Taiwan has no ideal window. No month clears the bar for comfortable travel outright, but Oct–Feb comes closest — rated fair rather than too hot, too cold or too wet.
Rainy Jun–Jul, typhoons Aug–Sep
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 19.4 | 67 | 53% | Fair |
| February | 20.3 | 69 | 57% | Fair |
| March | 22.7 | 73 | 60% | Too wet |
| April | 26.4 | 80 | 62% | Too wet |
| May | 29.7 | 85 | 68% | Too wet |
| June | 32.7 | 91 | 73% | Too wet |
| July | 34.8 | 95 | 62% | Too hot |
| August | 34.2 | 94 | 72% | Too hot |
| September | 31.5 | 89 | 64% | Too wet |
| October | 27.6 | 82 | 47% | Fair |
| November | 24.8 | 77 | 57% | Fair |
| December | 21.0 | 70 | 51% | Fair |
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.
October is the driest month, with rain on 47% of days and daytime highs near 27.6°C (82°F). June is the wettest, at 73%. The warmest month is July at 34.8°C (95°F); the coolest is January at 19.4°C (67°F). The record rules out too wet in Mar–Jun, September; too hot in Jul–Aug.