Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 18°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Monday
7th Sep
18

10

4

3
Tuesday
8th Sep
16

8

4

2
Wednesday
9th Sep
23

8

13

6
Thursday
10th Sep
26

9

13

6
Friday
11th Sep
21

11

9

5

5-day weather forecast updated at 04:03 on Sunday 6th September 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 Monday 7th September 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 18°C, maximum UV of 3 (Moderate) and 4 hours of bright sunshine. There are 10-20 mm of rainfall expected with 82% chance of some rain and a fresh breeze of 33 kph from the west.

18
°C maximum temperature
10
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
3
UV index (Moderate)
82
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
33
kph wind from W

Lewistown weather for Tuesday 8th September 2026

Expect mostly cloudy with light rain in Lewistown, Montana with a maximum temperature of 16°C, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a fresh breeze of 37 kph from the west.

16
°C maximum temperature
8
°C minimum temperature
mostly cloudy with light rain
4
hours of sunshine
2
UV index (Low)
25
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
37
kph wind from W

Lewistown weather for Wednesday 9th September 2026

Expect clear skies in Lewistown, Montana with a maximum temperature of 23°C, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the north-west.

23
°C maximum temperature
8
°C minimum temperature
clear skies
13
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
15
kph wind from NW

Lewistown weather for Thursday 10th September 2026

Expect clear skies in Lewistown, Montana with a maximum temperature of 26°C, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 22 kph from the west.

26
°C maximum temperature
9
°C minimum temperature
clear skies
13
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
26
°C wind chill
22
kph wind from W

Lewistown weather for Friday 11th September 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 21°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the north-west.