Roselle weather
Best months for weather: May–Sep. Below: today's sky, the hour-by-hour rain chance and the 16-day forecast for Roselle, Illinois, United States.
Best Time to Visit
Peak season May–SepOff season Nov–Mar
Roselle weather by month
When is the best time to visit Roselle?
Based on weather alone, the best time to visit Roselle is May–Sep, according to NASA's 2001–2025 climate averages. Nov–Mar tends to be the least pleasant. Average highs run from -1°C (29°F) in January to 29°C (84°F) in July.
What is the rainiest month in Roselle?
May is the wettest month, with about 120 mm (4.7 in) of rain on average. January is the driest, with about 44 mm (1.7 in).
What is the hottest month in Roselle?
July is the warmest, with average highs of 29°C (84°F) and lows of 18°C (64°F). January is the coolest, with highs of -1°C (29°F) and lows of -10°C (14°F).
Does Roselle have a rainy season?
Not a strong one. No month averages more than 150 mm of rain; the wettest is May at about 120 mm (4.7 in).
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), forecast and current conditions from Open-Meteo. Page updated . How we rate months