Eureka climate

Eureka Weather in September

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

Average highs run from 78°F on September 1 to 65°F on September 30, and lows from 52°F to 39°F. Normal precipitation for the month is 1.79 in over about 6 wet days.

September 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

September at a glance

Average high
72°F
Average low
46°F
Precipitation
1.79 in
Record high
102°FSep 7, 2002
Record low
25°FSep 24, 2000
Chance of a freeze
64%
Days of 90°F or more
1.3
Daylight
13 h 16 min to 11 h 44 min
Cloud cover
53%
Humidity
61%
Dew point
45°F
Wind
11.6 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
Sep 178°F52°F101°F 201246°F 200521%0%
Sep 277°F51°F101°F 202340°F 200821%0%
Sep 377°F51°F99°F 200537°F 200821%0%
Sep 477°F51°F99°F 200541°F 201121%0%
Sep 576°F50°F100°F 200136°F 202521%0%
Sep 676°F50°F97°F 200234°F 202521%0%
Sep 776°F50°F102°F 200238°F 200421%0%
Sep 875°F49°F94°F 202237°F 200821%0%
Sep 975°F49°F94°F 202431°F 202021%0%
Sep 1075°F48°F101°F 199838°F 202021%0%
Sep 1174°F48°F92°F 200538°F 201521%0%
Sep 1274°F48°F97°F 201738°F 201421%0%
Sep 1373°F47°F94°F 201536°F 201221%0%
Sep 1473°F47°F93°F 200634°F 201421%0%
Sep 1573°F46°F93°F 201537°F 201121%0%
Sep 1672°F46°F95°F 200241°F 201021%
Sep 1772°F45°F94°F 199837°F 201021%
Sep 1871°F45°F97°F 199833°F 200321%
Sep 1971°F45°F93°F 200432°F 200320%
Sep 2070°F44°F91°F 200534°F 200620%
Sep 2170°F44°F94°F 201530°F 201120%
Sep 2269°F43°F92°F 201326°F 201220%
Sep 2369°F43°F89°F 200728°F 200020%
Sep 2468°F42°F87°F 201425°F 200020%
Sep 2568°F42°F93°F 201429°F 200020%
Sep 2667°F41°F99°F 202426°F 200220%
Sep 2767°F41°F90°F 202134°F 199920%
Sep 2866°F40°F95°F 202432°F 200620%
Sep 2966°F40°F99°F 202431°F 200320%
Sep 3065°F39°F90°F 200526°F 200320%

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.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 7:00 AM, sunset 8:16 PM
September 30
sunrise 7:36 AM, sunset 7:20 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00392797 (Eureka), public domain. Records: NOAA GHCN-Daily, station USW00094052, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.