AI-generatedLondon, Ontario at a glance
- Best time
- May – Sep
- Warmest month
- Jul · 26°
- Sunshine a year
- 2,070 h
- Rain a year
- 989 mm
- Climate
- Continental
- Time zone
- UTC−5 / UTC−4
- Elevation
- 252 m
Climate in London, Ontario
London, Ontario has warm to hot summers and cold winters with occasional snow. July is the warmest month with average highs of 26 °C, while January is the coolest at −1 °C. With around 2,070 hours of sunshine a year, London, Ontario is moderately sunny; July is the sunniest month with 8.9 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Fair
Best time to visit: May – September
Keep in mindFrequent rain
A typical day in October
- Morning, 08:00: about 8°
- Midday, 13:00: about 14°
- Afternoon, 16:00: about 14°
- Evening, 20:00: about 12°
- Night, 23:00: about 10°
07:3718:44
Cool evenings: pack a jumper or a jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:19–08:15 · evening 18:06–19:02
- Blue hour
- Morning 07:08–07:19 · evening 19:02–19:13
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in London, Ontario in October?
In October, London, Ontario is cool: daytime highs average 15 °C, and nights cool down to about 8 °C. Expect around 5 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 84 mm in total. All in all, October is a so-so month for a holiday in London, Ontario.
More details for October
- Daylight
- 11 h 7 min07:37 – 18:44
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 61 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/Toronto
How the score comes together
- Temperatureweight 50 %65 %
- Sunshineweight 20 %25 %
- Few rainy daysweight 30 %43 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Sunshine hours in London, Ontario
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 4.5 of 11.1 hours of daylight in London, Ontario, 41 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in London, Ontario
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 3 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 9).
Minutes until sunburn in October
- Very fair skin
- about 40 min
- Fair skin
- about 50 min
- Light brown skin
- about 65 min
- Olive skin
- about 85 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in London, Ontario: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, London, Ontario has about 12 rainy days with 84 mm of rain in total.
Wind and clouds in London, Ontario
How breezy and how cloudy London, Ontario is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in London, Ontario typically peaks at 19 km/h during the day: Beaufort 3, light breeze.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 61 % of the sky over London, Ontario: variable cloud, with about 4.5 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in London, Ontario
How often the day gets hot in London, Ontario (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, London, Ontario has about 0 hot days, with an average daytime high of 15 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Snow in London, Ontario
When London, Ontario is likely to be white: the chance of seeing snow during a week's stay, the days with fresh snow and how much falls. Tap a month to select it.
Snow calendar
- hardly any
- possible
- likely
- very likely
In October, it hardly ever snows in London, Ontario.
Snow days bring at least 1 cm of fresh snow. Fresh snow comes from ERA5 snowfall (1996–2025) at the height of the place, not on the slopes above it; the snow chance also weighs whether the snow settles. An estimate from climate averages, not a snow report.
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in London, Ontario
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Frost below 0°
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
CoolOctober: nights around 8°. A duvet at night and a jumper for the evening.
The coolest nights are in February (−9°), the warmest in July (17°). Nights are pleasant for sleeping (15 to 20 °C) from June to August. Nights fall below 8 °C on average from November to April, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|
| JanuaryJan | 13 | −1° | −8° | 2.8 h | 12 | 70 |
| FebruaryFeb | 21 | 0° | −9° | 4.1 h | 10 | 63 |
| MarchMar | 22 | 5° | −4° | 5.3 h | 11 | 72 |
| AprilApr | 42 | 12° | 2° | 6.4 h | 13 | 91 |
| MayMay | 77 | 19° | 9° | 7.5 h | 13 | 95 |
| JuneJun | 81 | 24° | 15° | 8.5 h | 12 | 103 |
| JulyJul | 83 | 26° | 17° | 8.9 h | 12 | 98 |
| AugustAug | 82 | 25° | 17° | 7.7 h | 10 | 84 |
| SeptemberSep | 80 | 22° | 14° | 6.4 h | 9 | 84 |
| OctoberOct | 50 | 15° | 8° | 4.5 h | 12 | 84 |
| NovemberNov | 16 | 8° | 1° | 3.5 h | 11 | 71 |
| DecemberDec | 13 | 2° | −4° | 2.2 h | 12 | 74 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
42.98° N, 81.23° W · 252 m · America/Toronto
Best time to visit London, Ontario
The best time to visit London, Ontario is from May to September. For sightseeing, day trips and hiking, conditions are most comfortable from July to September. Rain is most frequent in January and from April to June and in October; the wettest month is June with 103 mm.
London, Ontario through the seasons
How the weather changes over the seasons, with averages for each.
London, Ontario in spring
Mar – May
Fair
- 5–19 °C by day
- 6 h of sun a day
- 37 rainy days in all
London, Ontario in summer
Jun – Aug
Excellent
- 24–26 °C by day
- 8 h of sun a day
- 35 rainy days in all
London, Ontario in autumn
Sep – Nov
Fair
- 8–22 °C by day
- 5 h of sun a day
- 33 rainy days in all
London, Ontario in winter
Dec – Feb
Poor
- -1–2 °C by day
- 3 h of sun a day
- 34 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in London, Ontario for you.
Your best months: June, August – September
Based on the climate averages; tap a month to see its details.
Compare two months in London, Ontario
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
July has the better holiday weather in London, Ontario: score 83 against 50. In July, days are 11 °C warmer than in October. The sun shines 4 hours longer a day in July.
| Month | October | July |
|---|---|---|
| Weather score | 50 | 83better |
| Day high | 15° | 26° |
| Night low | 8° | 17° |
| Sunshine | 4.5 h | 8.9 hbetter |
| Rainy days | 12 | 12 |
| Rainfall | 84 mmbetter | 98 mm |
| Muggy days | 0better | 10 |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No sea nearby
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Jul – Sep
15–28 °C and not too much rain
Rainy months
Jan, Apr – Jun, Oct
12 or more rainy days
Snow
Nov – Mar
Snow on 2 or more days
London, Ontario month by month
The typical weather for every month at a glance.
13January-1° · 3 h
In January, London, Ontario is freezing cold: daytime highs average −1 °C, and nights often drop below freezing (−8 °C). The sun is scarce, with only about 3 hours a day. Precipitation, often as snow, falls on about 12 days, totalling 70 mm. Snow falls on about 8 days. All in all, January is not an ideal month for a holiday in London, Ontario.
London, Ontario in January21February0° · 4 h
In February, London, Ontario is freezing cold: daytime highs average 0 °C, and nights often drop below freezing (−9 °C). Expect around 4 hours of sunshine a day. Precipitation, often as snow, falls on about 10 days, totalling 63 mm. Snow falls on about 7 days. All in all, February is not an ideal month for a holiday in London, Ontario.
London, Ontario in February22March5° · 5 h
In March, London, Ontario is cold: daytime highs average 5 °C, and nights often drop below freezing (−4 °C). Expect around 5 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 72 mm in total. Snow falls on about 4 days. All in all, March is not an ideal month for a holiday in London, Ontario.
London, Ontario in March42April12° · 6 h
In April, London, Ontario is cool: daytime highs average 12 °C, and nights cool down to about 2 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 91 mm in total. Snow falls on about 2 days. All in all, April is a so-so month for a holiday in London, Ontario.
London, Ontario in April77May19° · 8 h
In May, London, Ontario is mild: daytime highs average 19 °C, and nights cool down to about 9 °C. The sun shines for around 8 hours a day. Rain is frequent, with about 13 rainy days and 95 mm in total. All in all, May is a good month for a holiday in London, Ontario.
London, Ontario in May81June24° · 9 h
In June, London, Ontario is warm: daytime highs average 24 °C, and nights cool down to about 15 °C. The sun shines for around 9 hours a day. Rain is frequent, with about 12 rainy days and 103 mm in total. All in all, June is an excellent month for a holiday in London, Ontario.
London, Ontario in June83July26° · 9 h
In July, London, Ontario is warm: daytime highs average 26 °C, and nights cool down to about 17 °C. The sun shines for around 9 hours a day. Rain is frequent, with about 12 rainy days and 98 mm in total. All in all, July is an excellent month for a holiday in London, Ontario.
London, Ontario in July82August25° · 8 h
In August, London, Ontario is warm: daytime highs average 25 °C, and nights cool down to about 17 °C. The sun shines for around 8 hours a day. Rain is frequent, with about 10 rainy days and 84 mm in total. All in all, August is an excellent month for a holiday in London, Ontario.
London, Ontario in August80September22° · 6 h
In September, London, Ontario is warm: daytime highs average 22 °C, and nights cool down to about 14 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 84 mm in total. All in all, September is an excellent month for a holiday in London, Ontario.
London, Ontario in September50October15° · 5 h
In October, London, Ontario is cool: daytime highs average 15 °C, and nights cool down to about 8 °C. Expect around 5 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 84 mm in total. All in all, October is a so-so month for a holiday in London, Ontario.
London, Ontario in October16November8° · 4 h
In November, London, Ontario is cold: daytime highs average 8 °C, and nights cool down to about 1 °C. The sun is scarce, with only about 4 hours a day. Rain is frequent, with about 11 rainy days and 71 mm in total. Snow falls on about 3 days. All in all, November is not an ideal month for a holiday in London, Ontario.
London, Ontario in November13December2° · 2 h
In December, London, Ontario is freezing cold: daytime highs average 2 °C, and nights often drop below freezing (−4 °C). The sun is scarce, with only about 2 hours a day. Precipitation, often as snow, falls on about 12 days, totalling 74 mm. Snow falls on about 7 days. All in all, December is not an ideal month for a holiday in London, Ontario.
London, Ontario in DecemberLondon, Ontario compared
Put London, Ontario side by side with another destination.
No destination found
London vs. Hamilton
In October the holiday weather in London and Hamilton is about equally good (score 50 vs. 53). During the day it is about as warm in Hamilton as in London.
| in October | London | Hamilton |
|---|---|---|
| Holiday score | 50 | 53 |
| Daytime high | 15° | 15° |
| Sunshine | 5 h | 5 h |
| Rainy days | 12 | 11 |
| Best time | May – Sep | Jun – Sep |
Through the year
Canada in October: the best places
In October, London, Ontario ranks 5 among the 31 nearest destinations in this country.
- Hamilton15°53
- 2Toronto14°52
- 3Niagara Falls15°51
- 4Niagara-on-the-Lake15°51
- 5LondonThis page15°50
- 6Halifax14°14°49
- 7Collingwood (Blue Mountains)13°47
- 8Kingston14°44
Planning a trip to London, Ontario
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
London, Ontario in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
London, Ontario has its best school-holiday weather during the summer holidays (score 82) and its weakest during the Christmas holidays (score 13).
- 36
Easter holidays
Mar – Apr
Poor
- 10 °C by day
- 6.1 h of sun a day
- 12 rainy days a month
Keep in mind: Frequent rain, Snow
- 78
May half-term
May – Jun
Good
- 20 °C by day
- 7.7 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 82
Summer holidays
Jul – Aug
ExcellentBest holidays
- 25 °C by day
- 8.1 h of sun a day
- 11 rainy days a month
Good for: Sightseeing & walks
- 50
October half-term
Oct
Fair
- 15 °C by day
- 4.5 h of sun a day
- 12 rainy days a month
Keep in mind: Frequent rain
- 13
Christmas holidays
Dec – Jan
Poor
- 0 °C by day
- 2.5 h of sun a day
- 12 rainy days a month
Keep in mind: Frequent rain, Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 7 h 35 min
- Distance
- 5,860 km
- Time zone
- UTC−4
- Jet lag
- About 3 days (5 h west)
Rule of thumb for flying west: for a few days before, stay up a little later, and get afternoon and evening light at your destination.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about London, Ontario
When is the best time to visit London, Ontario?
The best time to visit London, Ontario is from May to September. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
What is the warmest month in London, Ontario?
July is the warmest month, with average highs of 26 °C and nights around 17 °C. January is the coolest month at −1 °C.
When does it rain most in London, Ontario?
Rain is most frequent in January and from April to June and in October; the wettest month is June with 103 mm. The driest month is February with 63 mm.
How many hours of sunshine does London, Ontario get?
London, Ontario gets around 2,070 hours of sunshine a year. The sunniest month is July with 8.9 hours a day; in December there are 2.2 hours a day.
What time zone is London, Ontario in?
London, Ontario uses the time zone America/Toronto: UTC−5 in January and UTC−4 in July.
How long is the flight from London to London, Ontario?
A nonstop flight from London to London, Ontario takes about 7 h 35 min, for a straight-line distance of about 5,860 km.
Which school holidays are best for London, Ontario?
London, Ontario has its best school-holiday weather during the summer holidays (score 82) and its weakest during the Christmas holidays (score 13). Holiday ratings (0–100): Easter holidays 36, May half-term 78, Summer holidays 82, October half-term 50, Christmas holidays 13.
Near London, Ontario
Other destinations close by.
Places with a climate like London, Ontario
Destinations whose weather through the year is closest to London, Ontario's – good alternatives.