Best Time to Visit Grayslake: Month-by-Month Guide
Best months for Grayslake: September, July, August, June.
- Best months for Grayslake: September, July, August, June.
- Peak season is July, August, June. Expect higher prices and more visitors (estimated from the climate, not from visitor counts).
- Shoulder season: September. Good weather without the busiest period.
- Wettest months: May, April, June.
- The least pleasant month is January (score 3.9).
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -1°C | -7°C | 58 mm | 9 | – | – | 3.9 |
| February | 1°C | -6°C | 52 mm | 7 | – | – | 4.2 |
| March | 6°C | -1°C | 65 mm | 9 | – | – | 5.1 |
| April | 12°C | 4°C | 111 mm | 12 | – | – | 5.8 |
| May | 19°C | 11°C | 106 mm | 12 | – | – | 6.8 |
| June | 25°C | 17°C | 91 mm | 12 | – | – | 7.5 |
| July | 28°C | 20°C | 83 mm | 11 | – | – | 7.6 |
| August | 27°C | 19°C | 92 mm | 11 | – | – | 7.6 |
| September | 23°C | 15°C | 75 mm | 9 | – | – | 7.9 |
| October | 16°C | 8°C | 83 mm | 9 | – | – | 6.9 |
| November | 8°C | 2°C | 66 mm | 8 | – | – | 5.8 |
| December | 2°C | -4°C | 61 mm | 9 | – | – | 4.3 |
Frequently asked questions
When is the best time to visit Grayslake?
The best months are September, July, August, June.
When is the rainy season in Grayslake?
The wettest months are May, April, June.