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SunnyDays

ERA5 almanac — 8 years of real data

Austin in July

Austin in July is a mixed month for sun: 47% of days historically clear (n=248, avg high 95°F). The outcome varies year to year — check the early/late split below. 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 Austin 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 Austin 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		 41% n=120 95°F
Late July
16th–end		 52% n=128 95°F
Full month average 47% n=248 95°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 Austin 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		 94% n=120
Late July
16th–end		 98% n=128
Full month average 96% n=248
12.3 h median sunshine per day 93% of days exceed 8 h sunshine 31% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 47%. Sunshine-based “warm & sunny”: 96%. The 49-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

Austin in July is genuinely mixed: 47% of days historically clear (n=248), avg high 95°F — roughly even odds. The outcome varies year to year; don't book if you need guaranteed sun.

Every month in Austin

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

Historical clear-sky % for Austin, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 4% n=248 All destinations →
February 15% n=226 All destinations →
March 26% n=248 All destinations →
April 35% n=240 All destinations →
May 27% n=248 All destinations →
June 32% n=240 All destinations →
July ← this page 47% n=248 All destinations →
August 46% n=248 All destinations →
September 41% n=240 All destinations →
October 48% n=248 All destinations →
November 25% n=240 All destinations →
December 11% n=248 All destinations →

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.