Monthly climate averages for Ontario, United States. Based on 10-year ERA5 reanalysis data.
Csa Hot-Summer Mediterranean
Climate OverviewOntario, United States in July has hot conditions, with highs reaching 33.6°C (92°F) and afternoons the warmest part of the day. Rain is rare, falling on about 0 days this month. Temperatures drop noticeably between day and night.
This month falls at the middle of Summer. Temperatures are at their seasonal peak.
Daily highs in July gradually rise from around 32°C (90°F) at the start to 34°C (94°F) by month's end.
The warmest days tend to fall around the 31th, averaging 34.5°C (94°F).
Compared to June, this month is about 4°C warmer with 1 fewer rainy days.
Daily averages based on historical data (2016–2025)
With midday temperatures reaching 34°C (92°F), schedule outdoor activities for early morning or late afternoon.
Rain is uncommon in this month, so most days stay dry from morning through evening.
1 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 18°C / 7°C | 16°C / 4°C | 6days (93 mm) Good | 8.1h Good | 63% Muggy | 3.8 Moderate | Good | View Details |
| February | 19°C / 7°C | 17°C / 4°C | 7days (84 mm) Good | 8.8h Good | 60% Moderate | 4.3 Moderate | Good | View Details |
| March | 20°C / 8°C | 18°C / 6°C | 9days (87 mm) Wet | 9.9h Good | 69% Muggy | 5.9 High | Good | View Details |
| April best | 24°C / 11°C | 23°C / 9°C | 3days (23 mm) Excellent | 11.3h Excellent | 61% Muggy | 7.3 Very High | Excellent | View Details |
| May best | 25°C / 13°C | 25°C / 12°C | 2days (11 mm) Excellent | 12.1h Excellent | 65% Muggy | 8.1 Very High | Excellent | View Details |
| June best | 30°C / 16°C | 31°C / 16°C | 1days (2 mm) Excellent | 13.2h Excellent | 57% Moderate | 8.4 Very High | Excellent | View Details |
| July | 34°C / 20°C | 35°C / 21°C | 0days (1 mm) Excellent | 13.2h Excellent | 50% Moderate | 8.5 Very High | Good | View Details |
| August | 34°C / 20°C | 35°C / 21°C | 1days (9 mm) Excellent | 12.2h Excellent | 50% Moderate | 8 Very High | Good | View Details |
| September best | 32°C / 19°C | 32°C / 19°C | 1days (8 mm) Excellent | 11.2h Excellent | 54% Moderate | 7.1 Very High | Excellent | View Details |
| October best | 28°C / 15°C | 27°C / 13°C | 2days (12 mm) Excellent | 10.1h Excellent | 49% Moderate | 5.7 High | Excellent | View Details |
| November | 23°C / 10°C | 21°C / 8°C | 3days (37 mm) Excellent | 8.9h Good | 47% Moderate | 4.2 Moderate | Good | View Details |
| December | 19°C / 8°C | 17°C / 5°C | 5days (72 mm) Good | 7.8h Good | 57% Moderate | 3.4 Moderate | Good | View Details |
Light, breathable fabrics like cotton and linen are essential. Opt for loose-fitting clothing in light colors to stay cool.
Temperatures drop significantly at night, so pack layers you can add or remove throughout the day.
Last updated:
We use cookies to analyze traffic and improve your experience. No personal data is sold or shared with advertisers.
We use Google Analytics to understand how visitors use WorldStats. This helps us improve content and performance. Analytics cookies track page views and session data — no personally identifiable information is collected. You can change your preference at any time from the footer.
