Idaho Falls September 21 Weather Records

Daily averages and all-time records for weather in Idaho Falls, Idaho for the date of September 21.
September 21 All-Time Records
1948–2023
Highest temperature 86 °F 1966
Lowest temperature 22 °F 1983
Lowest daily high 43 °F 1968
Highest daily low 49 °F 2014
Most precipitation 1.0 inches 2006
September 21 Average Weather
1991–2020 1
Average high 72.4 °F
Average low 39.1 °F
Chance precipitation 20.4%
Idaho Falls September 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2022 79 44 0.71 n/a
2021 68 33 0.00 n/a
2020 79 38 0.00 n/a
2019 60 42 0.00 n/a
2018 76 33 0.00 n/a
2017 46 38 0.66 n/a
2016 74 45 0.24 n/a
2015 82 40 0.00 n/a
2014 80 49 0.08 n/a
2012 82 37 0.00 n/a
2011 76 36 0.00 n/a
2010 77 34 0.00 n/a
2009 64 31 0.00 n/a
2008 64 48 0.00 n/a
2007 74 37 0.00 n/a
2006 55 37 1.03 n/a
2005 58 42 1.01 n/a
2004 55 30 0.00 n/a
2003 73 32 0.00 n/a
2002 63 31 0.00 n/a
2001 82 38 0.00 n/a
2000 60 36 0.01 n/a
1999 78 34 0.00 n/a
1998 65 37 0.10 n/a
1993 64 36 0.00 0.0
1992 75 42 0.00 0.0
1991 64 35 0.00 0.0
1990 75 38 0.00 0.0
1989 73 38 0.00 0.0
1988 69 34 0.00 0.0
1987 84 35 0.00 0.0
1986 58 29 0.00 0.0
1985 63 45 0.05 0.0
1984 56 41 0.06 0.0
1983 66 22 0.00 0.0
1982 77 42 0.00 0.0
1981 68 44 0.00 0.0
1980 59 35 0.09 0.0
1979 82 35 0.00 0.0
1978 64 27 0.00 0.0
1977 59 36 0.03 0.0
1976 79 41 0.00 0.0
1975 70 32 0.00 0.0
1974 74 38 0.00 0.0
1973 62 39 0.00 0.0
1972 72 32 0.00 0.0
1971 59 32 0.00 0.0
1970 52 36 0.00 0.0
1969 62 42 0.04 0.0
1968 43 32 0.31 0.0
1967 81 42 0.00 0.0
1966 86 48 0.00 0.0
1965 53 33 0.00 0.0
1964 62 37 0.00 0.0
1963 67 48 0.00 0.0
1962 72 49 0.19 0.0
1961 46 32 0.48 0.0
1960 59 42 0.00 0.0
1959 57 40 0.01 0.0
1958 76 34 0.00 0.0
1957 69 36 0.00 0.0
1956 60 40 0.00 0.0
1955 63 38 0.00 0.0
1954 85 34 0.00 0.0
1953 83 36 0.00 0.0
1952 81 48 0.00 0.0
1951 60 28 0.00 0.0
1950 75 43 0.00 0.0
1949 78 39 0.00 0.0
1948 78 42 0.00 0.0
All-Time Highest Temperatures in Idaho Falls on September 21
Rank Temperature Year
1 86 °F 1966
2 85 °F 1954
3 84 °F 1987
4 83 °F 1953
5 82 °F 1979
5 82 °F 2001
5 82 °F 2012
5 82 °F 2015
9 81 °F 1967
9 81 °F 1952
All-Time Lowest Temperatures in Idaho Falls on September 21
Rank Temperature Year
1 22 °F 1983
2 27 °F 1978
3 28 °F 1951
4 29 °F 1986
5 30 °F 2004
6 31 °F 2002
7 31 °F 2009
8 32 °F 1972
8 32 °F 1975
8 32 °F 1971
8 32 °F 1961
8 32 °F 2003
8 32 °F 1968
Lowest High Temperatures in Idaho Falls on September 21
Rank Temperature Year
1 43 °F 1968
2 46 °F 1961
2 46 °F 2017
4 52 °F 1970
5 53 °F 1965
6 55 °F 2006
6 55 °F 2004
8 56 °F 1984
9 57 °F 1959
10 58 °F 2005
10 58 °F 1986
All-Time Most Precipitation in Idaho Falls on September 21
Rank Precipitation Year
1 1.0 inches 2006
2 1.0 inches 2005
3 0.7 inches 2022
4 0.7 inches 2017
5 0.5 inches 1961
6 0.3 inches 1968
7 0.2 inches 2016
8 0.2 inches 1962
9 0.1 inches 1998
10 0.1 inches 1980
Weather Station Details
Years Station Coordinates
1948–2023 Idaho Falls Fanning Field location