June is one of the warmer months of the year in Sunnyvale, with average highs near 26.8°C and lows around 10.4°C (mean 18.6°C). It is one of the drier months, averaging 4 mm of rainfall and 65% relative humidity across the period.
June is one of the warmer months of the year in Sunnyvale. Across 45 years of records, the warmest June in Sunnyvale was 1981 — when the month averaged 21.3°C — while the coldest was 1998 at 15.7°C. Typical June days reach 26.8°C with nights near 10.4°C. The long-term June temperature trend is broadly flat.
June is one of the drier months in Sunnyvale, averaging 4 mm of rainfall. The wettest June on record was 2011 with 43 mm, while the driest were 1986, 2007 and 2008, among others at 0 mm.
Relative humidity in Sunnyvale during June averages 65%. The most humid June was 1998 at 80%, and the least humid was 1981 at 52%.
June receives about 7.1 kWh/m²/day of solar energy in Sunnyvale. The sunniest June was 2001 at 8 kWh/m²/day, and the cloudiest was 1998 at 6.2.
Average wind speed in Sunnyvale during June is 2.7 m/s. The windiest June was 2004 at 3.2 m/s, while the calmest were 1986, 1995 and 1996 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.2°C | 18.0°C | 18.6°C | 18.5°C | 18.9°C | -0.3°C |
| Avg High | 27.9°C | 25.9°C | 26.7°C | 26.5°C | 27.0°C | -0.9°C |
| Avg Low | 10.4°C | 10.0°C | 10.5°C | 10.5°C | 10.8°C | +0.4°C |
| Avg Rain | 3 mm | 7 mm | 2 mm | 6 mm | 1 mm | -2 mm |
June temperatures in Sunnyvale have fallen by about 0.4°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 5.5°C (1995) to a record high of 41°C (2021).
Rainfall in June is one of the drier months, averaging 4 mm, with a wettest year of 43 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
One of the best times to visit Sunnyvale
June is one of the best times to visit Sunnyvale. Expect days averaging 26.8°C and nights around 10.4°C (mean 18.6°C) — warmer than Sunnyvale's yearly average — with low rainfall (4 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 26.0°C | 18.0°C | 9.9°C | 35.8°C | 7.6°C | 0 mm | 66% | 3 m/s | 7.1 |
| 2024 | 27.2°C | 18.9°C | 10.5°C | 36.6°C | 8.8°C | 0 mm | 65% | 3 m/s | 7.5 |
| 2023 | 23.2°C | 16.5°C | 9.9°C | 36.3°C | 7.6°C | 1 mm | 74% | 2.8 m/s | 6.3 |
| 2022 | 28.8°C | 20.1°C | 11.4°C | 39.5°C | 8.3°C | 2 mm | 59% | 2.8 m/s | 7.5 |
| 2021 | 28.0°C | 19.7°C | 11.4°C | 41.0°C | 8.0°C | 0 mm | 62% | 3.1 m/s | 7.4 |
| 2020 | 28.7°C | 20.1°C | 11.4°C | 36.9°C | 7.7°C | 1 mm | 60% | 2.9 m/s | 7.7 |
| 2019 | 26.7°C | 18.7°C | 10.8°C | 37.6°C | 7.3°C | 1 mm | 67% | 2.6 m/s | 7.3 |
| 2018 | 26.8°C | 18.6°C | 10.4°C | 37.5°C | 7.7°C | 0 mm | 66% | 3 m/s | 7.7 |
| 2017 | 26.2°C | 18.5°C | 10.9°C | 37.9°C | 7.4°C | 2 mm | 70% | 2.7 m/s | 7.3 |
| 2016 | 27.6°C | 19.1°C | 10.6°C | 36.2°C | 8.3°C | 0 mm | 64% | 2.7 m/s | 7.3 |
| 2015 | 27.5°C | 19.5°C | 11.5°C | 39.3°C | 9.2°C | 4 mm | 66% | 2.8 m/s | 6.8 |
| 2014 | 28.7°C | 19.7°C | 10.6°C | 39.7°C | 8.6°C | 1 mm | 60% | 2.9 m/s | 7.2 |
| 2013 | 28.4°C | 19.8°C | 11.2°C | 39.2°C | 8.3°C | 2 mm | 63% | 2.9 m/s | 7 |
| 2012 | 25.6°C | 17.5°C | 9.4°C | 38.8°C | 6.1°C | 4 mm | 64% | 3 m/s | 7.8 |
| 2011 🌧️ | 22.7°C | 16.2°C | 9.6°C | 35.8°C | 5.8°C | 43 mm | 75% | 2.6 m/s | 6.7 |
| 2010 | 24.4°C | 17.3°C | 10.2°C | 35.6°C | 7.2°C | 0 mm | 72% | 2.9 m/s | 7.4 |
| 2009 | 25.2°C | 18.0°C | 10.7°C | 40.1°C | 8.4°C | 2 mm | 69% | 2.6 m/s | 6.8 |
| 2008 | 28.9°C | 19.6°C | 10.3°C | 40.5°C | 6.7°C | 0 mm | 54% | 2.7 m/s | 7.5 |
| 2007 | 27.0°C | 18.5°C | 9.9°C | 38.9°C | 7.5°C | 0 mm | 63% | 2.8 m/s | 7.6 |
| 2006 | 27.0°C | 19.2°C | 11.3°C | 37.2°C | 8.8°C | 1 mm | 71% | 2.5 m/s | 6.9 |
| 2005 | 24.4°C | 17.0°C | 9.7°C | 32.6°C | 6.8°C | 10 mm | 71% | 2.7 m/s | 7.3 |
| 2004 | 26.0°C | 18.2°C | 10.4°C | 35.8°C | 8.6°C | 0 mm | 68% | 3.2 m/s | 7.3 |
| 2003 | 26.7°C | 18.8°C | 11.0°C | 39.0°C | 8.1°C | 0 mm | 67% | 2.7 m/s | 6.9 |
| 2002 | 25.6°C | 17.8°C | 10.0°C | 35.8°C | 8.2°C | 1 mm | 67% | 3 m/s | 7.1 |
| 2001 | 28.5°C | 19.5°C | 10.4°C | 37.7°C | 7.6°C | 2 mm | 59% | 2.9 m/s | 8 |
| 2000 | 28.0°C | 19.4°C | 10.8°C | 40.6°C | 7.3°C | 6 mm | 65% | 2.7 m/s | 6.6 |
| 1999 | 25.3°C | 17.3°C | 9.3°C | 38.1°C | 5.6°C | 5 mm | 68% | 2.8 m/s | 7.2 |
| 1998 ❄️ | 21.4°C | 15.7°C | 10.0°C | 29.6°C | 7.5°C | 4 mm | 80% | 2.5 m/s | 6.2 |
| 1997 | 26.8°C | 18.7°C | 10.7°C | 35.3°C | 7.7°C | 7 mm | 66% | 3 m/s | 7.6 |
| 1996 | 27.4°C | 18.8°C | 10.1°C | 38.2°C | 8.0°C | 1 mm | 66% | 2.4 m/s | 7.7 |
| 1995 | 23.8°C | 16.7°C | 9.6°C | 37.7°C | 5.5°C | 22 mm | 72% | 2.4 m/s | 7.1 |
| 1994 | 27.4°C | 18.4°C | 9.5°C | 37.3°C | 6.7°C | 1 mm | 61% | 2.6 m/s | 7.7 |
| 1993 | 27.1°C | 18.9°C | 10.7°C | 38.1°C | 7.6°C | 13 mm | 65% | 2.5 m/s | 7.7 |
| 1992 | 27.6°C | 19.3°C | 11.0°C | 35.3°C | 7.7°C | 9 mm | 65% | 2.6 m/s | 6.3 |
| 1991 | 25.8°C | 17.5°C | 9.2°C | 32.7°C | 6.5°C | 6 mm | 65% | 2.7 m/s | 6.5 |
| 1990 | 26.8°C | 18.3°C | 9.9°C | 36.3°C | 6.7°C | 0 mm | 67% | 2.7 m/s | 7.3 |
| 1989 | 27.8°C | 19.2°C | 10.7°C | 37.0°C | 8.4°C | 2 mm | 61% | 2.8 m/s | 6.6 |
| 1988 | 28.2°C | 19.3°C | 10.3°C | 36.8°C | 6.5°C | 8 mm | 62% | 2.7 m/s | 6.7 |
| 1987 | 29.5°C | 20.0°C | 10.4°C | 38.8°C | 8.3°C | 0 mm | 54% | 2.6 m/s | 6.3 |
| 1986 | 27.7°C | 19.1°C | 10.4°C | 35.6°C | 8.4°C | 0 mm | 62% | 2.4 m/s | 6.7 |
| 1985 | 30.8°C | 21.0°C | 11.3°C | 37.1°C | 5.6°C | 5 mm | 55% | 2.5 m/s | 6.7 |
| 1984 | 28.1°C | 18.9°C | 9.7°C | 34.8°C | 7.2°C | 5 mm | 59% | 2.8 m/s | 6.8 |
| 1983 | 24.1°C | 16.9°C | 9.7°C | 30.3°C | 7.8°C | 1 mm | 74% | 2.6 m/s | — |
| 1982 | 24.0°C | 16.7°C | 9.4°C | 32.1°C | 6.8°C | 7 mm | 71% | 2.6 m/s | — |
| 1981 🔥 | 30.8°C | 21.3°C | 11.7°C | 39.6°C | 7.3°C | 0 mm | 52% | 2.9 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 26.8°C with lows near 10.4°C (mean 18.6°C), based on 45 years of NASA POWER data.
June averages 4 mm of rainfall in Sunnyvale, one of the drier months. The wettest on record was 43 mm in 2011.
The hottest June reached 41°C in 2021. The coldest dipped to 5.5°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have fallen by about 0.4°C — but days and nights have moved in opposite directions. Overnight lows rose from 10.4°C to 10.6°C while daytime highs eased from 27.6°C to 26.6°C, narrowing the gap between day and night.
June is one of the warmer months of the year in Sunnyvale and one of the drier months, so plan for around 26.8°C daytime highs and 10.4°C at night.
Not quite — June is the 9th coolest month in Sunnyvale, averaging 18.6°C.
For June in Sunnyvale, pack light layers you can adjust through the day, with typical highs of 26.8°C and lows of 10.4°C.
Relative humidity in June averages 65% — moderately humid.
Average wind speed in June is 2.7 m/s. The windiest June on record averaged 3.2 m/s (2004).
The wettest June on record was 2011 with 43 mm. On average, June sees 4 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 June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
