Rockford, IL weather in August
In August, Rockford sees highs around 82°F and lows around 62°F: warm and often humid, with some rain. Rain falls on about 9 days. It is one of the warmest months in Rockford. Good for outdoor plans.
- Normal high
- 82°F
- Normal low
- 62°F
- Wet days
- 9
- 4.2 in total
- Muggy days
- 10
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 83°F | 80°F |
| Normal low | 63°F | 59°F |
| Chance of a wet day | 30% | 29% |
| Sunrise / sunset | 5:49 am / 8:16 pm | 6:20 am / 7:32 pm |
| Daylight | 14.4 h | 13.2 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical August day
- 6 am64°Fdew point 60°F
- 9 am73°Fdew point 62°F
- Noon79°Fdew point 62°F
- 3 pm80°Fdew point 62°F
- 6 pm77°Fdew point 62°F
- 9 pm69°Fdew point 63°F
NOAA hourly normals (local standard time) from Rockford Gtr Rockford Airport (5 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F8 of 31
- Hot dayshigh 90°F or more3 of 31
- Muggy daysdaily mean dew point 65°F or more10 of 31
- Wet daysat least 0.01 in of rain or melted snow9 of 31
- Notable rainat least 0.10 in6 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 4.2 in; a dry August brings about 2.8 in and a wet one about 5.3 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202003: average high 86°F
- Coolest August2004: average high 76°F
- Wettest August2007: 14.0 in
- Driest August2003: 0.5 in
- Highest reading99°F (August 2, 1991)
- Lowest reading44°F (August 16, 1992)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 84°F | 82°F | 75°F |
| Normal low | 64°F | 62°F | 54°F |
| Wet days | 9 | 9 | 8 |
| Comfortable days | 6 | 8 | 14 |
| Daylight | 14.9 h | 13.8 h | 12.5 h |
Highs change by -2°F from July and -7°F into September.
Nearby alternatives in August
- Cooler: Sister Bay, WI224 mi · high 75°F · 9 wet days
How Rockford ranks in August
- Normal high272nd warmest of 378 cities; 7th of 8 in Illinois
- Wet days204th driest of 378
- Comfortable days95th most of 341
What to pack for Rockford in August
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
August has 8 heating degree days and 222 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Rockford in August?
The normal high is 82°F and the normal low is 62°F. From 1991 to 2020 the hottest August reading was 99°F (August 2, 1991).
Does it rain a lot in Rockford in August?
About 9 days in August have at least 0.01 in of precipitation, and the normal total is 4.2 in. The wettest August in 1991-2020 was in 2007 (14.0 in); the driest was in 2003 (0.5 in).
Is August a good time to visit Rockford?
August ranks 5th of 12 months on our comfort score for Rockford (60 out of 100). It has about 8 comfortable days and about 3 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates and humidity and wind by hour: Rockford Gtr Rockford Airport (USW00094822), 5.4 mi S of the city center, 730 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Greater Rockford Airport (725430-94822), 5.4 mi S of the city center, 725 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).