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 Lewistown Weather Forecast Summary |
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Today
May 14th
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Friday
May 15th
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Saturday
May 16th
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Sunday
May 17th
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Monday
May 18th
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Mostly Sunny |
Sunny |
Mix of Cloud and Sun |
Mostly Cloudy |
Mix of Sun and Cloud |
60°F
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58°F
47°F |
61°F
40°F |
44°F
34°F |
55°F
29°F |
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| Lewistown Detailed Weather Forecast |
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| Thursday, May 14th, 2026 |
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Overnight |
Temperature: 48°F |
| Clear. Wind 25 to 40 mph. |
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Morning |
Temperature: 50°F |
| Sunny with cloudy periods. Wind 25 to 40 mph. |
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Afternoon |
Temperature: 59°F |
| Mostly sunny. Wind 25 to 40 mph. |
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Evening |
Temperature: 55°F |
| Clear. Wind 20 to 30 mph. |
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| Friday, May 15th, 2026 |
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Overnight |
Temperature: 49°F |
| Clear. Wind 20 to 30 mph. |
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Morning |
Temperature: 50°F |
| Sunny. Wind 20 to 30 mph. |
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Afternoon |
Temperature: 57°F |
| A mix of sun and cloud. Wind 25 to 40 mph. |
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Evening |
Temperature: 52°F |
| Clear. Wind 20 to 30 mph. |
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| Saturday, May 16th, 2026 |
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Overnight |
Temperature: 41°F |
| Mostly clear. |
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Morning |
Temperature: 46°F |
| Sunny with cloudy periods. |
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Afternoon |
Temperature: 60°F |
| Mostly cloudy. Windy. |
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Evening |
Temperature: 43°F |
| Cloudy with a chance of showers. Windy at times. |
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| Sunday, May 17th, 2026 |
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Overnight |
Temperature: 39°F |
| Mostly cloudy with a chance of showers. Showers possibly mixed with wet flurries. Windy at times. |
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Morning |
Temperature: 36°F |
| Mostly cloudy with a slight chance of showers. Showers possibly mixed with wet flurries. Windy. |
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Afternoon |
Temperature: 42°F |
| Cloudy with sunny periods with a slight chance of showers. Windy. |
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Evening |
Temperature: 38°F |
| A mix of clear and cloudy skies. Windy. |
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| Monday, May 18th, 2026 |
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Overnight |
Temperature: 30°F |
| Clear. Windy at times. |
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Morning |
Temperature: 35°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 52°F |
| A mix of cloud and sun. Windy at times. |
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Evening |
Temperature: 50°F |
| A mix of cloudy and clear skies with a slight chance of showers. |
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| Tuesday, May 19th, 2026 |
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Overnight |
Temperature: 40°F |
| Clear with cloudy periods with a slight chance of showers. |
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Morning |
Temperature: 46°F |
| Mostly cloudy. |
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Afternoon |
Temperature: 53°F |
| Cloudy with a chance of showers. |
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Evening |
Temperature: 50°F |
| Mostly clear with a chance of showers. |
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| Wednesday, May 20th, 2026 |
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Overnight |
Temperature: 42°F |
| Clear. Windy at times. |
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Morning |
Temperature: 45°F |
| A mix of sun and cloud. |
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Afternoon |
Temperature: 54°F |
| Cloudy with a chance of showers. Slight chance of a thunderstorm. |
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Evening |
Temperature: 50°F |
| Mostly cloudy with a chance of showers. |
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| Thursday, May 21st, 2026 |
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Overnight |
Temperature: 44°F |
| Mostly cloudy with a slight chance of showers. |
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Morning |
Temperature: 46°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 57°F |
| A mix of cloud and sun with a chance of showers. Windy at times. |
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Evening |
Temperature: 53°F |
| Mostly clear with a slight chance of showers. |
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| Friday, May 22nd, 2026 |
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Overnight |
Temperature: 45°F |
| Clear. |
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Morning |
Temperature: 52°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 74°F |
| Mostly sunny. Windy at times. |
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Evening |
Temperature: 69°F |
| Clear. Slight chance of a thunderstorm. Windy at times. |
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