Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 19°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Wednesday
17th Jun
19

8

10

9
Thursday
18th Jun
19

6

11

8
Friday
19th Jun
23

6

7

7
Saturday
20th Jun
25

10

3

8
Sunday
21st Jun
21

10

13

6

5-day weather forecast updated at 04:03 on Wednesday 17th June 2026 GMT

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The 5-day weather forecast for Montana (Lewistown) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Lewistown weather forecast by day

Below are the detailed weather forecasts for Lewistown for the next 5 days.

Lewistown weather for Wednesday 17th June 2026

Expect sunshine and showers in Lewistown, Montana with a maximum temperature of 19°C, maximum UV of 9 (Very High) and 10 hours of bright sunshine. There are 2-5 mm of rainfall expected with 13% chance of some rain and a fresh breeze of 31 kph from the north-west.

19
°C maximum temperature
8
°C minimum temperature
sunshine and showers
10
hours of sunshine
9
UV index (Very High)
13
% chance of some rain
<5
mm of rainfall expected
19
°C wind chill
31
kph wind from NW

Lewistown weather for Thursday 18th June 2026

Expect sunshine and showers in Lewistown, Montana with a maximum temperature of 19°C, maximum UV of 8 (Very High) and 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 56% chance of some rain and a gentle breeze of 15 kph from the north-west.

19
°C maximum temperature
6
°C minimum temperature
sunshine and showers
11
hours of sunshine
8
UV index (Very High)
56
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
15
kph wind from NW

Lewistown weather for Friday 19th June 2026

Expect broken clouds in Lewistown, Montana with a maximum temperature of 23°C, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 22 kph from the east.

23
°C maximum temperature
6
°C minimum temperature
broken clouds
7
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
23
°C wind chill
22
kph wind from E

Lewistown weather for Saturday 20th June 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 25°C, maximum UV of 8 (Very High) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 41% chance of some rain and a gentle breeze of 17 kph from the south-east.

25
°C maximum temperature
10
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
8
UV index (Very High)
41
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
17
kph wind from SE

Lewistown weather for Sunday 21st June 2026

Expect sunshine and showers in Lewistown, Montana with a maximum temperature of 21°C, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a gentle breeze of 18 kph from the north-west.