Eureka climate

Eureka Weather in September

NOAA 1991-2020 normals for St Louis Sprt Of S L AP, 17.3 km from Eureka

Average highs run from 85°F on September 1 to 76°F on September 30, and lows from 62°F to 51°F. Normal precipitation for the month is 3.02 in over about 9 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
81°F
Average low
57°F
Precipitation
3.02 in
Record high
102°FSep 5, 2026
Record low
32°FSep 23, 1995
Chance of a freeze
2%
Days of 90°F or more
4.8
Daylight
13 h 00 min to 11 h 49 min
Cloud cover
46%
Humidity
68%
Dew point
56°F
Wind
5.1 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 185°F62°F101°F 201148°F 200930%0%
Sep 285°F61°F99°F 201147°F 201730%0%
Sep 385°F61°F99°F 201151°F 200930%0%
Sep 485°F61°F100°F 202650°F 202430%0%
Sep 584°F60°F102°F 202648°F 198830%0%
Sep 684°F60°F100°F 199043°F 198831%0%
Sep 784°F60°F96°F 200243°F 198831%0%
Sep 884°F59°F93°F 200240°F 202431%0%
Sep 983°F59°F98°F 201341°F 202431%0%
Sep 1083°F59°F98°F 201343°F 202431%0%
Sep 1183°F58°F97°F 200045°F 201731%0%
Sep 1282°F58°F96°F 199146°F 199231%0%
Sep 1382°F58°F97°F 202543°F 201431%0%
Sep 1482°F57°F98°F 202542°F 201431%0%
Sep 1581°F57°F97°F 202640°F 200731%0%
Sep 1681°F56°F94°F 201943°F 200031%0%
Sep 1781°F56°F97°F 202641°F 199931%0%
Sep 1880°F56°F95°F 202545°F 199931%0%
Sep 1980°F55°F94°F 200040°F 199131%0%
Sep 2080°F55°F96°F 201739°F 199132%0%
Sep 2179°F54°F95°F 202236°F 199132%0%
Sep 2279°F54°F94°F 200536°F 199532%0%
Sep 2378°F54°F92°F 200732°F 199532%0%
Sep 2478°F53°F92°F 201732°F 198932%0%
Sep 2578°F53°F92°F 201734°F 198932%0%
Sep 2677°F53°F91°F 201737°F 200132%0%
Sep 2777°F52°F92°F 201940°F 198931%0%
Sep 2877°F52°F90°F 202137°F 198931%0%
Sep 2976°F51°F91°F 201936°F 199231%0%
Sep 3076°F51°F92°F 201935°F 199931%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.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:32 AM, sunset 7:32 PM
September 30
sunrise 6:58 AM, sunset 6:47 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00003966 (St Louis Sprt Of S L AP), public domain. Records: NOAA GHCN-Daily, station USW00003966, 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.