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SunnyDays

ERA5 almanac — 8 years of real data

Coeur d'Alene in May

Coeur d'Alene in May: 33% of days see measurable rain, 68°F average high, 20% of days historically clear (n=248, ERA5 2018–2025).

Coeur d'Alene in May is historically a poor month for sun: only 20% of days clear across 8 years (n=248, avg high 68°F). July is the clearest month for Coeur d'Alene historically. 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 Coeur d'Alene 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 May

Clear-sky percentage for Coeur d'Alene in May, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early May
1st–15th		 22% n=120 68°F
Late May
16th–end		 19% n=128 68°F
Full month average 20% n=248 68°F

Sunshine & warmth in May

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 Coeur d'Alene in May. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early May
1st–15th		 29% n=120
Late May
16th–end		 33% n=128
Full month average 31% n=248
13.2 h median sunshine per day 81% of days exceed 8 h sunshine 33% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 20%. Sunshine-based “warm & sunny”: 31%. The 11-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

Coeur d'Alene is mostly overcast in May historically: only 20% of days are clear across 8 years (n=248), avg high 68°F. If you want sun in Coeur d'Alene, July is historically much better. Most visitors this month will see more clouds than sun.

→ See all destinations in July — historically the best month for sun in Coeur d'Alene.

Every month in Coeur d'Alene

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

Historical clear-sky % for Coeur d'Alene, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 0% n=248 All destinations →
February 0% n=226 All destinations →
March 1% n=248 All destinations →
April 2% n=240 All destinations →
May ← this page 20% n=248 All destinations →
June 44% n=240 All destinations →
July 82% n=248 All destinations →
August 75% n=248 All destinations →
September 50% n=240 All destinations →
October 10% n=248 All destinations →
November 0% n=240 All destinations →
December 0% n=248 All destinations →

Frequently asked

Does it rain in Coeur d'Alene in May?

Sometimes. Coeur d'Alene sees measurable rain on 33% of days in May historically (n=248 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Coeur d'Alene good for sun in May?

Not usually. Coeur d'Alene is historically overcast in May: only 20% of days are clear (avg high 68°F, n=248 days, ERA5 2018–2025). July is historically far better for sun here.

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.