Eureka climate

Eureka Weather in August

NOAA 1991-2020 normals for Eureka RS, 2.1 km from Eureka

Average highs run from 90°F on August 1 to 81°F on August 31, and lows from 54°F to 48°F. Normal precipitation for the month is 1.05 in over about 5 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
86°F
Average low
51°F
Precipitation
1.05 in
Record high
105°FAug 4, 1961
Record low
30°FAug 25, 1910
Chance of a freeze
1%
Days of 90°F or more
11.2
Daylight
15 h 04 min to 13 h 28 min
Cloud cover
49%
Humidity
58%
Dew point
43°F
Wind
4.0 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 190°F54°F101°F 201537°F 195317%0%
Aug 289°F54°F99°F 196136°F 196317%0%
Aug 389°F54°F101°F 196138°F 190017%0%
Aug 489°F54°F105°F 196132°F 189617%0%
Aug 589°F54°F103°F 196138°F 202617%0%
Aug 689°F53°F95°F 196337°F 198017%0%
Aug 789°F53°F96°F 198335°F 196917%0%
Aug 889°F53°F98°F 193037°F 191717%0%
Aug 988°F53°F98°F 200035°F 191417%0%
Aug 1088°F53°F100°F 201837°F 194717%0%
Aug 1188°F53°F98°F 197138°F 199717%0%
Aug 1288°F52°F97°F 197135°F 200017%0%
Aug 1387°F52°F97°F 201534°F 200517%0%
Aug 1487°F52°F96°F 199233°F 194917%0%
Aug 1587°F52°F98°F 202136°F 201717%0%
Aug 1686°F51°F98°F 196235°F 190517%0%
Aug 1786°F51°F100°F 202332°F 196917%0%
Aug 1886°F51°F99°F 200833°F 197317%0%
Aug 1985°F51°F97°F 196734°F 199617%0%
Aug 2085°F51°F96°F 189832°F 200017%0%
Aug 2185°F50°F95°F 196933°F 196617%0%
Aug 2284°F50°F96°F 196933°F 200018%0%
Aug 2384°F50°F98°F 196931°F 196218%0%
Aug 2484°F50°F103°F 196933°F 199218%0%
Aug 2583°F49°F99°F 198130°F 191018%0%
Aug 2683°F49°F98°F 198132°F 199118%0%
Aug 2783°F49°F95°F 197133°F 199519%0%
Aug 2882°F48°F93°F 198630°F 200019%0%
Aug 2982°F48°F95°F 197231°F 196919%0%
Aug 3082°F48°F94°F 192931°F 195919%0%
Aug 3181°F48°F92°F 192931°F 199919%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.051015201102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

August 1
sunrise 6:14 AM, sunset 9:18 PM
August 31
sunrise 6:56 AM, sunset 8:24 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00242827 (Eureka RS), public domain. Records: NOAA GHCN-Daily, station USC00244558, 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.