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SunnyDays

ERA5 almanac — 8 years of real data

Bali in August

Bali in August: 72% of days see measurable rain, 75°F average high, 10% of days historically clear (n=248, ERA5 2018–2025).

Bali in August is historically a poor month for sun: only 10% of days clear across 8 years (n=248, avg high 75°F). May is the clearest month for Bali 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 Bali 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 August

Clear-sky percentage for Bali in August, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early August
1st–15th		 12% n=120 75°F
Late August
16th–end		 9% n=128 75°F
Full month average 10% n=248 75°F

Sunshine & warmth in August

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 Bali in August. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early August
1st–15th		 88% n=120
Late August
16th–end		 91% n=128
Full month average 90% n=248
10.8 h median sunshine per day 89% of days exceed 8 h sunshine 72% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 10%. Sunshine-based “warm & sunny”: 90%. The 80-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

Bali is a poor choice for sun in August: just 10% of days clear historically (n=248). May is the historically strongest month for sun here. The 8-year record is consistent — this is not a fluke bad stretch.

→ See all destinations in May — historically the best month for sun in Bali.

Every month in Bali

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

Historical clear-sky % for Bali, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 3% n=248 All destinations →
February 1% n=226 All destinations →
March 0% n=248 All destinations →
April 8% n=240 All destinations →
May 10% n=248 All destinations →
June 6% n=240 All destinations →
July 5% n=248 All destinations →
August ← this page 10% n=248 All destinations →
September 9% n=240 All destinations →
October 8% n=248 All destinations →
November 2% n=240 All destinations →
December 2% n=248 All destinations →

Frequently asked

Does it rain in Bali in August?

Yes, frequently. In Bali, 72% of days in August see measurable rain, based on 8 years of ERA5 historical data (n=248 days, 2018–2025). This is a historical average, not a forecast.

Is Bali good for sun in August?

Not usually. Bali is historically overcast in August: only 10% of days are clear (avg high 75°F, n=248 days, ERA5 2018–2025). May 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.