Moline weather in August: Moline, Illinois: normal highs, lows, rain and records for August
Moline in August has a normal high of 84°F and a normal low of 63°F, a daily mean of 73°F, falling from 85°F on the 1st to 82°F by the 31st. Measurable precipitation falls on 9 days in a normal August, 3.97 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 17°C, 101 mm of precipitation in August.
- NOAA stationMoline Quad City International Airport
- Station IDUSW00014923
- Location41.47°N 90.52°W
- Elevation592 ft (180 m)
- From the center2 miles
- Population42,442
- Jan 32° 15°
- Feb 37° 19°
- Mar 50° 30°
- Apr 63° 40°
- May 74° 51°
- Jun 83° 61°
- Jul 86° 65°
- Aug 84° 63°
- Sep 78° 54°
- Oct 65° 43°
- Nov 50° 31°
- Dec 37° 21°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Moline in August?
The normal high is 84°F and the normal low 63°F, for a daily mean of 73.4°F. August is 2.1°F cooler than July and 7.3°F warmer than September. August is the 2nd warmest month of the year in Moline and the 4th wettest. Across the month the normal high falls 3°F, from 85°F on August 1 to 82°F on August 31. From one year to the next August's mean temperature typically moves about 2.6°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 71°F and 76°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 30%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 85°F | 65°F | 30% | 19% |
| August 8 | 85°F | 64°F | 30% | 19% |
| August 15 | 84°F | 63°F | 30% | 19% |
| August 22 | 84°F | 62°F | 30% | 19% |
| August 31 | 82°F | 60°F | 29% | 19% |
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 | 85°F | 65°F | 30% | 19% | 14 h 30 min |
| August 2 | 85°F | 64°F | 30% | 19% | 14 h 20 min |
| August 3 | 85°F | 64°F | 30% | 19% | 14 h 20 min |
| August 4 | 85°F | 64°F | 30% | 19% | 14 h 20 min |
| August 5 | 85°F | 64°F | 30% | 19% | 14 h 20 min |
| August 6 | 85°F | 64°F | 30% | 19% | 14 h 10 min |
| August 7 | 85°F | 64°F | 30% | 19% | 14 h 10 min |
| August 8 | 85°F | 64°F | 30% | 19% | 14 h 10 min |
| August 9 | 85°F | 64°F | 30% | 19% | 14 h 10 min |
| August 10 | 85°F | 64°F | 30% | 19% | 14 h 10 min |
| August 11 | 85°F | 64°F | 30% | 19% | 14 h |
| August 12 | 85°F | 64°F | 30% | 19% | 14 h |
| August 13 | 85°F | 63°F | 30% | 19% | 14 h |
| August 14 | 84°F | 63°F | 30% | 19% | 14 h |
| August 15 | 84°F | 63°F | 30% | 19% | 13 h 50 min |
| August 16 | 84°F | 63°F | 30% | 19% | 13 h 50 min |
| August 17 | 84°F | 63°F | 30% | 19% | 13 h 50 min |
| August 18 | 84°F | 63°F | 30% | 19% | 13 h 50 min |
| August 19 | 84°F | 63°F | 30% | 19% | 13 h 40 min |
| August 20 | 84°F | 62°F | 30% | 19% | 13 h 40 min |
| August 21 | 84°F | 62°F | 30% | 19% | 13 h 40 min |
| August 22 | 84°F | 62°F | 30% | 19% | 13 h 40 min |
| August 23 | 84°F | 62°F | 30% | 19% | 13 h 30 min |
| August 24 | 83°F | 62°F | 30% | 19% | 13 h 30 min |
| August 25 | 83°F | 61°F | 30% | 19% | 13 h 30 min |
| August 26 | 83°F | 61°F | 29% | 19% | 13 h 30 min |
| August 27 | 83°F | 61°F | 29% | 19% | 13 h 20 min |
| August 28 | 83°F | 61°F | 29% | 19% | 13 h 20 min |
| August 29 | 83°F | 60°F | 29% | 19% | 13 h 20 min |
| August 30 | 83°F | 60°F | 29% | 19% | 13 h 20 min |
| August 31 | 82°F | 60°F | 29% | 19% | 13 h 10 min |
- Normal high
- 84°FAugust average
- Normal low
- 63°FAugust average
- Precipitation
- 3.97 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 5
- Daylight
- 14 h 30 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 24
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014923; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Moline in August?
On a given August day the chance of 0.01 inch or more is 30% on average, highest around August 7 (30%). In all, 3.97 in falls on 9 days of a normal August, 1 of them with an inch or more.
In a normal August in Moline, 5 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014923.
How humid and windy is Moline in August?
At 3 p.m. the normal temperature is 81°F with 52% relative humidity and a dew point of 62°F; at 6 a.m. it is 63°F with 89% humidity. The wind averages 6.0 mph, most often from the south-southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 63°F | 60°F | 89% | 4.1 mph | 66% |
| 9 a.m. | 73°F | 63°F | 70% | 7.1 mph | 74% |
| noon | 79°F | 62°F | 56% | 8.6 mph | 63% |
| 3 p.m. | 81°F | 62°F | 52% | 8.8 mph | 69% |
| 6 p.m. | 77°F | 63°F | 63% | 6.1 mph | 70% |
| 9 p.m. | 69°F | 63°F | 80% | 4.7 mph | 80% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014923. 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 Moline?
The warmest August temperature on Moline's official record (since 1874) is 106°F, on August 18, 1936; the coldest is 40°F, on August 30, 1915. The wettest August brought 15.23 in (1987).
The August mean against the 1991-2020 normal of 73.4°F: 2021 75.9°F (+2.5), 2022 73.4°F (at normal), 2023 72.5°F (−0.9), 2024 73.2°F (−0.2), 2025 72.2°F (−1.2), 2026 73.5°F (at normal). 1 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 75.9°F | +2.5°F | 3.96 in |
| 2022 | 73.4°F | at normal | 4.21 in |
| 2023 | 72.5°F | −0.9°F | 2.35 in |
| 2024 | 73.2°F | −0.2°F | 4.26 in |
| 2025 | 72.2°F | −1.2°F | 1.75 in |
| 2026 | 73.5°F | at normal | 4.84 in |
Source: records: ACIS, NWS threaded record MLIthr; recent months: ACIS, station USW00014923. Records and recent months use complete months only.
How does August in Moline compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, August normal highs run from 79°F in Barrington to 89°F in Anna; Moline's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.