March is one of the cooler months of the year in Sunnyvale, with average highs near 16.3°C and lows around 5.6°C (mean 11°C). It is a relatively wet time of year, averaging 87 mm of rainfall and 83% relative humidity across the period.
March is one of the cooler months of the year in Sunnyvale. Across 45 years of records, the warmest March in Sunnyvale was 2015 — when the month averaged 13.7°C — while the coldest was 2006 at 8°C. Typical March days reach 16.3°C with nights near 5.6°C. The long-term March temperature trend is broadly flat.
March is a relatively wet time of year in Sunnyvale, averaging 87 mm of rainfall. The wettest March on record was 1995 with 223 mm, while the driest was 1988 at 1 mm.
Relative humidity in Sunnyvale during March averages 83%. The most humid March was 1983 at 88%, and the least humid was 1988 at 71%.
March receives about 4.6 kWh/m²/day of solar energy in Sunnyvale. The sunniest March was 1988 at 5.3 kWh/m²/day, and the cloudiest was 2011 at 3.9.
Average wind speed in Sunnyvale during March is 1.9 m/s. The windiest March was 1991 at 2.6 m/s, while the calmest were 1993 and 2015 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.6°C | 10.9°C | 11.1°C | 11.3°C | 10.5°C | -0.1°C |
| Avg High | 15.9°C | 16.2°C | 16.7°C | 16.7°C | 15.7°C | -0.2°C |
| Avg Low | 5.4°C | 5.7°C | 5.5°C | 5.9°C | 5.3°C | -0.1°C |
| Avg Rain | 112 mm | 88 mm | 55 mm | 96 mm | 85 mm | -26 mm |
March temperatures in Sunnyvale have risen by about 0.6°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -1.5°C (1988) to a record high of 28.5°C (2007).
Rainfall in March is a relatively wet time of year, averaging 87 mm, with a wettest year of 223 mm.
A quieter season to visit Sunnyvale
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Sunnyvale. That said, March — with days averaging 16.3°C and nights around 5.6°C (mean 11°C) and higher rainfall (87 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 15.8°C | 11.0°C | 6.1°C | 28.0°C | 2.9°C | 64 mm | 84% | 2.2 m/s | 4.6 |
| 2024 | 15.4°C | 10.7°C | 6.1°C | 19.9°C | 4.4°C | 99 mm | 86% | 2 m/s | 4.6 |
| 2023 | 12.8°C | 8.5°C | 4.3°C | 17.8°C | 0.2°C | 217 mm | 87% | 2.2 m/s | 4.4 |
| 2022 | 17.7°C | 11.8°C | 5.9°C | 24.4°C | 2.9°C | 21 mm | 81% | 1.9 m/s | 5.1 |
| 2021 | 16.6°C | 10.3°C | 4.0°C | 27.6°C | 1.6°C | 43 mm | 74% | 2 m/s | 5.2 |
| 2020 | 15.9°C | 10.6°C | 5.4°C | 25.0°C | 1.4°C | 69 mm | 80% | 1.6 m/s | 4.3 |
| 2019 | 15.4°C | 10.6°C | 5.8°C | 22.6°C | 0.9°C | 108 mm | 84% | 1.8 m/s | 4.5 |
| 2018 | 15.9°C | 10.5°C | 5.2°C | 24.7°C | -1.3°C | 135 mm | 80% | 1.8 m/s | 4.5 |
| 2017 | 17.0°C | 11.9°C | 6.8°C | 25.7°C | 2.8°C | 76 mm | 85% | 1.7 m/s | 4.8 |
| 2016 | 16.7°C | 11.9°C | 7.0°C | 22.5°C | 3.6°C | 175 mm | 87% | 2.1 m/s | 4.3 |
| 2015 🔥 | 19.9°C | 13.7°C | 7.5°C | 26.5°C | 4.3°C | 7 mm | 81% | 1.5 m/s | 5 |
| 2014 | 19.4°C | 13.1°C | 6.8°C | 25.3°C | 2.5°C | 65 mm | 76% | 1.8 m/s | 4.6 |
| 2013 | 17.6°C | 11.6°C | 5.5°C | 24.7°C | 1.3°C | 26 mm | 81% | 1.7 m/s | 4.6 |
| 2012 | 15.5°C | 10.0°C | 4.6°C | 23.9°C | 0.0°C | 139 mm | 78% | 2.2 m/s | 4.1 |
| 2011 | 14.5°C | 9.9°C | 5.2°C | 23.3°C | 1.3°C | 171 mm | 88% | 2.1 m/s | 3.9 |
| 2010 | 15.5°C | 9.9°C | 4.4°C | 22.5°C | 1.2°C | 63 mm | 83% | 1.8 m/s | 4.8 |
| 2009 | 15.7°C | 10.4°C | 5.1°C | 22.7°C | 0.2°C | 69 mm | 83% | 2 m/s | 4.9 |
| 2008 | 16.2°C | 10.3°C | 4.3°C | 20.1°C | 1.1°C | 6 mm | 81% | 1.8 m/s | 5.2 |
| 2007 | 19.6°C | 12.8°C | 6.1°C | 28.5°C | 0.5°C | 10 mm | 77% | 1.7 m/s | 4.9 |
| 2006 ❄️ | 12.3°C | 8.0°C | 3.8°C | 17.8°C | 0.6°C | 148 mm | 86% | 2.1 m/s | 4.1 |
| 2005 | 17.1°C | 12.0°C | 6.9°C | 26.0°C | 2.7°C | 98 mm | 84% | 1.8 m/s | 4.4 |
| 2004 | 19.9°C | 13.6°C | 7.3°C | 25.3°C | 1.5°C | 15 mm | 80% | 1.7 m/s | 5 |
| 2003 | 17.1°C | 11.6°C | 6.1°C | 23.8°C | 3.9°C | 39 mm | 83% | 1.9 m/s | 5.1 |
| 2002 | 15.9°C | 10.1°C | 4.2°C | 23.7°C | -1.2°C | 64 mm | 81% | 1.9 m/s | 4.8 |
| 2001 | 17.7°C | 12.1°C | 6.5°C | 24.9°C | 2.1°C | 58 mm | 85% | 1.9 m/s | 4.6 |
| 2000 | 15.7°C | 10.2°C | 4.7°C | 21.4°C | 2.3°C | 43 mm | 84% | 2 m/s | 4.9 |
| 1999 | 13.4°C | 8.5°C | 3.7°C | 17.5°C | 0.6°C | 69 mm | 84% | 2 m/s | 4.6 |
| 1998 | 15.6°C | 10.9°C | 6.2°C | 21.1°C | 0.4°C | 84 mm | 85% | 1.7 m/s | 4.4 |
| 1997 | 17.9°C | 11.8°C | 5.6°C | 24.6°C | -0.1°C | 11 mm | 82% | 1.7 m/s | 5 |
| 1996 | 16.9°C | 11.4°C | 5.9°C | 23.0°C | 0.8°C | 71 mm | 83% | 1.8 m/s | 4.9 |
| 1995 🌧️ | 14.7°C | 10.1°C | 5.5°C | 20.9°C | 0.5°C | 223 mm | 86% | 2.2 m/s | 4.1 |
| 1994 | 18.1°C | 12.0°C | 5.8°C | 24.2°C | 2.6°C | 9 mm | 79% | 1.6 m/s | 4.8 |
| 1993 | 17.6°C | 12.5°C | 7.3°C | 23.4°C | 3.7°C | 78 mm | 87% | 1.5 m/s | 4 |
| 1992 | 16.4°C | 11.8°C | 7.1°C | 20.5°C | 5.3°C | 85 mm | 86% | 1.6 m/s | 4.3 |
| 1991 | 13.6°C | 8.9°C | 4.2°C | 20.5°C | 0.1°C | 220 mm | 83% | 2.6 m/s | 4.2 |
| 1990 | 17.4°C | 11.5°C | 5.5°C | 22.6°C | 1.0°C | 32 mm | 80% | 1.9 m/s | 4.4 |
| 1989 | 15.5°C | 10.9°C | 6.3°C | 19.5°C | 0.5°C | 118 mm | 85% | 2.2 m/s | 4.1 |
| 1988 | 19.5°C | 12.2°C | 4.9°C | 25.4°C | -1.5°C | 1 mm | 71% | 2.2 m/s | 5.3 |
| 1987 | 16.2°C | 10.6°C | 5.0°C | 24.5°C | 1.4°C | 79 mm | 79% | 2.1 m/s | 4.7 |
| 1986 | 17.4°C | 12.3°C | 7.1°C | 23.4°C | 2.4°C | 151 mm | 85% | 1.9 m/s | 4.4 |
| 1985 | 14.5°C | 9.0°C | 3.6°C | 21.9°C | 0.6°C | 107 mm | 81% | 2.2 m/s | 4.7 |
| 1984 | 16.8°C | 11.2°C | 5.5°C | 21.0°C | 1.3°C | 38 mm | 81% | 2.1 m/s | 4.8 |
| 1983 | 14.1°C | 10.2°C | 6.4°C | 18.3°C | 2.7°C | 212 mm | 88% | 2.1 m/s | — |
| 1982 | 13.3°C | 8.8°C | 4.4°C | 18.0°C | -0.3°C | 192 mm | 86% | 2 m/s | — |
| 1981 | 15.5°C | 10.2°C | 5.0°C | 19.8°C | 1.2°C | 107 mm | 82% | 1.9 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 16.3°C with lows near 5.6°C (mean 11°C), based on 45 years of NASA POWER data.
March averages 87 mm of rainfall in Sunnyvale, a relatively wet time of year. The wettest on record was 223 mm in 1995.
The hottest March reached 28.5°C in 2007. The coldest dipped to -1.5°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 0.6°C. Daytime highs moved from 14.8°C to 15.7°C and overnight lows from 5°C to 5.3°C over the same span.
March is one of the cooler months of the year in Sunnyvale and a relatively wet time of year, so plan for around 16.3°C daytime highs and 5.6°C at night.
Not quite — March is the 4th coolest month in Sunnyvale, averaging 11°C.
For March in Sunnyvale, pack warm layers and a jacket for chilly mornings, with typical highs of 16.3°C and lows of 5.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 83% — quite humid.
Average wind speed in March is 1.9 m/s. The windiest March on record averaged 2.6 m/s (1991).
The wettest March on record was 1995 with 223 mm. On average, March sees 87 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Sunnyvale behaves each March, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for March specifically, along with year-by-year records and how the month has changed over the decades.
