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 Lewistown Weather Forecast Summary |
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Today
Jul 28th
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Wednesday
Jul 29th
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Thursday
Jul 30th
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Friday
Jul 31st
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Saturday
Aug 1st
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Mostly Sunny |
Mostly Sunny |
Mostly Sunny |
Mostly Sunny |
Mostly Sunny |
94°F
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91°F
67°F |
93°F
67°F |
94°F
67°F |
102°F
73°F |
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| Lewistown Detailed Weather Forecast |
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| Tuesday, July 28th, 2026 |
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Overnight |
Temperature: 68°F |
| Clear. |
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Morning |
Temperature: 70°F |
| Sunny with cloudy periods. |
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Afternoon |
Temperature: 90°F |
| Sunny. Slight chance of a thunderstorm. Windy at times. |
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Evening |
Temperature: 87°F |
| Clear with cloudy periods. Slight chance of a thunderstorm. Windy at times. |
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| Wednesday, July 29th, 2026 |
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Overnight |
Temperature: 72°F |
| Clear. |
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Morning |
Temperature: 73°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 89°F |
| Sunny with cloudy periods. Windy at times. |
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Evening |
Temperature: 81°F |
| Clear with cloudy periods with a slight chance of showers. Windy at times. |
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| Thursday, July 30th, 2026 |
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Overnight |
Temperature: 71°F |
| Clear. Slight chance of a thunderstorm. |
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Morning |
Temperature: 74°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 90°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 84°F |
| Mostly clear. Windy at times. |
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| Friday, July 31st, 2026 |
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Overnight |
Temperature: 68°F |
| Mostly clear. |
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Morning |
Temperature: 74°F |
| Mostly sunny. |
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Afternoon |
Temperature: 93°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 86°F |
| Clear. Windy at times. |
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| Saturday, August 1st, 2026 |
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Overnight |
Temperature: 73°F |
| Clear. |
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Morning |
Temperature: 81°F |
| Sunny. |
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Afternoon |
Temperature: 100°F |
| Sunny. Windy. |
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Evening |
Temperature: 93°F |
| Mostly clear. Windy at times. |
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| Sunday, August 2nd, 2026 |
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Overnight |
Temperature: 77°F |
| Mostly clear. |
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Morning |
Temperature: 79°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 96°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 85°F |
| Mostly clear. Windy. |
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| Monday, August 3rd, 2026 |
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Overnight |
Temperature: 67°F |
| Clear. Windy at times. |
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Morning |
Temperature: 66°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 77°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 72°F |
| Clear. Windy at times. |
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| Tuesday, August 4th, 2026 |
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Overnight |
Temperature: 56°F |
| Mostly clear. |
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Morning |
Temperature: 53°F |
| Cloudy with a chance of showers. Windy at times. |
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Afternoon |
Temperature: 61°F |
| A mix of cloud and sun with a chance of showers. |
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Evening |
Temperature: 62°F |
| Clear with cloudy periods. Windy at times. |
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