The most pleasant months of the year for Rock Island are September, June and August. In Rock Island, there are 5 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Rock Island with an average high temperature of 84.7°, which ranks it as cooler than most places in Illinois. January is the snowiest month in Rock Island with 8.5 inches of snow, and 6 months of the year have significant snowfall. July is the most humid month, though humidity is low for most of the year.
Today's Weather - Rock Island, IL
3 AM PST
Scattered Snow Showers
26°F
| 7 DAY FORECAST | DESCRIPTION | HIGH/LOW | WIND |
|---|
| Overnight | Scattered Snow Showers | 22° / 28° | W 5 mph |
| Monday Night | Mostly Cloudy | 16° / 28° | W 5 mph |
| Tuesday Night | Slight Chance Light Snow then Partly Cloudy | 15° / 38° | W 0 to 10 mph |
| Wednesday Night | Partly Cloudy | 29° / 36° | SW 5 to 15 mph |
| Thursday Night | Mostly Clear | 15° / 21° | NW 10 mph |
| Friday Night | Partly Cloudy | 9° / 24° | NW 5 mph |
| Saturday Night | Slight Chance Light Snow | 19° / 32° | E 5 mph |
Weather Highlights
Summer High: the July high is around 85 degrees
Winter Low: the January low is 15
Rain: averages 37 inches of rain a year
Snow: averages 28 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for the Rock Island area is 6.9 (10=best), which means it is more comfortable than most places in Illinois.
6.9 / 10
A higher score indicates a more comfortable year-round climate. The US average for the comfort index is 7. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.
Average Monthly High and Low (°F)
| High | Low |
| January | 31° | 15° |
| February | 36° | 19° |
| March | 49° | 30° |
| April | 62° | 41° |
| May | 73° | 51° |
| June | 82° | 61° |
| July | 85° | 65° |
| August | 83° | 63° |
| September | 76° | 54° |
| October | 64° | 43° |
| November | 49° | 31° |
| December | 34° | 19° |
Hot, Freezing, Rainy, Snowy Days: Rock Island
| Hot
Days | Freezing
Days | Rainy
Days | Snowy
Days |
| January | 0 | 29 | 9 | 5 |
| February | 0 | 25 | 8 | 4 |
| March | 0 | 19 | 10 | 2 |
| April | 0 | 5 | 11 | 1 |
| May | 1 | 0 | 12 | 0 |
| June | 3 | 0 | 11 | 0 |
| July | 6 | 0 | 9 | 0 |
| August | 4 | 0 | 10 | 0 |
| September | 1 | 0 | 8 | 0 |
| October | 0 | 4 | 9 | 0 |
| November | 0 | 16 | 10 | 1 |
| December | 0 | 27 | 10 | 5 |
YOU SHOULD KNOW
Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.
Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.
Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.