Eureka, MO Weather & Climate Normals
What a normal year in Eureka actually looks like
On the 30-year record NOAA keeps for Eureka, MO, the comfort score comes out to 49/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Eureka's weather actually swings
Average temperatures in Eureka run from 32°F in Jan up to 79°F in Jul, a 47.3°F seasonal swing, one of the widest gaps in this dataset.
Eureka, month by month
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 41°F | 22°F | 2.38in |
| Feb | 47°F | 26°F | 1.98in |
| Mar | 57°F | 34°F | 3.48in |
| Apr | 68°F | 44°F | 4.58in |
| May | 77°F | 55°F | 4.56in |
| Jun | 86°F | 64°F | 4.31in |
| Jul | 90°F | 68°F | 3.3in |
| Aug | 88°F | 66°F | 3.44in |
| Sep | 81°F | 57°F | 3.02in |
| Oct | 70°F | 45°F | 3.1in |
| Nov | 56°F | 34°F | 3.28in |
| Dec | 45°F | 26°F | 2.32in |
If you're timing a visit, Apr, May, Jun, Sep, and Oct are Eureka's mildest stretch; if you're moving there, you should plan around Jul's heat and Jan's cold instead.
How wet Eureka actually gets
Eureka averages 39.75in of precipitation a year across roughly 116 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Eureka against the rest of the country
Out of 4876 cities scored here, Eureka comes in at 2163; within MO alone it ranks 22 of 135. Population is about 13,277.
Checking the actual forecast
These figures come from St Louis Sprt Of S L Ap, MO US, the NOAA station 11.0 miles from Eureka, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is