Monthly outlook for Letts, IA: average high 68.4°, average low 51.3°. That is 3.4° above the climate normal for October. Precipitation is expected on 3 days (about 1.2 inches), against a normal of 4 days and 1.6 inches. The warmest day looks like 12 October (84.7°), the coolest 18 October (36.1°).
68.4°/51.3°
Average high / low
+3.4°
Above normal
3 / 4
Wet days / normal
1.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 October – 18 October
70.6°
63.3°
+4°
19 October – 28 October
64.7°
59.1°
+3.1°
29 October – 7 November
at normal
54.7°
—
October records over 66 years
91.2°3 October 2006All-time high
19.6°30 October 1980All-time low
Sat, 1081° / 61°0
81 °
Letts, Saturday, 10 October
Overcast. High 81°, low 61°.
Pressure30.00 inHg
Wind9.7 mph S
Humidity55%
Visibility6.2 mi
Dew point58°
Sun, 1178° / 55°0
78 °
Letts, Sunday, 11 October
Clear. High 78°, low 55°.
Pressure29.91 inHg
Wind6.5 mph S
Humidity54%
Visibility6.2 mi
Dew point56°
Mon, 1285° / 66°0
85 °
Letts, Monday, 12 October
Partly cloudy. High 85°, low 66°.
Pressure29.77 inHg
Wind11.4 mph SW
Humidity58%
Visibility6.2 mi
Dew point65°
Tue, 1379° / 68°0.09
79 °
Letts, Tuesday, 13 October
Light rain. High 79°, low 68°.
Pressure29.83 inHg
Wind11.8 mph SW
Humidity67%
Visibility—
Dew point66°
Wed, 1470° / 63°0.52
70 °
Letts, Wednesday, 14 October
Rain. High 70°, low 63°.
Pressure29.83 inHg
Wind10.9 mph E
Humidity93%
Visibility—
Dew point66°
Thu, 1574° / 58°0.58
74 °
Letts, Thursday, 15 October
Rain. High 74°, low 58°.
Pressure29.68 inHg
Wind21.4 mph W
Humidity95%
Visibility—
Dew point65°
Fri, 1655° / 44°0
55 °
Letts, Friday, 16 October
Mostly clear. High 55°, low 44°.
Pressure30.06 inHg
Wind24 mph W
Humidity48%
Visibility—
Dew point32°
Sat, 1747° / 40°0
47 °
Letts, Saturday, 17 October
Overcast. High 47°, low 40°.
Pressure30.36 inHg
Wind16.1 mph NW
Humidity57%
Visibility—
Dew point32°
Sun, 1855° / 36°0
55 °
Letts, Sunday, 18 October
Mostly clear. High 55°, low 36°.
Pressure30.33 inHg
Wind9.3 mph S
Humidity50%
Visibility—
Dew point32°
Mon, 1961° / 42°0
61 °
Letts, Monday, 19 October
Overcast. High 61°, low 42°.
Pressure30.33 inHg
Wind7.5 mph S
Humidity43%
Visibility—
Dew point34°
Tue, 2064° / 44°0
64 °
Letts, Tuesday, 20 October
Clear. High 64°, low 44°.
Pressure30.36 inHg
Wind8.4 mph SE
Humidity48%
Visibility—
Dew point40°
Wed, 2167° / 45°0
67 °
Letts, Wednesday, 21 October
Clear. High 67°, low 45°.
Pressure30.27 inHg
Wind7 mph SE
Humidity43%
Visibility—
Dew point38°
Thu, 2266° / 48°0
66 °
Letts, Thursday, 22 October
Clear. High 66°, low 48°.
Pressure30.27 inHg
Wind5.1 mph NE
Humidity47%
Visibility—
Dew point41°
Fri, 2365° / 47°0
65 °
Letts, Friday, 23 October
Clear. High 65°, low 47°.
Pressure30.21 inHg
Wind5.8 mph NE
Humidity50%
Visibility—
Dew point42°
Sat, 2465° / 47°0
65 °
Letts, Saturday, 24 October
Clear. High 65°, low 47°.
Pressure30.12 inHg
Wind5 mph E
Humidity54%
Visibility—
Dew point44°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 2558° / 43°0.07
58 °
Letts, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high58°
Average low43°
Average precipitation0.07 in
Chance of precipitation27%
Record high76° (2011)
Record low29° (2013)
Mon, 2658° / 42°0.11
58 °
Letts, Monday, 26 October
Climate normal for this date — 60-year average.
Average high58°
Average low42°
Average precipitation0.11 in
Chance of precipitation23%
Record high81° (1963)
Record low24° (1962)
Tue, 2757° / 42°0.07
57 °
Letts, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high57°
Average low42°
Average precipitation0.07 in
Chance of precipitation17%
Record high75° (2014)
Record low25° (1997)
Wed, 2856° / 41°0.04
56 °
Letts, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.04 in
Chance of precipitation18%
Record high75° (2016)
Record low23° (1967)
Thu, 2957° / 42°0.06
57 °
Letts, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high57°
Average low42°
Average precipitation0.06 in
Chance of precipitation22%
Record high80° (2024)
Record low22° (1980)
Fri, 3058° / 42°0.09
58 °
Letts, Friday, 30 October
Climate normal for this date — 60-year average.
Average high58°
Average low42°
Average precipitation0.09 in
Chance of precipitation33%
Record high77° (2024)
Record low20° (1980)
Sat, 3156° / 42°0.14
56 °
Letts, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high56°
Average low42°
Average precipitation0.14 in
Chance of precipitation33%
Record high75° (1968)
Record low25° (2019)
Sun, 0156° / 41°0.17
56 °
Letts, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.17 in
Chance of precipitation32%
Record high76° (2000)
Record low23° (2023)
Mon, 0254° / 40°0.09
54 °
Letts, Monday, 2 November
Climate normal for this date — 60-year average.
Average high54°
Average low40°
Average precipitation0.09 in
Chance of precipitation30%
Record high72° (2022)
Record low19° (1991)
Tue, 0354° / 39°0.07
54 °
Letts, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high54°
Average low39°
Average precipitation0.07 in
Chance of precipitation25%
Record high73° (2022)
Record low14° (1991)
Wed, 0453° / 40°0.11
53 °
Letts, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high53°
Average low40°
Average precipitation0.11 in
Chance of precipitation23%
Record high71° (2022)
Record low12° (1991)
Thu, 0553° / 39°0.11
53 °
Letts, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high53°
Average low39°
Average precipitation0.11 in
Chance of precipitation23%
Record high72° (1978)
Record low20° (1991)
Fri, 0653° / 38°0.07
53 °
Letts, Friday, 6 November
Climate normal for this date — 60-year average.
Average high53°
Average low38°
Average precipitation0.07 in
Chance of precipitation25%
Record high72° (2020)
Record low20° (1991)
Sat, 0753° / 37°0.02
53 °
Letts, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high53°
Average low37°
Average precipitation0.02 in
Chance of precipitation13%
Record high71° (1966)
Record low9° (1991)
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 Letts, IA 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 Letts, IA 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.