Weather in Mississauga - 14-day forecast

Detailed weather forecast for Mississauga, Canada: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.

Forecast for the next days in Mississauga

today☀️ 22°💧 0.5 mm

Sun🌧️ 20°💧 0.3 mm

Mon🌤️ 24°💧 0.3 mm

Tue☁️ 22°💧 0.5 mm

Wed🌧️ 29°💧 0.2 mm

Thu☁️ 16°💧 4.2 mm

Fri☀️ 19°💧 4.9 mm

Sat🌤️ 22°💧 2.2 mm

Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Wednesday 9 Sept in Mississauga, the forecast high is 29°C. Typical daytime temperatures at this time of year range from 19°C to 25°C, so it will be exceptionally warm. It is warmer than 100% of similar days.

Saturday 5 Sept

22°Cnear normal

usually 19°C–25°C

night: warmer than usual rain: typical rainfall wind: lighter than usual

Sunday 6 Sept

20°Cnear normal

usually 19°C–25°C

night: near normal rain: typical rainfall wind: exceptionally light

Monday 7 Sept

24°Cnear normal

usually 19°C–25°C

night: warmer than usual rain: typical rainfall wind: exceptionally light

Tuesday 8 Sept

22°Cnear normal

usually 19°C–25°C

night: warmer than usual rain: typical rainfall wind: exceptionally light

Wednesday 9 Sept

29°Cexceptionally warm

usually 19°C–25°C

warmer than 100% of similar days

night: warmer than usual rain: typical rainfall wind: stronger than usual

Thursday 10 Sept

16°Cexceptionally cool

usually 19°C–24°C

cooler than 93% of similar days

night: cooler than usual rain: more rain than usual wind: stronger than usual

Friday 11 Sept

19°Ccooler than usual

usually 18°C–24°C

cooler than 77% of similar days

night: cooler than usual rain: more rain than usual wind: exceptionally light

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →

cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 21°C by day. The coolest year was 1988 (17°C) and the warmest was 2016 (27°C). The current forecast averages 22°C - close to the historical median.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Mississauga

Mississauga - 14-day weather forecast infographic

Mississauga 30 & 45-day weather - long-range outlook

Next 15 days · forecast

24°

around 18° at night · days with rain: 6

Weeks 3-4 · avg for September

23°

around 13° at night · rain chance 36%

Weeks 5-7 · avg for October

16°

around 7° at night · rain chance 59%

The 30 & 45-day outlook for Mississauga: the next 15 days are a numerical forecast updated daily - on average 24° by day and 18° at night. Further out we rely on multi-year climate averages: around 23° in September, and about 16° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Mississauga

Saturday5 September 2026

☀️22°clear sky

sunrise 06:47 · sunset 19:47 · night 19° · evening 21° · rain 0.48 mm · humidity 53% · wind 4 m/s · clouds 1%

Sunday6 September 2026

🌧️20°light rain

sunrise 06:48 · sunset 19:46 · night 17° · evening 19° · rain 0.29 mm · humidity 62% · wind 4 m/s · clouds 51%

Monday7 September 2026

🌤️24°scattered clouds

sunrise 06:49 · sunset 19:44 · night 18° · evening 22° · rain 0.33 mm · humidity 49% · wind 2 m/s · clouds 40%

Tuesday8 September 2026

☁️22°overcast clouds

sunrise 06:50 · sunset 19:42 · night 19° · evening 19° · rain 0.48 mm · humidity 50% · wind 2 m/s · clouds 100%

Wednesday9 September 2026

🌧️29°light rain

sunrise 06:51 · sunset 19:40 · night 19° · evening 24° · rain 0.15 mm · humidity 56% · wind 8 m/s · clouds 92%

Thursday10 September 2026

☁️16°broken clouds

sunrise 06:52 · sunset 19:38 · night 12° · evening 15° · rain 4.17 mm · humidity 58% · wind 8 m/s · clouds 84%

Friday11 September 2026

☀️19°clear sky

sunrise 06:53 · sunset 19:37 · night 12° · evening 15° · rain 4.86 mm · humidity 37% · wind 3 m/s · clouds 43%

Saturday12 September 2026

🌤️22°scattered clouds

sunrise 06:54 · sunset 19:35 · night 16° · evening 18° · rain 2.19 mm · humidity 44% · wind 4 m/s · clouds 32%

Sunday13 September 2026

🌧️27°light rain

sunrise 06:55 · sunset 19:33 · night 24° · evening 24° · rain 0.81 mm · humidity 50% · wind 6 m/s · clouds 81%

Monday14 September 2026

🌧️33°light rain

sunrise 06:57 · sunset 19:31 · night 26° · evening 28° · rain 0.24 mm · humidity 48% · wind 4 m/s · clouds 66%

Tuesday15 September 2026

🌤️33°a few clouds

sunrise 06:58 · sunset 19:29 · night 26° · evening 28° · rain 4.02 mm · humidity 43% · wind 3 m/s · clouds 18%

Wednesday16 September 2026

🌧️33°light rain

sunrise 06:59 · sunset 19:27 · night 25° · evening 26° · rain 0.75 mm · humidity 43% · wind 4 m/s · clouds 5%

Thursday17 September 2026

🌧️33°light rain

sunrise 07:00 · sunset 19:26 · night 19° · evening 26° · rain 1.59 mm · humidity 45% · wind 6 m/s · clouds 56%

Friday18 September 2026

☁️13°overcast clouds

sunrise 07:01 · sunset 19:24 · night 9° · evening 11° · rain 23.91 mm · humidity 58% · wind 8 m/s · clouds 96%

Saturday19 September 2026

🌤️12°scattered clouds

sunrise 07:02 · sunset 19:22 · night 7° · evening 8° · humidity 35% · wind 5 m/s · clouds 36%

UV index in Mississauga - is it safe to sunbathe?

Today the UV index in Mississauga is 6 (moderate) - unprotected fair skin can burn in about 35 minutes. Seek shade around midday. SPF 30+, sunglasses and a hat for longer stays.

Mississauga weather through the year

Warmest, driest months on average: April, May, June, July.

Upcoming public holidays in Canada: Labour Day — 7 September · National Day for Truth and Reconciliation — 30 September · Thanksgiving — 12 October.

Nearby and related places

TorontoMarkhamMontrealOttawaGatineauQuebec CityCalgary

FAQ - Mississauga weather

What is the weather like in Mississauga today?

Today it is about 22° during the day and 19° at night, clear sky.

How far ahead can I check the forecast for Mississauga?

This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.