Watertown weather in August: Watertown, South Dakota: normal highs, lows, rain and records for August
Watertown in August has a normal high of 80°F and a normal low of 58°F, a daily mean of 69°F, falling from 82°F on the 1st to 77°F by the 31st. Measurable precipitation falls on 9 days in a normal August, 2.89 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 14°C, 73 mm of precipitation in August.
- NOAA stationWatertown Regional Airport
- Station IDUSW00014946
- Location44.90°N 97.15°W
- Elevation1,748 ft (533 m)
- Population23,492
- Jan 21° 3°
- Feb 26° 7°
- Mar 39° 20°
- Apr 54° 32°
- May 67° 45°
- Jun 77° 55°
- Jul 82° 60°
- Aug 80° 58°
- Sep 72° 49°
- Oct 56° 35°
- Nov 40° 21°
- Dec 26° 9°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Watertown in August?
The normal high is 80°F and the normal low 58°F, for a daily mean of 68.5°F. August is 2.5°F cooler than July and 8.4°F warmer than September. August is the 2nd warmest month of the year in Watertown and the 3rd wettest. Across the month the normal high falls 5°F, from 82°F on August 1 to 77°F on August 31. From one year to the next August's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 66°F and 71°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 29%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 82°F | 60°F | 29% | 18% |
| August 8 | 81°F | 59°F | 29% | 17% |
| August 15 | 80°F | 58°F | 28% | 16% |
| August 22 | 79°F | 57°F | 28% | 15% |
| August 31 | 77°F | 54°F | 28% | 15% |
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 | 82°F | 60°F | 29% | 18% | 14 h 40 min |
| August 2 | 82°F | 60°F | 29% | 18% | 14 h 40 min |
| August 3 | 82°F | 60°F | 29% | 17% | 14 h 40 min |
| August 4 | 81°F | 60°F | 29% | 17% | 14 h 40 min |
| August 5 | 81°F | 59°F | 29% | 17% | 14 h 30 min |
| August 6 | 81°F | 59°F | 29% | 17% | 14 h 30 min |
| August 7 | 81°F | 59°F | 29% | 17% | 14 h 30 min |
| August 8 | 81°F | 59°F | 29% | 17% | 14 h 30 min |
| August 9 | 81°F | 59°F | 29% | 17% | 14 h 20 min |
| August 10 | 81°F | 59°F | 29% | 17% | 14 h 20 min |
| August 11 | 80°F | 59°F | 28% | 17% | 14 h 20 min |
| August 12 | 80°F | 58°F | 28% | 16% | 14 h 20 min |
| August 13 | 80°F | 58°F | 28% | 16% | 14 h 10 min |
| August 14 | 80°F | 58°F | 28% | 16% | 14 h 10 min |
| August 15 | 80°F | 58°F | 28% | 16% | 14 h 10 min |
| August 16 | 80°F | 58°F | 28% | 16% | 14 h 10 min |
| August 17 | 80°F | 58°F | 28% | 16% | 14 h |
| August 18 | 79°F | 57°F | 28% | 16% | 14 h |
| August 19 | 79°F | 57°F | 28% | 15% | 14 h |
| August 20 | 79°F | 57°F | 28% | 15% | 13 h 50 min |
| August 21 | 79°F | 57°F | 28% | 15% | 13 h 50 min |
| August 22 | 79°F | 57°F | 28% | 15% | 13 h 50 min |
| August 23 | 78°F | 56°F | 28% | 15% | 13 h 50 min |
| August 24 | 78°F | 56°F | 28% | 15% | 13 h 40 min |
| August 25 | 78°F | 56°F | 28% | 15% | 13 h 40 min |
| August 26 | 78°F | 56°F | 28% | 15% | 13 h 40 min |
| August 27 | 78°F | 55°F | 28% | 15% | 13 h 30 min |
| August 28 | 78°F | 55°F | 28% | 15% | 13 h 30 min |
| August 29 | 77°F | 55°F | 28% | 15% | 13 h 30 min |
| August 30 | 77°F | 55°F | 28% | 15% | 13 h 20 min |
| August 31 | 77°F | 54°F | 28% | 15% | 13 h 20 min |
- Normal high
- 80°FAugust average
- Normal low
- 58°FAugust average
- Precipitation
- 2.89 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 3
- Daylight
- 14 h 40 min to 13 h 20 minAugust 1 to August 31
- Days at 70°F or more
- 29
- Days at 80°F or more
- 16
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014946; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Watertown in August?
On a given August day the chance of 0.01 inch or more is 28% on average, highest around August 1 (29%). In all, 2.89 in falls on 9 days of a normal August, 1 of them with an inch or more.
In a normal August in Watertown, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014946.
How humid and windy is Watertown in August?
At 3 p.m. the normal temperature is 77°F with 51% relative humidity and a dew point of 57°F; at 6 a.m. it is 58°F with 89% humidity. The wind averages 9.5 mph, most often from the south in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 58°F | 55°F | 89% | 7.5 mph | 73% |
| 9 a.m. | 66°F | 58°F | 74% | 10.5 mph | 75% |
| noon | 74°F | 58°F | 57% | 12.3 mph | 73% |
| 3 p.m. | 77°F | 57°F | 51% | 12.7 mph | 76% |
| 6 p.m. | 73°F | 58°F | 58% | 10.6 mph | 80% |
| 9 p.m. | 65°F | 58°F | 77% | 7.8 mph | 83% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014946. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for August in Watertown?
The warmest August temperature on this station's record (since 1893) is 105°F, on August 4, 1934; the coldest is 32°F, on August 28, 1965. The wettest August brought 7.67 in (1900).
The August mean against the 1991-2020 normal of 68.5°F: 2021 70.6°F (+2.1), 2022 70.0°F (+1.5), 2023 71.6°F (+3.1), 2024 68.3°F (−0.2), 2025 69.2°F (+0.7), 2026 69.9°F (+1.4). 5 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 70.6°F | +2.1°F | 4.77 in |
| 2022 | 70.0°F | +1.5°F | 3.21 in |
| 2023 | 71.6°F | +3.1°F | 3.59 in |
| 2024 | 68.3°F | −0.2°F | 2.66 in |
| 2025 | 69.2°F | +0.7°F | 5.29 in |
| 2026 | 69.9°F | +1.4°F | 0.20 in |
Source: records: ACIS, station USW00014946; recent months: ACIS, station USW00014946. Records and recent months use complete months only.
How does August in Watertown compare across South Dakota?
Across the 100 places PlainClimate covers in South Dakota, August normal highs run from 78°F in Astoria to 91°F in Interior; Watertown's is 80°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.