Watertown weather in August

In August, Watertown sees average daytime highs of 79°F and overnight lows near 61°F, with 3.5 in of rain across 10.2 wet days and about 13.8 hours of daylight. It is the 2nd-warmest and 4th-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 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 Watertown's 3rd-clearest and 12th-windiest month. For the whole year in context, see Watertown's year-round climate.

Daytime high
79°
2nd warmest
Overnight low
61°
11th coldest
Rainfall
3.5 in
10.2 wet days
Daylight
13 h 48 min
5:05 AM – 6:53 PM
Cloud cover
55%
3rd clearest
Wind
6 mph
12th windiest
Solar energy
5.31 kWh/m²
Travel score
6.8
out of 10

Watertown is city in Dodge County and Jefferson County, Wisconsin, United States.

Density
739/km²
people per km²

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 Watertown reaches about 79°F in the afternoon and slips back to 61°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 71°F and 86°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)
18063
28063
38062
48062
58062
68062
77962
87962
97962
107962
117962
127962
137961
147961
157861
167861
177861
187861
197861
207861
217861
227861
237861
247860
257860
267860
277860
287860
297759
307759
317759

How August really feels in Watertown

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.

Watertown weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan27° / 13°1.67.96.69.20.0
Feb31° / 16°1.66.95.510.20.0
Mar43° / 26°2.38.93.911.60.8
Apr56° / 38°3.712.11.913.13.5
May67° / 49°3.711.8014.45.8
Jun77° / 59°3.911.2015.16.6
Jul81° / 63°3.29.9014.96.6
Aug79° / 61°3.510.2013.86.8
Sep72° / 53°2.98.8012.36.9
Oct58° / 42°2.890.310.84.5
Nov44° / 30°2.17.929.50.9
Dec32° / 20°1.97.65.48.90.0

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 (%)
15644
25644
35743
45743
55644
65545
75545
85545
95446
105347
115347
125248
135248
145248
155347
165347
175347
185248
195248
205248
215347
225347
235347
245545
255545
265644
275644
285743
295743
305842
315842

Chance of precipitation in August

Any precipitation

Watertown gets around 3.5 in of rain over 10.2 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 32% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
134
234
333
433
532
632
732
832
932
1032
1132
1232
1332
1432
1532
1633
1733
1833
1933
2034
2134
2234
2334
2433
2533
2632
2731
2831
2930
3029
3129

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 26% of days. Sticky, muggy-or-worse air turns up on roughly 27% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1182527218
2182527218
3182527218
4182628208
5192527208
6192627208
7192627208
8202627207
9202626207
10202626207
11212626206
12212726216
13212726216
14212726215
15212726215
16212726225
17212726225
18212726234
19202725234
20202725244
21212725244
22212725244
23212725244
24222625234
25232625234
26242624224
27252524224
28272524213
29282524203
30302523193
31312423183

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 7 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
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 4:49 AM to 5:22 AM, and sunset from 7:13 PM to 6:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.44:497:13
214.44:507:12
314.34:517:11
414.34:527:09
514.24:537:08
614.24:547:07
714.24:557:06
814.14:577:04
914.14:587:03
1014.04:597:01
1114.05:007:00
1214.05:016:59
1313.95:026:57
1413.95:036:56
1513.85:046:54
1613.85:056:53
1713.75:076:51
1813.75:086:49
1913.75:096:48
2013.65:106:46
2113.65:116:45
2213.55:126:43
2313.55:136:41
2413.45:146:40
2513.45:166:38
2613.35:176:36
2713.35:186:35
2813.25:196:33
2913.25:206:31
3013.15:216:29
3113.15:226:27

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.31 kWh/m².

For context, solar energy here swings from a low near 1.54 kWh/m² to a high of 6.3 kWh/m² in June across the year — August's 5.31 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.7Bright
55.7Bright
65.6Bright
75.6Bright
85.6Bright
95.5Bright
105.5Bright
115.4Bright
125.4Bright
135.4Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
304.9Bright
314.9Bright
Planning a trip in August

Is August a good time to visit Watertown?

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

6.8
Sightseeing
2nd-best month of the year
6.4
Beach & pool
2nd-best month of the year

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

What to pack for Watertown in August

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

In August, Watertown sees daytime highs around 79°F and nights near 61°F. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Watertown in August

The nearest coast averages about 70°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 44 mi away) is warmest in August at about 70°F and coldest in March near 36°F.

It's comfortable for a long swim from Jul 29 to Aug 30 — about 1.1 months when the water holds above 68°F.

30°40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°F)Comfort
Jan38Bracing
Feb36Bracing
Mar36Bracing
Apr38Bracing
May42Bracing
Jun54Bracing
Jul67Cool
Aug70Refreshing
Sep66Cool
Oct56Bracing
Nov46Bracing
Dec41Bracing

UV index in Watertown 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 Watertown peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 19UV 9Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Watertown 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 Watertown is worst in July — around 15 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 1415 µg/m³Nov 118 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Moderate
Mar13Moderate
Apr12Good
May13Moderate
Jun14Moderate
Jul15Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Watertown?

Watertown sits at 43.2°N, 88.7°W, 853 ft above sea level, in United States. The nearest listed city is Oconomowoc, 13 mi away.

Topography around Watertown

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

Within 2 miles, the terrain around Watertown has only modest variations in elevation — a maximum elevation change of 180 ft around an average of 843 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 325 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,129 ft.

The land around Watertown is covered by grassland (28%), artificial surfaces (27%) and trees (26%) within 2 miles, cropland (57%) and trees (21%) within 10 miles, and cropland (47%) and trees (26%) within 50 miles.

2 miles
180 ft
10 miles
325 ft
50 miles
1,129 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Oconomowoc 13 mi · Beaver Dam 19 mi · Sun Prairie 24 mi · Waukesha 28 mi · Menomonee Falls 31 mi · Germantown 31 mi · West Bend 32 mi · Brookfield 33 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 Watertown (43.1947°, -88.729°, elevation 853 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).