St. Peters weather in August: St. Peters, Missouri: normal highs, lows, rain and records for August
St. Peters in August has a normal high of 87°F and a normal low of 65°F, a daily mean of 76°F, falling from 88°F on the 1st to 86°F by the 31st. Measurable precipitation falls on 8 days in a normal August, 3.76 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 19°C, 96 mm of precipitation in August.
- NOAA stationSt Peters (2 mi SE)
- Station IDUSC00237475
- Location38.77°N 90.59°W
- Elevation575 ft (175 m)
- From the center1 miles
- Population61,398
- Jan 39° 21°
- Feb 45° 25°
- Mar 56° 33°
- Apr 67° 43°
- May 76° 54°
- Jun 84° 63°
- Jul 88° 68°
- Aug 87° 65°
- Sep 81° 57°
- Oct 69° 45°
- Nov 55° 35°
- Dec 44° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is St. Peters in August?
The normal high is 87°F and the normal low 65°F, for a daily mean of 76.3°F. August is 1.5°F cooler than July and 7.4°F warmer than September. August is the 2nd warmest month of the year in St. Peters and the 5th wettest. Across the month the normal high falls 2°F, from 88°F on August 1 to 86°F on August 31. From one year to the next August's mean temperature typically moves about 2.8°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 74°F and 79°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 27%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 88°F | 67°F | 26% | 17% |
| August 8 | 88°F | 67°F | 26% | 18% |
| August 15 | 88°F | 66°F | 26% | 18% |
| August 22 | 87°F | 65°F | 27% | 18% |
| August 31 | 86°F | 63°F | 27% | 18% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 88°F | 67°F | 26% | 17% | 14 h 10 min |
| August 2 | 88°F | 67°F | 26% | 17% | 14 h 10 min |
| August 3 | 88°F | 67°F | 26% | 17% | 14 h 10 min |
| August 4 | 88°F | 67°F | 26% | 17% | 14 h 10 min |
| August 5 | 88°F | 67°F | 26% | 18% | 14 h |
| August 6 | 88°F | 67°F | 26% | 18% | 14 h |
| August 7 | 88°F | 67°F | 26% | 18% | 14 h |
| August 8 | 88°F | 67°F | 26% | 18% | 14 h |
| August 9 | 88°F | 67°F | 26% | 18% | 14 h |
| August 10 | 88°F | 66°F | 26% | 18% | 13 h 50 min |
| August 11 | 88°F | 66°F | 26% | 18% | 13 h 50 min |
| August 12 | 88°F | 66°F | 26% | 18% | 13 h 50 min |
| August 13 | 88°F | 66°F | 26% | 18% | 13 h 50 min |
| August 14 | 88°F | 66°F | 26% | 18% | 13 h 50 min |
| August 15 | 88°F | 66°F | 26% | 18% | 13 h 40 min |
| August 16 | 87°F | 66°F | 26% | 18% | 13 h 40 min |
| August 17 | 87°F | 66°F | 26% | 18% | 13 h 40 min |
| August 18 | 87°F | 65°F | 27% | 18% | 13 h 40 min |
| August 19 | 87°F | 65°F | 27% | 18% | 13 h 30 min |
| August 20 | 87°F | 65°F | 27% | 18% | 13 h 30 min |
| August 21 | 87°F | 65°F | 27% | 18% | 13 h 30 min |
| August 22 | 87°F | 65°F | 27% | 18% | 13 h 30 min |
| August 23 | 87°F | 65°F | 27% | 18% | 13 h 30 min |
| August 24 | 87°F | 64°F | 27% | 18% | 13 h 20 min |
| August 25 | 87°F | 64°F | 27% | 18% | 13 h 20 min |
| August 26 | 87°F | 64°F | 27% | 18% | 13 h 20 min |
| August 27 | 86°F | 64°F | 27% | 18% | 13 h 20 min |
| August 28 | 86°F | 63°F | 27% | 18% | 13 h 10 min |
| August 29 | 86°F | 63°F | 27% | 18% | 13 h 10 min |
| August 30 | 86°F | 63°F | 27% | 18% | 13 h 10 min |
| August 31 | 86°F | 63°F | 27% | 18% | 13 h 10 min |
- Normal high
- 87°FAugust average
- Normal low
- 65°FAugust average
- Precipitation
- 3.76 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 11
- Daylight
- 14 h 10 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 27
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00237475; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in St. Peters in August?
On a given August day the chance of 0.01 inch or more is 26% on average, highest around August 30 (27%). In all, 3.76 in falls on 8 days of a normal August, 1 of them with an inch or more.
In a normal August in St. Peters, 11 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00237475.
How does August in St. Peters compare across Missouri?
Across the 134 places PlainClimate covers in Missouri, August normal highs run from 83°F in Canton to 91°F in Malden; St. Peters's is 87°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.