| 日期 | 天气 | 高/低 | 降水 |
|---|---|---|---|
| 2026-09-01 | 小毛毛雨 | 22°/12° | 1.2 mm |
| 2026-09-02 | 小毛毛雨 | 15°/12° | 2.9 mm |
| 2026-09-03 | 雷阵雨 | 21°/15° | 8.3 mm |
| 2026-09-04 | 阵雨 | 19°/9° | 3.3 mm |
| 2026-09-05 | 阴 | 21°/8° | 0.0 mm |
| 2026-09-06 | 晴天 | 25°/11° | 0.0 mm |
| 2026-09-07 | 阴 | 21°/11° | 0.0 mm |
| 2026-09-08 | 毛毛雨 | 21°/14° | 1.5 mm |
| 2026-09-09 | 小毛毛雨 | 18°/9° | 1.2 mm |
| 2026-09-10 | 阴 | 20°/8° | 0.0 mm |
| 2026-09-11 | 阴 | 21°/11° | 0.0 mm |
| 2026-09-12 | 小毛毛雨 | 22°/11° | 0.5 mm |
| 2026-09-13 | 阴 | 24°/13° | 0.0 mm |
| 2026-09-14 | 大毛毛雨 | 21°/12° | 2.7 mm |
| 2026-09-15 | 阴 | 18°/10° | 0.0 mm |
| 2026-09-16 | 阴 | 20°/9° | 0.0 mm |
| 2026-09-17 | 阴 | 24°/10° | 0.0 mm |
| 2026-09-18 | 晴天 | 24°/11° | 0.0 mm |
| 2026-09-19 | 阴 | 24°/10° | 0.0 mm |
| 2026-09-20 | 小毛毛雨 | 21°/14° | 0.6 mm |
| 2026-09-21 | 阴 | 24°/13° | 0.0 mm |
| 2026-09-22 | 阴 | 21°/10° | 0.0 mm |
| 2026-09-23 | 阴 | 19°/9° | 0.0 mm |
| 2026-09-24 | 阵雨 | 15°/7° | 8.0 mm |
| 2026-09-25 | 阴 | 16°/5° | 0.0 mm |
| 2026-09-26 | 阴 | 18°/7° | 0.0 mm |
| 2026-09-27 | 大毛毛雨 | 18°/10° | 6.0 mm |
| 2026-09-28 | 阵雨 | 22°/13° | 6.2 mm |
| 2026-09-29 | 阵雨 | 14°/11° | 9.1 mm |
| 2026-09-30 | 小毛毛雨 | 18°/10° | 0.3 mm |
2026年09月留萌郡共记录 30 天，平均最高 20℃、最低 10℃，降水日 14 天。