Rule Morning Frost

Morning Frost Forecast for Miyajima, Japan

Miyajima, Hiroshima, Japan

Miyajima's Itsukushima torii stands offshore at high tide, framed by the shrine's covered walkways, wooded hills, and changing shoreline.

Currently

Real-time conditions

Frost Probability

Soil Temperature25.3°C

Dew Point21.3°C (high dew point)

Wind Speed1.5m/s (calm conditions)

Cloud Cover95%

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Tokyo

No opportunities in the next 14 days

See which requirements block the most forecast hours below.

Most common blockers (95-hour forecast)

Time Window100% of hours
Frost Probability100% of hours
Wind Speed44% of hours

How this forecast is evaluated

See which weather signals PhotoWeather uses to identify Morning Frost conditions across Japan. The requirements and hourly values below show how those signals apply at Miyajima.

Explore Morning Frost conditions across Japan →

Recorded match history

Completed PhotoWeather forecast matches recorded for this exact rule at Miyajima during the last 365 days.

Last 30 days

recorded matching windows

Last 90 days

recorded matching windows

Last 365 days

recorded matching windows · 76% average confidence

Only 2 completed matches are recorded in the last 365 days—insufficient history to identify a reliable typical start time or month.

These figures use completed PhotoWeather MatchEvent records from the previous 365 days only. They describe recorded forecast matches, not observations, climatological probability, or a guarantee of future conditions.

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95-hour requirements breakdown

When available, the detailed table below covers only the stated 95-hour horizon (typically 72–168 hours, depending on available hourly data). Opportunity records above span the next 14 days, so this table does not explain that entire 14-day period.

What passed or failed, hour by hour

0matching hours in the next 95 hours

AND logic: all conditions required

Meets requirement

Misses requirement

Time Asia/Tokyo	Time Window Sunrise -45m to +90m	Frost Probability ≥ 60.0%	Wind Speed ≤ 1.5m/s
Sat, Aug 22
04:00	✕	0%	1.5m/s
05:00	✕	0%	1.5m/s
06:00	✕	0%	1.3m/s
07:00	✕	0%	1.1m/s
08:00	✕	0%	0.35m/s
09:00	✕	0%	0.67m/s
10:00	✕	0%	1.7m/s
11:00	✕	0%	2.4m/s
12:00	✕	0%	2.6m/s
13:00	✕	0%	2.4m/s
14:00	✕	0%	2m/s
15:00	✕	0%	2m/s
16:00	✕	0%	2.5m/s
17:00	✕	0%	2.3m/s
18:00	✕	0%	1.6m/s
19:00	✕	0%	0.71m/s
20:00	✕	0%	0.5m/s
21:00	✕	0%	0.98m/s
22:00	✕	0%	1m/s
23:00	✕	0%	1.3m/s
Sun, Aug 23
24:00	✕	0%	1.3m/s
01:00	✕	0%	1.7m/s
02:00	✕	0%	1.6m/s
03:00	✕	0%	1.6m/s
04:00	✕	0%	1.6m/s
05:00	✕	0%	1.5m/s
06:00	✕	0%	1.4m/s
07:00	✕	0%	1.1m/s
08:00	✕	0%	0.55m/s
09:00	✕	0%	0.96m/s
10:00	✕	0%	1.8m/s
11:00	✕	0%	2.5m/s
12:00	✕	0%	2.7m/s
13:00	✕	0%	2.9m/s
14:00	✕	0%	2.6m/s
15:00	✕	0%	2m/s
16:00	✕	0%	2.1m/s
17:00	✕	0%	2.6m/s
18:00	✕	0%	1.8m/s
19:00	✕	0%	0.88m/s
20:00	✕	0%	1.1m/s
21:00	✕	0%	1.4m/s
22:00	✕	0%	1.5m/s
23:00	✕	0%	1.9m/s
Mon, Aug 24
24:00	✕	0%	2.2m/s
01:00	✕	0%	2.1m/s
02:00	✕	0%	1.9m/s
03:00	✕	0%	1.7m/s
04:00	✕	0%	1.5m/s
05:00	✕	0%	1.3m/s
06:00	✕	0%	1.3m/s
07:00	✕	0%	0.78m/s
08:00	✕	0%	0.56m/s
09:00	✕	0%	1.4m/s
10:00	✕	0%	2.2m/s
11:00	✕	0%	2.7m/s
12:00	✕	0%	3.2m/s
13:00	✕	0%	3.2m/s
14:00	✕	0%	2.9m/s
15:00	✕	0%	2.6m/s
16:00	✕	0%	2.8m/s
17:00	✕	0%	3m/s
18:00	✕	0%	1.8m/s
19:00	✕	0%	1.2m/s
20:00	✕	0%	0.82m/s
21:00	✕	0%	1.4m/s
22:00	✕	0%	1.2m/s
23:00	✕	0%	1.5m/s
Tue, Aug 25
24:00	✕	0%	1.2m/s
01:00	✕	0%	1.1m/s
02:00	✕	0%	1.4m/s
03:00	✕	0%	1.4m/s
04:00	✕	0%	1.5m/s
05:00	✕	0%	1.7m/s
06:00	✕	0%	0.32m/s
07:00	✕	0%	0.16m/s
08:00	✕	0%	0.6m/s
09:00	✕	0%	1.4m/s
10:00	✕	0%	1.6m/s
11:00	✕	0%	1.8m/s
12:00	✕	0%	2m/s
13:00	✕	0%	1.5m/s
14:00	✕	0%	1.1m/s
15:00	✕	0%	0.73m/s
16:00	✕	0%	0.7m/s
17:00	✕	0%	0.68m/s
18:00	✕	0%	0.65m/s
19:00	✕	0%	0.52m/s
20:00	✕	0%	0.39m/s
21:00	✕	0%	0.25m/s
22:00	✕	0%	0.46m/s
23:00	✕	0%	0.66m/s
Wed, Aug 26
24:00	✕	0%	0.86m/s
01:00	✕	0%	1m/s
02:00	✕	0%	1.2m/s

How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Frost Probability mean?

Inputs that drive the score

This derived score summarizes multiple raw weather signals. The table below shows the supporting inputs hour by hour, so you can see what's pushing the score up or down.

Time Asia/Tokyo	Dew Point °C	Surface Temperature °C	Temperature °C	Time Window	Total Cloud Coverage %	Vapor Pressure Deficit kPa
Sun, Aug 23 Sunrise 05:36 Sunset 18:50
05:00 ☾	21°C	25°C	24°C	-	95%	0.49kPa
06:00 ☾	21°C	25°C	24°C	-	24%	0.48kPa
07:00 ☾	22°C	25°C	25°C	-	4%	0.65kPa
08:00 ☾	22°C	25°C	27°C	-	10%	0.93kPa
09:00	22°C	25°C	28°C	-	5%	1.2kPa
10:00	22°C	26°C	29°C	-	4%	1.3kPa
11:00	22°C	26°C	29°C	-	4%	1.4kPa
12:00	22°C	26°C	29°C	-	3%	1.4kPa
13:00	22°C	27°C	30°C	-	6%	1.4kPa
14:00	23°C	27°C	29°C	-	5%	1.4kPa
15:00	23°C	27°C	30°C	-	1%	1.5kPa
16:00	23°C	27°C	30°C	-	4%	1.5kPa
17:00	23°C	27°C	29°C	-	57%	1.3kPa
18:00	23°C	27°C	28°C	-	99%	0.94kPa
19:00 ☾	23°C	27°C	27°C	-	100%	0.73kPa
20:00 ☾	23°C	27°C	26°C	-	99%	0.66kPa
21:00 ☾	22°C	27°C	26°C	-	21%	0.61kPa
22:00 ☾	22°C	27°C	26°C	-	4%	0.59kPa
23:00 ☾	22°C	26°C	25°C	-	0%	0.56kPa
Mon, Aug 24 Sunrise 05:37 Sunset 18:48
24:00 ☾	22°C	26°C	25°C	-	0%	0.5kPa
01:00 ☾	22°C	26°C	24°C	-	0%	0.42kPa
02:00 ☾	22°C	26°C	24°C	-	1%	0.37kPa
03:00 ☾	22°C	26°C	24°C	-	2%	0.33kPa
04:00 ☾	22°C	26°C	24°C	-	2%	0.31kPa
05:00 ☾	22°C	25°C	24°C	-	3%	0.29kPa
06:00 ☾	22°C	25°C	24°C	-	2%	0.31kPa
07:00 ☾	22°C	25°C	25°C	-	4%	0.53kPa
08:00 ☾	22°C	25°C	27°C	-	2%	0.82kPa
09:00	23°C	25°C	28°C	-	0%	1.1kPa
10:00	23°C	26°C	29°C	-	0%	1.1kPa
11:00	23°C	26°C	29°C	-	7%	1.1kPa
12:00	23°C	26°C	29°C	-	16%	1.1kPa
13:00	24°C	27°C	29°C	-	11%	1.1kPa
14:00	24°C	27°C	29°C	-	10%	1.2kPa
15:00	23°C	27°C	30°C	-	8%	1.5kPa
16:00	23°C	27°C	30°C	-	46%	1.5kPa
17:00	23°C	27°C	30°C	-	17%	1.3kPa
18:00	24°C	27°C	28°C	-	5%	0.96kPa
19:00 ☾	23°C	27°C	27°C	-	5%	0.68kPa
20:00 ☾	23°C	27°C	26°C	-	5%	0.56kPa
21:00 ☾	23°C	27°C	26°C	-	92%	0.47kPa
22:00 ☾	23°C	27°C	25°C	-	93%	0.45kPa
23:00 ☾	23°C	27°C	25°C	-	82%	0.42kPa
Tue, Aug 25 Sunrise 05:38 Sunset 18:47
24:00 ☾	23°C	26°C	25°C	-	14%	0.42kPa
01:00 ☾	22°C	26°C	25°C	-	72%	0.4kPa
02:00 ☾	22°C	26°C	24°C	-	5%	0.38kPa
03:00 ☾	22°C	26°C	24°C	-	5%	0.34kPa
04:00 ☾	22°C	25°C	24°C	-	0%	0.33kPa
05:00 ☾	22°C	25°C	24°C	-	5%	0.34kPa
06:00 ☾	22°C	25°C	24°C	-	1%	0.34kPa
07:00 ☾	23°C	25°C	25°C	-	0%	0.48kPa
08:00 ☾	23°C	25°C	27°C	-	2%	0.68kPa
09:00	23°C	25°C	28°C	-	1%	0.92kPa
10:00	23°C	26°C	28°C	-	1%	1kPa
11:00	22°C	27°C	28°C	-	0%	1.1kPa
12:00	22°C	28°C	29°C	-	0%	1.2kPa
13:00	22°C	28°C	27°C	-	33%	0.85kPa
14:00	22°C	28°C	25°C	-	67%	0.55kPa
15:00	22°C	28°C	24°C	-	100%	0.28kPa
16:00	22°C	27°C	24°C	-	100%	0.28kPa
17:00	22°C	27°C	24°C	-	100%	0.28kPa
18:00	22°C	27°C	24°C	-	100%	0.28kPa
19:00 ☾	22°C	26°C	23°C	-	100%	0.25kPa
20:00 ☾	22°C	26°C	23°C	-	100%	0.22kPa
21:00 ☾	22°C	26°C	23°C	-	100%	0.2kPa
22:00 ☾	22°C	26°C	23°C	-	100%	0.19kPa
23:00 ☾	22°C	25°C	23°C	-	100%	0.18kPa
Wed, Aug 26 Sunrise 05:38 Sunset 18:46
24:00 ☾	22°C	25°C	23°C	-	100%	0.17kPa
01:00 ☾	22°C	25°C	25°C	-	100%	0.46kPa
02:00 ☾	22°C	25°C	27°C	-	100%	0.82kPa
03:00 ☾	22°C	25°C	29°C	-	100%	1.3kPa
04:00 ☾	22°C	26°C	30°C	-	81%	1.5kPa

How to read: these inputs help produce the derived score; they are not requirements by themselves.

How this forecast is made

Opportunities are threshold-based signals: PhotoWeather checks whether forecast conditions match the rules for a photography scenario. They are planning guidance, not guarantees. Forecasts can change as new model runs arrive, and confidence generally decreases farther into the forecast horizon, so recheck conditions before travelling.

The weather forecast foundation comes through Open-Meteo , which aggregates models from weather agencies. PhotoWeather applies condition-specific thresholds and derived calculations; not every condition uses every model or data input.

How opportunities work → Weather data sources →

Forecast generated

Aug 22, 2026, 7:01 PM UTC

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