Grand Detour, IL weather
Today, hourly and 7-day forecast, sunrise and sunset, and the normal climate month by month
Weather in Grand Detour now
Loading the National Weather Service forecast…
Grand Detour weather by the hour
Grand Detour weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Grand Detour.
This week in Grand Detour
Sunrise, sunset and moon in Grand Detour
What is the weather usually like in Grand Detour?
Köppen climate classification, calculated from the 1991–2020 normals
- Julywarmest month · 83°F average high
- Januarycoldest month · 14°F average low
- 40.5 inprecipitation per year · 1,029 mm
- 31.2 insnowfall per year · 79 cm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Grand Detour: June to September, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station DIXON 1W, IL US (USC00112348), adjusted for the elevation of Grand Detour.
Grand Detour weather month by month
Sunrise and sunset in Grand Detour through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:21 AM | 4:53 PM | 9 h 32 min |
| February | 6:51 AM | 5:32 PM | 10 h 40 min |
| March | 7:07 AM | 7:05 PM | 11 h 58 min |
| April | 6:15 AM | 7:39 PM | 13 h 24 min |
| May | 5:35 AM | 8:12 PM | 14 h 37 min |
| June | 5:20 AM | 8:36 PM | 15 h 16 min |
| July | 5:34 AM | 8:32 PM | 14 h 58 min |
| August | 6:04 AM | 7:59 PM | 13 h 54 min |
| September | 6:36 AM | 7:08 PM | 12 h 32 min |
| October | 7:08 AM | 6:17 PM | 11 h 8 min |
| November | 6:46 AM | 4:38 PM | 9 h 52 min |
| December | 7:16 AM | 4:28 PM | 9 h 12 min |
Times for the 15th of each month, local time (America/Chicago).
What is the weather like in Grand Detour?
Grand Detour has a hot-summer humid continental climate. The warmest month is July, with an average high of 83°F (28°C), and the coldest is January, with average lows of 14°F (-10°C).
It gets about 40.5 inches (1,029 mm) of precipitation a year. The wettest month is June and the driest is February. Snow is common: about 31 inches fall in an average year.
The best time to visit Grand Detour is June to September. At 656 ft of elevation, nights are mild most of the year. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
More about Grand Detour
Weather in towns near Grand Detour
Questions about the weather in Grand Detour
What is the hottest month in Grand Detour?
July, with an average high of 83°F (28°C).
What is the coldest month in Grand Detour?
January, with an average low of 14°F (-10°C).
How much does it rain in Grand Detour?
About 40.5 inches (1,029 mm) a year; the wettest month is June.
Does it snow in Grand Detour?
Yes, about 31 inches of snow fall in an average year.
When is the best time to visit Grand Detour?
June to September, when temperatures are most pleasant and rainy days are fewer.
What climate does Grand Detour have?
Hot-summer humid continental (Köppen Dfa).
What is the weather like in Grand Detour in November?
Highs average 48°F and lows 31°F, with about 2.4 inches of precipitation.
What time is sunrise in Grand Detour?
Around 6:46 AM in mid-November, and sunset around 4:38 PM. Today’s exact times are shown above.
Where does this Grand Detour weather forecast come from?
From the National Weather Service (NOAA), the official U.S. weather agency, for the exact coordinates of Grand Detour.
Last updated: