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SunnyDays

ERA5 almanac — 8 years of real data

Bryce Canyon in September

Bryce Canyon in September: 18% of days see measurable rain, 71°F average high, 32% of days historically clear (n=240, ERA5 2018–2025).

Bryce Canyon in September is historically a poor month for sun: only 32% of days clear across 8 years (n=240, avg high 71°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 Bryce Canyon 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 September

Clear-sky percentage for Bryce Canyon in September, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early September
1st–15th		 41% n=120 71°F
Late September
16th–end		 22% n=120 71°F
Full month average 32% n=240 71°F

Sunshine & warmth in September

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 Bryce Canyon in September. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early September
1st–15th		 60% n=120
Late September
16th–end		 26% n=120
Full month average 43% n=240
12.1 h median sunshine per day 98% of days exceed 8 h sunshine 18% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 32%. Sunshine-based “warm & sunny”: 43%. 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

Bryce Canyon is mostly overcast in September historically: only 32% of days are clear across 8 years (n=240), avg high 71°F. Most visitors this month will see more clouds than sun.

Every month in Bryce Canyon

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

Historical clear-sky % for Bryce Canyon, 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 0% n=240 All destinations →
May 8% n=248 All destinations →
June 50% n=240 All destinations →
July 46% n=248 All destinations →
August 44% n=248 All destinations →
September ← this page 32% 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 Bryce Canyon in September?

Rarely. Only 18% of days in Bryce Canyon see measurable rain in September, based on 8 years of ERA5 historical data (n=240 days, 2018–2025). This is a historical average, not a forecast.

Is Bryce Canyon good for sun in September?

It's mixed. Bryce Canyon in September is clear on 32% of days historically (avg high 71°F, n=240 days, ERA5 2018–2025) — the outcome varies year to year.

How Bryce Canyon compares in September

Head-to-head clear-sky comparisons against destinations travelers plausibly weigh against Bryce Canyon 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.