Portage weather in August

In August, Portage sees average daytime highs of 79°F and overnight lows near 61°F, with 3.8 in of rain across 11.1 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 79°F through the month. The sky is clear or mostly clear about 34% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 14 h 18 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Portage's 3rd-clearest and 12th-windiest month. For the whole year in context, see Portage's year-round climate.

Daytime high
79°
2nd warmest
Overnight low
61°
11th coldest
Rainfall
3.8 in
11.1 wet days
Daylight
13 h 42 min
5:55 AM – 7:38 PM
Cloud cover
56%
3rd clearest
Wind
6 mph
12th windiest
Solar energy
5.33 kWh/m²
Travel score
6.6
out of 10

Portage is city in Kalamazoo County, Michigan, United States of America.

Density
529/km²
people per km²
Founded
1830

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 79°F through the month.

A typical August day in Portage reaches about 79°F in the afternoon and slips back to 61°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 71°F and 87°F. Set against its neighbours, August runs about 2°F cooler than July and about 7°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18163
28063
38062
48062
58062
68062
78062
88062
98062
108062
118062
127962
137962
147961
157961
167961
177961
187961
197961
207961
217961
227961
237961
247961
257960
267860
277860
287860
297860
307859
317859

How August really feels in Portage

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
0
heat index over the day's high
Days feeling ≤ 32°F
0
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.

Portage weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan31° / 19°2.811.310.49.30.0
Feb34° / 20°2.28.36.610.30.0
Mar45° / 28°2.710.24.411.61.0
Apr57° / 39°3.912.71.413.13.8
May68° / 49°4.413.1014.45.8
Jun78° / 59°4.311.70156.4
Jul81° / 63°4.011.4014.86.3
Aug79° / 61°3.811.1013.76.6
Sep73° / 54°3.19.7012.36.8
Oct60° / 43°3.4110.210.84.6
Nov46° / 33°2.810.139.61.3
Dec36° / 25°2.5117.990.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% 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 46%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25743
35743
45644
55644
65545
75545
85446
95347
105347
115248
125248
135248
145149
155149
165149
175248
185149
195248
205248
215248
225248
235248
245347
255446
265446
275545
285644
295644
305644
315743

Chance of precipitation in August

Any precipitation

Portage gets around 3.8 in of rain over 11.1 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 35% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
138
237
337
437
536
636
736
836
936
1036
1136
1236
1337
1437
1536
1636
1736
1836
1936
2036
2136
2236
2335
2434
2534
2633
2732
2832
2931
3031
3131

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the comfortable band about 27% of days. Sticky, muggy-or-worse air turns up on roughly 31% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11228292110
21228282110
31328282110
41329272110
51329272110
61328272210
7142826229
8142826229
9152726239
10152725239
11162725248
12162725248
13162724248
14162824247
15172724257
16172725257
17172725256
18172625266
19172625266
20172625265
21182525265
22182525265
23192525265
24192525265
25202525255
26212525255
27222524244
28232524244
29242524234
30252523224
31262623214

Wind in August

Winds average 6 mph in August, the calmest month.

Across August, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 18 min at the start of August to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over August. Sunrise moves from 5:39 AM to 6:11 AM, and sunset from 7:58 PM to 7:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.35:397:58
214.35:407:57
314.25:417:56
414.25:427:54
514.25:437:53
614.15:447:52
714.15:457:51
814.15:467:49
914.05:477:48
1014.05:487:47
1113.95:497:45
1213.95:507:44
1313.95:517:43
1413.85:537:41
1513.85:547:40
1613.75:557:38
1713.75:567:37
1813.65:577:35
1913.65:587:34
2013.55:597:32
2113.56:007:30
2213.56:017:29
2313.46:027:27
2413.46:037:26
2513.36:047:24
2613.36:067:22
2713.26:077:21
2813.26:087:19
2913.16:097:17
3013.16:107:16
3113.06:117:14

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.33 kWh/m².

For context, solar energy here swings from a low near 1.4 kWh/m² to a high of 6.36 kWh/m² in June across the year — August's 5.33 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.7Bright
55.7Bright
65.7Bright
75.6Bright
85.6Bright
95.5Bright
105.5Bright
115.5Bright
125.4Bright
135.4Bright
145.4Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.2Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
314.9Bright
Planning a trip in August

Is August a good time to visit Portage?

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

6.6
Sightseeing
2nd-best month of the year
6.4
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Portage for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Portage in August

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

In August, Portage sees daytime highs around 79°F and nights near 61°F. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near Portage in August

The nearest coast averages about 72°F in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 42 mi away) is warmest in August at about 72°F and coldest in March near 36°F.

It's comfortable for a long swim from Jul 14 to Sep 13 — about 2 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan39Bracing
Feb37Bracing
Mar36Bracing
Apr39Bracing
May45Bracing
Jun58Bracing
Jul69Refreshing
Aug72Refreshing
Sep68Cool
Oct59Bracing
Nov49Bracing
Dec43Bracing

UV index in Portage in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Portage peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 22UV 9Dec 21UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr6High
May7High
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Portage 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 Portage is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1515 µg/m³Oct 228 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar13Moderate
Apr12Moderate
May14Moderate
Jun15Moderate
Jul16Moderate
Aug15Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Portage?

Portage sits at 42.2°N, 85.6°W, 879 ft above sea level, in United States. The nearest listed city is Kalamazoo, 6.2 mi away.

Topography around Portage

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

Within 2 miles, the terrain around Portage has only modest variations in elevation — a maximum elevation change of 141 ft around an average of 876 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 358 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 679 ft.

The land around Portage is covered by trees (50%) and artificial surfaces (23%) within 2 miles, trees (48%) and cropland (24%) within 10 miles, and trees (42%) and cropland (37%) within 50 miles.

2 miles
141 ft
10 miles
358 ft
50 miles
679 ft
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: Kalamazoo 6.2 mi · Battle Creek 22 mi · Granger 41 mi · Elkhart 41 mi · Goshen 45 mi · Kentwood 47 mi · Mishawaka 48 mi · Holland 48 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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Portage (42.2011°, -85.58°, elevation 879 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).