| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -13.3° | -22.1° | 18.6mm | 11.7 | 7 |
| February | -9.8° | -20.3° | 14.4mm | 10 | 10 |
| March | -1.5° | -11.9° | 18.9mm | 9 | 12 |
| April | 9.3° | -1.4° | 21.5mm | 8.3 | 44 |
| May | 18.7° | 5.8° | 40.4mm | 11.2 | 73 |
| June | 23.1° | 11.4° | 61.5mm | 12.1 | 76 |
| July | 24.4° | 13.1° | 73.4mm | 12.2 | 76 |
| August | 22.1° | 11° | 58.2mm | 12.2 | 76 |
| September | 15.8° | 5.4° | 42.2mm | 12 | 63 |
| October | 7.5° | -0.6° | 32mm | 12.1 | 32 |
| November | -3.2° | -10° | 29.5mm | 12.4 | 5 |
| December | -9.9° | -18.2° | 24.9mm | 13.3 | 3 |
January in Ishim averages a daily high of -13.3°C with nights around -22.1°C. Expect roughly 11.7 wet days totalling 18.6mm. A hard month to visit for comfort alone.
February in Ishim averages a daily high of -9.8°C with nights around -20.3°C. Expect roughly 10 wet days totalling 14.4mm. A hard month to visit for comfort alone.
March in Ishim averages a daily high of -1.5°C with nights around -11.9°C. Expect roughly 9 wet days totalling 18.9mm. A hard month to visit for comfort alone.
April in Ishim averages a daily high of 9.3°C with nights around -1.4°C. Expect roughly 8.3 wet days totalling 21.5mm. Demanding conditions — pack for it and plan indoor options.
May in Ishim averages a daily high of 18.7°C with nights around 5.8°C. Expect roughly 11.2 wet days totalling 40.4mm. Generally workable, with some weather to plan around.
June in Ishim averages a daily high of 23.1°C with nights around 11.4°C. Expect roughly 12.1 wet days totalling 61.5mm. Comfortable conditions for being outdoors all day.
July in Ishim averages a daily high of 24.4°C with nights around 13.1°C. Expect roughly 12.2 wet days totalling 73.4mm. Comfortable conditions for being outdoors all day.
August in Ishim averages a daily high of 22.1°C with nights around 11°C. Expect roughly 12.2 wet days totalling 58.2mm. Comfortable conditions for being outdoors all day.
September in Ishim averages a daily high of 15.8°C with nights around 5.4°C. Expect roughly 12 wet days totalling 42.2mm. Generally workable, with some weather to plan around.
October in Ishim averages a daily high of 7.5°C with nights around -0.6°C. Expect roughly 12.1 wet days totalling 32mm. A hard month to visit for comfort alone.
November in Ishim averages a daily high of -3.2°C with nights around -10°C. Expect roughly 12.4 wet days totalling 29.5mm. A hard month to visit for comfort alone.
December in Ishim averages a daily high of -9.9°C with nights around -18.2°C. Expect roughly 13.3 wet days totalling 24.9mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Ishim peaks at 76.
Based on 30 years of records, May–August scores highest for comfort in Ishim, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 24.4°C.
July is the wettest, averaging 73.4mm of rain across roughly 12.2 wet days.
January is the coolest month, with average daily highs around -13.3°C.