Hottest (avg)
#7 / 12
Sits around the middle of the year.
April in context
How it compares to the rest of the year in San Francisco.
Wettest (avg)
#6 / 12
Typical rainfall for the year.
Daylight Hours
#5 / 12
Around the yearly average.
Windiest (avg)
#3 / 12
Among the windier months.
Highest UV
#5 / 12
Near the middle of the yearly UV range.
Most Humid
#9 / 12
Humidity stays close to the yearly norm.
Monthly climate breakdown
A detailed look at the typical climate conditions for April.
Thermal profile
Temperature
Typical daytime high
- Nighttime low
-
- Feels like (avg)
-
Light window
Sunshine
13.2 h
Average daylight
- UV index (max)
- 8
- Typical sun hours
- 05:33 - 18:45
Wet-day pattern
Rain & Snow
Typical rainfall
- Rainy days
- 6 days
- Cloud cover (avg)
- 46%
Air feel
Humidity & Wind
76%
Average humidity
- Wind (avg)
-
- Wind (max gusts)
-
Historical daily baseline
Daily climate explorer
Pick a day to inspect the usual conditions through April in San Francisco. 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 April. Temperature 14.9°C.
Historical disruption baseline
Typical disruptions in April
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in April.
Cold High impact
Cold feels-like nights Measures: Cold feels-like nights (min <=5C). Observed about 24% of days (7.3 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
7.3 days / month
- Share of days
- ~24% of days
- Upper edge
- Up to ~5°C (P95)
Why this matters
Cold feels-like nights are possible on ~7 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Rain High impact
Washout risk Measures: Washout day risk. Observed about 8% of days (2.4 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.4 days / month
- Share of days
- ~8% of days
- Upper edge
- Up to ~28mm (P95)
Why this matters
Washout conditions are possible on ~2 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Strong gusts Measures: Strong gust days (>=60 km/h). Observed about 7% of days (2.0 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.0 days / month
- Share of days
- ~7% of days
- Upper edge
- Up to ~76km/h (P95)
Why this matters
Strong gusts are possible on ~2 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Wind High impact
Stormy conditions Measures: Storm-impact proxy days. Observed about 2% of days (0.7 days/month) in April. 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 ~72km/h (P95)
Why this matters
Stormy conditions are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain Moderate
Rain disruption Measures: Likely rain disruption days. Observed about 8% of days (2.5 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.5 days / month
- Share of days
- ~8% of days
- Upper edge
- Up to ~27mm (P95)
Why this matters
Rain disruption risk appears on ~3 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Show all disruptions (15 more)
Rain High impact
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 4% of days (1.2 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.2 days / month
- Share of days
- ~4% of days
- Upper edge
- Up to ~34mm (P95)
Why this matters
Heavy rain is possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain High impact
Washout run Measures: Multi-day washout runs. Observed about 0.5 days/month in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.5 days / month
- Share of days
- —
- Upper edge
- Up to ~30mm (P95)
Why this matters
Multi-day washout runs are possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain High impact
Very heavy rain Measures: Very heavy rain days (>=25mm). Observed about 1% of days (0.2 days/month) in April. 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 ~37mm (P95)
Why this matters
Very heavy rain is possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 62% of days (18.7 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
18.7 days / month
- Share of days
- ~62% of days
- Upper edge
- Up to ~64km/h (P95)
Why this matters
Gusty conditions are possible on ~19 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 40% of days (11.9 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
11.9 days / month
- Share of days
- ~40% of days
- Upper edge
- Up to ~90% (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.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 36% of days (10.9 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
10.9 days / month
- Share of days
- ~36% of days
- Upper edge
- Up to ~99% (P95)
Why this matters
Cloudy skies are possible on ~11 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 27% of days (8.1 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
8.1 days / month
- Share of days
- ~27% of days
- Upper edge
- Up to ~16mm (P95)
Why this matters
Measurable rain is possible on ~8 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 20% of days (6.0 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
6.0 days / month
- Share of days
- ~20% of days
- Upper edge
- Up to ~19h (P95)
Why this matters
Several rainy hours are possible on ~6 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 19% of days (5.6 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
5.6 days / month
- Share of days
- ~19% of days
- Upper edge
- Up to ~100% (P95)
Why this matters
Mostly cloudy skies are possible on ~6 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 14% of days (4.3 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
4.3 days / month
- Share of days
- ~14% of days
- Upper edge
- Up to ~21h (P95)
Why this matters
Wet-most-of-day conditions are possible on ~4 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 6% of days (1.8 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.8 days / month
- Share of days
- ~6% of days
- Upper edge
- Up to ~100% (P95)
Why this matters
Overcast skies are possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Wind Minor
Breezy days Measures: Breezy days (mean wind >=25 km/h). Observed about 3% of days (1.0 days/month) in April. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.0 days / month
- Share of days
- ~3% of days
- Upper edge
- Up to ~33km/h (P95)
Why this matters
Breezy conditions are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cold Minor
Cold nights Measures: Cold nights (min <=5C). Observed about 2% of days (0.6 days/month) in April. 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 ~5°C (P95)
Why this matters
Cold nights are possible on ~1 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Visibility Minor
Fog-likely signal Measures: Fog-likely visibility proxy. Observed about 1% of days (0.2 days/month) in April. 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 ~95% (P95)
Why this matters
Fog-likely conditions are possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Other Minor
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data Measures: Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data. Observed about 1% of days (0.2 days/month) in April. 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 ~95 (P95)
Why this matters
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data is possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Travel planning FAQ
Frequently asked questions
Quick answers to the weather questions you ask the most.
Is April a good time to visit San Francisco?
Typical April days in San Francisco reach highs of 17°C (63°F) with nights around 9°C (48°F). It usually feels mild by day and cool after dark. Overall, April sits in the middle of the San Francisco climate range.
What are temperatures like in April?
Daytime temperatures in April typically peak near 17°C (63°F), while nights drop to around 9°C (48°F). Expect mild afternoons and cool evenings.
How much does it rain in April?
Rainfall in April averages 41 mm (1.6 in) across roughly 6 days. Overall it is a moderately wet time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in April?
You can expect about 13 hours of daylight in April. Sunrise is typically around 05:33 and sunset near 18:45. You get long days with comfortable amounts of daylight.
How strong is the sun in April?
UV levels are often high (around 8). Regular sunscreen and a hat are recommended.
Is it windy in April?
In April, average wind speeds are around 17 km/h (11 mph), with gusts on the windiest days reaching about 60 km/h (37 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.