Port Huron weather in August

In August, Port Huron sees average daytime highs of 77°F and overnight lows near 64°F, with 2.8 in of rain across 10.4 wet days and about 13.8 hours of daylight. It is the 2nd-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 77°F through the month. The sky is clear or mostly clear about 33% of the time in August, and the air most often feels humid.

Daylight stretches from about 14 h 24 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Port Huron's 2nd-clearest and 12th-windiest month. For the whole year in context, see Port Huron's year-round climate.

Daytime high
77°
2nd warmest
Overnight low
64°
11th coldest
Rainfall
2.8 in
10.4 wet days
Daylight
13 h 48 min
5:41 AM – 7:27 PM
Cloud cover
55%
2nd clearest
Wind
7 mph
12th windiest
Solar energy
5.33 kWh/m²
Travel score
6.9
out of 10

Port Huron is city in Michigan, United States.

Density
923/km²
people per km²
Founded
1814

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 77°F through the month.

A typical August day in Port Huron reaches about 77°F in the afternoon and slips back to 64°F overnight — a 13°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 84°F. Set against its neighbours, August runs about 2°F cooler than July and about 6°F warmer than September.

50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
17865
27865
37865
47865
57865
67865
77865
87865
97865
107864
117864
127764
137764
147764
157764
167764
177764
187764
197764
207764
217763
227763
237663
247663
257663
267663
277662
287662
297662
307662
317562

How August really feels in Port Huron

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.

Port Huron weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan30° / 19°2.39.67.39.20.0
Feb32° / 20°2.08.46.310.20.0
Mar40° / 27°2.29.64.611.60.3
Apr52° / 38°3.311.41.813.12.7
May64° / 49°3.312014.45.4
Jun74° / 60°3.410.8015.16.7
Jul79° / 65°2.811014.86.6
Aug77° / 64°2.810.4013.86.9
Sep71° / 56°2.99.1012.36.7
Oct58° / 46°3.010.80.110.84.3
Nov46° / 36°2.69.72.49.51.2
Dec35° / 26°2.29.45.68.90.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 22% of August, with mostly cloudy or overcast conditions the remaining 45%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25743
35743
45743
55743
65644
75644
85644
95545
105545
115545
125545
135545
145545
155545
165545
175545
185545
195446
205545
215545
225446
235545
245545
255545
265545
275644
285545
295545
305545
315644

Chance of precipitation in August

Any precipitation

Port Huron gets around 2.8 in of rain over 10.4 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 34% and peaks near 37% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
137
237
337
437
537
637
737
836
936
1036
1136
1236
1335
1435
1535
1634
1734
1833
1933
2033
2132
2232
2331
2430
2530
2629
2729
2829
2929
3029
3129

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 28% of days. Sticky, muggy-or-worse air turns up on roughly 32% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
192630278
292630278
392630278
492630278
5102630277
6102630277
7102629277
8112629277
9112629277
10122728277
11122728276
12122728276
13132827276
14132827275
15132827275
16132827275
17132827274
18132827274
19142827274
20142827274
21142827274
22142827274
23142827274
24152827264
25152827264
26162827254
27162827244
28172827244
29182827234
30192827224
31202926214

Wind in August

Winds average 7 mph in August, the calmest month.

Across August, daily wind ranges from about 7 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 24 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over August. Sunrise moves from 5:24 AM to 5:57 AM, and sunset from 7:47 PM to 7:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.45:247:47
214.35:257:46
314.35:267:45
414.35:277:44
514.25:297:42
614.25:307:41
714.25:317:40
814.15:327:38
914.15:337:37
1014.05:347:36
1114.05:357:34
1213.95:367:33
1313.95:377:31
1413.95:387:30
1513.85:407:28
1613.85:417:27
1713.75:427:25
1813.75:437:24
1913.65:447:22
2013.65:457:21
2113.55:467:19
2213.55:477:17
2313.55:487:16
2413.45:507:14
2513.45:517:12
2613.35:527:11
2713.35:537:09
2813.25:547:07
2913.25:557:06
3013.15:567:04
3113.15:577:02

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 1.36 kWh/m² to a high of 6.37 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
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.4Bright
145.4Bright
155.4Bright
165.3Bright
175.3Bright
185.3Bright
195.2Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.1Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.9Bright
314.8Bright
Planning a trip in August

Is August a good time to visit Port Huron?

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

6.9
Sightseeing
1st-best month of the year
6.2
Beach & pool
2nd-best month of the year

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

What to pack for Port Huron in August

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

In August, Port Huron sees daytime highs around 77°F and nights near 64°F. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Port Huron in August

The nearest coast averages about 71°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 11 mi away) is warmest in August at about 71°F and coldest in February near 33°F.

It's comfortable for a long swim from Jul 19 to Sep 8 — about 1.7 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan36Bracing
Feb33Bracing
Mar34Bracing
Apr37Bracing
May44Bracing
Jun57Bracing
Jul68Refreshing
Aug71Refreshing
Sep67Cool
Oct58Bracing
Nov49Bracing
Dec41Bracing

UV index in Port Huron in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Port Huron peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 20UV 9Dec 20UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr5High
May7High
Jun9Very high
Jul8Very high
Aug7High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Port Huron 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 Port Huron is worst in July — around 15 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1415 µg/m³Oct 248 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar13Moderate
Apr13Moderate
May14Moderate
Jun15Moderate
Jul15Moderate
Aug14Moderate
Sep12Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Port Huron?

Port Huron sits at 43.0°N, 82.4°W, 604 ft above sea level, in United States. The nearest listed city is Sarnia, 1.2 mi away.

Topography around Port Huron

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

Within 2 miles, the terrain around Port Huron has only modest variations in elevation — a maximum elevation change of 79 ft around an average of 597 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 246 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 705 ft.

The land around Port Huron is covered by artificial surfaces (53%) within 2 miles, trees (29%), cropland (26%) and water (21%) within 10 miles, and cropland (45%) and water (25%) within 50 miles.

2 miles
79 ft
10 miles
246 ft
50 miles
705 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Sarnia 1.2 mi · Mount Clemens 35 mi · Clinton Township 37 mi · Shelby 37 mi · Saint Clair Shores 40 mi · Chatham 40 mi · Strathroy 40 mi · Sterling Heights 41 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 Port Huron (42.9709°, -82.4249°, elevation 604 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).