Hottest (avg)
#1 / 12
The warmest month of the year.
August in context
How it compares to the rest of the year in San Diego.
Wettest (avg)
#10 / 12
One of the drier months.
Daylight Hours
#4 / 12
Around the yearly average.
Windiest (avg)
#7 / 12
Close to the yearly wind average.
Highest UV
#4 / 12
Near the middle of the yearly UV range.
Most Humid
#1 / 12
The muggiest month of the year.
Monthly climate breakdown
A detailed look at the typical climate conditions for August.
Thermal profile
Temperature
Typical daytime high
- Nighttime low
-
- Feels like (avg)
-
Light window
Sunshine
13.3 h
Average daylight
- UV index (max)
- 8
- Typical sun hours
- 05:12 - 18:31
Wet-day pattern
Rain & Snow
Typical rainfall
- Rainy days
- 1 days
- Cloud cover (avg)
- 25%
Air feel
Humidity & Wind
78%
Average humidity
- Wind (avg)
-
- Wind (max gusts)
-
Historical daily baseline
Daily climate explorer
Pick a day to inspect the usual conditions through August in San Diego. Based on a 30-year historical climate baseline, not a forecast.
Primary control
Select a day
Scroll to compare daily conditions. The summary updates with your selection.
Secondary context
Monthly trend
Median daytime highs across the month, with a softer low line.
Median temperatureMedian lowTypical range
Day 15 selected for August. Temperature 25.3°C.
Historical disruption baseline
Typical disruptions in August
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in August.
Heat Moderate
Hot feels-like days Measures: Hot feels-like days (>=32C). Observed about 5% of days (1.5 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.5 days / month
- Share of days
- ~5% of days
- Upper edge
- Up to ~35°C (P95)
Why this matters
Feels-like heat >=32C is possible on ~2 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Humidity Moderate
Muggy days Measures: Muggy days (dew point >=20C). Observed about 2% of days (0.7 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.7 days / month
- Share of days
- ~2% of days
- Upper edge
- Up to ~21°C (P95)
Why this matters
Muggy conditions are possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat Minor
Hot days Measures: Hot days (>=30C). Observed about 3% of days (0.8 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.8 days / month
- Share of days
- ~3% of days
- Upper edge
- Up to ~33°C (P95)
Why this matters
Hot days are possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Show all disruptions (12 more)
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 40% of days (12.4 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
12.4 days / month
- Share of days
- ~40% of days
- Upper edge
- Up to ~85% (P95)
Why this matters
High humidity is possible on ~12 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Humidity Minor
Humid days Measures: Humid days (dew point >=18C). Observed about 32% of days (9.8 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
9.8 days / month
- Share of days
- ~32% of days
- Upper edge
- Up to ~20°C (P95)
Why this matters
Humid conditions are possible on ~10 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 7% of days (2.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.2 days / month
- Share of days
- ~7% of days
- Upper edge
- Up to ~5.7mm (P95)
Why this matters
Measurable rain is possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 7% of days (2.1 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.1 days / month
- Share of days
- ~7% of days
- Upper edge
- Up to ~98% (P95)
Why this matters
Cloudy skies are possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 4% of days (1.1 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.1 days / month
- Share of days
- ~4% of days
- Upper edge
- Up to ~45km/h (P95)
Why this matters
Gusty conditions are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 2% of days (0.7 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.7 days / month
- Share of days
- ~2% of days
- Upper edge
- Up to ~99% (P95)
Why this matters
Mostly cloudy skies are possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat Minor
Warm nights Measures: Warm nights (min >=22C). Observed about 2% of days (0.6 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.6 days / month
- Share of days
- ~2% of days
- Upper edge
- Up to ~24°C (P95)
Why this matters
Warm nights are possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 2% of days (0.5 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.5 days / month
- Share of days
- ~2% of days
- Upper edge
- Up to ~13h (P95)
Why this matters
Several rainy hours are possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 1% of days (0.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.3 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~19h (P95)
Why this matters
Wet-most-of-day conditions are possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cloud Minor
Overcast days Measures: Overcast days (cloud cover >=95%). Observed about 1% of days (0.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.2 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~100% (P95)
Why this matters
Overcast skies are possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat Minor
Feels-like heatwave Measures: Feels-like heatwave runs (>=3 days). Observed about 0.2 days/month in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.2 days / month
- Share of days
- —
- Upper edge
- Up to ~34°C (P95)
Why this matters
Feels-like heatwave runs are possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat Minor
Heatwave run Measures: Heatwave runs (>=3 hot days). Observed about 0.1 days/month in August. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.1 days / month
- Share of days
- —
- Upper edge
- Up to ~32°C (P95)
Why this matters
Heatwave runs are possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Travel planning FAQ
Frequently asked questions
Quick answers to the weather questions you ask the most.
Is August a good time to visit San Diego?
Typical August days in San Diego reach highs of 25°C (77°F) with nights around 18°C (64°F). It usually feels warm by day and mild after dark. It is one of the drier months, which suits outdoor exploring and sightseeing.
What are temperatures like in August?
In August, you can usually expect highs of 25°C (77°F) and lows near 18°C (64°F). That means warm days and mild nights, so pack layers you can add or remove.
How much does it rain in August?
Rainfall in August averages 3 mm (0.12 in) across roughly 1 days. Overall it is a mostly dry time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in August?
You can expect about 13 hours of daylight in August. Sunrise is typically around 05:12 and sunset near 18:31. You get long days with comfortable amounts of daylight.
How strong is the sun in August?
UV levels frequently reach very high levels (around 8), so strong sun protection is essential, especially around midday.
Is it windy in August?
In August, average wind speeds are around 9 km/h (6 mph), with gusts on the windiest days reaching about 37 km/h (23 mph). On the ground, it is a gentle to moderate breeze is common, but stronger winds are not frequent.