| Permits cannot be obtained over the phone. There is a non-refundable fee of $10.00 per permit. Also there is a $5.00 fee per person per night camped below the rim. There is a $5.00 fee for groups that camp above the rim. You may also obtain a one-year frequent hiker permit that costs $25.00 and waives the $10.00 per permit fee. If you plan on exploring caves you will also need a permit. It's Hot Inside the Grand Canyon Both Spring and Fall are the best times to hike in the Grand Canyon. We were in the Canyon late April and early May and the weather was perfect. Temperatures(F) and Rainfall(inches) at Phantom Ranch | | J | F | M | A | M | J | J | A | S | O | N | D | | Maximum | 72 | 82 | 88 | 98 | 109 | 114 | 119 | 120 | 108 | 102 | 84 | 70 | | Ave. Max. | 56 | 62 | 71 | 82 | 92 | 101 | 106 | 103 | 97 | 84 | 68 | 57 | | Minimum | 36 | 42 | 48 | 56 | 63 | 72 | 78 | 75 | 96 | 58 | 46 | 37 | | Ave. Min | 26 | 31 | 32 | 27 | 46 | 61 | 62 | 59 | 49 | 41 | 31 | 30 | | Ave. Rainfall | 0.7 | 0.8 | 0.8 | 0.5 | 0.4 | 0.3 | 0.8 | 1.4 | 1.0 | 0.7 | 0.4 | 0.9 | |