Ottawa, IL weather
Today, hourly and 7-day forecast, sunrise and sunset, and the normal climate month by month
Weather in Ottawa now
Loading the National Weather Service forecast…
Ottawa weather by the hour
Ottawa weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Ottawa.
This week in Ottawa
Sunrise, sunset and moon in Ottawa
What is the weather usually like in Ottawa?
Köppen climate classification, calculated from the 1991–2020 normals
- Julywarmest month · 84°F average high
- Januarycoldest month · 14°F average low
- 39.0 inprecipitation per year · 992 mm
- 25.0 insnowfall per year · 64 cm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Ottawa: June to September, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station MARSEILLES LOCK, IL US (USC00115372), adjusted for the elevation of Ottawa.
Ottawa weather month by month
Sunrise and sunset in Ottawa through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:17 AM | 4:52 PM | 9 h 35 min |
| February | 6:48 AM | 5:30 PM | 10 h 42 min |
| March | 7:05 AM | 7:03 PM | 11 h 58 min |
| April | 6:13 AM | 7:36 PM | 13 h 23 min |
| May | 5:34 AM | 8:08 PM | 14 h 34 min |
| June | 5:19 AM | 8:32 PM | 15 h 12 min |
| July | 5:33 AM | 8:28 PM | 14 h 55 min |
| August | 6:03 AM | 7:56 PM | 13 h 52 min |
| September | 6:34 AM | 7:06 PM | 12 h 31 min |
| October | 7:06 AM | 6:15 PM | 11 h 9 min |
| November | 6:42 AM | 4:37 PM | 9 h 54 min |
| December | 7:12 AM | 4:28 PM | 9 h 15 min |
Times for the 15th of each month, local time (America/Chicago).
What is the weather like in Ottawa?
Ottawa has a hot-summer humid continental climate. The warmest month is July, with an average high of 84°F (29°C), and the coldest is January, with average lows of 14°F (-10°C).
It gets about 39.0 inches (992 mm) of precipitation a year. The wettest month is June and the driest is February. Snow is common: about 25 inches fall in an average year.
The best time to visit Ottawa is June to September. At 482 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 Ottawa
Weather in towns near Ottawa
Questions about the weather in Ottawa
What is the hottest month in Ottawa?
July, with an average high of 84°F (29°C).
What is the coldest month in Ottawa?
January, with an average low of 14°F (-10°C).
How much does it rain in Ottawa?
About 39.0 inches (992 mm) a year; the wettest month is June.
Does it snow in Ottawa?
Yes, about 25 inches of snow fall in an average year.
When is the best time to visit Ottawa?
June to September, when temperatures are most pleasant and rainy days are fewer.
What climate does Ottawa have?
Hot-summer humid continental (Köppen Dfa).
What is the weather like in Ottawa in November?
Highs average 49°F and lows 30°F, with about 2.7 inches of precipitation.
What time is sunrise in Ottawa?
Around 6:42 AM in mid-November, and sunset around 4:37 PM. Today’s exact times are shown above.
Where does this Ottawa weather forecast come from?
From the National Weather Service (NOAA), the official U.S. weather agency, for the exact coordinates of Ottawa.
Last updated: