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Round Lake Beach Weather by Month
Average temperatures, rainfall and humidity for Round Lake Beach, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Round Lake Beach month looks like before you travel — then check the live Round Lake Beach forecast for the days ahead.
Warmest month
July
28°C average high
Coolest month
January
-8°C average low
Wettest month
June
114 mm of rain
Driest month
February
27 mm of rain
Average temperature and rainfall in Round Lake Beach by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 0°C | -8°C | -31°C / 16°C | 34 mm | 78% | 15 km/h |
| February | 2°C | -7°C | -27°C / 23°C | 27 mm | 73% | 16 km/h |
| March | 9°C | -1°C | -22°C / 27°C | 63 mm | 70% | 17 km/h |
| April | 15°C | 5°C | -8°C / 30°C | 81 mm | 66% | 17 km/h |
| May | 22°C | 11°C | -2°C / 35°C | 87 mm | 66% | 14 km/h |
| June | 27°C | 16°C | 3°C / 36°C | 114 mm | 69% | 13 km/h |
| July | 28°C | 18°C | 11°C / 35°C | 92 mm | 74% | 11 km/h |
| August | 27°C | 18°C | 9°C / 37°C | 70 mm | 75% | 11 km/h |
| September | 25°C | 15°C | 2°C / 34°C | 72 mm | 74% | 11 km/h |
| October | 17°C | 8°C | -4°C / 31°C | 84 mm | 73% | 14 km/h |
| November | 9°C | 1°C | -18°C / 24°C | 43 mm | 73% | 15 km/h |
| December | 3°C | -4°C | -23°C / 20°C | 41 mm | 79% | 15 km/h |
Best time to visit Round Lake Beach
The most comfortable time to visit Round Lake Beach is generally May and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 808 mm a year.
Travellers who prefer heat should aim for July, when highs average 28°C. June is the month to avoid if rain would spoil your plans — it averages 114 mm, roughly 4× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Round Lake Beach forecast for what is happening now.