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 Lewistown Weather Forecast Summary |
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Today
Jul 12th
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Monday
Jul 13th
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Tuesday
Jul 14th
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Wednesday
Jul 15th
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Thursday
Jul 16th
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Mostly Sunny |
Mostly Sunny |
Mostly Sunny |
Mix of Sun and Cloud |
Mostly Sunny |
104°F
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93°F
68°F |
87°F
69°F |
82°F
64°F |
89°F
66°F |
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| Lewistown Detailed Weather Forecast |
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| Sunday, July 12th, 2026 |
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Evening |
Temperature: 90°F |
| A mix of clear and cloudy skies. Slight chance of a thunderstorm. Windy. |
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| Monday, July 13th, 2026 |
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Overnight |
Temperature: 72°F |
| Mostly clear. |
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Morning |
Temperature: 75°F |
| Mostly sunny. |
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Afternoon |
Temperature: 91°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 86°F |
| Clear. Windy at times. |
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| Tuesday, July 14th, 2026 |
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Overnight |
Temperature: 72°F |
| Clear with cloudy periods. |
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Morning |
Temperature: 74°F |
| Sunny with cloudy periods. |
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Afternoon |
Temperature: 85°F |
| Sunny with cloudy periods. Windy at times. |
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Evening |
Temperature: 82°F |
| Mostly clear. Slight chance of a thunderstorm. Windy at times. |
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| Wednesday, July 15th, 2026 |
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Overnight |
Temperature: 66°F |
| A mix of cloudy and clear skies with a chance of showers. |
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Morning |
Temperature: 67°F |
| Mostly sunny with a chance of showers. |
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Afternoon |
Temperature: 81°F |
| A mix of cloud and sun. Chance of a thunderstorm. Windy at times. |
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Evening |
Temperature: 75°F |
| A mix of cloudy and clear skies with a chance of showers or thundershowers. |
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| Thursday, July 16th, 2026 |
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Overnight |
Temperature: 67°F |
| Clear with cloudy periods with a chance of showers. Slight chance of a thunderstorm. |
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Morning |
Temperature: 71°F |
| Mostly sunny. Slight chance of a thunderstorm. |
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Afternoon |
Temperature: 86°F |
| Mostly sunny. Slight chance of a thunderstorm. Windy at times. |
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Evening |
Temperature: 83°F |
| Clear. Slight chance of a thunderstorm. Windy at times. |
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| Friday, July 17th, 2026 |
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Overnight |
Temperature: 71°F |
| Mostly clear. |
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Morning |
Temperature: 76°F |
| Sunny. Slight chance of a thunderstorm. Windy at times. |
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Afternoon |
Temperature: 91°F |
| Mostly sunny. Slight chance of a thunderstorm. Windy at times. |
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Evening |
Temperature: 86°F |
| Mostly clear. Windy at times. |
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| Saturday, July 18th, 2026 |
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Overnight |
Temperature: 74°F |
| Mostly clear. |
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Morning |
Temperature: 78°F |
| Mostly sunny. |
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Afternoon |
Temperature: 93°F |
| Mostly sunny. Chance of a thunderstorm. Windy at times. |
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Evening |
Temperature: 80°F |
| A mix of clear and cloudy skies with a chance of showers or thundershowers. Windy at times. |
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| Sunday, July 19th, 2026 |
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Overnight |
Temperature: 72°F |
| A mix of clear and cloudy skies with a chance of showers. Slight chance of a thunderstorm. |
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Morning |
Temperature: 76°F |
| Mostly sunny. Slight chance of a thunderstorm. |
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Afternoon |
Temperature: 93°F |
| Sunny with cloudy periods. Chance of a thunderstorm. Windy at times. |
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Evening |
Temperature: 81°F |
| A mix of clear and cloudy skies. Slight chance of a thunderstorm. Windy at times. |
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| Monday, July 20th, 2026 |
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Overnight |
Temperature: 72°F |
| Mostly clear. |
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Morning |
Temperature: 78°F |
| Sunny. |
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Afternoon |
Temperature: 94°F |
| Sunny with cloudy periods. |
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Evening |
Temperature: 86°F |
| A mix of cloudy and clear skies. Windy at times. |
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