Ottawa weather in July

In July, Ottawa sees average daytime highs of 83°F and overnight lows near 66°F, with 3.8 in of rain across 11.3 wet days and about 14.7 hours of daylight. It is the 1st-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 83°F through the month. The sky is clear or mostly clear about 36% of the time in July, and the air most often feels muggy.

Daylight stretches from about 15 hours at the start of July to 14 h 18 min by month's end. Set against the rest of the year, July is Ottawa's 3rd-clearest and 11th-windiest month. For the whole year in context, see Ottawa's year-round climate.

Daytime high
83°
1st warmest
Overnight low
66°
12th coldest
Rainfall
3.8 in
11.3 wet days
Daylight
14 h 42 min
4:40 AM – 7:22 PM
Cloud cover
54%
3rd clearest
Wind
7 mph
11th windiest
Solar energy
6.3 kWh/m²
Travel score
5.7
out of 10

Ottawa is city in Illinois, United States.

Density
553/km²
people per km²
Founded
1853

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

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 83°F through the month.

A typical July day in Ottawa reaches about 83°F in the afternoon and slips back to 66°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 76°F and 91°F. Set against its neighbours, July runs about 3°F warmer than June and about 2°F warmer than August.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18365
28365
38365
48365
58365
68365
78366
88366
98366
108366
118366
128366
138366
148366
158366
168366
178366
188366
198366
208366
218366
228366
238366
248366
258366
268366
278366
288365
298365
308365
318365

How July really feels in Ottawa

Once humidity and wind are folded in, July 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

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

Ottawa weather by month

How July compares with the rest of the year at a glance. July is the 1st-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan32° / 18°2.28.25.49.40.0
Feb37° / 21°2.07.24.210.30.0
Mar49° / 31°2.89.92.411.71.9
Apr61° / 41°4.311.90.613.14.8
May71° / 52°4.713014.36.1
Jun80° / 62°4.411.7014.96.2
Jul83° / 66°3.811.3014.75.7
Aug82° / 64°3.59.7013.76.6
Sep76° / 56°3.18.4012.37.1
Oct63° / 44°3.190.110.95.7
Nov49° / 33°2.78.61.19.72.1
Dec37° / 23°2.28.13.79.10.0

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 19% of July, with mostly cloudy or overcast conditions the remaining 44%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15644
25743
35743
45644
55644
65644
75743
85743
95644
105743
115644
125644
135545
145644
155545
165545
175545
185446
195446
205446
215446
225446
235545
245545
255545
265644
275644
285743
295743
305842
315743

Chance of precipitation in July

Any precipitation

Ottawa gets around 3.8 in of rain over 11.3 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
137
237
337
437
537
637
737
837
937
1037
1138
1238
1338
1438
1538
1638
1738
1837
1937
2037
2137
2236
2336
2436
2535
2635
2734
2833
2933
3032
3132

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the muggy band about 30% of days. Sticky, muggy-or-worse air turns up on roughly 51% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
112212329160
211212328161
311212328161
411202328171
511202329171
611192329171
710192330171
810182430171
910172431181
109172431181
119162432181
128162432191
138162332192
148152332202
157152332202
167152332212
177152332212
187152331212
197152331222
206152431223
216152430223
226152430223
236162430223
246162429222
256172429212
266182528212
276182528202
286192528202
297192627192
307202627192
317202627182

Wind in July

Winds average 7 mph in July.

Across July, 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
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 15 hours at the start of July to 14 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over July. Sunrise moves from 4:30 AM to 4:53 AM, and sunset from 7:27 PM to 7:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.04:307:27
214.94:317:27
314.94:317:27
414.94:327:27
514.94:327:27
614.94:337:26
714.94:337:26
814.94:347:26
914.94:357:26
1014.84:357:25
1114.84:367:25
1214.84:377:24
1314.84:377:24
1414.84:387:23
1514.74:397:23
1614.74:407:22
1714.74:407:22
1814.74:417:21
1914.64:427:20
2014.64:437:20
2114.64:447:19
2214.64:457:18
2314.54:467:17
2414.54:467:17
2514.54:477:16
2614.44:487:15
2714.44:497:14
2814.44:507:13
2914.34:517:12
3014.34:527:11
3114.34:537:10

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 6.3 kWh/m².

For context, solar energy here swings from a low near 1.72 kWh/m² to a high of 6.31 kWh/m² in June across the year — July's 6.3 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.5Intense
26.5Intense
36.5Intense
46.5Intense
56.5Intense
66.4Intense
76.4Intense
86.4Intense
96.4Intense
106.4Intense
116.4Intense
126.4Intense
136.3Intense
146.3Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.2Intense
206.2Intense
216.2Intense
226.2Intense
236.2Intense
246.2Intense
256.1Intense
266.1Intense
276.1Intense
286.1Intense
296.1Intense
306.1Intense
316.0Intense
Planning a trip in July

Is July a good time to visit Ottawa?

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

5.7
Sightseeing
5th-best month of the year
6.8
Beach & pool
2nd-best month of the year

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

What to pack for Ottawa in July

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

In July, Ottawa sees daytime highs around 83°F and nights near 66°F. Pack light clothes and sun protection. Worth having: rain gear. About 11 days see rain.

light clothessun protectionrain gear

UV index in Ottawa in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ottawa peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 20UV 9Dec 19UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Ottawa in July

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Ottawa is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJul 1917 µg/m³Oct 229 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb14Moderate
Mar14Moderate
Apr13Moderate
May14Moderate
Jun15Moderate
Jul17Moderate
Aug16Moderate
Sep12Moderate
Oct9Good
Nov9Good
Dec10Good
Location & terrain

Where is Ottawa?

Ottawa sits at 41.3°N, 88.8°W, 482 ft above sea level, in United States. The nearest listed city is Yorkville, 29 mi away.

Topography around Ottawa

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

Within 2 miles, the terrain around Ottawa has only modest variations in elevation — a maximum elevation change of 295 ft around an average of 531 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 417 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 692 ft.

The land around Ottawa is covered by trees (36%) and artificial surfaces (24%) within 2 miles, cropland (69%) within 10 miles, and cropland (78%) within 50 miles.

2 miles
295 ft
10 miles
417 ft
50 miles
692 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
July weather nearby: Yorkville 29 mi · Oswego 34 mi · Shorewood 35 mi · Montgomery 37 mi · Plainfield 39 mi · Aurora 39 mi · DeKalb 40 mi · Crest Hill 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 Ottawa (41.3456°, -88.8426°, elevation 482 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).