June to August for maximum experience; mid-May to early June or mid-September to mid-October for best balance of good weather and smaller crowds. Summer offers warm temperatures (~80°F highs in July), all attractions operating, and the full Maid of the Mist season. Shoulder seasons (late spring, early fall) provide pleasant weather with 30–40% lower hotel rates and significantly fewer crowds. September is often cited as ideal — warm days, thinner crowds, fall foliage beginning. Winter closes some attractions but offers uniquely beautiful ice-covered scenery
| Month | High (°F) | Low (°F) | Notes |
|---|---|---|---|
| Jan | 32 | 21 | cold & changeable |
| Feb | 33 | 20 | crisp & changeable |
| Mar | 42 | 27 | crisp & changeable |
| Apr | 54 | 37 | cool & changeable |
| May | 67 | 50 | mild & changeable |
| Jun | 75 | 60 | warm & changeable |
| Jul | 80 | 66 | warm & changeable |
| Aug | 78 | 65 | warm & changeable |
| Sep | 72 | 59 | warm & changeable |
| Oct | 60 | 48 | cool & changeable |
| Nov | 48 | 36 | cool & changeable |
| Dec | 38 | 28 | crisp & changeable |