Missoula weather in August

In August, Missoula sees average daytime highs of 82°F and overnight lows near 52°F, with 0.8 in of rain across 3.9 wet days and about 14 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 84°F in the first days to 78°F by the end. The sky is clear or mostly clear about 55% of the time in August, and the air most often feels dry.

Daylight stretches from about 14 h 42 min at the start of August to 13 h 12 min by month's end. Set against the rest of the year, August is Missoula's 2nd-clearest and 8th-windiest month. For the whole year in context, see Missoula's year-round climate.

Daytime high: 82°; 2nd warmest
Overnight low: 52°; 11th coldest
Rainfall: 0.8 in; 3.9 wet days
Daylight: 14 hours; 5:39 AM – 7:41 PM
Cloud cover: 38%; 2nd clearest
Wind: 4 mph; 8th windiest
Solar energy: 6.41 kWh/m²
Travel score: 7.3; out of 10

Missoula is county seat of Missoula County, Montana, United States.

Density: 933/km²; people per km²
Founded: 1866

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← July Missoula year-round climate September →Best places to visit in August

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 84°F in the first days to 78°F by the end.

A typical August day in Missoula reaches about 82°F in the afternoon and slips back to 52°F overnight — a 30°F spread between the day's warmth and the night's chill. On most days the high lands between 70°F and 91°F. Set against its neighbours, August runs on par with July and about 11°F warmer than September.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°F)	85	85	85	84	84	84	84	84	83	83	83	83	83	83	82	82	82	82	81	81	81	80	80	80	80	79	79	78	78	78	77
Avg low (°F)	54	54	54	54	54	54	54	53	53	53	53	53	53	53	52	52	52	52	51	51	51	51	51	50	50	50	50	49	49	49	48

	Avg high (°F)	Avg low (°F)
1	85	54
2	85	54
3	85	54
4	84	54
5	84	54
6	84	54
7	84	54
8	84	53
9	83	53
10	83	53
11	83	53
12	83	53
13	83	53
14	83	53
15	82	52
16	82	52
17	82	52
18	82	52
19	81	51
20	81	51
21	81	51
22	80	51
23	80	51
24	80	50
25	80	50
26	79	50
27	79	50
28	78	49
29	78	49
30	78	49
31	77	48

How August really feels in Missoula

Once humidity and wind are folded in, August averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F

heat index over the day's high

Days feeling ≤ 32°F

wind chill below the day's low

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Missoula weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	32° / 17°	1.8	10.8	11.1	8.8	0.0
Feb	36° / 19°	1.6	9.9	9.3	10	0.0
Mar	44° / 25°	1.7	11	7.3	11.6	0.8
Apr	53° / 31°	2.1	11.4	4.3	13.3	2.8
May	62° / 39°	2.2	11.1	0.7	14.8	5.2
Jun	71° / 46°	2.2	10	0.3	15.6	6.5
Jul	82° / 53°	0.7	4.6	0	15.3	7.1
Aug	82° / 52°	0.8	3.9	0	14	7.3
Sep	70° / 44°	1.2	5.8	0.1	12.4	7.4
Oct	55° / 33°	1.7	8.6	2.1	10.6	3.7
Nov	40° / 24°	2.0	10	7.8	9.2	0.3
Dec	31° / 16°	2.0	10.4	10.6	8.4	0.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 26%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	80	78	78	77	76	76	76	75	74	74	74	74	74	73	73	74	74	74	74	74	75	75	74	74	74	74	73	73	72	71	71
Cloudier (%)	20	22	22	23	24	24	24	25	26	26	26	26	26	27	27	26	26	26	26	26	25	25	26	26	26	26	27	27	28	29	29

	Clearer (%)	Cloudier (%)
1	80	20
2	78	22
3	78	22
4	77	23
5	76	24
6	76	24
7	76	24
8	75	25
9	74	26
10	74	26
11	74	26
12	74	26
13	74	26
14	73	27
15	73	27
16	74	26
17	74	26
18	74	26
19	74	26
20	74	26
21	75	25
22	75	25
23	74	26
24	74	26
25	74	26
26	74	26
27	73	27
28	73	27
29	72	28
30	71	29
31	71	29

Chance of precipitation in August

Any precipitation

Missoula gets around 0.8 in of rain over 3.9 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 12% and peaks near 15% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	9	10	10	10	11	11	11	11	12	12	12	12	13	13	13	13	13	13	13	13	13	13	13	13	14	14	14	14	14	14	15

	Rain chance (%)
1	9
2	10
3	10
4	10
5	11
6	11
7	11
8	11
9	12
10	12
11	12
12	12
13	13
14	13
15	13
16	13
17	13
18	13
19	13
20	13
21	13
22	13
23	13
24	13
25	14
26	14
27	14
28	14
29	14
30	14
31	15

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

Wind in August

Winds average 4 mph in August.

Across August, daily wind ranges from about 3 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (mph)	4	4	4	4	4	4	4	4	3	3	3	3	3	3	3	3	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (mph)	Feels
1	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	3	calm
10	3	calm
11	3	calm
12	3	calm
13	3	calm
14	3	calm
15	3	calm
16	3	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	calm
31	4	calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 42 min at the start of August to 13 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over August. Sunrise moves from 5:20 AM to 5:59 AM, and sunset from 8:04 PM to 7:13 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	14.7	14.7	14.7	14.6	14.6	14.5	14.5	14.4	14.4	14.3	14.3	14.2	14.2	14.1	14.1	14.0	14.0	13.9	13.9	13.8	13.8	13.7	13.7	13.6	13.6	13.5	13.5	13.4	13.3	13.3	13.2
Sunrise (AM)	5:20	5:21	5:22	5:23	5:25	5:26	5:27	5:29	5:30	5:31	5:32	5:34	5:35	5:36	5:38	5:39	5:40	5:42	5:43	5:44	5:46	5:47	5:48	5:50	5:51	5:52	5:54	5:55	5:56	5:58	5:59
Sunset (PM)	8:04	8:03	8:02	8:00	7:59	7:57	7:56	7:54	7:53	7:51	7:50	7:48	7:46	7:45	7:43	7:41	7:39	7:38	7:36	7:34	7:32	7:30	7:29	7:27	7:25	7:23	7:21	7:19	7:17	7:15	7:13

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	14.7	5:20	8:04
2	14.7	5:21	8:03
3	14.7	5:22	8:02
4	14.6	5:23	8:00
5	14.6	5:25	7:59
6	14.5	5:26	7:57
7	14.5	5:27	7:56
8	14.4	5:29	7:54
9	14.4	5:30	7:53
10	14.3	5:31	7:51
11	14.3	5:32	7:50
12	14.2	5:34	7:48
13	14.2	5:35	7:46
14	14.1	5:36	7:45
15	14.1	5:38	7:43
16	14.0	5:39	7:41
17	14.0	5:40	7:39
18	13.9	5:42	7:38
19	13.9	5:43	7:36
20	13.8	5:44	7:34
21	13.8	5:46	7:32
22	13.7	5:47	7:30
23	13.7	5:48	7:29
24	13.6	5:50	7:27
25	13.6	5:51	7:25
26	13.5	5:52	7:23
27	13.5	5:54	7:21
28	13.4	5:55	7:19
29	13.3	5:56	7:17
30	13.3	5:58	7:15
31	13.2	5:59	7:13

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.41 kWh/m².

For context, solar energy here swings from a low near 1.37 kWh/m² to a high of 7.45 kWh/m² in July across the year — August's 6.41 kWh/m² sits near the top of that range.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	7.1	7.0	7.0	7.0	6.9	6.9	6.8	6.8	6.7	6.7	6.6	6.6	6.5	6.5	6.5	6.4	6.4	6.3	6.3	6.2	6.2	6.1	6.1	6.0	6.0	5.9	5.9	5.8	5.8	5.7	5.7
Level	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	7.1	Intense
2	7.0	Intense
3	7.0	Intense
4	7.0	Intense
5	6.9	Intense
6	6.9	Intense
7	6.8	Intense
8	6.8	Intense
9	6.7	Intense
10	6.7	Intense
11	6.6	Intense
12	6.6	Intense
13	6.5	Intense
14	6.5	Intense
15	6.5	Intense
16	6.4	Intense
17	6.4	Intense
18	6.3	Intense
19	6.3	Intense
20	6.2	Intense
21	6.2	Intense
22	6.1	Intense
23	6.1	Intense
24	6.0	Intense
25	6.0	Bright
26	5.9	Bright
27	5.9	Bright
28	5.8	Bright
29	5.8	Bright
30	5.7	Bright
31	5.7	Bright

Planning a trip in August

Is August a good time to visit Missoula?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

7.3

Sightseeing

2nd-best month of the year

8.0

Beach & pool

1st-best month of the year

August is one of the better times to visit Missoula for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Missoula in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Missoula sees daytime highs around 82°F and nights near 52°F. Pack light clothes and sun protection. About 4 days see rain.

light clothessun protection

UV index in Missoula in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Missoula peaks around July 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	2	4	5	7	7	9	6	5	4	1	1
Level	Low	Low	Moderate	Moderate	High	Very high	Very high	High	Moderate	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	2	Low
Mar	4	Moderate
Apr	5	Moderate
May	7	High
Jun	7	Very high
Jul	9	Very high
Aug	6	High
Sep	5	Moderate
Oct	4	Moderate
Nov	1	Low
Dec	1	Low

Air quality in Missoula in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Missoula is worst in September — around 54 µg/m³ PM2.5 (poor), about 10.7× the cleanest month (January, 5 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	5	5	8	10	10	8	35	51	54	10	6	5
Level	Good	Good	Good	Good	Good	Good	Poor	Poor	Poor	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	5	Good
Feb	5	Good
Mar	8	Good
Apr	10	Good
May	10	Good
Jun	8	Good
Jul	35	Poor
Aug	51	Poor
Sep	54	Poor
Oct	10	Good
Nov	6	Good
Dec	5	Good

Location & terrain

Where is Missoula?

Missoula sits at 46.9°N, 114.0°W, 3,209 ft above sea level, in United States. The nearest listed city is Butte, 92 mi away.

Topography around Missoula

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Missoula.

Within 2 miles, the terrain around Missoula has significant variations in elevation — a maximum elevation change of 1,952 ft around an average of 3,406 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 4,833 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,139 ft.

The land around Missoula is covered by artificial surfaces (36%), grassland (35%) and trees (25%) within 2 miles, trees (58%) and grassland (33%) within 10 miles, and trees (69%) and grassland (26%) within 50 miles.

2 miles

1,952 ft

artificial surfaces 36%

10 miles

4,833 ft

trees 58%

50 miles

7,139 ft

trees 69%

treesgrasslandcroplandartificial surfacesbare terrainwatermoss and lichen

← July Missoula year-round climate September →Best places to visit in August

August weather nearby: Butte 92 mi · Kalispell 93 mi · Helena 94 mi · Whitefish 107 mi · Great Falls 134 mi · Coeur d'Alene 142 mi · Moscow 142 mi · Lewiston Orchards 145 mi

United States travel facts

Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 100% of US; price level, 2025
GDP per capita: $90,027; 2025
Happiness: 6.8 / 10; World Happiness, 2025
Safe drinking water: 98%; of population, 2024
Homicide rate: 5.8; per 100k, 2023
Road deaths: 12.7; per 100k/yr, 2019
Income group: High; World Bank
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Missoula (46.8721°, -113.994°, elevation 3,209 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°F)	Avg low (°F)
1	85	54
2	85	54
3	85	54
4	84	54
5	84	54
6	84	54
7	84	54
8	84	53
9	83	53
10	83	53
11	83	53
12	83	53
13	83	53
14	83	53
15	82	52
16	82	52
17	82	52
18	82	52
19	81	51
20	81	51
21	81	51
22	80	51
23	80	51
24	80	50
25	80	50
26	79	50
27	79	50
28	78	49
29	78	49
30	78	49
31	77	48

	Clearer (%)	Cloudier (%)
1	80	20
2	78	22
3	78	22
4	77	23
5	76	24
6	76	24
7	76	24
8	75	25
9	74	26
10	74	26
11	74	26
12	74	26
13	74	26
14	73	27
15	73	27
16	74	26
17	74	26
18	74	26
19	74	26
20	74	26
21	75	25
22	75	25
23	74	26
24	74	26
25	74	26
26	74	26
27	73	27
28	73	27
29	72	28
30	71	29
31	71	29

	Rain chance (%)
1	9
2	10
3	10
4	10
5	11
6	11
7	11
8	11
9	12
10	12
11	12
12	12
13	13
14	13
15	13
16	13
17	13
18	13
19	13
20	13
21	13
22	13
23	13
24	13
25	14
26	14
27	14
28	14
29	14
30	14
31	15

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°F)	Avg low (°F)
1	85	54
2	85	54
3	85	54
4	84	54
5	84	54
6	84	54
7	84	54
8	84	53
9	83	53
10	83	53
11	83	53
12	83	53
13	83	53
14	83	53
15	82	52
16	82	52
17	82	52
18	82	52
19	81	51
20	81	51
21	81	51
22	80	51
23	80	51
24	80	50
25	80	50
26	79	50
27	79	50
28	78	49
29	78	49
30	78	49
31	77	48

	Clearer (%)	Cloudier (%)
1	80	20
2	78	22
3	78	22
4	77	23
5	76	24
6	76	24
7	76	24
8	75	25
9	74	26
10	74	26
11	74	26
12	74	26
13	74	26
14	73	27
15	73	27
16	74	26
17	74	26
18	74	26
19	74	26
20	74	26
21	75	25
22	75	25
23	74	26
24	74	26
25	74	26
26	74	26
27	73	27
28	73	27
29	72	28
30	71	29
31	71	29

	Rain chance (%)
1	9
2	10
3	10
4	10
5	11
6	11
7	11
8	11
9	12
10	12
11	12
12	12
13	13
14	13
15	13
16	13
17	13
18	13
19	13
20	13
21	13
22	13
23	13
24	13
25	14
26	14
27	14
28	14
29	14
30	14
31	15

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°F)	Avg low (°F)
1	85	54
2	85	54
3	85	54
4	84	54
5	84	54
6	84	54
7	84	54
8	84	53
9	83	53
10	83	53
11	83	53
12	83	53
13	83	53
14	83	53
15	82	52
16	82	52
17	82	52
18	82	52
19	81	51
20	81	51
21	81	51
22	80	51
23	80	51
24	80	50
25	80	50
26	79	50
27	79	50
28	78	49
29	78	49
30	78	49
31	77	48

	Clearer (%)	Cloudier (%)
1	80	20
2	78	22
3	78	22
4	77	23
5	76	24
6	76	24
7	76	24
8	75	25
9	74	26
10	74	26
11	74	26
12	74	26
13	74	26
14	73	27
15	73	27
16	74	26
17	74	26
18	74	26
19	74	26
20	74	26
21	75	25
22	75	25
23	74	26
24	74	26
25	74	26
26	74	26
27	73	27
28	73	27
29	72	28
30	71	29
31	71	29

	Rain chance (%)
1	9
2	10
3	10
4	10
5	11
6	11
7	11
8	11
9	12
10	12
11	12
12	12
13	13
14	13
15	13
16	13
17	13
18	13
19	13
20	13
21	13
22	13
23	13
24	13
25	14
26	14
27	14
28	14
29	14
30	14
31	15

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100