The best time to visit Mongolia is May–Sep. Month by month, the verdicts rate Jun–Aug as comfortable on both daytime heat and rainfall — 3 months in all.
Arid; cold winters
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | -15.3 | 4 | 2% | Too cold |
| February | -10.7 | 13 | 2% | Too cold |
| March | -2.6 | 27 | 5% | Too cold |
| April | 6.8 | 44 | 9% | Fair |
| May | 14.7 | 58 | 18% | Fair |
| June | 21.4 | 71 | 32% | Go |
| July | 23.7 | 75 | 43% | Go |
| August | 21.2 | 70 | 37% | Go |
| September | 14.5 | 58 | 20% | Fair |
| October | 4.6 | 40 | 9% | Too cold |
| November | -6.1 | 21 | 6% | Too cold |
| December | -13.6 | 8 | 3% | Too cold |
Verdict combines mean daytime high with rainy-day frequency. “Rainy days” is the share of days in the month with at least 1 mm of rain.
January is the driest month, with rain on 2% of days and daytime highs near -15.3°C (4°F). July is the wettest, at 43%. Temperature swings hard across the year — 39.0°C between July (23.7°C / 75°F) and January (-15.3°C / 4°F) — so packing for the wrong month is the main risk. The record rules out too cold in Oct–Mar.