Clear. High 82°, low 49°.
Pressure29.68 inHg
Wind8.5 mph SW
Humidity20%
Visibility6.2 mi
Dew point31°
Sat, 1069° / 56°0.02
69 °
Firth, Saturday, 10 October
Light rain. High 69°, low 56°.
Pressure29.56 inHg
Wind10.6 mph SW
Humidity37%
Visibility6.2 mi
Dew point35°
Sun, 1153° / 43°0.43
53 °
Firth, Sunday, 11 October
Rain. High 53°, low 43°.
Pressure29.83 inHg
Wind15.7 mph N
Humidity77%
Visibility—
Dew point38°
Mon, 1253° / 38°0.51
53 °
Firth, Monday, 12 October
Rain. High 53°, low 38°.
Pressure30.03 inHg
Wind16.9 mph N
Humidity73%
Visibility—
Dew point34°
Tue, 1368° / 52°0.04
68 °
Firth, Tuesday, 13 October
Light rain. High 68°, low 52°.
Pressure29.83 inHg
Wind14.3 mph SW
Humidity55%
Visibility—
Dew point45°
Wed, 1454° / 43°0.01
54 °
Firth, Wednesday, 14 October
Light rain. High 54°, low 43°.
Pressure29.83 inHg
Wind29.1 mph SW
Humidity31%
Visibility—
Dew point20°
Thu, 1548° / 34°0
48 °
Firth, Thursday, 15 October
Mostly clear. High 48°, low 34°.
Pressure30.33 inHg
Wind7.7 mph W
Humidity39%
Visibility—
Dew point19°
Fri, 1654° / 33°0
54 °
Firth, Friday, 16 October
Mostly clear. High 54°, low 33°.
Pressure30.45 inHg
Wind6.9 mph S
Humidity23%
Visibility—
Dew point11°
Sat, 1760° / 41°0
60 °
Firth, Saturday, 17 October
Overcast. High 60°, low 41°.
Pressure30.15 inHg
Wind5.6 mph N
Humidity21%
Visibility—
Dew point13°
Sun, 1864° / 41°0
64 °
Firth, Sunday, 18 October
Clear. High 64°, low 41°.
Pressure30.09 inHg
Wind5.4 mph NE
Humidity22%
Visibility—
Dew point17°
Mon, 1963° / 44°0
63 °
Firth, Monday, 19 October
Clear. High 63°, low 44°.
Pressure30.09 inHg
Wind3.9 mph NW
Humidity21%
Visibility—
Dew point17°
Tue, 2061° / 40°0
61 °
Firth, Tuesday, 20 October
Clear. High 61°, low 40°.
Pressure30.21 inHg
Wind9.4 mph N
Humidity27%
Visibility—
Dew point20°
Wed, 2162° / 39°0
62 °
Firth, Wednesday, 21 October
Clear. High 62°, low 39°.
Pressure30.27 inHg
Wind6.3 mph NE
Humidity26%
Visibility—
Dew point20°
Thu, 2261° / 40°0
61 °
Firth, Thursday, 22 October
Clear. High 61°, low 40°.
Pressure30.09 inHg
Wind4.6 mph E
Humidity19%
Visibility—
Dew point12°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 2355° / 35°0.05
55 °
Firth, Friday, 23 October
Climate normal for this date — 60-year average.
Average high55°
Average low35°
Average precipitation0.05 in
Chance of precipitation28%
Record high69° (1960)
Record low21° (2020)
Sat, 2455° / 35°0.05
55 °
Firth, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high55°
Average low35°
Average precipitation0.05 in
Chance of precipitation27%
Record high72° (1992)
Record low18° (1975)
Sun, 2555° / 33°0.04
55 °
Firth, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high55°
Average low33°
Average precipitation0.04 in
Chance of precipitation23%
Record high74° (2014)
Record low14° (1997)
Mon, 2654° / 34°0.06
54 °
Firth, Monday, 26 October
Climate normal for this date — 60-year average.
Average high54°
Average low34°
Average precipitation0.06 in
Chance of precipitation28%
Record high71° (1999)
Record low14° (2020)
Tue, 2754° / 32°0.02
54 °
Firth, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high54°
Average low32°
Average precipitation0.02 in
Chance of precipitation15%
Record high71° (1977)
Record low14° (1996)
Wed, 2853° / 33°0.06
53 °
Firth, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high53°
Average low33°
Average precipitation0.06 in
Chance of precipitation27%
Record high69° (1990)
Record low16° (2019)
Thu, 2951° / 32°0.05
51 °
Firth, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high51°
Average low32°
Average precipitation0.05 in
Chance of precipitation23%
Record high70° (1964)
Record low12° (2019)
Fri, 3050° / 31°0.06
50 °
Firth, Friday, 30 October
Climate normal for this date — 60-year average.
Average high50°
Average low31°
Average precipitation0.06 in
Chance of precipitation25%
Record high70° (1962)
Record low6° (2019)
Sat, 3150° / 31°0.03
50 °
Firth, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high50°
Average low31°
Average precipitation0.03 in
Chance of precipitation17%
Record high70° (2008)
Record low13° (2019)
Sun, 0149° / 31°0.02
49 °
Firth, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high49°
Average low31°
Average precipitation0.02 in
Chance of precipitation23%
Record high68° (1988)
Record low11° (1989)
Mon, 0249° / 30°0.04
49 °
Firth, Monday, 2 November
Climate normal for this date — 60-year average.
Average high49°
Average low30°
Average precipitation0.04 in
Chance of precipitation23%
Record high65° (1965)
Record low3° (1991)
Tue, 0349° / 29°0.02
49 °
Firth, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high49°
Average low29°
Average precipitation0.02 in
Chance of precipitation17%
Record high65° (1965)
Record low2° (1991)
Wed, 0449° / 30°0.04
49 °
Firth, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high49°
Average low30°
Average precipitation0.04 in
Chance of precipitation18%
Record high65° (2020)
Record low15° (1991)
Thu, 0549° / 31°0.04
49 °
Firth, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high49°
Average low31°
Average precipitation0.04 in
Chance of precipitation22%
Record high66° (2020)
Record low11° (1961)
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 Firth, ID 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 Firth, ID 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.