Green Bay weather in August: Green Bay, Wisconsin: normal highs, lows, rain and records for August
Green Bay in August has a normal high of 79°F and a normal low of 58°F, a daily mean of 69°F, falling from 81°F on the 1st to 77°F by the 31st. Measurable precipitation falls on 10 days in a normal August, 3.39 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 15°C, 86 mm of precipitation in August.
- NOAA stationGreen Bay A S International Airport
- Station IDUSW00014898
- Location44.50°N 88.11°W
- Elevation682 ft (208 m)
- From the center6 miles
- Population106,311
- Jan 26° 11°
- Feb 29° 13°
- Mar 40° 24°
- Apr 54° 35°
- May 67° 46°
- Jun 77° 56°
- Jul 81° 60°
- Aug 79° 58°
- Sep 72° 50°
- Oct 58° 40°
- Nov 44° 29°
- Dec 31° 18°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Green Bay in August?
The normal high is 79°F and the normal low 58°F, for a daily mean of 68.6°F. August is 1.9°F cooler than July and 7.6°F warmer than September. August is the 2nd warmest month of the year in Green Bay and the 3rd wettest. Across the month the normal high falls 4°F, from 81°F on August 1 to 77°F on August 31. From one year to the next August's mean temperature typically moves about 2.3°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 34%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 81°F | 60°F | 34% | 21% |
| August 8 | 80°F | 59°F | 33% | 21% |
| August 15 | 79°F | 59°F | 32% | 21% |
| August 22 | 78°F | 58°F | 32% | 20% |
| August 31 | 77°F | 55°F | 31% | 20% |
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 | 81°F | 60°F | 34% | 21% | 14 h 40 min |
| August 2 | 81°F | 60°F | 34% | 21% | 14 h 40 min |
| August 3 | 80°F | 60°F | 34% | 21% | 14 h 40 min |
| August 4 | 80°F | 60°F | 34% | 21% | 14 h 30 min |
| August 5 | 80°F | 60°F | 34% | 21% | 14 h 30 min |
| August 6 | 80°F | 60°F | 34% | 21% | 14 h 30 min |
| August 7 | 80°F | 60°F | 34% | 21% | 14 h 30 min |
| August 8 | 80°F | 59°F | 33% | 21% | 14 h 20 min |
| August 9 | 80°F | 59°F | 33% | 21% | 14 h 20 min |
| August 10 | 80°F | 59°F | 33% | 21% | 14 h 20 min |
| August 11 | 80°F | 59°F | 33% | 21% | 14 h 20 min |
| August 12 | 80°F | 59°F | 33% | 21% | 14 h 10 min |
| August 13 | 79°F | 59°F | 33% | 21% | 14 h 10 min |
| August 14 | 79°F | 59°F | 32% | 21% | 14 h 10 min |
| August 15 | 79°F | 59°F | 32% | 21% | 14 h 10 min |
| August 16 | 79°F | 59°F | 32% | 21% | 14 h |
| August 17 | 79°F | 58°F | 32% | 21% | 14 h |
| August 18 | 79°F | 58°F | 32% | 21% | 14 h |
| August 19 | 79°F | 58°F | 32% | 21% | 14 h |
| August 20 | 79°F | 58°F | 32% | 20% | 13 h 50 min |
| August 21 | 78°F | 58°F | 32% | 20% | 13 h 50 min |
| August 22 | 78°F | 58°F | 32% | 20% | 13 h 50 min |
| August 23 | 78°F | 57°F | 32% | 20% | 13 h 40 min |
| August 24 | 78°F | 57°F | 31% | 20% | 13 h 40 min |
| August 25 | 78°F | 57°F | 31% | 20% | 13 h 40 min |
| August 26 | 78°F | 57°F | 31% | 20% | 13 h 40 min |
| August 27 | 77°F | 56°F | 31% | 20% | 13 h 30 min |
| August 28 | 77°F | 56°F | 31% | 20% | 13 h 30 min |
| August 29 | 77°F | 56°F | 31% | 20% | 13 h 30 min |
| August 30 | 77°F | 56°F | 31% | 20% | 13 h 20 min |
| August 31 | 77°F | 55°F | 31% | 20% | 13 h 20 min |
- Normal high
- 79°FAugust average
- Normal low
- 58°FAugust average
- Precipitation
- 3.39 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 1
- 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
- 15
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014898; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Green Bay in August?
On a given August day the chance of 0.01 inch or more is 32% on average, highest around August 1 (34%). In all, 3.39 in falls on 10 days of a normal August, 1 of them with an inch or more.
In a normal August in Green Bay, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014898.
How humid and windy is Green Bay in August?
At 3 p.m. the normal temperature is 76°F with 57% relative humidity and a dew point of 59°F; at 6 a.m. it is 59°F with 92% humidity. The wind averages 6.6 mph, most often from the southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 59°F | 57°F | 92% | 4.7 mph | 61% |
| 9 a.m. | 69°F | 60°F | 73% | 7.9 mph | 62% |
| noon | 75°F | 60°F | 60% | 9.4 mph | 55% |
| 3 p.m. | 76°F | 59°F | 57% | 9.4 mph | 59% |
| 6 p.m. | 71°F | 60°F | 69% | 6.9 mph | 70% |
| 9 p.m. | 63°F | 59°F | 84% | 5.3 mph | 71% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014898. 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 Green Bay?
The warmest August temperature on Green Bay's official record (since 1886) is 100°F, on August 24, 1948; the coldest is 38°F, on August 30, 1915. The wettest August brought 9.04 in (1975).
The August mean against the 1991-2020 normal of 68.6°F: 2021 71.1°F (+2.5), 2022 70.5°F (+1.9), 2023 68.7°F (+0.1), 2024 69.9°F (+1.3), 2025 66.9°F (−1.7), 2026 68.8°F (+0.2). 5 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 71.1°F | +2.5°F | 8.30 in |
| 2022 | 70.5°F | +1.9°F | 4.44 in |
| 2023 | 68.7°F | +0.1°F | 3.20 in |
| 2024 | 69.9°F | +1.3°F | 5.67 in |
| 2025 | 66.9°F | −1.7°F | 1.85 in |
| 2026 | 68.8°F | +0.2°F | 1.62 in |
Source: records: ACIS, NWS threaded record GRBthr; recent months: ACIS, station USW00014898. Records and recent months use complete months only.
How does August in Green Bay compare across Wisconsin?
Across the 165 places PlainClimate covers in Wisconsin, August normal highs run from 71°F in Laona to 83°F in Lake Geneva; Green Bay's is 79°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.