39.601°N, 116.005°W · station P68thr · 64 years of record
67°F
HOTTEST OCT 17 SINCE 2024
forecast high · Oct 17
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
#23 / 52
warmest Oct 17 in 52 yrs of record
Warmest Oct 17 ever
81°F
set in 2003
Coolest Oct 17 ever
43°F
set in 1968
Forecast high 67°F — 23rd warmest Oct 17 of 52 years · record 81°F (2003) · warmest since 2024.
Ranks
#24 / 50
warmest Oct 18 in 50 yrs of record
Warmest Oct 18 ever
80°F
set in 2003
Coolest Oct 18 ever
29°F
set in 1984
Forecast high 66°F — 24th warmest Oct 18 of 50 years · record 80°F (2003) · warmest since 2025.
Ranks
#32 / 51
warmest Oct 19 in 51 yrs of record
Warmest Oct 19 ever
79°F
set in 2023
Coolest Oct 19 ever
27°F
set in 1984
Forecast high 62°F — 32nd warmest Oct 19 of 51 years · record 79°F (2023) · warmest since 2025.
Ranks
#47 / 52
warmest Oct 20 in 52 yrs of record
Warmest Oct 20 ever
81°F
set in 2003
Coolest Oct 20 ever
31°F
set in 1984
Forecast high 55°F — 47th warmest Oct 20 of 52 years · record 81°F (2003) · warmest since 2025.
Ranks
#46 / 50
warmest Oct 21 in 50 yrs of record
Warmest Oct 21 ever
83°F
set in 2003
Coolest Oct 21 ever
37°F
set in 1996
Forecast high 50°F — 46th warmest Oct 21 of 50 years · record 83°F (2003) · warmest since 2025.
Ranks
#47 / 50
warmest Oct 22 in 50 yrs of record
Warmest Oct 22 ever
83°F
set in 2003
Coolest Oct 22 ever
45°F
set in 1984
Forecast high 48°F — 47th warmest Oct 22 of 50 years · record 83°F (2003) · warmest since 2025.
Ranks
#47 / 50
warmest Oct 23 in 50 yrs of record
Warmest Oct 23 ever
75°F
set in 1965
Coolest Oct 23 ever
36°F
set in 2022
Forecast high 49°F — 47th warmest Oct 23 of 50 years · record 75°F (1965) · 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 Oct 15.
Record Highs in 2026
19 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
54 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: 66°F · forecast is +1° vs normal.