Eureka climate

Eureka Weather in August

NOAA 1991-2020 normals for Eureka, 0.4 km from Eureka

Average highs run from 87°F on August 1 to 81°F on August 31, and lows from 55°F to 49°F. Normal precipitation for the month is 0.64 in over about 3 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Eureka, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
84°F
Average low
52°F
Precipitation
0.64 in
Record high
101°FAug 1, 2026
Record low
29°FAug 31, 2005
Chance of a freeze
0%
Days of 90°F or more
3.4
Daylight
14 h 12 min to 13 h 05 min
Cloud cover
37%
Humidity
26%
Dew point
30°F
Wind
7.4 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 187°F55°F101°F 202642°F 199810%0%
Aug 286°F55°F100°F 202642°F 200610%0%
Aug 386°F55°F96°F 201742°F 200410%0%
Aug 486°F55°F96°F 201243°F 202310%0%
Aug 586°F54°F98°F 202639°F 200210%0%
Aug 686°F54°F100°F 202640°F 200910%0%
Aug 786°F54°F99°F 202633°F 200910%0%
Aug 886°F54°F97°F 201836°F 200210%0%
Aug 986°F54°F99°F 201837°F 200210%0%
Aug 1086°F54°F100°F 201839°F 200210%0%
Aug 1185°F54°F98°F 201838°F 201010%0%
Aug 1285°F53°F96°F 200439°F 201010%0%
Aug 1385°F53°F95°F 200743°F 200010%0%
Aug 1485°F53°F96°F 200740°F 199910%0%
Aug 1585°F53°F96°F 202034°F 199910%0%
Aug 1684°F53°F99°F 202035°F 200910%0%
Aug 1784°F52°F100°F 202035°F 200910%0%
Aug 1884°F52°F99°F 202039°F 200610%0%
Aug 1984°F52°F96°F 202039°F 199810%0%
Aug 2084°F52°F97°F 200936°F 202110%0%
Aug 2183°F51°F98°F 200935°F 200210%0%
Aug 2283°F51°F94°F 202036°F 200210%0%
Aug 2383°F51°F95°F 202036°F 201010%0%
Aug 2483°F51°F94°F 200834°F 199810%0%
Aug 2582°F51°F96°F 200737°F 201610%0%
Aug 2682°F50°F96°F 201036°F 202410%0%
Aug 2782°F50°F95°F 200134°F 200410%0%
Aug 2882°F50°F94°F 200137°F 200410%0%
Aug 2981°F50°F95°F 199834°F 201010%0%
Aug 3081°F49°F93°F 199836°F 200510%0%
Aug 3181°F49°F94°F 201929°F 200510%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Eureka, in percent, and of at least 0.1 inch of snowfall.02.557.51012.51102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

August 1
sunrise 5:44 AM, sunset 7:56 PM
August 31
sunrise 6:11 AM, sunset 7:16 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00262708 (Eureka), public domain. Records: NOAA GHCN-Daily, station USW00003170, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.