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SunnyDays

ERA5 almanac — 8 years of real data

Montréal in July

Montréal in July: 42% of days see measurable rain, 81°F average high, 35% of days historically clear (n=248, ERA5 2018–2025).

Montréal in July is historically a poor month for sun: only 35% of days clear across 8 years (n=248, avg high 81°F). Historical average, not a forecast.

What you are reading: 8-year historical averages from the ERA5 reanalysis, not a forecast. A month that is historically 90% clear can still be overcast on your specific trip. For this week’s actual forecast, see the live Montréal page. Both can be true at once: “historically strong in this month; this particular week is not.” We label which is which.

Early vs. Late July

Clear-sky percentage for Montréal in July, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early July
1st–15th		 37% n=120 81°F
Late July
16th–end		 34% n=128 81°F
Full month average 35% n=248 81°F

Sunshine & warmth in July

A second measure using actual sunshine hours (ERA5 sunshine_duration), not the daily weather code. A Lowcountry day with 12 hours of sun and a 25-minute afternoon storm is counted below as a warm, sunny day — because it was. How we define this.

Sunshine-based metrics for Montréal in July. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early July
1st–15th		 93% n=120
Late July
16th–end		 91% n=128
Full month average 92% n=248
13.2 h median sunshine per day 88% of days exceed 8 h sunshine 42% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 35%. Sunshine-based “warm & sunny”: 92%. The 57-point gap is from brief afternoon convective storms that stamp the whole day as “rain” in the WMO code but leave the bulk of the sunshine untouched.

Bottom line

Montréal is mostly overcast in July historically: only 35% of days are clear across 8 years (n=248), avg high 81°F. Most visitors this month will see more clouds than sun.

Every month in Montréal

Compare across all months with data. Numbers are historical clear-sky %.

Historical clear-sky % for Montréal, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 0% n=248 All destinations →
February 0% n=226 All destinations →
March 0% n=248 All destinations →
April 2% n=240 All destinations →
May 17% n=248 All destinations →
June 31% n=240 All destinations →
July ← this page 35% n=248 All destinations →
August 31% n=248 All destinations →
September 22% n=240 All destinations →
October 4% n=248 All destinations →
November 0% n=240 All destinations →
December 0% n=248 All destinations →

Frequently asked

Does it rain in Montréal in July?

Sometimes. Montréal sees measurable rain on 42% of days in July historically (n=248 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Montréal good for sun in July?

It's mixed. Montréal in July is clear on 35% of days historically (avg high 81°F, n=248 days, ERA5 2018–2025) — the outcome varies year to year.

How Montréal compares in July

Head-to-head clear-sky comparisons against destinations travelers plausibly weigh against Montréal this month — same passport tier, similar flight distance, both sides from the same 8-year ERA5 record.

All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.