TORONTO, June 20, 2025
A scorching heat wave is poised to bake Southern Ontario just in time for summer, promising record-breaking temperatures and uncomfortable humidity.
Get ready to sweat: Southern Ontario is bracing for a prolonged heat wave starting this weekend, with temperatures expected to soar into the 30s.
- Temperatures will hit the low to mid-30s for at least three days in southern Ontario.
- The hottest day is expected to be Monday, with a high above 35 C in Toronto.
- A cool front will bring an end to the heat on Tuesday or Wednesday.
Will this be a scorcher? Yes! Temperatures are forecast to hit the low to mid-30s Celsius for at least three days across southern ontario, according to meteorologist Anthony Farnell. The heat wave is expected to build over the Ohio Valley and spread into southeastern Canada by the weekend.
Heat Dome on the Horizon
With the summer solstice arriving Friday, marking the longest day of the year, residents will finally feel the full force of the heat after a fluctuating spring.
Did you know?-A heat dome occurs when high-pressure air traps warm air over a region. Sinking air acts like a lid,preventing the hot air from rising and dispersing,leading to sustained high temperatures.
Temperatures are forecast to climb into the low to mid-30s for at least three days in southern Ontario and two or more days in quebec, Farnell said.
The peak of the heat wave is projected to be on Monday. Toronto’s high coudl surpass 35 C,and the humidex could briefly reach as high as 45 C.
did you know?-This could be the hottest temperatures in three years for this time of year.
A cool front is expected to move in from the south, beginning Tuesday and extending into Wednesday. This front should bring an end to the intense heat. There is also a risk of “very strong thunderstorms” along the warm front as the heat and humidity move in this weekend.
Monday snapshot across Ontario and Quebec.
While computer models have not pinpointed the exact timing or location, farnell noted that people in cottage country and eastern Ontario should be prepared for a possible “light show” late Saturday or Sunday morning.
Pro tip:-Stay hydrated by drinking plenty of water, even before you feel thirsty.Avoid sugary drinks and alcohol, as they can dehydrate you. Wear light-colored, loose-fitting clothing to stay cool.
Even after the heat wave subsides,temperatures will remain above seasonal averages until Canada Day.
“The first heat wave of the year is always more risky because our bodies haven’t yet adapted,” Farnell said.
Forecast for the Weekend
According to Surroundings Canada, Toronto is expected to reach 25 C on Friday, 28 C on Saturday, and the 30s for Sunday, Monday, and Tuesday.
Reader question:-How can I protect my pets during the heat wave? Never leave pets in parked cars. Provide plenty of fresh water and shade. Avoid strenuous exercise during the hottest part of the day. Watch for signs of heatstroke.
© 2025
Beyond the Heat: Staying Connected in a Warming World
Beyond the immediate discomfort of rising temperatures,the heat wave also presents challenges to our digital lives: slower internet upload speeds stemming from network congestion.Residents of Toronto, already dealing with the heat, might find their online activities impacted, from streaming to uploading content or gaming. This section delves into potential causes and offers tips for mitigating slow upload speeds, considering the overlap with heat-related impacts on technology and utilities.
Toronto residents are especially vulnerable due to potential congestion stemming from increased internet use during extreme heat, which can cause slower upload times for a variety of internet services and devices [[1]].
Deconstructing Slow Upload Speeds
Several factors can contribute to slow upload speeds, especially during peak usage times when a heat wave has driven more people indoors consuming bandwidth. These include:
- Network Congestion: As more users across Toronto go online together, especially when working from home or seeking indoor entertainment during the heat wave, the network can become overloaded [[1]].
- ISP Throttling: Internet Service providers (ISPs) may throttle upload speeds if they detect excessive usage.
- Router and Modem Issues: Older or malfunctioning equipment can bottleneck speeds. Consider checking connections and restarting your router and modem. Resetting your network equipment can sometimes resolve unexpected slow-down occurrences.
- Torrent Downloads/Streaming: These bandwidth-intensive activities can considerably impact upload speeds if other uses of the network are not prioritized [[1]].
- Device Limitations: Older devices or those running numerous background processes might struggle to upload data fast.
- Port Settings: Incorrect port forwarding configurations on your router or the software you are using, can lead to slowed transfers [[3]].
Tips to Boost Your Upload Speed
Improving upload speeds often requires a blend of technical adjustments and smart online habits. These are simple, effective changes you can make:
- Optimize Router placement: Place your router in a central location, away from obstructions, and electronic devices.
- restart Your Equipment: A simple restart of your modem and router can often clear up temporary bottlenecks.
- Limit Bandwidth Consumption: Pause downloads, and limit streaming during crucial upload activities.
- Close Unneeded Applications: Shut down background apps or programs that use network bandwidth.
- Check for Device Limits: Ensure your devices are up to date, and that devices are not suffering from operating errors.
- Contact Your ISP: If problems persist, contact your ISP to check for outages or throttling.
- Configure Port Forwarding: Proper port configuration might positively influence upload speeds [[3]].
Are slower upload speeds due to the heat wave? The increased internet usage during heat waves can contribute to overall network congestion, impacting upload speeds. What steps can a user take to combat slow uploads? Users can restart their equipment, limit bandwidth consumption, and check for device limitations.
Why This matters During a Heat Wave
Beyond the inconvenience, slow upload speeds can heighten the frustration of dealing with the heat. Think about the implications of slow uploads such as:
- Remote work: Slow uploads affect video conferencing, file sharing, and overall productivity.
- Online entertainment: Frustration during a heat wave from laggy online games or disruptions to your streaming video enjoyment.
- Social Connectivity: Slow uploads may impede the sharing of vacation photos, heat wave experiences, or other content.
By understanding the contributing factors and implementing these practical tips, Toronto residents can stay connected and productive, even when the heat is on. Remember to stay cool, stay hydrated, and protect your online experience from those slow upload speeds.