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Climate chart St. Catharines

Jan.

max 37°F min 30°F

21

Feb.

max 36°F min 27°F

14

Mar.

max 39°F min 30°F

22

Apr.

max 50°F min 39°F

21

May.

max 63°F min 50°F

15

Jun.

max 72°F min 57°F

15

Jul.

max 79°F min 64°F

17

Aug.

max 79°F min 66°F

16

Sep.

max 72°F min 61°F

12

Oct.

max 59°F min 48°F

10

Nov.

max 48°F min 41°F

14

Dec.

max 36°F min 28°F

21

Weekly overview St. Catharines

Weather St. Catharines 14 days

Thursday 21-05-2026 Sunny/Clear 34°F / 57°F

Friday 22-05-2026 Sunny/Clear 39°F / 64°F

Saturday 23-05-2026 Partly cloudy 41°F / 59°F

Sunday 24-05-2026 Patchy rain possible 39°F / 64°F

Monday 25-05-2026 Patchy rain possible 48°F / 61°F

Tuesday 26-05-2026 Patchy rain possible 55°F / 61°F

Wednesday 27-05-2026 Patchy rain possible 63°F / 73°F

Thursday 28-05-2026 Patchy rain possible 50°F / 66°F

Friday 29-05-2026 Sunny/Clear 39°F / 61°F

Saturday 30-05-2026 Sunny/Clear 39°F / 63°F

Sunday 31-05-2026 Patchy rain possible 46°F / 61°F

Monday 01-06-2026 Patchy rain possible 48°F / 52°F

Tuesday 02-06-2026 Patchy rain possible 41°F / 57°F

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