| 日期 | 天气 | 高/低 | 降水 |
|---|---|---|---|
| 2026-09-01 | 阵雨 | 22°/15° | 4.6 mm |
| 2026-09-02 | 晴间多云 | 24°/14° | 0.0 mm |
| 2026-09-03 | 小毛毛雨 | 25°/13° | 0.1 mm |
| 2026-09-04 | 阴 | 22°/13° | 0.0 mm |
| 2026-09-05 | 阴 | 21°/11° | 0.0 mm |
| 2026-09-06 | 阴 | 20°/10° | 0.0 mm |
| 2026-09-07 | 阴 | 24°/10° | 0.0 mm |
| 2026-09-08 | 毛毛雨 | 22°/12° | 1.9 mm |
| 2026-09-09 | 毛毛雨 | 18°/8° | 1.2 mm |
| 2026-09-10 | 阴 | 20°/7° | 0.0 mm |
| 2026-09-11 | 阴 | 21°/7° | 0.0 mm |
| 2026-09-12 | 阴 | 24°/9° | 0.0 mm |
| 2026-09-13 | 阴 | 21°/12° | 0.0 mm |
| 2026-09-14 | 阴 | 21°/10° | 0.0 mm |
| 2026-09-15 | 晴天 | 20°/8° | 0.0 mm |
| 2026-09-16 | 晴天 | 23°/8° | 0.0 mm |
| 2026-09-17 | 阴 | 22°/9° | 0.0 mm |
| 2026-09-18 | 阴 | 20°/10° | 0.0 mm |
| 2026-09-19 | 阴 | 20°/10° | 0.0 mm |
| 2026-09-20 | 阴 | 22°/9° | 0.0 mm |
| 2026-09-21 | 阴 | 24°/11° | 0.0 mm |
| 2026-09-22 | 晴天 | 23°/11° | 0.0 mm |
| 2026-09-23 | 小毛毛雨 | 22°/11° | 0.2 mm |
| 2026-09-24 | 阴 | 20°/11° | 0.0 mm |
| 2026-09-25 | 毛毛雨 | 14°/11° | 2.8 mm |
| 2026-09-26 | 阴 | 21°/10° | 0.0 mm |
| 2026-09-27 | 强阵雨 | 18°/10° | 18.7 mm |
| 2026-09-28 | 小毛毛雨 | 18°/8° | 0.5 mm |
| 2026-09-29 | 阴 | 20°/8° | 0.0 mm |
| 2026-09-30 | 中阵雨 | 14°/7° | 6.3 mm |
2026年09月孟山共记录 30 天，平均最高 20℃、最低 10℃，降水日 9 天。