January in Castro — the year's strongest window
Best window · 9.4/10January averages 14°C (57°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Expect 18 mm of rain — occasional showers rather than washed-out days — alongside about 31 sunny days and 14.8 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Castro at 9.4/10 — the reference point every other month on this page is measured against.
Expect peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack layers you can shed by midday plus one warm layer for the evening.
February in Castro — the year's strongest window
Best window · 9.4/10February averages 14°C (57°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Expect 19 mm of rain — occasional showers rather than washed-out days — alongside about 25 sunny days and 13.7 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Castro at 9.4/10 — the reference point every other month on this page is measured against.
Expect peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack layers you can shed by midday plus one warm layer for the evening.
March in Castro — reliably good (6th best month)
Good · 7.3/10March averages 12°C (53°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 57 mm, so plan one flexible day in three; you still get about 11 sunny days and 12.3 hours of daylight.
It scores 7.3/10 here, 6th of 12 months, against 9.4/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
If your dates are flexible, January is materially better in Castro — 2.1 points higher on the same scale.
April in Castro — workable with trade-offs
Trade-offs · 5.4/10April averages 10°C (50°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 89 mm, so plan one flexible day in three; you still get about 2 sunny days and 10.8 hours of daylight.
It scores 5.4/10 here, 7th of 12 months, against 9.4/10 in the destination's best month.
Expect mid-season pricing, and crowds are light for this destination.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
If your dates are flexible, January is materially better in Castro — 4 points higher on the same scale.
May in Castro — workable with trade-offs
Trade-offs · 5.1/10May averages 8°C (46°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 71 mm, so plan one flexible day in three; you still get about 0 sunny days and 9.6 hours of daylight.
It scores 5.1/10 here, 9th of 12 months, against 9.4/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
If your dates are flexible, January is materially better in Castro — 4.3 points higher on the same scale.
June in Castro — the hardest end of the year
Hardest · 4.1/10June averages 7°C (45°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
At 108 mm this is a genuinely wet month: about 0 sunny days in total, and outdoor plans need an indoor fallback.
It scores 4.1/10 here, 11th of 12 months, against 9.4/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a proper rain shell rather than an umbrella.
If your dates are flexible, January is materially better in Castro — 5.3 points higher on the same scale.
July in Castro — the hardest end of the year
Hardest · 3.7/10July averages 6°C (43°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
At 123 mm this is a genuinely wet month: about 0 sunny days in total, and outdoor plans need an indoor fallback.
It scores 3.7/10 here, 12th of 12 months, against 9.4/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a proper rain shell rather than an umbrella.
If your dates are flexible, January is materially better in Castro — 5.7 points higher on the same scale.
August in Castro — the hardest end of the year
Hardest · 4.9/10August averages 7°C (44°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 74 mm, so plan one flexible day in three; you still get about 0 sunny days and 10.3 hours of daylight.
It scores 4.9/10 here, 10th of 12 months, against 9.4/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
If your dates are flexible, January is materially better in Castro — 4.5 points higher on the same scale.
September in Castro — workable with trade-offs
Trade-offs · 5.4/10September averages 7°C (45°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 88 mm, so plan one flexible day in three; you still get about 7 sunny days and 11.7 hours of daylight.
It scores 5.4/10 here, 8th of 12 months, against 9.4/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
If your dates are flexible, January is materially better in Castro — 4 points higher on the same scale.
October in Castro — reliably good (4th best month)
Good · 8.1/10October averages 9°C (48°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Expect 36 mm of rain — occasional showers rather than washed-out days — alongside about 21 sunny days and 13.2 daylight hours.
It scores 8.1/10 here, 4th of 12 months, against 9.4/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in.
November in Castro — reliably good (5th best month)
Good · 8.1/10November averages 11°C (51°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 54 mm, so plan one flexible day in three; you still get about 22 sunny days and 14.5 hours of daylight.
It scores 8.1/10 here, 5th of 12 months, against 9.4/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
December in Castro — the year's strongest window
Best window · 9.1/10December averages 12°C (54°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Expect 23 mm of rain — occasional showers rather than washed-out days — alongside about 31 sunny days and 15.1 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Castro at 9.1/10 — the reference point every other month on this page is measured against.
Expect peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack layers you can shed by midday plus one warm layer for the evening.
