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| Weather in September in Saint Louis, Missouri |  |
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< September > |
| Normal Max/ High Temperature |
27°C (81°F) |
| Average Temperature |
21°C (69°F) |
| Min/ Low Temperature |
14°C (57°F) |
| Normal Precipitation |
71mm (2.8in) |
| Number of Wet Days (probability of rain on a day) |
7 (23%) |
| Average Sunlight per day |
08:25 |
| Average Daylight per day |
12:23 |
| Sunny (Cloudy) Daylight Hours |
69% (31%) |
| Sun altitude at solar noon on the 21st day. |
51.8° |
- The average temperature in Saint Louis, Missouri in September is warm at 20.5 °C (68.9 °F).
- Afternoons can be hot with average high temperatures reaching 27 °C (80.6 °F).
- Overnight temperatures are generally mild with an average low of 14 °C (57.2 °F).
- In September the mean daily temperature range/ variation is 13 °C (23.4 °F).
- The weather in September is somewhat dry with sporadic rain. Just 71mm (2.8in) of H2O is released during on average 7 days.
- In September the skies in Saint Louis, Missouri are moderately sunny with an average of a respectable 8:25 of splendid sunshine per day.
- The shortest day is 11:46 long and the longest day is 13:00 long with an average length of 12:23.
- There are approximately 3:48 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
- It is sunny approximately 68.8% of daylight hours and cloudy 31.2% of daylight hours.
Check the distance to and compare the Saint Louis, Missouri September averages with somewhere beginning with:
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Weather Trend Graph for September in Saint Louis, Missouri, Usa

Navigate to September Weather in Locations Surrounding Saint Louis, Missouri:
| - Carlinville, Il, Usa - 73.1 kms (45.4 miles) NE
- White Halle, Il, Usa - 43.3 kms (26.9 miles) NE
- Windsor, Il, Usa - 122.9 kms (76.4 miles) ENE
- Hillsboro, Il, Usa - 122.9 kms (76.4 miles) ENE
- St. Louis/ Lambert, Mo, Usa - 1.4 kms (0.9 miles) E
- Sparta, Il, Usa - 89.4 kms (55.6 miles) SE
- Farmington, Mo, Usa - 89.8 kms (55.8 miles) SSE
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