44.523°N, 114.216°W · station LLJthr · 132 years of record
81°F
HOTTEST SEP 1 SINCE 2025
forecast high · Sep 1
7-Day Forecast
NWS NDFD forecast high temperature for Challis.
This Day in History
Every year's high on each of the next 7 forecast dates at Challis — toggle a day below. The forecast line shows where it lands; the ringed bar is the hottest on record.
Ranks
#54 / 107
warmest Sep 1 in 107 yrs of record
Warmest Sep 1 ever
95°F
set in 2019
Coolest Sep 1 ever
56°F
set in 1973
Forecast high 81°F — 54th warmest Sep 1 of 107 years · record 95°F (2019) · warmest since 2025.
Ranks
#87 / 108
warmest Sep 2 in 108 yrs of record
Warmest Sep 2 ever
93°F
set in 2007
Coolest Sep 2 ever
55°F
set in 2008
Forecast high 74°F — 87th warmest Sep 2 of 108 years · record 93°F (2007) · warmest since 2025.
Ranks
#88 / 108
warmest Sep 3 in 108 yrs of record
Warmest Sep 3 ever
99°F
set in 2022
Coolest Sep 3 ever
58°F
set in 2000
Forecast high 72°F — 88th warmest Sep 3 of 108 years · record 99°F (2022) · warmest since 2025.
Ranks
#87 / 109
warmest Sep 4 in 109 yrs of record
Warmest Sep 4 ever
97°F
set in 2022
Coolest Sep 4 ever
55°F
set in 2000
Forecast high 73°F — 87th warmest Sep 4 of 109 years · record 97°F (2022) · warmest since 2025.
Ranks
#66 / 109
warmest Sep 5 in 109 yrs of record
Warmest Sep 5 ever
96°F
set in 2020
Coolest Sep 5 ever
60°F
set in 2015
Forecast high 78°F — 66th warmest Sep 5 of 109 years · record 96°F (2020) · warmest since 2024.
Ranks
#68 / 108
warmest Sep 6 in 108 yrs of record
Warmest Sep 6 ever
99°F
set in 2022
Coolest Sep 6 ever
55°F
set in 1929
Forecast high 76°F — 68th warmest Sep 6 of 108 years · record 99°F (2022) · warmest since 2025.
Ranks
#77 / 108
warmest Sep 7 in 108 yrs of record
Warmest Sep 7 ever
97°F
set in 2022
Coolest Sep 7 ever
57°F
set in 1984
Forecast high 74°F — 77th warmest Sep 7 of 108 years · record 97°F (2022) · warmest since 2025.
The hottest and coldest ever recorded at Challis in each calendar month, and for the whole 1895–2026 record — with the year each was set.
Month
Record High
Record Low
Jan
60°FJan 1, 1898
-33°FJan 25, 1949
Feb
65°FFeb 26, 1950
-31°FFeb 9, 1933
Mar
75°FMar 19, 2026
-16°FMar 1, 1922
Apr
87°FApr 16, 1915
3°FApr 1, 1936
May
96°FMay 28, 2003
15°FMay 5, 1915
Jun
100°FJun 23, 1992
24°FJun 1, 1920
Jul
103°FJul 26, 1964
31°FJul 2, 1955
Aug
103°FAug 4, 1961
20°FAug 30, 1927
Sep
99°FSep 3, 2022
17°FSep 24, 1926
Oct
89°FOct 14, 1927
-4°FOct 31, 2002
Nov
75°FNov 1, 1937
-17°FNov 24, 1985
Dec
63°FDec 2, 2021
-34°FDec 23, 1983
All-time
103°FAug 4, 1961
-34°FDec 23, 1983
2026 Records So Far
Records set or tied at Challis so far this year — through Aug 30.
Record Highs in 2026
4 broke
plus 4 tied — daily record highs set this year
Monthly high record this year: Mar (75°F)
Record Lows in 2026
0 broke
plus 1 tied — daily record lows set this year
Record Warm Nights & Cold Days
Two more daily records, kept separate from the rankings: the warmest a night has ever stayed (record high minimum) and the coldest a day has ever gotten (record low maximum) — the flip side of the usual record high and low.
Warmest low ever
75°F
record high minimum — the night it never cooled · Aug 9, 1928
Coldest high ever
-14°F
record low maximum — the day it never warmed · Dec 22, 1983
Month
Warmest low
Coldest high
Jan
40°FJan 17, 1896
-11°FJan 22, 1930
Feb
41°FFeb 7, 1996
-6°FFeb 9, 1933
Mar
46°FMar 25, 2026
11°FMar 1, 1960
Apr
56°FApr 30, 1992
29°FApr 4, 1918
May
58°FMay 28, 1986
39°FMay 6, 2010
Jun
65°FJun 6, 1926
45°FJun 7, 1924
Jul
70°FJul 23, 2006
58°FJul 5, 1982
Aug
75°FAug 9, 1928
58°FAug 20, 1968
Sep
61°FSep 4, 1945
38°FSep 25, 1934
Oct
55°FOct 9, 1955
14°FOct 31, 2002
Nov
53°FNov 7, 2006
4°FNov 25, 1985
Dec
43°FDec 18, 1917
-14°FDec 22, 1983
All-time
75°FAug 9, 1928
-14°FDec 22, 1983
Hot Streaks
Current run
0 days
consecutive days with a high ≥ 90°F
Longest ever
29 days
record run, ended Aug 2 2018
So far in 2026
35 days
days with a high ≥ 90°F this year
Climate Normals
Normal high & low by month, from Challis's own 1991–2020 record. Today's normal high: 81°F · forecast is +0° vs normal.
Challis's observed daily high for the last six weeks — a white ring marks any day that broke or tied its daily record for that date.
2026 So Far
Every day this year against Challis's own record — the record high, the normal, and the full span ever seen. A shareable look at where the year stands.