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Weather in Alliston for May 2026

Your guide to Alliston weather in May - trends and predictions

    Temperatures

  • Until now, May 2026 in Alliston is cooler than usual, with temperatures averaging 10.9 °C, this is -2.9 °C below the typical seasonal average.

  • The forecast for the next days in Alliston predicts temperatures to be around 14 °C, close to the historical average.

  • In general, the average temperature in Alliston at the beginning of May is 13.6 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 18.9 °C by the end of May.

    • Rain 🌧️

  • Alliston in May brings notable rainfall, with an average of 19 rainy days and a total precipitation of 134.8 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
12
Dry days
Average rainy days
19
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/7°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Alliston Weather May

Move between months or click on a day
April
June
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Light rain
12°
2
Overcast
9°
3
Patchy rain possible
13°
4
Fog
18°
5
Light drizzle
15°
6
Sunny
15°
7
Overcast
13°
8
Patchy rain possible
14°
9
Light rain shower
15°
10
Patchy rain possible
12°
11
Sunny
12°
12
Patchy rain possible
14°
13
Patchy rain possible
10°
14
Patchy rain possible
7°
15
Patchy rain possible
13°
16
Sunny
14°
17
Patchy rain possible
19°
18
Overcast
13°
19
Moderate rain
10°
20
Patchy rain possible
14°
21
Partly cloudy
17°
22
Patchy rain possible
16°
23
Partly cloudy
16°
24
Patchy rain possible
16°
25
Sunny
15°
26
Mist
20°
27
Sunny
21°
28
Cloudy
18°
29
Sunny
18°
30
Partly cloudy
21°
31
Partly cloudy
19°

Temperatures trend during May in Alliston

See the weather trend as well as the moving average line

May weather in Alliston day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
1 May Light rain
Light rain
 12° /2° 13.2 mm 4
2 May Overcast
Overcast
 9° /3° 0.1 mm 4
3 May Patchy rain possible
Patchy rain possible
 13° /2° 1.5 mm 4
4 May Fog
Fog
 18° /6° 0.8 mm 5
5 May Light drizzle
Light drizzle
 15° /7° 1 mm 4
6 May Sunny
Sunny
 15° /6° 5.2 mm 5
7 May Overcast
Overcast
 13° /3° 7.1 mm 5
8 May Patchy rain possible
Patchy rain possible
 14° /3° 1.4 mm 5
9 May Light rain shower
Light rain shower
 15° /3° 1.7 mm 5
10 May Patchy rain possible
Patchy rain possible
 12° /3° 0.2 mm 4
11 May Sunny
Sunny
 12° /1° 0 mm 5.9
12 May Patchy rain possible
Patchy rain possible
 14° /0° 2.5 mm 6.4
13 May Patchy rain possible
Patchy rain possible
 10° /4° 4.7 mm 3.2
14 May Patchy rain possible
Patchy rain possible
 7° /3° 0.6 mm 1
15 May Patchy rain possible
Patchy rain possible
 13° /2° 4 mm 0.7
16 May Sunny
Sunny
 14° /1° 0 mm 3
17 May Patchy rain possible
Patchy rain possible
 19° /6° 1.9 mm 3
18 May Overcast
Overcast
 13° /7° 0 mm 2
19 May Moderate rain
Moderate rain
 10° /7° 11.8 mm 2
20 May Patchy rain possible
Patchy rain possible
 14° /8° 5 mm 3
21 May Partly cloudy
Partly cloudy
 17° /7° 0 mm 4
22 May Patchy rain possible
Patchy rain possible
 16° /7° 0.5 mm 3
23 May Partly cloudy
Partly cloudy
 16° /4° 0 mm 4
24 May Patchy rain possible
Patchy rain possible
 16° /10° 0.8 mm 3
25 May Sunny
Sunny
 15° /5° 1.2 mm 4
26 May Mist
Mist
 20° /5° 0 mm 5
27 May Sunny
Sunny
 21° /7° 1.5 mm 5
28 May Cloudy
Cloudy
 18° /9° 2 mm 4
29 May Sunny
Sunny
 18° /8° 7 mm 5
30 May Partly cloudy
Partly cloudy
 21° /8° 0 mm 5
31 May Partly cloudy
Partly cloudy
 19° /8° 2.8 mm 5
Next
Important Notice
Our weather forecast for Alliston in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Alliston forecast closer to your planned date for the most up-to-date weather information.
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Alliston in May - FAQ

What are the expected maximum and minimum temperatures in Alliston during May?

Enjoy moderate daytime temperatures of up to 17° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Alliston during May?

Significant rainfall exceeding 134.8 mm is expected in Alliston during May, occurring over more than 19 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Alliston during May?

The average wind speed in Alliston during May is 19 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Alliston

Explore the daily rainfall trends and prepare for Allistons May weather 💧
Typically, Alliston has 19 rainy days in May with a total of 134.8 mm of rainfall.

UV exposure in Alliston during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️

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Location coordinates Where is Alliston?

Get accurate weather forecasts for Alliston, located at latitude 44.15 and longitude -79.866. Stay updated with localized weather information tailored for Alliston.

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