2019-2020 Long Range Weather Forecast for London, ON

Get the Long Range Weather for Your Location

See long range weather forecasts for the next 60 days from The Old Farmer’s Almanac! Our long range forecasts can be used to make more informed decisions about future plans that depend on the weather, from vacations and weddings to sporting events and outdoor activities.

To see long term forecasts for the entire year, pick up a copy of The 2020 Old Farmer’s Almanac, available online and in stores.

Note: Long range forecasts are regional, not city-specific.

Free 2-Month Weather Forecast

August 2019 Long Range Weather Forecast for Southern Ontario
DatesWeather Conditions
Aug 1-8Scattered showers, warm
Aug 9-12T-storms, cool
Aug 13-17Scattered t-storms, hot
Aug 18-26A few showers, cool
Aug 27-31Sunny, cool
Augusttemperature 19°C (1° below avg.)
precipitation 100mm (20mm above avg.)

September 2019 Long Range Weather Forecast for Southern Ontario
DatesWeather Conditions
Sep 1-3Showers, cool
Sep 4-6T-storms, warm
Sep 7-20A few showers, cool
Sep 21-28Rain, then sunny, cool
Sep 29-30Rain east, snow west
Septembertemperature 13°C (2° below avg.)
precipitation 110mm (20mm above avg.)

Annual Weather Summary
November 2019 to October 2020

Winter temperatures, precipitation, and snowfall will be above normal. The coldest periods will be in mid- to late November, January, early and mid- to late February, and early March. The snowiest periods will be in early and mid-December, mid- to late January, mid-February, and early March. April and May will be warmer than normal, with precipitation above normal in the east and below normal in the west. Summer will be hotter than normal, with the hottest periods in late June and early to mid- and mid- to late July. Precipitation will be above normal in the east and below in the west. September and October will be slightly warmer and drier than normal.

Map showing Old Farmer's Almanac long range weather region number 3

About the Southern Ontario Region

The Southern Ontario long range weather region includes all or part of the following provinces: ONTARIO (Alliston, Amherstburg, Barrie, Bolton, Bradford, Brantford, Chatham, Cobourg, Collingwood, Elliot Lake, Fergus, Fort Erie, Georgetown, Guelph, Haileybury, Hamilton, Ingersoll, Kenora, Kitchener, Leamington, Lindsay, London, Midland, Milton, North Bay, Orangeville, Orillia, Oshawa, Owen Sound, Paris, Peterborough, Port Hope, Sarnia, Simcoe, Stouffville, Stratford, Strathroy, Sudbury, Thunder Bay, Tillsonburg, Timmins, Toronto, Uxbridge, Wallaceburg, Windsor, Woodstock).

Southern Ontario Neighboring Regions

Here are the regions that neighbor the Southern Ontario long range weather region:

Temperature and Precipitation November 2019 to October 2020

Temperature and Precipitation Chart, November 2019 to October 2020 for London, ON

Reader Comments

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Fishing trip

Going to inverhuron at the end of May camping,I was wondering what to expect weather wise?

Canoe trip

Also meant to ask if you have any suggestions for a better time to go weather wise

Proposed canoe trip

We are thinking of going on our annual 10 day canoe trip in the end of July, into August. Any idea of the weather we may expect in Algonquin park?

Outside wedding aug 24 2019

Hello was wandering if you might have an indication of the weather aug 24 or should we have in September instead? It’s our wedding in our new home backyard!


We too have planned our outdoor, backyard wedding for Aug 24. I could have wrote that post myself! Not really sure how this works and if the organization will reply to your question, but I’ll be looking for a response as well. We don’t really want tents . Thanks and good luck!!

Garden Party

Further to my inquiry: the date is Sunday July 28 2019 and is in Cambridge Ontario.

Parasol Weather

Hi, Teresa and Edwin: We show a few showers and slightly cooler (not a bad thing) that week, but on and off, nothing to worry about. We hope your mom has a nice party–she sure has nice kids! Have a parasol ready to shade her from showers OR sun! And thanks for asking!

whats the weather for July 28 2019

I want to have a garden party for my 90 yr. old Mother on July 28..want to know if I should go forward at my home or rent a hall..party is for 100.

Weather Forecast for Sunday July 28, 2019

Any idea what the weather will be on this day?


september and october 2019

How much cooler and rainier then normal will these 2 months be