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 Lewistown Weather Forecast Summary |
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Today
Jul 18th
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Sunday
Jul 19th
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Monday
Jul 20th
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Tuesday
Jul 21st
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Wednesday
Jul 22nd
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Mostly Sunny |
Mostly Sunny |
Sunny |
Mostly Sunny |
Mostly Sunny |
90°F
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91°F
68°F |
80°F
63°F |
82°F
58°F |
87°F
68°F |
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| Lewistown Detailed Weather Forecast |
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| Sunday, July 19th, 2026 |
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Overnight |
Temperature: 69°F |
| Clear with cloudy periods with a chance of showers. Windy at times. |
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Morning |
Temperature: 74°F |
| Sunny. |
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Afternoon |
Temperature: 88°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 82°F |
| Clear with cloudy periods. Windy at times. |
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| Monday, July 20th, 2026 |
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Overnight |
Temperature: 67°F |
| Clear. |
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Morning |
Temperature: 67°F |
| Sunny. |
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Afternoon |
Temperature: 78°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 73°F |
| Clear. Windy at times. |
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| Tuesday, July 21st, 2026 |
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Overnight |
Temperature: 62°F |
| Clear. |
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Morning |
Temperature: 63°F |
| Sunny. |
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Afternoon |
Temperature: 80°F |
| Sunny with cloudy periods. Windy at times. |
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Evening |
Temperature: 77°F |
| Mostly clear. |
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| Wednesday, July 22nd, 2026 |
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Overnight |
Temperature: 69°F |
| Mostly clear. |
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Morning |
Temperature: 72°F |
| Sunny with cloudy periods. |
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Afternoon |
Temperature: 85°F |
| Mostly sunny. Windy at times. |
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Evening |
Temperature: 81°F |
| A mix of clear and cloudy skies. Windy at times. |
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| Thursday, July 23rd, 2026 |
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Overnight |
Temperature: 71°F |
| A mix of cloudy and clear skies. |
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Morning |
Temperature: 70°F |
| A mix of cloud and sun. |
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Afternoon |
Temperature: 73°F |
| A mix of cloud and sun. Windy at times. |
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Evening |
Temperature: 73°F |
| Clear. Slight chance of a thunderstorm. Windy at times. |
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| Friday, July 24th, 2026 |
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Overnight |
Temperature: 68°F |
| Clear. Slight chance of a thunderstorm. |
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Morning |
Temperature: 78°F |
| Sunny. Chance of a thunderstorm. |
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Afternoon |
Temperature: 96°F |
| Sunny. Chance of a thunderstorm. Windy. |
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Evening |
Temperature: 77°F |
| Mostly clear. Slight chance of a thunderstorm. Windy at times. |
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| Saturday, July 25th, 2026 |
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Overnight |
Temperature: 72°F |
| Clear. Windy at times. |
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Morning |
Temperature: 73°F |
| Sunny. |
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Afternoon |
Temperature: 91°F |
| Sunny. Windy. |
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Evening |
Temperature: 79°F |
| Mostly clear. Windy. |
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| Sunday, July 26th, 2026 |
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Overnight |
Temperature: 64°F |
| Clear. Windy at times. |
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Morning |
Temperature: 68°F |
| Sunny. |
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Afternoon |
Temperature: 84°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 79°F |
| Clear. Windy. |
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