39.601°N, 116.005°W · station P68thr · 64 years of record
41°F
COLDEST SEP 3 SINCE 2021
forecast low · Sep 3
7-Day Forecast
NWS NDFD forecast low temperature for Eureka.
This Day in History
Every year's low on each of the next 7 forecast dates at Eureka — toggle a day below. The forecast line shows where it lands; the ringed bar is the coldest on record.
Ranks
#20 / 49
coldest Sep 2 in 49 yrs of record
Coldest Sep 2 ever
29°F
set in 2008
Mildest Sep 2 ever
57°F
set in 1995
Forecast low 42°F — 20th coldest Sep 2 of 49 years · record 29°F (2008) · coldest since 2020.
Ranks
#17 / 50
coldest Sep 3 in 50 yrs of record
Coldest Sep 3 ever
24°F
set in 1971
Mildest Sep 3 ever
60°F
set in 2025
Forecast low 41°F — 17th coldest Sep 3 of 50 years · record 24°F (1971) · coldest since 2021.
Ranks
#28 / 49
coldest Sep 4 in 49 yrs of record
Coldest Sep 4 ever
26°F
set in 1999
Mildest Sep 4 ever
57°F
set in 1998
Forecast low 44°F — 28th coldest Sep 4 of 49 years · record 26°F (1999) · coldest since 2023.
Ranks
#36 / 51
coldest Sep 5 in 51 yrs of record
Coldest Sep 5 ever
28°F
set in 1968
Mildest Sep 5 ever
63°F
set in 2013
Forecast low 47°F — 36th coldest Sep 5 of 51 years · record 28°F (1968) · coldest since 2024.
Ranks
#44 / 50
coldest Sep 6 in 50 yrs of record
Coldest Sep 6 ever
24°F
set in 2010
Mildest Sep 6 ever
57°F
set in 2013
Forecast low 49°F — 44th coldest Sep 6 of 50 years · record 24°F (2010) · coldest since 2025.
Ranks
#37 / 52
coldest Sep 7 in 52 yrs of record
Coldest Sep 7 ever
29°F
set in 1996
Mildest Sep 7 ever
59°F
set in 2022
Forecast low 46°F — 37th coldest Sep 7 of 52 years · record 29°F (1996) · coldest since 2024.
Ranks
#31 / 53
coldest Sep 8 in 53 yrs of record
Coldest Sep 8 ever
25°F
set in 2001
Mildest Sep 8 ever
57°F
set in 1998
Forecast low 44°F — 31st coldest Sep 8 of 53 years · record 25°F (2001) · coldest since 2025.
The hottest and coldest ever recorded at Eureka in each calendar month, and for the whole 1963–2026 record — with the year each was set.
Month
Record High
Record Low
Jan
63°FJan 31, 2003
-36°FJan 7, 1982
Feb
69°FFeb 13, 2015
-37°FFeb 6, 1982
Mar
84°FMar 25, 2026
-33°FMar 9, 1969
Apr
86°FApr 22, 2012
-3°FApr 2, 1982
May
95°FMay 28, 2003
9°FMay 6, 1965
Jun
101°FJun 29, 2013
19°FJun 4, 2001
Jul
105°FJul 5, 1985
26°FJul 10, 1983
Aug
101°FAug 1, 2026
23°FAug 23, 1968
Sep
99°FSep 5, 2020
12°FSep 22, 1968
Oct
93°FOct 2, 1980
-9°FOct 30, 2019
Nov
75°FNov 4, 2010
-14°FNov 29, 2006
Dec
66°FDec 19, 2025
-34°FDec 22, 1990
All-time
105°FJul 5, 1985
-37°FFeb 6, 1982
2026 Records So Far
Records set or tied at Eureka so far this year — through Aug 30.
Record Highs in 2026
18 broke
plus 7 tied — daily record highs set this year
Monthly high records this year: Mar (84°F), Aug (101°F)
Record Lows in 2026
1 broke
plus 3 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
68°F
record high minimum — the night it never cooled · Aug 8, 1971
Coldest high ever
2°F
record low maximum — the day it never warmed · Dec 22, 1990
Month
Warmest low
Coldest high
Jan
39°FJan 21, 1969
7°FJan 7, 1982
Feb
45°FFeb 6, 2015
11°FFeb 6, 1989
Mar
49°FMar 20, 2017
22°FMar 3, 1966
Apr
47°FApr 17, 1984
28°FApr 1, 1999
May
57°FMay 17, 2020
36°FMay 6, 1964
Jun
68°FJun 28, 2015
45°FJun 8, 1995
Jul
66°FJul 24, 2007
63°FJul 1, 1992
Aug
68°FAug 8, 1971
58°FAug 23, 1968
Sep
63°FSep 5, 2013
40°FSep 30, 1982
Oct
55°FOct 10, 2025
27°FOct 18, 1984
Nov
51°FNov 6, 2020
16°FNov 29, 2004
Dec
43°FDec 11, 2014
2°FDec 22, 1990
All-time
68°FAug 8, 1971
2°FDec 22, 1990
Cold Streaks
Current run
0 days
consecutive days with a low ≤ 32°F
Longest ever
147 days
record run, ended Apr 8 2002
So far in 2026
109 days
days with a low ≤ 32°F this year
Climate Normals
Normal low & low by month, from Eureka's own 1991–2020 record. Today's normal low: 44°F · forecast is -3° vs normal.