St. Joseph weather in August: St. Joseph, Missouri: normal highs, lows, rain and records for August
St. Joseph in August has a normal high of 86°F and a normal low of 65°F, a daily mean of 75°F, falling from 88°F on the 1st to 84°F by the 31st. Measurable precipitation falls on 9 days in a normal August, 3.84 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 30°C and low of 18°C, 98 mm of precipitation in August.
- NOAA stationSt Joseph Rosecrans Airport
- Station IDUSW00013993
- Location39.77°N 94.92°W
- Elevation818 ft (249 m)
- From the center6 miles
- Population71,098
- Jan 37° 17°
- Feb 43° 21°
- Mar 55° 32°
- Apr 66° 42°
- May 76° 54°
- Jun 85° 64°
- Jul 88° 67°
- Aug 86° 65°
- Sep 80° 54°
- Oct 68° 43°
- Nov 53° 31°
- Dec 41° 21°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is St. Joseph in August?
The normal high is 86°F and the normal low 65°F, for a daily mean of 75.3°F. August is 2.4°F cooler than July and 8.3°F warmer than September. August is the 2nd warmest month of the year in St. Joseph and the 4th wettest. Across the month the normal high falls 4°F, from 88°F on August 1 to 84°F on August 31. From one year to the next August's mean temperature typically moves about 2.9°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 72°F and 78°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 31%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 88°F | 67°F | 30% | 16% |
| August 8 | 87°F | 67°F | 30% | 16% |
| August 15 | 87°F | 65°F | 31% | 16% |
| August 22 | 85°F | 63°F | 31% | 17% |
| August 31 | 84°F | 60°F | 31% | 17% |
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 | 30% | 16% | 14 h 20 min |
| August 2 | 88°F | 67°F | 30% | 16% | 14 h 10 min |
| August 3 | 88°F | 67°F | 30% | 16% | 14 h 10 min |
| August 4 | 88°F | 67°F | 30% | 16% | 14 h 10 min |
| August 5 | 88°F | 67°F | 30% | 16% | 14 h 10 min |
| August 6 | 88°F | 67°F | 30% | 16% | 14 h 10 min |
| August 7 | 88°F | 67°F | 30% | 16% | 14 h |
| August 8 | 87°F | 67°F | 30% | 16% | 14 h |
| August 9 | 87°F | 66°F | 30% | 16% | 14 h |
| August 10 | 87°F | 66°F | 30% | 16% | 14 h |
| August 11 | 87°F | 66°F | 30% | 16% | 14 h |
| August 12 | 87°F | 66°F | 30% | 16% | 13 h 50 min |
| August 13 | 87°F | 66°F | 30% | 16% | 13 h 50 min |
| August 14 | 87°F | 65°F | 30% | 16% | 13 h 50 min |
| August 15 | 87°F | 65°F | 31% | 16% | 13 h 50 min |
| August 16 | 86°F | 65°F | 31% | 17% | 13 h 40 min |
| August 17 | 86°F | 65°F | 31% | 17% | 13 h 40 min |
| August 18 | 86°F | 64°F | 31% | 17% | 13 h 40 min |
| August 19 | 86°F | 64°F | 31% | 17% | 13 h 40 min |
| August 20 | 86°F | 64°F | 31% | 17% | 13 h 40 min |
| August 21 | 86°F | 64°F | 31% | 17% | 13 h 30 min |
| August 22 | 85°F | 63°F | 31% | 17% | 13 h 30 min |
| August 23 | 85°F | 63°F | 31% | 17% | 13 h 30 min |
| August 24 | 85°F | 63°F | 31% | 17% | 13 h 30 min |
| August 25 | 85°F | 62°F | 31% | 17% | 13 h 20 min |
| August 26 | 85°F | 62°F | 31% | 17% | 13 h 20 min |
| August 27 | 85°F | 62°F | 31% | 17% | 13 h 20 min |
| August 28 | 84°F | 61°F | 31% | 17% | 13 h 20 min |
| August 29 | 84°F | 61°F | 31% | 17% | 13 h 10 min |
| August 30 | 84°F | 61°F | 31% | 17% | 13 h 10 min |
| August 31 | 84°F | 60°F | 31% | 17% | 13 h 10 min |
- Normal high
- 86°FAugust average
- Normal low
- 65°FAugust average
- Precipitation
- 3.84 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 10
- Daylight
- 14 h 20 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
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013993; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in St. Joseph in August?
On a given August day the chance of 0.01 inch or more is 30% on average, highest around August 24 (31%). In all, 3.84 in falls on 9 days of a normal August, 1 of them with an inch or more.
In a normal August in St. Joseph, 10 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013993.
What are the records for August in St. Joseph?
The warmest August temperature on this station's record (since 1908) is 110°F, on August 10, 1934; the coldest is 41°F, on August 28, 1986. The wettest August brought 11.54 in (1944).
The August mean against the 1991-2020 normal of 75.3°F: 2021 76.3°F (+1.0), 2022 73.9°F (−1.4), 2023 75.7°F (+0.4), 2024 75.7°F (+0.4), 2025 73.7°F (−1.6), 2026 77.1°F (+1.8). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 76.3°F | +1.0°F | 4.12 in |
| 2022 | 73.9°F | −1.4°F | 2.29 in |
| 2023 | 75.7°F | +0.4°F | 4.14 in |
| 2024 | 75.7°F | +0.4°F | 4.90 in |
| 2025 | 73.7°F | −1.6°F | 0.74 in |
| 2026 | 77.1°F | +1.8°F | 1.39 in |
Source: records: ACIS, station USW00013993; recent months: ACIS, station USW00013993. Records and recent months use complete months only.
How does August in St. Joseph 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. Joseph's is 86°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.