Ottawa weather in July
In July, Ottawa has daytime highs averaging 26 °C, nights around 17 °C, with 12 wet days. Figures are 1991–2020 climate normals.
- 25.9°C Average high
- 16.6°C Average low
- 12days Wet days
- 97mm Rainfall
- 15h Daylight
Daily temperatures through July
How July develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 July | 25.8 °C | 16.0 °C | 40 % |
| 11–20 July | 26.2 °C | 16.8 °C | 39 % |
| 21–31 July | 25.8 °C | 16.9 °C | 35 % |
What to expect
| Measure | Typical July | Share of the month |
|---|---|---|
| Days above 25 °C | 18 of 31 | 58 % |
| Days above 30 °C | 3.7 of 31 | 12 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 12 of 31 | 38 % |
Conditions in July
| Measure | Average |
|---|---|
| Mean temperature | 21 °C |
| Record high (1991–2020) | 36 °C |
| Record low (1991–2020) | 9.0 °C |
| Relative humidity | 72 % |
| Wind speed | 14 km/h |
| Cloud cover | 55 % |
Where Ottawa ranks in July
| Ranking | Position | Value |
|---|---|---|
| Places with the best weather in North America in July | 48th of 50 | 82/100 |
July compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| May | 18.9 °C | 88 mm | 61 % |
| June | 23.6 °C | 100 mm | 61 % |
| July | 25.9 °C | 97 mm | 55 % |
| August | 24.8 °C | 91 mm | 56 % |
| September | 20.7 °C | 95 mm | 57 % |
See all twelve months for Ottawa
- July is the warmest month in Ottawa.
- It is the 10th driest month of the year.
- It ranks 1st for least cloud cover.
- Days last about 15 hours from sunrise to sunset.
- It rains on 12 of 31 days — 38 % of the month.
- Nights are about 9.3 °C cooler than the middle of the day.
- The hottest July day on record since 1991 reached 36 °C, 9.6 °C above the usual daytime high.
QuestionsJuly in Ottawa, answered
How warm is Ottawa in July?
Daily highs average 26 °C and nights fall to about 17 °C, a spread of 9.3 °C between afternoon and dawn. That makes July the 1st warmest month of the year here.
Does it rain much in Ottawa in July?
July averages 97 mm of rain, spread over about 12 of the 31 days — 38 % of the month. Cloud cover averages 55 % of the sky.
How long are the days in July?
Ottawa averages 15 hours between sunrise and sunset in July. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.