39.601°N, 116.005°W · station P68thr · 64 years of record
82°F
HOTTEST SEP 3 SINCE 2024
forecast high · Sep 3
7-Day Forecast
NWS NDFD forecast high temperature for Eureka.
This Day in History
Every year's high 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 hottest on record.
Ranks
#43 / 53
warmest Sep 1 in 53 yrs of record
Warmest Sep 1 ever
96°F
set in 2022
Coolest Sep 1 ever
60°F
set in 1984
Forecast high 81°F — 43rd warmest Sep 1 of 53 years · record 96°F (2022) · warmest since 2025.
Ranks
#39 / 48
warmest Sep 2 in 48 yrs of record
Warmest Sep 2 ever
95°F
set in 2022
Coolest Sep 2 ever
64°F
set in 2008
Forecast high 79°F — 39th warmest Sep 2 of 48 years · record 95°F (2022) · warmest since 2025.
Ranks
#38 / 51
warmest Sep 3 in 51 yrs of record
Warmest Sep 3 ever
96°F
set in 2022
Coolest Sep 3 ever
70°F
set in 1999
Forecast high 82°F — 38th warmest Sep 3 of 51 years · record 96°F (2022) · warmest since 2024.
Ranks
#32 / 50
warmest Sep 4 in 50 yrs of record
Warmest Sep 4 ever
95°F
set in 2022
Coolest Sep 4 ever
62°F
set in 2004
Forecast high 81°F — 32nd warmest Sep 4 of 50 years · record 95°F (2022) · warmest since 2025.
Ranks
#38 / 51
warmest Sep 5 in 51 yrs of record
Warmest Sep 5 ever
98°F
set in 2022
Coolest Sep 5 ever
69°F
set in 1985
Forecast high 80°F — 38th warmest Sep 5 of 51 years · record 98°F (2022) · warmest since 2025.
Ranks
#40 / 50
warmest Sep 6 in 50 yrs of record
Warmest Sep 6 ever
99°F
set in 2020
Coolest Sep 6 ever
52°F
set in 1970
Forecast high 77°F — 40th warmest Sep 6 of 50 years · record 99°F (2020) · warmest since 2025.
Ranks
#43 / 51
warmest Sep 7 in 51 yrs of record
Warmest Sep 7 ever
98°F
set in 2020
Coolest Sep 7 ever
61°F
set in 1970
Forecast high 77°F — 43rd warmest Sep 7 of 51 years · record 98°F (2020) · warmest 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
Hot Streaks
Current run
0 days
consecutive days with a high ≥ 90°F
Longest ever
23 days
record run, ended Aug 10 2000
So far in 2026
53 days
days with a high ≥ 90°F this year
Climate Normals
Normal high & low by month, from Eureka's own 1991–2020 record. Today's normal high: 84°F · forecast is -2° vs normal.