| 日期 | 天气 | 高/低 | 降水 |
|---|---|---|---|
| 2026-09-01 | 小毛毛雨 | 25°/19° | 0.5 mm |
| 2026-09-02 | 雷阵雨 | 29°/19° | 5.7 mm |
| 2026-09-03 | 中阵雨 | 25°/18° | 23.6 mm |
| 2026-09-04 | 雷阵雨 | 23°/17° | 12.1 mm |
| 2026-09-05 | 小雨 | 24°/17° | 5.1 mm |
| 2026-09-06 | 中雨 | 17°/15° | 26.5 mm |
| 2026-09-07 | 强阵雨 | 23°/17° | 65.8 mm |
| 2026-09-08 | 中阵雨 | 28°/20° | 11.6 mm |
| 2026-09-09 | 强阵雨 | 23°/16° | 27.5 mm |
| 2026-09-10 | 小雨 | 16°/15° | 5.3 mm |
| 2026-09-11 | 中阵雨 | 20°/15° | 10.6 mm |
| 2026-09-12 | 小毛毛雨 | 20°/17° | 0.2 mm |
| 2026-09-13 | 小毛毛雨 | 25°/18° | 1.6 mm |
| 2026-09-14 | 毛毛雨 | 30°/17° | 3.7 mm |
| 2026-09-15 | 中阵雨 | 22°/17° | 17.7 mm |
| 2026-09-16 | 中阵雨 | 19°/16° | 24.7 mm |
| 2026-09-17 | 阵雨 | 20°/16° | 4.2 mm |
| 2026-09-18 | 小毛毛雨 | 20°/13° | 0.1 mm |
| 2026-09-19 | 阴 | 22°/14° | 0.0 mm |
| 2026-09-20 | 阵雨 | 20°/17° | 11.3 mm |
| 2026-09-21 | 中阵雨 | 20°/18° | 25.9 mm |
| 2026-09-22 | 雾 | 23°/14° | 0.0 mm |
| 2026-09-23 | 小毛毛雨 | 19°/14° | 0.1 mm |
| 2026-09-24 | 小毛毛雨 | 25°/15° | 0.2 mm |
| 2026-09-25 | 毛毛雨 | 21°/15° | 2.0 mm |
| 2026-09-26 | 小雨 | 15°/14° | 9.7 mm |
| 2026-09-27 | 阵雨 | 22°/14° | 5.2 mm |
| 2026-09-28 | 中阵雨 | 24°/16° | 17.3 mm |
| 2026-09-29 | 中阵雨 | 17°/13° | 23.5 mm |
| 2026-09-30 | 阴 | 19°/11° | 0.0 mm |
2026年09月佐久市共记录 30 天，平均最高 21℃、最低 15℃，降水日 27 天。